公开(公告)号：US5616681A

公开(公告)日：1997-04-01

申请号：US550964

申请日：1995-10-31

申请人： Hiroshi Itoh ,  Yoshinobu Yamamoto ,  Koji Fukuhara ,  Masahiro Shiroshima ,  Hiroya Kobayashi

发明人： Hiroshi Itoh ,  Yoshinobu Yamamoto ,  Koji Fukuhara ,  Masahiro Shiroshima ,  Hiroya Kobayashi

IPC分类号： C08G18/42 ,  C08G63/42 ,  C08G63/78 ,  C08G63/82 ,  C08G63/84 ,  C08G63/85

CPC分类号： C08G18/4244 ,  C08G18/4291 ,  C08G63/42 ,  C08G63/78 ,  C08G63/823 ,  C08G63/84 ,  C08G63/85 ,  C08G2230/00

摘要： A method for producing an aliphatic polyester having a biodegradability and a higher melting point than conventional aliphatic polyester by suppressing a volatile component generated by side reaction or decomposition reaction with industrially good efficiency and economically in a relatively short period of time, the method enabling a polymerization at vacuum which permits a use of general vacuum pump. The aliphatic polyester can be obtained, for example, by a ring-opening copolymerization of a cyclic acid anhydride with a cyclic ether in a presence of a zirconium compound. The aliphatic polyester also can be obtained by performing a polymerization of raw materials of the aliphatic polyester so as to have a degree of viscosity in the range of 10-10,000 poise when 0.1-30 hours elapsed after the reaction started at reaction temperature of the reaction system under conditions of reaction temperature in the range of 180.degree. C. to 280.degree. C. and reaction pressure in the range of 0.3 mmHg to 3.0 mmHg.

摘要翻译： 通过抑制由副反应或分解反应产生的挥发性成分，具有生物降解性和熔点比普通脂肪族聚酯高的脂肪族聚酯的制造方法，具有工业上良好的效率和经济地在相当短的时间内生产的方法，能够进行聚合的方法 在允许使用一般真空泵的真空下。 脂肪族聚酯可以通过例如在锆化合物的存在下通过环状酸酐与环状醚的开环共聚获得。 脂肪族聚酯也可以通过进行脂肪族聚酯的原料的聚合而获得，使得在反应开始后的反应开始0.1〜30小时后，粘度在10〜10000泊的范围内 系统在反应温度在180℃至280℃的范围内，反应压力在0.3mmHg至3.0mmHg的范围内。