| PATENT NUMBER | This data is not available for free |
| PATENT GRANT DATE | September 28, 1999 |
| PATENT TITLE |
Processes for producing propylene polymer utilizing bis (1-(4-isopropyl-7-methyl-indenyl) zirconium halide-base catalyst components |
| PATENT ABSTRACT | A process for producing a propylene polymer having an intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., of 1 to 12 dl/g comprises polymerizing propylene optionally with other olefins in the presence of an olefin polymerization catalyst comprising a transition metal compound represented by the formula ##STR1## wherein R.sup.1 and R.sup.2 are each a hydrogen atom or a hydrocarbon group of 1 to 3 carbon atoms, X.sup.1 and X.sup.2 are each a halogen atom, and Y is a divalent silicon-containing group |
| PATENT INVENTORS | This data is not available for free |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT FILE DATE | April 21, 1997 |
| PATENT FOREIGN APPLICATION PRIORITY DATA | This data is not available for free |
| PATENT REFERENCES CITED |
Rubber Chemistry and Technology, pp. 781-804 (1971). Macromolecules, vol. 8, No. 5, pp. 687-689, Sep.-Oct. (1975). Makromol. Chem., Rapid Commun. 8, pp. 305-310 (1987). Journal of Molecular Catalysis, 56, pp. 237-247 (1989). Polymer, vol. 30, pp. 1350-1356, Jul. (1989). Polymer Preprints, Japan, vol. 39, No. 6, (1990) (No English Translation). Angewandte Chemie, Internat'l Ed., vol. 31, No. 10, Oct. 1992, Weinheim DE, XP000319626, W. Spaleck "High Molecular Weight . . . Zirconocene Catalysts" J Applied Polymer Science: Applied Polymer Symposium 52, pp. 159-172 (1993). W. Kaminsky, "Metallocene Catalysts", sp '92-PE World Congress, Dec. 1992. |
| PATENT PARENT CASE TEXT | This data is not available for free |
| PATENT CLAIMS |
What is claimed is: 1. A process for producing a propylene polymer having an intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., of 1 to 12 dl/g, said process comprising polymerizing propylene optionally together with other olefins in the presence of an olefin polymerization catalyst comprising a transition metal compound represented by the following formula: ##STR15## wherein R.sup.1 and R.sup.2 are each a hydrogen atom or a hydrocarbon group of 1 to 3 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom; and Y is a divalent silicon-containing group. 2. The process for producing the propylene polymer as claimed in claim 1, wherein X.sup.1 and X.sup.2 are each a chlorine atom. 3. A process for producing a propylene polymer having an intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., of 1 to 12 dl/g, said process comprising polymerizing propylene optionally together with other olefins in the presence of an olefin polymerization catalyst comprising a transition metal compound, wherein the transition metal compound is rac-dimethylsilylene-bis(1-(2,7-dimethyl-4-isopropylindenyl))zirconium dichloride, or rac-diphenylsilylene-bis)1 -(2,7-dimethyl-4-isopropylindenyl))zirconium dichloride. 4. A process for producing a propylene polymer having such properties that: (a) a triad tacticity of three propylene units-chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 90.0%; (b) a proportion of inversely inserted units based on the 2,1-insertion of a propylene monomer in all propylene insertions as measured by .sup.13 C-NMR, is not less than 0.7%, and a proportion of inversely inserted units based on 1,3-insertion of a propylene monomer, as measured by .sup.13 C-NMR, is not more than 0.05%; and (c) an intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., of 1 to 12 dl/g; the process comprising: polymerizing propylene optionally together with ethylene in the presence of an olefin polymerization catalyst comprising: (A) a transition metal compound represented by the formula: ##STR16## wherein R.sup.1 is a hydrogen atom or a hydrocarbon group of 1 to 3 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom; and Y is a divalent silicon-containing group selected from the group consisting of dimethylsilylene, diphenylsilylene and methylphenylsilylene; and (B) at least one compound selected from the group consisting of: (B-1) an organoaluminum oxy-compound, and (B-2) a compound which reacts with the transition metal compound to form an ion pair and which is selected from the group consisting of: (i) a boron-containing Lewis acid, (ii) a salt of an ammonium or phosphonium cation and a boron-containing anion, (iii) a borane compound, and (iv) a carborane compound, wherein the organoaluminum oxy-compound is contained at an atomic ratio (Al/M) of aluminum in the component (B-1) to the transition metal in the component (A) of 10 to 10,000 or the compound (B-2) is contained at a component (A)/component (B-2) molar ratio of 0.10 to 10. 