| PATENT NUMBER | This data is not available for free |
| PATENT GRANT DATE | January 4, 2005 |
| PATENT TITLE |
Propylene polymer compositions |
| PATENT ABSTRACT | A propylene polymer composition comprising a propylene polymer prepared by using a zirconocene catalyst having two aryl-substituted indenyl group and having a melt flow rate (MFR) of 0.01 to 30 g/10 min and a second propylene polymer prepared by using a zirconocene catalyst having a melt flow rate (MFR) of 30 to 1,000 g/10 min and, if desired, a soft polymer, a ratio of the MFR of the second propylene polymer to the MFR of the second propylene polymer being not less than 30. These propylene polymer compositions are excellent in heat resistance, mechanical strength, tensile elongation at break, etc., and hence they can be favorably used for various structural materials such as those of automobile and electrical appliances, daily necessaries, various films and sheets |
| PATENT INVENTORS | This data is not available for free |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT FILE DATE | October 11, 2001 |
| PATENT FOREIGN APPLICATION PRIORITY DATA | This data is not available for free |
| PATENT REFERENCES CITED |
Yu, et al., Exxon Chemical Company, "Polyolefin Modification with EXACT.TM. Plastomers", SPE RETC Polyolefins VIII Conference, Houston Texas, pp 1-9 Feb. 1993.* G. Fink, R. Mulhaupt, H.H. Brintzinger, Ziegler Catalysts: Recent Scientific Innovations and Technological Improvements; 1995 pp. 36-43 and 45. G. Fink, R. Mulhaupt, H.H. Brintzinger, Ziegler Catalysts: Recent Scientific Innovations and Technological Improvements; 1995 pp. 377 and 384. |
| PATENT PARENT CASE TEXT | This data is not available for free |
| PATENT CLAIMS |
What is claimed: 1. A propylene polymer composition which is the product obtained by the steps comprising: polymerizing propylene in the presence of an olefin polymerization catalyst comprising (i)(a) a zirconocene compound represented by the following formula R.sup.1 R.sup.2 R.sup.3 R.sup.4 Zr wherein two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a substituted indenyl group substituted with aryl group, and linked together through a dimethylsilylene; and remaining two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a halogen atom, and (ii) at least one organoaluminum oxy-compound, to prepare a propylene polymer (A1) having a melt flow rate (MFR), as measured according to ASTM D-1238, at 230.degree. C. under a load of 2.16 kg, of 0.01 to 30 g/10 min.; and a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 3; polymerizing propylene in the presence of an olefin polymerization catalyst comprising (i) (a) a zirconocene compound represented by the following formula R.sup.1 R.sup.2 R.sup.3 R.sup.4 Zr wherein two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a substituted indenyl group substituted with aryl group, and linked together through a dimethylsilylene; and the remaining two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a halogen atom, and (ii) at least one organoaluminum oxy-compound, to prepare a propylene polymer (A2) having a melt flow rate (MFR), as measured according to ASTM D-1238, at 230.degree. C. under a load of 2.16 kg, of 30 to 1000 g/10 min.; and a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 4; wherein the ratio ((A2)/(A1)) of the MFR of said propylene polymer (A2) to the MFR of said propylene polymer (A1) is not less than 30; and mixing 10 to 90% by weight of the propylene polymer (A1) and 10 to 90% by weight of the propylene polymer (A2). 2. A propylene polymer composition which is the product obtained by a multi-stage polymerization method comprising the steps of: polymerizing propylene in the presence of an olefin polymerization catalyst comprising (i) (a) a zirconocene compound represented by the following formula R.sup.1 R.sup.2 R.sup.3 R.sup.4 Zr wherein two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a substituted indenyl group substituted with aryl group, and linked together through dimethylsilylene; and the remaining two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a halogen atom, and (ii) at least one organoaluminum oxy-compound, to prepare a propylene polymer (A1) having a melt flow rate (MFR), as measured according to ASTM D-1238, at 230.degree. C. under a load of 2.16 kg, of 0.01 to 30 g/10 min.; and a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 3; polymerizing propylene in the presence of an olefin polymerization catalyst comprising (i) (a) a zirconocene compound represented by the following formula R.sup.1 R.sup.2 R.sup.3 R.sup.4 Zr wherein two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a substituted indenyl group substituted with aryl group, and linked together through dimethylsilylene; and the remaining two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a halogen atom, and (ii) at least one organoaluminum oxy-compound, to prepare a propylene polymer (A2) having a melt flow rate (MFR), as measured according to ASTM D-1238, at 230.degree. C. under a load of 2.16 kg, of 30 to 1000 g/10 min.; and a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 4; wherein the ratio ((A2)/(A1)) of the MFR of said propylene polymer (A2) to the MFR of said propylene polymer (A1) is not less than 30; and wherein the steps of preparing the propylene polymers (A1) and (A2) are conducted in an arbitrary order; and the amount of the propylene polymer (A1) is 10 to 90% by weight, the amount of the propylene polymer (A2) is 10 to 90% by weight. 