Method to prepare processable polyimides with non-reactive endgr

Details Method to prepare processable polyimides with non-reactive endgr Method to prepare processable polyimides with non-reactive endgr

1999-08-05

2000-12-26

Hampton-Hightower, P.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528125, 528128, 528172, 528173, 528176, 528183, 528185, 528188, 528220, 528229, 528350, 528491, 528492, 528493, 524600, 524602, 524607, 4284111, 4284735, 525422, 525436, C08F28304, C08F 600, C08F 800, C08G 7310

Patent

active

061661740

ABSTRACT:
Polyimide copolymers were obtained containing 1,3-bis(3-aminophenoxy)benzene (APB) and other diamines and dianhydrides and terminating with the appropriate amount of a non-reactive endcapper, such as phthalic anhydride. Homopolymers containing only other diamines and dianhydrides which are not processable under conditions described previously can be made processable by incorporating various amounts of APB, depending on the chemical structures of the diamines and dianhydrides used. Polyimides that are more rigid in nature require more APB to impart processability than polyimides that are less rigid in nature. The copolymers that result from using APB to enhance processability have a unique combination of properties including: excellent thin film properties, low pressure processing (200 psi and below), improved toughness, improved solvent resistance, improved adhesive properties, improved composite mechanical properties, long term melt stability (several hours at 390 C.), and lower melt viscosities.

REFERENCES:
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patent: 5567800 (1996-10-01), Hergenrother et al.
patent: 5639850 (1997-06-01), Bryant
patent: 5644022 (1997-07-01), Jensen
patent: 5866676 (1999-02-01), Jensen

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