| abstract |
PURPOSE: To obtain the titled resin powder having excellent melt fluidity and heat-resistance, and useful as a heat-resistant adhesive, coating material, etc., by chemically imidating a polyamidic acid having a specific recurring unit with a dehydrative imidating agent. n CONSTITUTION: The objective resin powder having the recurring unit of formula VI can be prepared by chemically imidating the polyamidic acid having the recurring unit of formula I [R 1 is group of formula II or formula III (Z is -CH 2 -, -O-, -SO 2 -, -NR 3 -, etc.); R 2 is group of formula IV or formula V; R 3 is alkyl or aryl; Y is H, alkyl or aryl] with a dehydrative imidating agent (e.g. acetic anhydride). The polyamidic acid having the unit of formula I can be prerpared by reacting 3,3'-diaminobenzophenone with 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride in a polar aprotic solvent such as N,N-dimethylacetamide. The obtained reaction solution can be used as it is for the amidation reaction. n COPYRIGHT: (C)1986,JPO&Japio |