Process for the production of clear copolyesters of terephthalic

Details Process for the production of clear copolyesters of terephthalic Process for the production of clear copolyesters of terephthalic

1998-02-24

1999-08-24

Acquah, Sam A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528275, 528298, 528302, 528308, 5283086, C08G 6368

Patent

active

059425962

ABSTRACT:
The present invention relates to a process comprising polymerizing repeat units derived from an acid component comprising terephthalic acid and naphthalenedicarboxylic acid and at least one glycol in the presence of less than about 10 ppm sodium carbonate and between about 10 and about 60 ppm phosphorus. Polyesters formed via the process of the present invention display surprisingly good clarity and color.

REFERENCES:
patent: 4454312 (1984-06-01), Kuze et al.
patent: 5017680 (1991-05-01), Sublett
patent: 5321074 (1994-06-01), Trotter et al.
File WPI, Derwent accession No. 98-103918, Nippon Ester Co Ltd: "Polyester copolymer preparation, used in bottles, films, etc.--comprises adding di; alkyl 2,6-naphthalene di:carboxylate and ethylene glycol to bis(beta-hydroxyethyl) terephthalate, transesterifying in presence of titanium compound or tin compound, etc;" & JP,A,9221541, 970826, DW9810.

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