An aqueous insulating varnish which comprises an aqueous medium containing dissolved therein a resin containing ester groups, imide groups and free carboxyl groups in the resin molecule, with a volatile base selected from the group consisting of ammonia and a volatile organic amine to render the resin soluble, the resin comprising the reaction product of A. a carboxyl group containing polyol (containing ester groups in the molecule) comprising the reaction product of 1. AN ORGANIC CARBOXYLIC ACID COMPONENT COMPRISING A. ABOUT 15 TO 100 MOL% OF AT LEAST ONE OF AN AROMATIC TRICARBOXYLIC ACID AND THE ANHYDRIDE THEREOF IN WHICH UP TO 30 MOL% OF THE AROMATIC TRICARBOXYLIC ACID AND THE ANHYDRIDE THEREOF CAN BE REPLACED BY AT LEAST ONE OF AN AROMATIC TETRACARBOXYLIC ACID AND THE ANHYDRIDE THEREOF, AND B. ABOUT 0 TO 85 MOL% OF AT LEAST ONE OF A DICARBOXYLIC ACID AND THE ANHYDRIDE THEREOF; AND 2. AN ORGANIC ALCOHOL COMPONENT COMPRISING AT LEAST ONE ORGANIC POLYHYDRIC ALCOHOL; B. butane tetracarboxylic acid and/or an imide-forming derivative thereof; and C. at least one organic diamine.
申请公布号
DE2439385(C3)
申请公布日期
1981.12.24
申请号
DE19742439385
申请日期
1974.08.16
申请人
NITTO ELECTRIC INDUSTRIAL CO., LTD., IBARAKI, OSAKA, JP