3. A propylene polymer composition which is the product obtained by the steps comprising: polymerizing propylene in the presence of an olefin polymerization catalyst comprising (d) a solid titanium catalyst compound, and (e) an organoaluminum compound catalyst component, to prepare a propylene polymer (A3) having a melt flow rate (MFR), as measured according to ASTM D-1238, at 230.degree. C. under a load of 2.16 kg, of 0.01 to 30 g/10 min.; and a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 4 to 15; polymerizing propylene in the presence of an olefin polymerization catalyst comprising (i) (a) a zirconocene compound represented by the following formula R.sup.1 R.sup.2 R.sup.3 R.sup.4 Zr wherein two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a substituted indenyl group substituted with aryl group, and linked together through dimethylsilylene and the remaining two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each a halogen atom, and (ii) at least one organoaluminum oxy-compound, to prepare a propylene polymer (A2) having a melt flow rate (MFR), as measured according to ASTM D-1238, at 230.degree. C. under a load of 2.16 kg, of 30 to 1000 g/10 min.; and a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 4; and mixing 10 to 90% by weight of a propylene polymer (A3) and 10 to 90% by weight of the propylene polymer (A2). 4. The propylene polymer composition as claimed in claim 1 or 2, which further comprises, blended therewith, 3 to 30 parts by weight, based on 100 parts by weight of total amount of propylene polymers (A1) and (A2), of a soft polymer (B) which is a (co)polymer of ethylene or an .alpha.-olefin of 3 to 20 carbon atoms, and having MFR, as measured at 190.degree. C. under a load of 2.16 kg, of 0.01 to 100 g/10 min., and a crystallinity, as measured by x-ray diffractometry, of less than 30%. 5. The propylene polymer composition as claimed in claim 3, which further comprises, blended therewith, 3 to 30 parts by weight, based on 100 parts by weight of total amount of propylene polymers (A3) and (A2), of a soft polymer (B) which is a (co)polymer of ethylene or an .alpha.-olefin of 3 to 20 carbon atoms, and having MFR, as measured at 190.degree. C. under a load of 2.16 kg, of 0.01 to 100 g/10 min., and a crystallinity, as measured by x-ray diffractometry, of less than 30%. 6. The propylene polymer composition according to claim 1 wherein the zirconocene compound (i)(a) used to prepare propylene polymer (A1) and propylene polymer (A2) is a compound represented by the formula (I): ##STR13## wherein M represents a zirconium atom; X.sup.1 and X.sup.2 each represent a halogen atom; R.sup.1 represents an alkyl group of from 2 to 6 carbon atoms; R.sup.2 represents an aryl group having from 6 to 16 carbon atoms; and Y represents dimethylsilylene. 7. The propylene polymer composition according to claim 2 wherein the zirconocene compound (i)(a) used to prepare propylene polymer (A1) and propylene polymer (A2) is a compound represented by the formula (I): ##STR14## wherein M represents a zirconium atom; X.sup.1 and X.sup.2 each represent a halogen atom; R.sup.1 represents an alkyl group of from 2 to 6 carbon atoms; R.sup.2 represents an aryl group having from 6 to 16 carbon atoms; and Y represents dimethylsilylene. 8. The propylene polymer composition according to claim 3 wherein the zirconocene compound (i)(a) is a compound represented by the formula (I): ##STR15## wherein M represents a zirconium atom; X.sup.1 and X.sup.2 each represent a halogen atom; R.sup.1 represents an alkyl group of from 2 to 6 carbon atoms; R.sup.2 represents an aryl group having from 6 to 16 carbon atoms; and Y represents dimethylsilylene. 9. The propylene polymer composition according to claim 1 wherein the zirconocene compound (i)(a) used to prepare propylene polymer (A1) and propylene polymer (A2) is rac-dimethylsilyl-bis(2-ethyl-4-phenylindenyl)zirconium dichloride. 10. The propylene polymer composition according to claim 2 wherein the zirconocene compound (i)(a) used to prepare propylene polymer (A1) and propylene polymer (A2) is rac-dimethylsilyl-bis(2-ethyl-4-phenylindenyl)zirconium dichloride. 