C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/218, 6/221,
C08G 73/10 (2006.01) C08G 73/12 (2006.01) C08J 5/24 (2006.01) C08K 5/34 (2006.01)
Patent
CA 2017108
PATENT POLYIMIDE OLIGOMERS AND BLENDS AND METHOD OF CURING ABSTRACT A preferred class of polyimide oligomers include (1) linear, difunctional crosslinking oligomers prepared by condensing an imidophenylamine end cap with a lower alkylene diamine or a polyaryldiamine such as 3,3'-phenoxyphenyl- sulfone diamine and with a dianhydride, particularly 4,4'-phenoxyphenylsulfone dianhydride; and (2) multidimen- sional, crosslinking, polyimide oligomers having an aromatic hub and at least two radiating arms connected to the hub, each arm including a crosslinking imidophenylamine end cap at its distal end and at least two imide linkages. Blends, prepregs, and composites can be prepared from the oligomers. Also described is a method for improving the thermal stability of composites prepared from linear and multidimensional polyimide oligomers and blends which includes the steps of (a) impregnating a fabric with a polyimide oligomer or blend to form a prepreg; (b) heating the prepreg at an elevated temperature and under pressure for a time sufficient to cure the prepreg and form a com- posite; and (c) post-curing the composite at a temperature of approximately 700°F and for a time sufficient to improve the thermal stability thereof.
Lubowitz Hyman R.
Sheppard Clyde H.
Boeing Company (the)
Lubowitz Hyman R.
Sheppard Clyde H.
Smart & Biggar
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