Direct process for preparing semi-crystalline polyimides

Details Direct process for preparing semi-crystalline polyimides Direct process for preparing semi-crystalline polyimides

1994-09-01

1995-11-07

Hampton-Hightower, P.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528172, 528173, 528179, 528183, 528185, 528188, 528220, 528229, 528350, 528351, C08G 7310, C08G 6926

Patent

active

054649285

ABSTRACT:
The invention is a direct process for preparing semi-crystalline polyimides. This process comprises the steps of: providing a polar aprotic solvent, adding a dianhydride and a diamine to the solvent to form a mixture, stirring the mixture at ambient temperature, and adding glacial acetic acid to the mixture to provide a ratio of polar aprotic solvent to glacial acetic acid which ranges from about 90 to 10 to about 75 to 25 by volume to form a solution. The solution was heated to a range from about 110.degree. C. to about 140.degree. C. to form a polyimide precipitate. The polyimide precipitate was recovered as a semi-crystalline polyimide powder.

REFERENCES:
patent: 5061783 (1991-10-01), St. Clair
patent: 5147966 (1992-09-01), St. Clair et al.

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