Title:
HIGHLY CRYSTALLINE POLYESTER COPOLYMER
Document Type and Number:
Japanese Patent JPH0297519
Kind Code:
A
Abstract:
PURPOSE:To improve mechanical strengths, thermal properties, resistance to chemicals and moldability by reacting a dicarboxylic acid (derivative) mainly comprising terephthalic acid, a low-MW glycol mainly comprising ethylene glycol and a specific polymer. CONSTITUTION:beta-Methyl-delta-valerolactone is polymerized through ring opening in the presence of an initiator (e.g., ethylene glycol) and a catalyst to give a polymer. A dicarboxylic acid (derivative) component contg. at least 90mole% terephthalic acid and a low-MW glycol component contg. at least 90mole% ethylene glycol are esterified or transesterified. The product is mixed with 0.1-5wt.% beta-methyl-delta-valerolactone and/or its polymer obtd. as above, and polycondensed.
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Inventors:
KANAMORI TOSHIYUKI
TAJIRI TAKAYUKI
YOSHIDA TOMOHIKO
TAJIRI TAKAYUKI
YOSHIDA TOMOHIKO
Application Number:
JP24968688A
Publication Date:
April 10, 1990
Filing Date:
October 03, 1988
Export Citation:
Assignee:
MITSUBISHI RAYON CO
International Classes:
C08G63/60; (IPC1-7): C08G63/60
Next Patent: JPH0297520