Patent ID: 6476182
Filing Date: 2002-11-05
Classification: C08G

Abstract:
A melt-processible, thermoplastic copolyimide comprising a reaction product of components consisting essentially of:(I) an aromatic dianhydride component of 3,3â€²4,4â€²-biphenyltetracarboxylic dianhydride (BPDA); (II) an aromatic diamine component consisting essentially of: (A) a first aromatic diamine selected from the group consisting of 1,3-bis(4-aminophenoxy)benzene (APB-134) and 3,4â€²-oxydianiline (3,4â€²-ODA); (B) a second aromatic diamine selected from the group consisting of 1,3-bis(4-aminophenoxy)benzene (APB-1 34), 3,4â€²-oxydianiline (3,4â€²-ODA), 1,3-bis(3-aminophenoxy)benzene (APB-133), 4,4â€²-oxydianiline (4,4â€²-ODA), 1,4-bis(4-aminophenoxy) benzene (APB-144), 3-diaminobenzene (MPD), 4,4â€²-bis(4-aminophenoxy)diphenyl sulfone (BAPS), 4,4â€²-bis(4-aminophenoxy)-biphenyl (BAPB), 2,2-bis(4-[4-aminophenoxyl]phenyl)propane (BAPP), bis(4-[4-aminophenoxy]phenyl ether (BAPE), 4,4â€²-oxydianiline (4,4â€²-ODA) and 1,3-diaminobenzene (MPD) in combination, and 4,4â€²-oxydianiline (4,4â€²-ODA) and 1,4-diaminobenzene (PPD) in combination; â€ƒwith the proviso that the second diamine is not the same as the first diamine; and (III) an endcapping component; wherein the copolyimide has a stoichiometry in the range from 93% to 98%, exhibits a melting point in the range of 330Â° C. to 385Â° C., and exhibits reoverable crystallinity as determined by differential scanning calorimetry analysis.