Chain-extending functional polyimides by dipole reactions

Details Chain-extending functional polyimides by dipole reactions Chain-extending functional polyimides by dipole reactions

1975-03-14

1985-08-27

Schain, Howard E.

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

Synthetic resins

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

428458, 525432, 525426, 525421, 525436, 525427, 521157, 528128, 528226, 528127, 528172, 528185, 528188, 528321, 528331, 528481, C08G 2032

Patent

active

045379475

ABSTRACT:
Aromatic polyimides with various functional end-groups such as --CH.dbd.CH.sub.2, --C.tbd.CH, --CN and --CHO are chain-extended (molecular weight increased) by reacting the functional groups with aromatic bis-dipoles. A representative bis-dipole is 1,4-benzene-dinitrile oxide. These polyimides can be shaped and formed prior to chain extending.
The aromatic polyimides appropriate for chain-extending are formed by the reaction of aromatic dianhydrides, aromatic amines and monoamines which contain the functional groups.

REFERENCES:
patent: 3864309 (1975-02-01), Bilow et al.

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