Method for making a polyimide blend

Details Method for making a polyimide blend Method for making a polyimide blend

1995-06-05

1998-01-06

Zemel, Irina S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525422, 525426, 525432, 525436, 528170, 528176, 528183, 528289, C08G 1310, C08F28304, C08L 7908

Patent

active

057055742

ABSTRACT:
Polyimide oligomers include (1) linear, mono-functional crosslinking oligomers prepared by condensing a monoanhydride end cap with a diamine that includes alternating ether and "sulfone" (--SO.sub.2 --, --S--, --CO--, --(CF.sub.3).sub.2 C--, or --(CH.sub.3).sub.2 C--) linkages connecting alternating aromatic radicals and with a dianhydride (or dianhydride mixture), particularly the unsaturated, aliphatic dianhydride commonly known as MCTC; (2) linear, mono- or difunctional crosslinking oligomers prepared by condensing an amine end cap with a diamine and a dianhydride; and (3) multidimensional, crosslinking oligomers having an aromatic hub and at least three radiating arms connected to the hub, each arm including a crosslinking end cap at its distal end and at least one imide linkage.
Blends, prepregs, and composites can be prepared from the oligomers. The blends are prepared by mixing miscile solutions of the oligomer and a noncrosslinking polyimide polymer to forma lacquer which is then swept out into a fabric to form a polyimide blend prepreg.
Multidimensional oligomers can be prepared using etheranhydride intermediates or etheramine intermediates formed by reacting a suitable hub with nitrophthalic anhydride or aminophenol.

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