Title:
PRODUCTION OF POLYESTER
Document Type and Number:
Japanese Patent JPH04114030
Kind Code:
A
Abstract:
PURPOSE:To obtain a polyester of high melt viscosity, stable in extrudability, thus suitable for extrusion forming by addition of an aromatic polycarboxylic anhydride at the initial or intermediate stage of the polymerization reaction. CONSTITUTION:A reaction is carried out between (A) terephthalic acid and (B) ethylene glycol, followed by polymerization; and at a point of the initial or intermediate state of the polymerization, 0.05-0.5mol%, based on the component A, of (C) an aromatic polycarboxylic anhydride such as trimellitic anhydride is added, in the form of the component B's slurry, to the system followed by continuing the polymerization, thus giving the objective polyester.
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Inventors:
KURATSUJI TAKATOSHI
Application Number:
JP23062190A
Publication Date:
April 15, 1992
Filing Date:
September 03, 1990
Export Citation:
Assignee:
TEIJIN LTD
International Classes:
C08G63/183; C08G63/181; C08G63/78; (IPC1-7): C08G63/183; C08G63/78
Domestic Patent References:
| JPS5422493A | 1979-02-20 | |||
| JPS60209073A | 1985-10-21 | |||
| JPS6116920A | 1986-01-24 | |||
| JPH01284548A | 1989-11-15 | |||
| JPS6375112A | 1988-04-05 |
Attorney, Agent or Firm:
Maeda Junhiro