11. The propylene polymer composition according to claim 3 wherein the zirconocene compound (i)(a) is rac-dimethylsilyl-bis(2-ethyl-4-phenylindenyl)zirconium dichloride. 12. A propylene polymer composition comprising a physical or chemical blended mixture of from 10 to 90% by weight of first propylene polymer (A1) and from 10 to 90% by weight of second propylene polymer (A2), wherein polymer (A1) has a melt flow rate (MFR), measured according to ASTM D-1238, at 230.degree. C., under a load of 2.16 kg, of 0.01 to 30 g/10 min; and a molecular weight distribution (Mw/Mn), measured by gel permeation chromatography (GPC), of 2 to 3; and wherein propylene polymer (A2) has a melt flow rate (MFR), measured according to ASTM D-1238, at 230.degree. C., under a load of 2.16 kg, of 30 to 1000 g/10 min; and a molecular weight distribution (Mw/Mn), measured by gel permeation chromatography (GPC), of 2 to 4; and wherein propylene polymer (A1) and propylene polymer (A2) are each obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising (i)(a) a zirconocene compound represented by the formula R.sup.1 R.sup.2 R.sup.3 R.sup.4 Zr wherein R.sup.1 and R.sup.2 each represent indenyl substituted with an alkyl group and an aryl group; R.sup.3 and R.sup.4 each represent a halogen atom; and wherein the two substituted indenyl groups are linked to each other through dimethylsilylene; and (ii) at least one organoaluminum oxy-compound; and wherein the ratio of the MFR of propylene polymer (A2) to the MFR of propylene polymer (A1) is not less than 30. 13. The propylene polymer composition according to claim 12 wherein propylene polymer (A1) has a crystallinity of not less than 40% and contains not more than 10 mole% of another olefin; and propylene polymer (A2) has a crystallinity of not less than 40% and contains not more than 5 mole% of another olefin. 14. The propylene polymer composition according to claim 13 wherein propylene polymer (A1) is a propylene homopolymer. 15. The propylene polymer composition according to claim 14 wherein propylene polymer (A2) is a propylene homopolymer. 16. The propylene polymer composition according to claim 13 wherein propylene polymer (A2) is a propylene homopolymer. 17. The propylene polymer composition according to claim 13 which comprises from 30 to 70% by weight of propylene polymer (A1) and from 30 to 70% by weight of propylene polymer (A2). -------------------------------------------------------------------------------- |
| PATENT DESCRIPTION |
FIELD OF THE INVENTION The present invention relates to propylene polymer compositions each comprising two kinds of propylene polymers and to propylene polymer compositions each comprising a propylene polymer and other olefin (co)polymer. BACKGROUND OF THE INVENTION Propylene polymers have been conventionally molded by various molding methods and the molded articles are applied to extensive uses. The propylene polymers are generally prepared using a catalyst comprising a transition metal compound and an organoaluminum compound, i.e., so-called Ziegler catalyst. Propylene polymers prepared by the use of a titanium catalyst containing a halogen-containing titanium catalyst component among the Ziegler catalysts are excellent in moldability and rigidity, but they have such problems that they are poor in tensile elongation at break. Moreover, the titanium catalyst causes a large amount of a catalyst residue in the resulting polymer because of low polymerization activities, and hence the molded article is sometimes colored or deteriorated in sanitariness. On the other hand, propylene polymers prepared by the use of a metallocene catalyst containing a transition metal compound catalyst component such as zirconocene are excellent in tensile elongation at break, but they have such problems that they are poor in moldability and rigidity (flexural modulus). As for the metallocene catalyst, however, the amount of the catalyst residue is small because of high polymerization activities, and the molded article is never colored and is good in sanitariness. Though the characteristics required for the propylene polymers vary depending on the molding methods or uses, generally required are moldability, heat resistance, mechanical strength, high tensile elongation at break, impact resistance, etc. For satisfying these requirements, researches on various compositions such as a composition obtained by blending two or more kinds of propylene polymers and a composition obtained by blending a propylene polymer and other synthetic resin have been made. For example, blending of two kinds of propylene polymers which are different in the molecular weight has been carried out in order to improve physical properties of the propylene polymers prepared by the use of a titanium catalyst. However, when two kinds of propylene polymers produced by the use of a titanium catalyst are