5. The process for producing the propylene polymer as claimed in claim 4, wherein X.sup.1 and X.sup.2 are each a chlorine atom. 6. A process for producing a propylene polymer having such properties that: (a) a triad tacticity of three propylene units-chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 90.0%; (b) a proportion of inversely inserted units based on the 2,1-insertion of a propylene monomer in all propylene insertions as measured by .sup.13 C-NMR, is not less than 0.7%, and a proportion of inversely inserted units based on 1,3-insertion of a propylene monomer, as measured by .sup.13 C-NMR, is not more than 0.05%; and (c) an intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., of 1 to 12 dl/g; the process comprising: polymerizing propylene optionally together with ethylene in the presence of an olefin polymerization catalyst comprising: (A) a transition metal compound which is rac-dimethylsilylene-bis(1-(2,7-dimethyl-4-isopropylindenyl))zirconium dichloride, or rac-diphenylsilylene-bis(1-(2,7-dimethyl-4-isopropylindenyl))zirconium dichloride; and (B) at least one compound selected from the group consisting of: (B-1) an organoaluminum oxy-compound, and (B-2) a compound which reacts with the transition metal compound to form an ion pair and which is selected from the group consisting of: (i) a boron-containing Lewis acid, (ii) a salt of an ammonium or phosphonium cation and a boron-containing anion, (iii) a borane compound, and (iv) a carborane compound, wherein the organoaluminum oxy-compound is contained at an atomic ratio (Al/M) of aluminum in the component (B-1) to the transition metal in the component (A) of 10 to 10,000 or the compound (B-2) is contained at a component (A)/component (B-2) molar ratio of 0.10 to 10. 7. A process for producing a propylene polymer having such properties that: (a) a triad tactility of three propylene units-chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 90.0%; (b) a proportion of inversely inserted units based on the 2,1-insertion of a propylene nonomer in all propylene insertions as measured by .sup.13 C-NMR, is not less than 0.7%, and a proportion of inversely inserted units based on 1,3-insertion of a propylene monomer, as measured by .sup.13 C-NMR, is not more than 0.05%; and (c) an intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., of 1 to 12 dl/g; the process comprising: polymerizing propylene optionally together with ethylene in the presence of an olefin polymerization catalyst comprising: (A) a transition metal compound represented by the formula: ##STR17## wherein R.sup.1 is a hydrogen atom or a hydrocarbon group of 1 to 3 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom; and Y is a divalent silicon-containing group selected from the group consisting of dimethylsilylene, diphenylsilylene and methylphenylsilylene; (B) at least one compound selected from the group consisting of: (B-1) an organoaluminum oxy-compound, and (B-2) a compound which reacts with the transition metal compound to form an ion pair and which is selected from the group consisting of: (i) a boron-containing Lewis acid, (ii) a salt of an ammonium or phosphonium cation and a boron-containing anion, (iii) a borane compound, and (iv) a carborane compound; and (C) an organoaluminum compound of the formula: R.sup.9.sub.n AlX.sub.3-n wherein R.sup.9 is a hydrogen group of 1 to 12 carbon atoms, X is a halogen or hydrogen atom, and n is 1 to 3; wherein the organoaluminum oxy-compound is contained at an atomic ratio (Al/M) of aluminum in the component (B-1) to the transition metal in the component (A) of 10 to 10,000 or the compound (B-2) is contained at a component (A)/component (B-2) molar ratio of 0.10 to 10, and the organoaluminum compound (C) is contained at an atomic ratio (Al.sub.c /Al.sub.B-1) of aluminum atom (Al.sub.c) in the component (C) to aluminum atom (Al.sub.B-1) of the component (B-1) of 0.02 to 20. 