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Title:
NEW POLYESTER AND PRODUCTION OF POLYESTER
Document Type and Number:
Japanese Patent JPH11310629
Kind Code:
A
Abstract:

To obtain a polyester having excellent gas barrier properties, transparency, etc., slightly generating acetaldehyde, comprising a specific dicarboxylic acid constituent unit and a prescribed dial constituent unit by specifying an intrinsic viscosity, melting point, etc.

This polyester comprises (A) a dicarboxylic acid constituent unit composed of 40-99.5 wt.% based on the whole dicarboxylic acid constituent unit of a constituent unit from terephthalic acid, 0.5-60 wt.% of a constituent unit from a naphthalenedicarboxylic acid and 0-25 wt.% of a constituent unit from isophthalic acid and (B) a dial constituent unit composed of 95-100 wt.% based on the whole diol constituent unit of a constituent unit from ethylene glycol and 0-5 wt.% of a polyalkylene glycol constituent unit containing a 2-10C alkylene oxide chain, has 0.5-1.5 dL/g intrinsic viscosity and a melting point (Tm) satisfying the equation [1/527-0.0017.ln(1-(mI+mN)/200)]-1-273<Tm≤254 [mI is the ratio (mol.%) of a constituent unit from isophthalic acid in the total dicarboxylic acid constituent unit; mN is the ratio of a constituent unit from the naphthalenedicarboxylic acid]. The amount of the constituent units satisfies LNET≥0.5×mN.


Inventors:
NAKAMACHI KOJI
Application Number:
JP3232499A
Publication Date:
November 09, 1999
Filing Date:
February 10, 1999
Export Citation:
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Assignee:
MITSUI CHEMICALS INC
International Classes:
C08G63/183; C08G63/189; C08G63/672; C08G63/80; (IPC1-7): C08G63/80
Attorney, Agent or Firm:
Shunichiro Suzuki (1 person outside)