Polyimide precursor composition for extrusion molding of polyimi

Details Polyimide precursor composition for extrusion molding of polyimi Polyimide precursor composition for extrusion molding of polyimi

1995-05-11

1996-12-31

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

Utilizing centrifugal force or rotating forming zone

264169, 264204, 2642096, 264216, 26421124, 26433119, 528183, 528353, B29B 910, B29C 4788

Patent

active

055891110

ABSTRACT:
A process for preparing molded articles of a polyimide is provided the steps of melting and extruding, at 50.degree. to 100.degree. C., a polyimide precursor composition for extrusion molding of a polyimide which includes 30 to 60% by weight of a polyimide precursor (c) obtained by reacting an aromatic tetracarboxylic dianhydride or its derivative (a) with an aromatic diamine or its derivative (b) in a good solvent of the polyimide precursor and then depositing the resultant polyimide precursor solution in a poor solvent of the polyimide precursor, 0.1 to 5% by weight of the poor solvent, and 35 to 69.9% by weight of the good solvent, and then heating the molded composition at 250.degree. to 500.degree. C. to imidate the same or its derivative (b) in a good solvent of the polyimide precursor and then depositing the resultant polyimide precursor (c) solution in a poor solvent of the polyimide precursor, 0.1 to 5% by weight of the poor solvent, and 35 to 69.9% by weight of the good solvent, and then heating the molded composition at 250.degree. to 500.degree. C. to imidate the same.

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