Chain-extending phenolic end-capped polyimides

Details Chain-extending phenolic end-capped polyimides Chain-extending phenolic end-capped polyimides

1975-03-14

1977-05-31

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 47C, 260 51R, 260515, 260 52, 260 63R, 260 64, 260 65, 260 78TF, C08G 7310

Patent

active

040268713

ABSTRACT:
Aromatic polyimides with phenolic end groups are chain-extended (molecular weight increased) by reacting them with formaldehyde, compounds capable of generating formaldehyde under the reaction conditions or hexamethylene tetramine in the presence of a catalytic amount of lime. These polyimides can be shaped and formed prior to the chain-extending.
The aromatic polyimides appropriate for chain-extending are formed by the reaction of aromatic dianhydrides, aromatic diamines and phenolic compounds such as aminophenol.

REFERENCES:
patent: 3437636 (1969-04-01), Angelo
patent: 3442861 (1969-05-01), Hoegger

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