Method for reducing the terminal carboxyl group content of a saturated polyester, a saturated polyester having a reduced terminal carboxyl group content, and a molded article composed of such a saturated polyester,申请号US19800213051-传众专利搜索

Method for reducing the terminal carboxyl group content of a saturated polyester, a saturated polyester having a reduced terminal carboxyl group content, and a molded article composed of such a saturated polyester

申请公布号：US4351936(A)

申请号：US19800213051

申请日期：1980.12.04

申请公布日期：1982.09.28

申请人：

TEIJIN LIMITED

发明人：MATSUMURA, SHUNICHI;INATA, HIROO;MORINAGA, TSUTO

分类号：C08G63/91;(IPC1-7):C08G63/44;C08G73/16

主分类号：C08G63/91

摘要：The present invention provides a process for producing a saturated polyester having a reduced terminal carboxyl group content, which comprises reacting a carboxyl-terminated, substantially linear, fiber-forming saturated polyester with a monocyclic imino ether compound of the formula <IMAGE> (1) wherein R is a group of the following formula <IMAGE> in which R1 is a hydrogen atom or a monovalent organic group non-reactive with the saturated polyester under the reaction conditions, R2 and R3 are a monovalent organic group non-reactive with the saturated polyester under the reaction conditions, and R1 and R2 may be bonded to each other, to form together with the nitrogen atom a 5- or 6-membered ring which is non-reactive with the saturated polyester under the reaction conditions; and X is a divalent organic group non-reactive with the saturated polyester under the reaction conditions, which has two or three ring-member carbon atoms constituting the imino ether ring, at an elevated temperature. The present invention also relates to a process for producing a molded article of a saturated polyester having a reduced terminal carboxyl group content which comprises intimately contacting a carboxyl-terminated, substantially linear, fiber-forming saturated polyester with a monocyclic imino ether compound represented by the formula (1) in a melt-molding machine at a temperature above the temperature at which the saturated polyester melts, or heat-treating a molded article composed of a carboxyl-terminated, substantially linear, fiber-forming saturated polyester with a monocyclic imino ether compound represented by the formula (1) at an elevated temperature at which the molded article can retain its form.