8. The process for producing the propylene polymer as claimed in claim 7, wherein X.sup.1 and X.sup.2 are each a chlorine atom. 9. A process for producing a propylene polymer having such properties that: (a) a triad tacticity of three propylene units-chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 90%; (b) a proportion of inversely inserted units based on the 2,1-insertion of a propylene monomer in all propylene insertions as measured by 1.sup.3 C-NMR, is not less than 0.7%, and a proportion of inversely inserted units based on 1,3-insertion of a propylene monomer, as measured by .sup.13 C-NMR, is not more than 0.05%; and (c) an intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., of 1 to 12 dl/g; the process comprising: polymerizing propylene optionally together with ethylene in the presence of an olefin polymerization catalyst comprising: (A) a transition metal compound which is rac-dimethylsilylene-bis(1-(2,7-dimethyl-4-isopropyl-indenyl))zirconium dichloride, or rac-diphenylsilylene-bis(1-(2,7-dimethyl-4-isopropyl-indenyl))zirconium dichloride; (B) at least one compound selected from the group consisting of: (B-1) an organoaluminum oxy-compound, and (B-2) a compound which reacts with the transition metal compound to form an ion pair and which is selected from the group consisting of: (i) a boron-containing Lewis acid, (ii) a salt of an ammonium or phosphonium cation and a boron-containing anion, (iii) a borane compound, and (iv) a carborane compound; and (C) an organoaluminum compound of the formula: R.sup.9.sub.n AlX3.sub.3-n wherein R.sup.9 is a hydrogen group of 1 to 12 carbon atoms, X is a halogen or hydrogen atom, and n is 1 to 3; wherein the organoaluminum oxy-compound is contained at an atomic ratio (Al/M) of aluminum in the component (B-1) to the transition metal in the component (A) of 10 to 10,000 or the compound (B-2) is contained at a component (A)/component (B-2) molar ratio of 0.10 to 10, and the organoaluminum compound (C) is contained at an atomic ratio (Al.sub.c /Al.sub.B-1) of aluminum atom (Al.sub.c) in the component (C) to aluminum atom (Al.sub.B-1) of the component (B-1) of 0.02 to 20. -------------------------------------------------------------------------------- |
| PATENT DESCRIPTION |
FIELD OF THE INVENTION The present invention relates to a novel transition metal compound, an olefin polymerization catalyst component comprising the transition metal compound, an olefin polymerization catalyst containing the catalyst component and a process for olefin polymerization using the olefin polymerization catalyst. The invention also relates to a propylene polymer, a propylene copolymer and a propylene elastomer, all having a high triad tacticity of the propylene unit chain. BACKGROUND OF THE INVENTION A well known homogeneous catalyst is, for example, so-called Kaminsky catalyst. Use of this Kaminsky catalyst produces a polymer having an extremely high polymerization activity and a narrow molecular weight distribution. Of the Kaminsky catalysts, ethylenebis(indenyl)zirconium dichloride and ethylenebis(4,5,6,7-tetrahydroindenyl)zirconium dichloride are known as transition metal compounds for preparing isotactic polyolefins, as described in Japanese Patent Laid-Open Publication No. 130314/1986. However, polyolefins prepared by the use of these catalysts generally have a low stereoregularity and a low molecular weight. As a process for preparing polyolefins of high stereoregularity and high molecular weight using these catalyst, there is a process in which the polymerization is conducted at a low temperature, but this process has a problem of low polymerization activity. It is known that use of hafnium compounds in place of the zirconium compounds makes it possible to prepare a polymer having high molecular weight, as described in "Journal of Molecular Catalysis", 56 (1989), pp. 237-247, but this process also has a problem of low polymerization activity. Further, dimethylsilyl bissubstituted cyclopentadienyl zirconium dichloride is also known as described in Japanese Patent Laid-Open Publication No. 301704/1989 and "Polymer Preprints", Japan, vol. 39, No. 6, pp. 1,614-1,616 (1990), but this compound is not satisfactory in all of polymerization activity, and stereoregularity and molecular weight of polymers obtained. In order to solve these problems, various proposals have been made. For example, Japanese Patent Laid-Open Publication 268307/1993 describes an olefin polymerization catalyst formed from a metallocene compound represented by the following formula and aluminoxane as a catalyst capable of preparing a high molecular polyolefin, but the