Patent ID: 6476177
Filing Date: 2002-11-05
Classification: C08G

Abstract:
A melt-processible, thermoplastic copolyimide comprising a reaction product of components comprising:(I) an aromatic dianhydride component consisting essentially of: (A) 3,3â€²,4,4â€²-biphenyltetracarboxylic dianhydride (BPDA); and (B) 4,4â€²-oxydiphthalic anhydride (ODPA); (II) an aromatic diamine component selected from the group consisting of 1,3-bis(4-aminophenoxy)benzene (APB-134); 3,4â€²-oxydianiline (3,4â€²-ODA); 3,4â€²-oxydianiline (3,4â€²-ODA) and 4,4â€²-oxydianiline (4,4â€²-ODA) in combination; 3,4â€²-oxydianiline (3,4â€²-ODA) and 1,4-diaminobenzene (PPD) in combination; 1,3-bis(4-aminophenoxy)benzene (APB-134) and 4,4â€²-oxydianiline (4,4â€²-ODA) in combination; and 1,3-bis(4-aminophenoxy)benzene (APB-134) and 1,4-diaminobenzene (PPD) in combination; and (III) an endcapping component; wherein the copolyimide has a stoichiometry in the range from 93% to 98%, has either a molar ratio of 3,3â€²,4,4â€²-biphenyltetracarboxylic dianhydride/4,4â€²-oxydiphthalic anhydride (BPDA/ODPA) of greater than or equal to 60/40 but less than or equal to 95/5, exhibits a melting point in the range of 330Â° C. to 385Â° C., and exhibits recoverable crystallinity as determined by differential scanning calorimetry analysis.