Process of preparing solid molding powder from polytrimellitate amideimides

Abstract

Abstract A PROCESS FOR PREPARING SOLID MOLDING POWDER AND SHAPED ARTICLES FROM POLYTRIMELITATE AMIDE-IMIDES. THE PROCESS COMPRISES TREATING POLYAMIDE-IMIDES PREPARED BY REACTING EQUIMOLAR AMOUNTS OF AN AROMATIC PRIMARY DIAMINE AND AN ACYL HALIDE DERIVATIVE OF TRIMELLITIC ANHYDRIDE WITH A NITROGEN OR A SULFOXIDE CONTAINING ORGANIC POLAR SOLVENT AND WATER OF ORGANIC DILENT HAVING A BOILING POINT BELOW THAT OF THE ORGANIC POLAR SOLVENT, VOLATILIZING THE SOLVENT DILUENT MIXTURE AND THEN HEATING THE POLYTRIMELLITAMIDE-IMIDE TO A TEMPERATURE ABOVE THE BOILING POINT OF THE DILUENT BUT BELOW THE BOILING POINT OF THE ORGANIC POLAR SOLVENT TO REMOVE SUBSTANTIALLY ALL OF THE DILUENT AND THEN HEATING THE POLYMER AT A TEMPERATURE OF ABOUT 170 TO 280*C. TO REMOVE THE RESIDUAL SOLVENT, BUT CONDUCTING THE HEATING AT A RATE SO THAT DEGRADATION IS AVOIDED AT THE SURFACE OF THE POLYTRIMELLITAMIDEIMIDE POWDER. ALSO A PROCESS FOR THE FABRICATION OF SHAPED ARTICLES FROM THE MOLDING POWDER WHICH COMPRISES APPLYING A PRESSURE OF 200 TO 25,000 P.S.I. TO THE MOLDING POWDER WHICH HAS BEEN HEATED TO A TEMPERATURE WITH IN THE RANGE OF ABOUT 575 TO 700*F. AND SUBSEQUENTLY EJECTING THE COALESCED POLYAMIDE-IMIDE IN THE FOAM OF A SHAPED PARTICLE.

Inventors

• 👤 Edwin F Morello

Bibliographic Details