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| PATENT EXAMPLES |
To prepare the CPP polymer 40 grams of CPP powder was added to 500 ml boiled acidic anhydride at approximately 130 degrees C. under dry nitrogen reflux. The reaction was stopped after 15 min. and the solution was filtered through a filter paper to another 1 liter round bottom flask. The solution was then concentrated to 150 ml by evaporation. The solution was allowed to crystallize which was then separated by filtration and transferred to 200 ml of anhydrous diethyl ether in an erlenmeyer flask and allowed to swirl for several hours at room temperature. The white crystals were separated by filtration and dried in a calcium chloride desicator under vacuum. It is essential that the degree of polymerization of the prepolymer not be greater than 4 by G.C.P. A high molecular weight copolymer of phenylene dipropionic acid and sebacic acid in a ratio of 20:80 was prepared using the sebacic acid prepolymer as prepared in Example I above. A phenylenedipropionic prepolymer was prepared by adding 60 grams of phenylenedipropionic acid to 500 ml boiling acidic anhydride under dry argon and refluxed for 60 minutes. The excess acetic anhydride is removed by an evaporator at 60 degrees C. to yield a white solid which was recrystallized from 30 ml toluene at 0 degrees C. The crystals are then extracted with 200 ml of a diethyl ether and petroleum ether (1:1) mixture for five hours at room temperature. The pure crystals are dried under vacuum under calcium chloride to yield 61 grams of prepolymer with a melting point of 74 to 75 degrees C. EXAMPLE VIII A 50:50 copolymer of PDP:CPP was prepared by mixing 1.14 grams of PDP prepolymer with 2.0 grams of CPP prepolymer (as prepared above) and polymerizing at 180 degrees C. under high vacuum (less than 10.sup.-2 mm Hg) for 90 minutes. The purified copolymer had a melting point of 158 to 160 degrees C, a weight average molecular weight of 34,400, and intrinsic viscosity of 0.65 dl/g and a composition of PDP:CPP (48:52). EXAMPLE VIII A 50:50 copolymer of PDP:CPP was prepared by mixing 1.14 grams of PDP prepolymer with 2.0 grams of CPP prepolymer (as prepared above) and polymerizing at 180 degrees C. under high vacuum (less than 10.sup.-2 mm Hg) for 90 minutes. The purified copolymer had a melting point of 158 to 160 degrees C, a weight average molecular weight of 34,400, and intrinsic viscosity of 0.65 dl/g and a composition of PDP:CPP (48:52). |
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