公开(公告)号：JPH03153731A

公开(公告)日：1991-07-01

申请号：JP29440089

申请日：1989-11-13

Applicant: TORAY INDUSTRIES

Inventor： TAMURA MICHIO ,  HAMADA SUSUMU ,  OGAWA TATSURO

IPC: C08G63/78 ,  C08G63/82 ,  C08G63/85

Abstract: PURPOSE:To produce the title high quality polymer within a shortened reaction time while preventing the inactivation and insolubilization of an organotitanium compound catalyst by adding a hindered phenolic compound as a stabilizer to a solution of the catalyst. CONSTITUTION:A process for producing a polybutylene terephthalate by using terephthalic acid or its derivative and 1,4-butanediol as the principal materials, wherein a hindered phenolic compound, e.g. pentaerithritol tetrakis[3-(3,5-di-t- butyl-4hydroxyphenyl)propionate], is added to a solution of an organotitanium compound used as a reaction catalyst. The stability of the catalyst solution can be markedly improved, and a large amount of the solution can be prepared at once. The organotitanium compound catalyst can be prevented from being inactivated and insolubilized by hydrolysis, so that the reaction time can be shortened and the quality of the formed polymer can be markedly improved in the production of the title polymer.

公开(公告)号：JPH03153730A

公开(公告)日：1991-07-01

申请号：JP29440189

申请日：1989-11-13

Applicant: TORAY INDUSTRIES

Inventor： HAMADA SUSUMU ,  TAMURA MICHIO ,  OGAWA TATSURO

IPC: C08G63/78 ,  C08G63/66 ,  C08G63/85

Abstract: PURPOSE:To prevent the formation of tetrahydrofuran as a by-product and to shorten the reaction time by performing the esterification reaction of a dicarboxylic acid component with a glycol component and a polyalkylene glycol in the presence of a polyester/polyether copolymer and a specified reaction catalyst. CONSTITUTION:The esterification reaction of a dicarboxylic acid component based on terephthalic acid with a glycol component based on 1,4-butanediol and a polyalkylene glycol is performed in the presence of a polyester/polyether copolymer and an organotitanium compound and/or an organotin compound, and the formed ester is polycondensed. The polyester/polyether copolymer added in the above reaction is a polymer obtained from terephthalic acid, 1,4butanediol and a polyalkylene glycol by a well-known method, and when the above production process is continuously performed, the polymer formed in situ can be applied.