公开(公告)号：US5807965A

公开(公告)日：1998-09-15

申请号：US996897

申请日：1997-12-23

申请人： Gary Charles Davis

发明人： Gary Charles Davis

IPC分类号： C08G63/64 ,  C08G63/79 ,  C08G63/87 ,  C08G64/00

CPC分类号： C08G63/79 ,  C08G63/64

摘要： The level of anhydride linkages in copolyestercarbonates is decreased by preparing the copolyestercarbonate interfacially in a two-step method from at least one dihydroxyaromatic compound and at least one dicarboxylic acid. The first step is conducted at a pH in the range of about 4.5-9.5, employing the combination of a hexaalkylguanidinium salt as a phase transfer catalyst and a tertiary amine such as triethylamine. The proportion of the phase transfer catalyst and tertiary amine are usually in the range of about 1-5 and about 0.01-5.0 mole percent, respectively, based on total dihydroxyaromatic compound and dicarboxylic acid employed. In the second phosgenation step, the pH is raised to at least 10 and a stoichiometric phosgene excess of at least 5% is introduced.

摘要翻译： 通过以两步法从至少一种二羟基芳族化合物和至少一种二羧酸制备共聚酯碳酸酯，共聚酯碳酸酯中的酸酐键的水平降低。 使用六烷基胍鎓盐作为相转移催化剂和叔胺如三乙胺的组合，第一步在约4.5-9.5的pH范围内进行。 基于所用的二羟基芳族化合物和二羧酸，相转移催化剂和叔胺的比例通常分别在约1-5和约0.01-5.0摩尔％的范围内。 在第二次光气化步骤中，将pH提高至至少10，并引入至少5％的化学计量光气过量。