blended to prepare a propylene polymer composition, the tensile elongation at break of the resulting composition is markedly lowered, though the moldability thereof is improved. Further, adding of a soft polymer to a propylene polymer which is prepared by the use of a titanium catalyst has been carried out in order to improve the tensile elongation at break and the impact resistance of the propylene polymer. The soft polymer used therefor is, for example, an ethylene/propylene random copolymer prepared by the use of a titanium catalyst or a vanadium catalyst. However, even if the propylene polymer prepared by the use of a titanium catalyst is blended with the ethylene/propylene random copolymer prepared by the use of a titanium catalyst or the like, the resulting composition is not sufficiently improved in the tensile elongation at break and the impact resistance. As described above, the conventional propylene polymer compositions are not always satisfactory in the properties such as heat resistance, mechanical strength and tensile elongation at break. OBJECT OF THE INVENTION The present invention has been accomplished in the light of the foregoing prior art technique, and an object of the present invention is to provide propylene polymer compositions which are excellent in heat resistance, mechanical strength, tensile elongation at break, etc. as compared with the conventional propylene polymers or propylene polymer compositions. SUMMARY OF THE INVENTION The first propylene polymer composition of the invention comprises: (A1) a propylene polymer, in an amount of 10 to 90% by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (a) a compound of a Group IVB transition metal in the periodic table containing a ligand having a cyclopentadienyl skeleton, and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (c) a compound which reacts with the transition metal compound (a) to form an ion pair, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 0.01 to 30 g/10 min, and (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 3; and (A2) a propylene polymer, in an amount of 10 to 90% by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (a) a compound of a Group IVB transition metal in the periodic table containing a ligand having a cyclopentadienyl skeleton, and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (c) a compound which reacts with the transition metal compound (a) to form an ion pair, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 30 to 1,000 g/10 min, and (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 4; a ratio ((A2)/(A1)) of the MFR of said propylene polymer (A2) to the MFR of said propylene polymer (A1) being not less than 30. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability. The second propylene polymer composition of the invention comprises: (A1) a propylene polymer, in an amount of 10 to 90 parts by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (a) a compound of a Group IVB transition metal in the periodic table containing a ligand having a cyclopentadienyl skeleton, and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (c) a compound which reacts with the transition metal compound (a) to form an ion pair, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 0.01 to 30 g/10 min, and (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 3; (A2) a propylene polymer, in an amount of 10 to 90 parts by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (a) a compound of a Group IVB transition metal in the periodic table containing a ligand having a cyclopentadienyl skeleton, and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (c) a compound which reacts with the transition metal compound (a) to form an ion pair, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 30 to 1,000 g/10 min, and (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 4; and (B) a soft polymer in an amount of 3 to 30 parts by weight; a ratio ((A2)/(A1)) of the MFR of said propylene polymer (A2) to the MFR of said propylene polymer (A1) being not less than 30. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability and impact resistance. The third propylene polymer composition of the invention comprises: (A3) a propylene polymer, in an amount of 10 to 90% by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (d) a solid titanium catalyst component, and (e) an organometallic compound catalyst component, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 0.01 to 30 g/10 min, and (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 4 to 15; and (A2) a propylene polymer, in an amount of 90 to 10% by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (a) a compound of a Group IVB transition metal in the periodic table containing a ligand having a cyclopentadienyl skeleton, and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (c) a compound which reacts with the transition metal compound (a) to form an ion pair, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 30 to 1,000 g/10 min, and (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 4. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability. The fourth propylene polymer composition of the invention comprises: (A3) a propylene polymer, in an amount of 10 to 90 parts by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (d) a solid titanium catalyst component, and (e) an organometallic compound catalyst component, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 0.01 to 30 g/10 min, and (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 4 to 15; (A2) a propylene polymer, in an amount of 90 to 10 parts by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (a) a compound of a Group IVB transition metal in the periodic table containing a ligand having a cyclopentadienyl skeleton, and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (c) a compound which reacts with the transition metal compound (a) to form an ion pair, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 30 to 1,000 g/10 min, and (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 2 to 4; and (B) a soft polymer in an amount of 3 to 30 parts by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability and impact resistance. The fifth propylene polymer composition of the invention comprises: (A4) a propylene polymer, in an amount of 50 to 97% by weight, which is characterized in that: (1) the propylene polymer is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (d) a solid titanium catalyst component, and (e) an organometallic compound catalyst component, (2) the propylene polymer has a melt flow rate (MFR), as measured at 230.degree. C. under a load of 2.16 kg, of 0.01 to 50 g/10 min, (3) the propylene polymer has a molecular weight distribution (Mw/Mn), as measured by gel permeation chromatography (GPC), of 4 to 15, and (4) the propylene polymer has a crystallinity, as measured by X-ray diffractometry, of not less than 50%; and (C) an ethylene/olefin random copolymer, in an amount of 3 to 50% by weight, which is characterized in that: (1) the copolymer is obtained by copolymerizing ethylene and at least one monomer selected from .alpha.-olefins of 3 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms in the presence of an olefin polymerization catalyst comprising: (i) (f) a compound of a Group IVB transition metal in the periodic table containing a ligand having a cyclopentadienyl skeleton, (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (g) a compound which reacts with the transition metal compound (f) to form an ion pair, (2) the copolymer contains constituent units derived from ethylene in an amount of 20 to 80% by mol, and (3) the copolymer has an intrinsic viscosity [.eta.], as measured in decalin at 135.degree. C., of 1.5 to 5 dl/g. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also impact resistance, particularly low-temperature impact resistance. The sixth propylene polymer composition of the invention comprises: (A5) a propylene homopolymer, in an amount of 5 to 95% by weight, which is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the following formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair; and (A6) a propylene polymer, in an amount of 5 to 95% by weight, which contains constituent units derived from propylene in an amount of not less than 90% by mol and is different from the propylene homopolymer (A5); ##STR1## wherein M is a transition metal of Group IVa, Group Va or Group VIa of the periodic table; R.sup.1 is a hydrocarbon group of 2 to 6 carbon atoms; R.sup.2 is an aryl group of 6 to 16 carbon atoms which may be substituted with a halogen atom or a hydrocarbon group of 1 to 20 carbon atoms; X.sup.1 and X.sup.2 are each a hydrogen atom, a halogen atom, a hydrocarbon group of 1 to 20 carbon atoms, a halogenated hydrocarbon group of 1 to 20 carbon atoms, an oxygen-containing group or a sulfur-containing group; Y is a divalent hydrocarbon group of 1 to 20 carbon atoms, a divalent halogenated hydrocarbon group of 1 to 20 carbon atoms, a divalent silicon-containing group, a divalent germanium-containing group, a divalent tin-containing group, --O--, --CO--, --S--, --SO--, --SO.sub.2 --, --NR.sup.3 --, --P(R.sup.3)--, --P(O)(R.sup.3)--, --BR.sup.3 -- or --AlR.sup.3 --(R.sup.3 is a hydrogen atom, a halogen atom, a hydrocarbon group of 1 to 20 carbon atoms or a halogenated hydrocarbon group of 1 to 20 carbon atoms). Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability. The seventh propylene polymer composition of the invention comprises: (A5) a propylene homopolymer, in an amount of 5 to 95% by weight, which is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair; and (D) an olefin elastomer, in an amount of 5 to 95% by weight, which is characterized in that: (1) the elastomer is a polymer or copolymer of at least one monomer selected from olefins of 2 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms, (2) the elastomer contains constituent units derived from ethylene, propylene, butene or 4-methyl-1-pentene in an amount of less than 90% by mol, and (3) the elastomer has a glass transition temperature (Tg) of not higher than 10.degree. C. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also impact resistance. The eighth propylene polymer composition of the invention comprises: (A5) a propylene homopolymer, in an amount of 5 to 95% by weight, which is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair; and (E) an olefin polymer, in an amount of 5 to 95% by weight, which contains constituent units derived from one monomer selected from the group consisting of ethylene, butene and 4-methyl-1-pentene in an amount of not less than 90% by mol. Such propylene polymer composition is excellent in heat resistance, rigidity and tensile elongation at break. The ninth propylene polymer composition of the invention comprises: (A5) a propylene homopolymer which is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair; (A6) a propylene polymer which contains constituent units derived from propylene in an amount of not less than 90% by mol and is different from the propylene homopolymer (A5); and (D) an olefin elastomer which is characterized in that: (1) the elastomer is a polymer or copolymer of at least one monomer selected from olefins of 2 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms, (2) the elastomer contains constituent units derived from ethylene, propylene, butene or 4-methyl-1-pentene in an amount of less than 90% by mol, and (3) the elastomer has a glass transition temperature (Tg) of not higher than 10.degree. C.; said propylene polymer composition containing the propylene homopolymer (A5) in an amount of 5 to 95% by weight, the propylene polymer (A6) in an amount of not more than 95% by weight and the olefin elastomer (D) in an amount of not more than 95% by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability and impact resistance. The tenth propylene polymer composition of the invention comprises: (A5) a propylene homopolymer which is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair; (A6) a propylene polymer which contains constituent units derived from propylene in an amount of not less than 90% by mol and is different from the propylene homopolymer (A5); and (E) an olefin polymer which contains constituent units derived from one monomer selected from the group consisting of ethylene, butene and 4-methyl-1-pentene in an amount of not less than 90% by mol; said propylene polymer composition containing the 20 propylene homopolymer (A5) in an amount of 5 to 95% by weight, the propylene polymer (A6) in an amount of not more than 95% by weight and the olefin polymer (E) in an amount of not more than 95% by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability. The eleventh propylene polymer composition of the invention comprises: (A5) a propylene homopolymer which is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair; (D) an olefin elastomer which is characterized in that: (1) the elastomer is a polymer or copolymer of at least one monomer selected from olefins of 2 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms, (2) the elastomer contains constituent units derived from ethylene, propylene, butene or 4-methyl-1-pentene in an amount of less than 90% by mol, and (3) the elastomer has a glass transition temperature (Tg) of not higher than 10.degree. C.; and (E) an olefin polymer which contains constituent units derived from one monomer selected from the group consisting of ethylene, butene and 4-methyl-1-pentene in an amount of not less than 90% by mol; said propylene polymer composition containing the propylene homopolymer (A5) in an amount of 5 to 95% by weight, the olefin elastomer (D) in an amount of not more than 95% by weight and the olefin polymer (E) in an amount of not more than 95% by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also impact resistance. The twelfth propylene polymer composition of the invention comprises: (A5) a propylene homopolymer which is obtained by polymerizing propylene in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair; (A6) a propylene polymer which contains constituent units derived from propylene in an amount of not less than 90% by mol and is different from the propylene homopolymer (A5); (D) an olefin elastomer which is characterized in that: (1) the elastomer is a polymer or copolymer of at least one monomer selected from olefins of 2 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms, (2) the elastomer contains constituent units derived from ethylene, propylene, butene or 