molecular weight of the resultant polyolefin is still insufficient. ##STR2## Further, EP 0 530 648 A1 describes an olefin polymerization catalyst formed from a metallocene compound represented by the following formula and aluminoxane. ##STR3## wherein A is a lower alkyl group. The molecular weight of the polyolefin obtained by the use of this catalyst is high and industrially satisfactory. In addition, since the melting point of the polyolefin (e.g., polypropylene) having high stereoregularity becomes high, the catalyst is suitably used for preparing a stereoregular polyolefin having a high melting point. However, it is unsuitable for preparing a stereoregular polyolefin (particularly a copolymer) having a high molecular weight and a low melting point, and the resultant polyolefin or copolymer is not satisfactory in its quality. Furthermore, EP 0 537 686 describes an olefin polymerization catalyst formed from a metallocene compound represented by the following formula and aluminoxane. ##STR4## wherein R.sup.1 and R.sup.2 are each a methyl group or hydrogen, X is Si(CH.sub.3).sub.2 group or an ethylene group. However, a polyolefin obtained by the use of this catalyst is low in the molecular weight and cannot be practically used. Under such circumstances as mentioned above, an olefin polymerization catalyst and a process for olefin polymerization, both having high olefin polymerization activity and being capable of preparing a polyolefin of excellent properties, are desired. Further, also desired are an olefin polymerization catalyst component used for such catalyst and a novel transition metal compound capable of forming the olefin polymerization catalyst component. In the light of the existing circumstances, the present inventors have earnestly studied, and as a result, they have found that the above requirements are satisfied by a transition metal compound which has two indenyl groups having a specific substituent group, said two indenyl groups being linked by way of a hydrocarbon group, a silicon-containing group or the like. Propylene polymers have been applied to various uses because of their excellent mechanical properties and optical properties. For example, a propylene homopolymer is excellent in rigidity, surface hardness, heat resistance, glossiness and transparency, and hence it is used for various industrial parts, containers, films and nonwoven fabrics. A propylene/ethylene random copolymer containing a small amount of ethylene units is excellent in transparency, ridigity, surface hardness, heat resistance, heat-sealing properties, and hence it is used for films, containers, etc. A propylene elastomer is excellent in impact absorbing properties, heat resistance and heat-sealing properties, and hence it is singly used for films or used as a modifier of a thermoplastic resin. However, the conventional propylene polymer is not always sufficient in transparency, impact resistance, etc. for some uses, and therefore the advent of a propylene polymer excellent in rigidity, heat resistance, surface hardness, glossiness, transparency and impact strength is desired. The conventional propylene/ethylene random copolymer is not always sufficient in transparency, heat-sealing properties, anti-blocking properties, bleed resistance, impact strength, etc. for some uses, and therefore the advent of a propylene/ethylene random copolymer excellent in transparency, rigidity, surface harness, heat resistance and heat-sealing properties is desired. The conventional propylene elastomer is not always sufficient in heat-sealing properties, anti-blocking properties and heat resistance when used singly, and is not always sufficient in effect of improving impact resistance when used as a modifier. Therefore, a propylene elastomer excellent in impact resistance, heat resistance, transparency, heat-sealing properties, anti-blocking properties and effect of improving impact resistance is desired. In the light of such circumstances as described above, the present inventors have further studied, and as a result, they have found that a propylene homopolymer having a high triad tacticity, as measured by .sup.13 C-NMR, of the propylene chain consisting of head-to-tail bonds, a specific proportion of inversely inserted propylene units and a specific intrinsic viscosity is excellent in the above-mentioned properties. Further, they have also found that a propylene copolymer which contains a small