Title:
PRODUCTION OF POLYESTER HAVING HIGH DEGREE OF POLYMERIZATION
Document Type and Number:
Japanese Patent JPH05117378
Kind Code:
A
Abstract:
PURPOSE:To obtain a polybutylene terephthalate having high degree of polymerization in high efficiency by adding a specific amount of an aromatic sulfonic acid compound to terephthalic acid (caster) and 1,4-butanediol and subjecting the mixture to melt-polymerization and solid-phase polymerization. CONSTITUTION:A polybutylene terephthalate having high degree of polymerization is produced by carrying out melt-polymerization of (A) an acid component composed mainly of terephthalic acid (lower alcohol ester) and (B) a diol component composed mainly of 1,4-butanediol, temporarily solidifying the obtained polybutylene terephthalate and subjecting the solid polymer to solid-phase polymerization. In the above process, the reactional mixture is incorporated, prior to the solid-phase polymerization, with 0.005-2mol% (based on the total constituent acid component) of an aromatic sulfonic acid compound of formula (Ar is benzene ring or naphthalene ring; (n) is 1-10; R is 2-3C alkylene; M is alkali metal selected from lithium, sodium and potassium) at an arbitrary stage from the monomer compounding stage to the start of the solid-phase polymerization and subjected to solid-phase polymerization to obtain the objective polyester.
Inventors:
KAWAGUCHI KUNIAKI
NAKANE TOSHIO
HIJIKATA KENJI
NAKANE TOSHIO
HIJIKATA KENJI
Application Number:
JP27968791A
Publication Date:
May 14, 1993
Filing Date:
October 25, 1991
Export Citation:
Assignee:
POLYPLASTICS CO
International Classes:
C08G63/688; C08G63/78; C08G63/80; (IPC1-7): C08G63/688; C08G63/78; C08G63/80
Attorney, Agent or Firm:
Kaoru Furuya (3 outside)