Title:
PRODUCTION OF AROMATIC POLYESTER
Document Type and Number:
Japanese Patent JPH05230199
Kind Code:
A
Abstract:
PURPOSE:To efficiently produce the subject polyester having a high softening point and not containing a foreign material by depolymerizing an aromatic polyester in an alkylene glycol, subsequently separating insoluble particles using a specified centrifugation separator and then carrying out polycondensation again. CONSTITUTION:An aromatic polyester is depolymerized by using an alkylene glycol component in an amount of 0.1 to 5.0mol based on 1mol acid component constituting the aromatic polyester. The resultant aromatic dicarboxylic acid glycol ester and low-molecular polymers are melted at 120 to 250 deg.C and the molten material is charged into a centrifugation separator equipped with plural discs in the inside. Polyester-insoluble particles are separated by centrifugation in a condition of 1X10<2> to 2X10<4>G centrifugal force and polycondensation is then carried out in the presence of a polycondensation catalyst such as a glycol- soluble antimony compound. Thus, the objective polyester can be obtained.
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Inventors:
MORITA TORU
OKASAKA HIDESADA
OKASAKA HIDESADA
Application Number:
JP9448192A
Publication Date:
September 07, 1993
Filing Date:
April 14, 1992
Export Citation:
Assignee:
TORAY INDUSTRIES
International Classes:
C08G63/78; C08G63/16; C08G63/91; (IPC1-7): C08G63/78