4-methyl-1-pentene in an amount of less than 90% by mol, and (3) the elastomer has a glass transition temperature (Tg) of not higher than 10.degree. C.; and (E) an olefin polymer which contains constituent units derived from one monomer selected from the group consisting of ethylene, butene and 4-methyl-1-pentene in an amount of not less than 90% by mol; said propylene polymer composition containing the propylene homopolymer (A5) in an amount of 5 to 95% by weight, the propylene polymer (A6) in an amount of not more than 95% by weight, the olefin elastomer (D) in an amount of not more than 95% by weight and the olefin polymer (E) in an amount of not more than 95% by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability and impact resistance. The thirteenth propylene polymer composition of the invention comprises: (A7) a propylene copolymer, in an amount of 5 to 95% by weight, which is characterized in that: (1) the propylene copolymer is obtained by copolymerizing propylene and at least one .alpha.-olefin selected from ethylene and .alpha.-olefins of 4 to 20 carbon atoms in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair, and (2) the propylene copolymer contains constituent units derived from propylene in an amount of not less than 90% by mol; and (A6) a propylene polymer, in an amount of 5 to 95% by weight, which contains constituent units derived from propylene in an amount of not less than 90% by mol and is different from the propylene copolymer (A7). Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability. The fourteenth propylene polymer composition of the invention comprises: (A7) a propylene copolymer, in an amount of 5 to 95% by weight, which is characterized in that: (1) the propylene copolymer is obtained by copolymerizing propylene and at least one .alpha.-olefin selected from ethylene and .alpha.-olefins of 4 to 20 carbon atoms in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair, and (2) the propylene copolymer contains constituent units derived from propylene in an amount of not less than 90% by mol; and (D) an olefin elastomer, in an amount of 5 to 95% by weight, which is characterized in that: (1) the elastomer is a polymer or copolymer of at least one monomer selected from olefins of 2 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms, (2) the elastomer contains constituent units derived from ethylene, propylene, butene or 4-methyl-1-pentene in an amount of less than 90% by mol, and (3) the elastomer has a glass transition temperature (Tg) of not higher than 10.degree. C. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also impact resistance. The fifteenth propylene polymer composition of the invention comprises: (A7) a propylene copolymer, in an amount of 5 to 95% by weight, which is characterized in that: (1) the propylene copolymer is obtained by copolymerizing propylene and at least one .alpha.-olefin selected from ethylene and .alpha.-olefins of 4 to 20 carbon atoms in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair, and (2) the propylene copolymer contains constituent units derived from propylene in an amount of not less than 90% by mol; and (E) an olefin polymer, in an amount of 5 to 95% by weight, which contains constituent units derived from one monomer selected from the group consisting of ethylene, butene and 4-methyl-1-pentene in an amount of not less than 90% by mol. Such propylene polymer composition is excellent in heat resistance, rigidity and tensile elongation at break. The sixteenth propylene polymer composition of the invention comprises: (A7) a propylene copolymer which is characterized in that: (1) the propylene copolymer is obtained by copolymerizing propylene and at least one .alpha.-olefin selected from ethylene and .alpha.-olefins of 4 to 20 carbon atoms in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair, and (2) the propylene copolymer contains constituent units derived from propylene in an amount of not less than 90% by mol; (A6) a propylene polymer which contains constituent units derived from propylene in an amount of not less than 90% by mol and is different from the propylene copolymer (A7); and (D) an olefin elastomer which is characterized in that: (1) the elastomer is a polymer or copolymer of at least one monomer selected from olefins of 2 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms, (2) the elastomer contains constituent units derived from ethylene, propylene, butene or 4-methyl-1-pentene in an amount of less than 90% by mol, and (3) the elastomer has a glass transition temperature (Tg) of not higher than 10.degree. C.; said propylene polymer composition containing the propylene copolymer (A7) in an amount of 5 to 95% by weight, the propylene polymer (A6) in an amount of not more than 95% by weight and the olefin elastomer (D) in an amount of not more than 95% by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability and impact resistance. The seventeenth propylene polymer composition of the invention comprises: (A7) a propylene copolymer which is characterized in that: (1) the propylene copolymer is obtained by copolymerizing propylene and at least one .alpha.