amount of ethylene units and has a high triad tacticity, as measured by .sup.13 C-NMR, of the propylene chain consisting of head-to-tail bonds, a specific proportion of inversely inserted propylene units and a specific intrinsic viscosity is excellent in the above-mentioned properties. Furthermore, they have found that a propylene elastomer which contains a specific amount of ethylene units and has a high triad tacticity, as measured by .sup.13 C-NMR, of the propylene chain consisting of head-to-tail bonds, a specific proportion of inversely inserted propylene units and a specific intrinsic viscosity is excellent in the above-mentioned properties. Moreover, the present inventors have found that the propylene polymer, the propylene copolymer and the propylene elastomer can be prepared by the use of an olefin polymerization catalyst containing the aforesaid specific transition metal compound as a catalyst component. OBJECT OF THE INVENTION It is an object of the present invention to provide a novel transition metal compound useful for an olefin polymerization catalyst component having a high olefin polymerization activity and to provide an olefin polymerization catalyst component comprising said transition metal compound. It is another object of the invention to provide an olefin polymerization catalyst containing the above olefin polymerization catalyst component and to provide a process for olefin polymerization using said olefin polymerization catalyst. It is a further object of the invention to provide a propylene polymer having excellent properties. SUMMARY OF THE INVENTION The novel transition metal compound according to the invention is a transition metal compound represented by the following formula (I): ##STR5## wherein M is a transition metal of Group IVb, Group Vb and Group VIb of the periodic table; R.sup.1 and R.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, a silicon-containing group, an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group or a phosphorus-containing group; R.sup.3 is an alkyl group of 2 to 20 carbon atoms; R.sup.4 is an alkyl 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; and 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.5 --, --P(R.sup.5)--, --P(O)(R.sup.5)--, --BR.sup.5 -- or --AlR.sup.5 -- (R.sup.5 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). The olefin polymerization catalyst component according to the invention comprises a transition metal compound represented by the above formula (I). The first olefin polymerization catalyst according to the invention comprises: (A) a transition metal compound represented by the above formula (I); and (B) at least one compound selected from a group consisting of (B-1) an organoaluminum oxy-compound, and (B-2) an compound which reacts with the transition metal compound to form an ion pair. The second olefin polymerization catalyst according to the invention comprises: (A) a transition metal compound represented by the above formula (I); (B) at least one compound selected from a group consisting of (B-1) an organoaluminum oxy-compound, and (B-2) an compound which reacts with the transition metal compound to form an ion pair; and (C) an organoaluminum compound. The third olefin polymerization catalyst according to the invention comprises: a fine particle carrier; (A) a transition metal compound represented by the above formula (I); and (B) at least one compound selected from a group consisting of (B-1) an organoaluminum oxy-compound, and (B-2) an compound which reacts with the transition metal compound to form an ion pair; said transition metal compound (A) and said at least one compound (B) being supported on the fine particle carrier. The fourth olefin polymerization catalyst according to the invention comprises: a solid catalyst component comprising: a fine particle carrier, (A) a transition metal compound represented by the above formula (I), and (B) at least one compound selected from a group consisting of (B-1) an organoaluminum oxy-compound, and (B-2) an compound which reacts with the transition metal compound to form an ion pair, said transition metal compound (A) and said at least one compound (B) being supported on the fine particle carrier; and (C) an organoaluminum compound. The fifth olefin polymerization catalyst according to the invention comprises: a fine particle carrier; (A) a transition metal compound represented by the above formula (I); (B) at