Abstract 1. A PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT POLYAMIDE-IMIDE POLYMERS HAVING FILM-FORMING PROPERTIES WHICH PROCESS COMPRISES FIRST CONDENSING TRIMELLITIC ANHYDRIDE AND A PRIMARY DIAMINE IN A MOLE RATIO OF ABOUT 1 TO 0.55 TO ABOUT 1 TO 0.95 AT TEMPERATURE OF ABOUT 210*C, THE ABOUT 250*C. TO GIVE A LOW MOLECULAR WEIGHT PREPOLYMER HAVING THE CARBOXYLIC ACID ANHYDRIDE GROUPS REACTED WITH THE DIAMINE AND A PORTION OF THE CARBOXYLIC ACID GROUPS REACTED WITH THE DIAMINE LEAVING THE REMAINING CARBOXYLIC ACID GROUPS UNREACTED (AN EXCESS OF TRIMELLITIC ANHYDRIDE MOIETIES) AND SECOND FURTHER CONDENSING THIS PREPOLYMER WITH ABOUT 0.45 TO ABOUT 0.75 MOLES TO ABOUT 0.05 TO ABOUT 0.35 MOLES OF A DIISOCYANATE FOR EACH MOLE OF TRIMELLITIC ANHYDRIDE IN AN INERT SOLVENT AT A TEMPERATURE OF ABOUT 25*C. TO ABOUT 150*C.
A PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT POLYAMIDE-IMIDE POLYMERS HAVING FILM-FORMING PROPERTIES WHICH PROCESS COMPRISES FIRST CONDENSING TRIMELLITIC ANHYDRIDE AND A PRIMARY DIAMINE IN A MOLE RATIO OF ABOUT 1 TO 0.55 TO ABOUT 1 TO 0.95 AT TEMPERATURE OF ABOUT 210*C, THE ABOUT 250*C. TO GIVE A LOW MOLECULAR WEIGHT PREPOLYMER HAVING THE CARBOXYLIC ACID ANHYDRIDE GROUPS REACTED WITH THE DIAMINE AND A PORTION OF THE CARBOXYLIC ACID GROUPS REACTED WITH THE DIAMINE LEAVING THE REMAINING CARBOXYLIC ACID GROUPS UNREACTED (AN EXCESS OF TRIMELLITIC ANHYDRIDE MOIETIES) AND SECOND FURTHER CONDENSING THIS PREPOLYMER WITH ABOUT 0.45 TO ABOUT 0.75 MOLES TO ABOUT 0.05 TO ABOUT 0.35 MOLES OF A DIISOCYANATE FOR EACH MOLE OF TRIMELLITIC ANHYDRIDE IN AN INERT SOLVENT AT A TEMPERATURE OF ABOUT 25*C. TO ABOUT 150*C.
Claim 2
Dependent Claim
129 words
A PROCESS FOR PREPARING HIGH MOLECULAR WEIGHT POLYAMIDE-IMIDE POLYMERS HAVING FILM-FORMING PROPERTIES WHICH PROCESS COMPRISES FIRST CONDENSING TRIMELLITIC ANHYDRIDE AND A PRIMARY DIAMINE IN A MOLE RATIO OF ABOUT 1 TO 0.55 TO ABOUT 1 TO 0.95 AT TEMPERATURE OF ABOUT 210*C, THE ABOUT 250*C. TO GIVE A LOW MOLECULAR WEIGHT PREPOLYMER HAVING THE CARBOXYLIC ACID ANHYDRIDE GROUPS REACTED WITH THE DIAMINE AND A PORTION OF THE CARBOXYLIC ACID GROUPS REACTED WITH THE DIAMINE LEAVING THE REMAINING CARBOXYLIC ACID GROUPS UNREACTED (AN EXCESS OF TRIMELLITIC ANHYDRIDE MOIETIES) AND SECOND FURTHER CONDENSING THIS PREPOLYMER WITH ABOUT 0.45 TO ABOUT 0.75 MOLES TO ABOUT 0.05 TO ABOUT 0.35 MOLES OF A DIISOCYANATE FOR EACH MOLE OF TRIMELLITIC ANHYDRIDE IN AN INERT SOLVENT AT A TEMPERATURE OF ABOUT 25*C. TO ABOUT 150*C.