METHOD FOR PRODUCING FOAMED AROMATIC POLYCARBONATE RESIN AND FOAMED AROMATIC POLYCARBONATE RESIN

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a foamed aromatic polycarbonate resin stably keeping the dimension even by using at a high temperature and provide a foamed aromatic polycarbonate resin produced by the method. SOLUTION: The method for forming a foamed aromatic polycarbonate resin comprises the heat-treatment process to heat an extrusion foamed material composed of an aromatic polycarbonate resin at≥(Tg-40°C) and≤Tg wherein Tg (°C) is the glass transition temperature of the aromatic polycarbonate resin and cool to≤(Tg-100°C). The heat-treatment is carried out in a manner to obtain the foamed product having a dimensional change ratio of≤0.15% after a heating test of the product at Tg-40°C for 30 hours. COPYRIGHT: (C)2007,JPO&INPIT