least one compound selected from a group consisting of (B-1) an organoaluminum oxy-compound, and (B-2) an compound which reacts with the transition metal compound to form an ion pair; and a prepolymerized olefin polymer produced by prepolymerization. The sixth olefin polymerization catalyst according to the invention comprises: a fine particle carrier; (A) a transition metal compound represented by the above formula (I); (B) at least one compound selected from a group consisting of (B-1) an organoaluminum oxy-compound, and (B-2) an compound which reacts with the transition metal compound to form an ion pair; (C) an organoaluminum compound; and a prepolymerized olefin polymer produced by prepolymerization. The process for olefin polymerization according to the invention comprises polymerizing or copolymerizing an olefin in the presence of any of the first to sixth olefin polymerization catalysts. The olefin polymerization catalysts according to the invention have high polymerization activity and an olefin polymer obtained by using the catalytsts has a narrow molecular weight distribution and a narrow composition distribution. When they are used for polymerizing an .alpha.-olefin of 3 or more carbon atoms, obtainable is a polymer having a lower melting point as compared with a polymer obtained by using a conventional metallocene catalyst when these polymers have similar molecular weights. Further, in the preparation of a copolymer elastomer containing ethylene or propylene as its major component, a polymer of high molecular weight can be obtained. When such catalysts are used, a copolymer having a low melting point can be obtained even though an amount of comonomer units is small. The propylene polymer according to the invention has such properties that: (a) a triad tacticity of three propylene units-chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 90.0%; (b) a proportion of the inversely inserted propylene units based on the 2,1-insertion of a propylene monomer in all propylene insertions, as measured by .sup.13 C-NMR, is not less than 0.7%, and the proportion of the inversely inserted propylene units based on the 1,3-insertion of a propylene monomer, as measured by .sup.13 C-NMR, is not more than 0.05%; and (c) the intrinsic viscosity, as measured in decahydronaphthalene at 135.degree. C., is in the range of 0.1 to 12 dl/g. Such propylene polymer is excellent in rigidity, heat resistance, surface hardness, glossiness, transparency and impact resistance. The propylene copolymer according to the invention has such properties that: (a) said copolymer contains propylene units in an amount of 95 to 99.5% by mol and ethylene units in an amount of 0.5 to 5% by mol; (b) a triad tacticity of three propylene units-chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 90.0%; (c) a proportion of inversely inserted propylene units based on the 2,1-insertion of a propylene monomer in all propylene insertions, as measured by .sup.13 C-NMR, is not less than 0.5%, and a proportion of inversely inserted propylene units based on the 1,3-insertion of a propylene monomer, as measured by .sup.13 C-NMR, is not more than 0.05%; and (d) the intrinsic viscosity, as measured in decahydronaphthalene at 135.degree. C., is in the range of 0.1 to 12 dl/g. Such propylene copolymer is excellent in transparency, rigidity, surface hardness, heat resistance, heat-sealing properties, bleed resistance and impact resistance. The propylene elastomer according to the invention has such properties that: (a) said elastomer contains propylene units in an amount of 50 to 95% by mol and ethylene units in an amount of 5 to 50% by mol; (b) a triad tacticity of three propylene units-chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 90.0%; (c) a proportion of inversely inserted propylene units based on the 2,1-insertion of a propylene monomer in all propylene insertions, as measured by .sup.13 C-NMR, is not less than 0.5%, and a proportion of inversely inserted propylene units based on the 1,3-insertion of a propylene monomer, as measured by .sup.13 C-NMR, is not more than 0.05%; and (d) the intrinsic viscosity, as measured in decahydronaphthalene at 135.degree. C., is in the range of 0.1 to 12 dl/g. Such propylene elastomer is excellent in heat resistance, impact absorbing properties, transparency, heat-sealing properties and anti-blocking properties. |
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