Polyterephthalates and copolymers thereof having high clarity an

Details Polyterephthalates and copolymers thereof having high clarity an Polyterephthalates and copolymers thereof having high clarity an

1982-09-07

1984-05-08

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

525437, 528286, 5282953, 528300, 528302, 528305, 5283086, 5283087, C08G 6304, C08G 6322, C08G 6316

Patent

active

044475950

ABSTRACT:
This invention relates to polyethylene terephthalate and copolymers thereof having high clarity and process for making the same. The invention provides a process for making PET using protonic acid catalysts which result in a polymer having a level of haze which is lower than has heretofore been attainable, using conventional metallic catalysts. Further, the polyesters so produced have a lower melt temperature which improves the processability.

REFERENCES:
patent: 4045431 (1977-08-01), Fagerburg
patent: 4155889 (1979-05-01), Fagerburg
patent: 4340721 (1982-07-01), Bonnebat et al.
patent: 4361681 (1982-11-01), Bernhardt

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