PREPARATION OF AROMATIC POLYESTER POLYCARBONATE RESIN

• Main Authors: SAKATA KATSUYUKI, KAMIYAMA KATSUHISA
• Format: Patent
• Language: English
• Published: 21.10.1982
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PURPOSE:To obtain the titled resin by evaporating and concentration a methylene chloride solution of a resin having a specific structural unit and obtained by the polycondensation of a dihydroxydiaryl compound, terephthaloyl chloride, etc. and phosgene, at a specific rate of evaporation, thereby easily pulverizing the resin and removing the methylene chloride. CONSTITUTION:A dilute methylene chloride solution of an aromatic polyester polycarbonate resin having the structural units of formulaIand formula II (X is divalent group; aromatic nucleus may have substituent group) is prepared by the polycondensation of an alkaline aqueous solution of a dihydroxydiaryl compoud, a methylene chloride solution of tere(and/or iso)phthaloyl chloride, and phosgene. The dilute solution is washed to attain a resin concentration of 3-10wt%, and gelatinized by evaporating methylene chloride (the rate of evaporation of methylene chloride is maintained to 1-5kg/hr per 1kg of the resin in the methylene chloride solution at normal pressure and 40-150 deg.C and at a resin cncentration of 20-35%). The gel is crushed, and the methylene chloride is removed by the thermal drying to obtain the objective resin.