Miscible blends of polyimide polymers and process for forming th

Details Miscible blends of polyimide polymers and process for forming th Miscible blends of polyimide polymers and process for forming th

1990-04-24

1992-05-05

Carrillo, Ana L.

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

Synthetic resins

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

525436, C08L 7908

Patent

active

051108798

ABSTRACT:
Novel polyimide blends are formed of polyimide polymers each having moieties derived from dianhydride and diamine comonomers. The blends of the present invention may be formed by selecting polyimide polymers having structurally identical dianhydride-derived moieties, but structurally different diamine-derived moieties. Preferred miscible blends are formed wherein one of polyimides in the blend is the polymer condensation product of a dianhydride selected from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride, 3,3',4,4'-diphenyl tetracarboxylic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, bis(3,4-dicarboxyphenyl ether dianhydride, pyromellitic dianhydride, and mixtures thereof, and 2,2-bis(3-aminophenyl) hexafluoropropane, and another of the polyimides in the blend is the polymer condensation product of the same dianhydride and mixtures thereof noted above, and 2,2-bis(4-aminophenyl) hexafluoropropane.

REFERENCES:
patent: 3505168 (1970-04-01), Dunphy et al.
patent: 4107125 (1978-08-01), Lovejoy et al.
patent: 4913759 (1990-08-01), Wright et al.
patent: 4954578 (1990-09-01), Ree et al.

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