Production of particulate polyimide polymers

Details Production of particulate polyimide polymers Production of particulate polyimide polymers

C - Chemistry, Metallurgy

08

G

402/221

C08G 73/10 (2006.01) C08J 3/14 (2006.01)

Patent

CA 2004070

PRODUCTION OF PARTICULATE POLYIMIDE POLYMERS Abstract of the Disclosure Described is a process for producing, in particu- late form, aromatic polyimides based on one or more 2,2- bis[4-(aminophenoxy)phenyl]hexafluoropropanes. The process involves forming, heating and agitating in a medium composed of dipolar aprotic solvent and liquid aromatic hydrocarbon solvent, a homogeneous solution of a polyamic acid derived from a substantially equimolar mix- ture of (i) an aromatic tetracarboxylic dianhydride and (ii) a 2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropane, such that a separate phase of particulate aromatic poly- imide is formed in such medium. The process avoids difficulties caused by the tendency of the wet polyimide polymer to agglomerate into stringy or tacky masses which can foul reactor and agitator surfaces.

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