申请人:GENERAL ELECTRIC COMPANY
公开号:EP0400478A2
公开(公告)日:1990-12-05
Branched polycarbonates are prepared by melt equilibration of aromatic cyclic polycarbonate oligomers with a polyhydric phenol having more than two hydroxy groups per molecule, preferably 1,1,1-tris-(4-hydroxyphenyl)ethane, in the presence of a carbonate equilibration catalyst, preferably tetrabutylammonium tetraphenylborate. In an additional embodiment of the invention, a linear aromatic polycarbonate is added to the reaction mixture. Branched polycarbonates prepared according to this invention have high melt strength and high shear sensitivity characteristics and are useful in extrusion and injection molding processing applications and particularly useful in blow molding applications for preparing relatively large articles and panels.
支链聚碳酸酯的制备方法是,在碳酸盐平衡催化剂(最好是四苯基硼酸四丁基铵)存在下,芳香族环状聚碳酸酯低聚物与每分子具有两个以上羟基的多水酚(最好是 1,1,1-三(4-羟基苯基)乙烷)进行熔融平衡。在本发明的另一个实施方案中,向反应混合物中加入线性芳香族聚碳酸酯。根据本发明制备的支链聚碳酸酯具有高熔体强度和高剪切敏感性的特点,可用于挤出和注塑成型加工应用,尤其适用于吹塑成型应用,以制备相对较大的制品和面板。