Polyamic acids and methods to convert polyamic acids into polyim

Details Polyamic acids and methods to convert polyamic acids into polyim Polyamic acids and methods to convert polyamic acids into polyim

1994-10-31

1999-07-06

Mullis, Jeffrey

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

Synthetic resins

From ketone or ketene reactant

528335, 528336, 528341, C08G 7310, C08G 7322, C08G 7306

Patent

active

059198923

ABSTRACT:
This invention relates to polyamic acids and to methods for converting polyamic acid into polyimidebenzoxazole polymers. The polyamic acids are prepared by reacting a dianhydride with a diaminobenzoxazole under conditions sufficient to form polyamic acid with an inherent viscosity of greater than 2.0 dL/gram, as measured at 0.2 g/dL in N-methyl-pyrrolidinone at 25.degree. C. The polyamic acids are converted to polyimidebenzoxazole in the form of films, fiber, coatings and the like using thermal and chemical processes.

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