-olefin selected from ethylene and .alpha.-olefins of 4 to 20 carbon atoms in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair, and (2) the propylene copolymer contains constituent units derived from propylene in an amount of not less than 90% by mol; (A6) a propylene polymer which contains constituent units derived from propylene in an amount of not less than 90% by mol and is different from the propylene copolymer (A7); and (E) an olefin polymer which contains constituent units derived from one monomer selected from the group consisting of ethylene, butene and 4-methyl-1-pentene in an amount of not less than 90% by mol; said propylene polymer composition containing the propylene copolymer (A7) in an amount of 5 to 95% by weight, the propylene polymer (A6) in an amount of not more than 95% by weight and the olefin polymer (E) in an amount of not more than 95% by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability. The eighteenth propylene polymer composition of the invention comprises: (A7) a propylene copolymer which is characterized in that: (1) the propylene copolymer is obtained by copolymerizing propylene and at least one .alpha.-olefin selected from ethylene and .alpha.-olefins of 4 to 20 carbon atoms in the presence of olefins polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair, and (2) the propylene copolymer contains constituent units derived from propylene in an amount of not less than 90% by mol; (D) an olefin elastomer which is characterized in that: (1) the elastomer is a polymer or copolymer of at least one monomer selected from olefins of 2 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms, (2) the elastomer contains constituent units derived from ethylene, propylene, butene or 4-methyl-1-pentene in an amount of less than 90% by mol, and (3) the elastomer has a glass transition temperature (Tg) of not higher than 10.degree. C.; and (E) an olefin polymer which contains constituent units derived from one monomer selected from the group consisting of ethylene, butene and 4-methyl-1-pentene in an amount of not less than 90% by mol; said propylene polymer composition containing the propylene copolymer (A7) in an amount of 5 to 95% by weight, the olefin elastomer (D) in an amount of not more than 95% by weight and the olefin polymer (E) in an amount of not more than 95% by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also impact resistance. The nineteenth propylene polymer composition of the invention comprises: (A7) a propylene copolymer which is characterized in that: (1) the propylene copolymer is obtained by copolymerizing propylene and at least one .alpha.-olefin selected from ethylene and .alpha.-olefins of 4 to 20 carbon atoms in the presence of an olefin polymerization catalyst comprising: (i) (h) a transition metal compound represented by the above formula (I), and (ii) at least one compound selected from the group consisting of (b) an organoaluminum oxy-compound, and (i) a compound which reacts with the transition metal compound (h) to form an ion pair, and (2) the propylene copolymer contains constituent units derived from propylene in an amount of not less than 90% by mol; (A6) a propylene polymer which contains constituent units derived from propylene in an amount of not less than 90% by mol and is different from the propylene copolymer (A7); (D) an olefin elastomer which is characterized in that: (1) the elastomer is a polymer or copolymer of at least one monomer selected from olefins of 2 to 20 carbon atoms and polyenes of 5 to 20 carbon atoms, (2) the elastomer contains constituent units derived from ethylene, propylene, butene or 4-methyl-1-pentene in an amount of less than 90% by mol, and (3) the elastomer has a glass transition temperature (Tg) of not higher than 10.degree. C.; and (E) an olefin polymer which contains constituent units derived from one monomer selected from the group consisting of ethylene, butene and 4-methyl-1-pentene in an amount of not less than 90% by mol; said propylene polymer composition containing the propylene copolymer (A7) in an amount of 5 to 95% by weight, the propylene polymer (A6) in an amount of not more than 95% by weight, the olefin elastomer (D) in an amount of not more than 95% by weight and the olefin polymer (E) in an amount of not more than 95% by weight. Such propylene polymer composition is excellent in not only heat resistance, rigidity and tensile elongation at break but also moldability and impact resistance. |
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