Catalyst system and process for preparing high clarity, colorles

Details Catalyst system and process for preparing high clarity, colorles Catalyst system and process for preparing high clarity, colorles

1991-02-11

1992-11-24

Kight,, III:

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

Synthetic resins

From carboxylic acid or derivative thereof

528277, 528280, 528281, C08G 6378, C08G 6382, C08G 6387

Patent

active

051663112

ABSTRACT:
A novel catalyst system, a process for using the novel catalyst system, and a product made from the process is described. The novel catalyst system is specific for producing polyethylene terephthalate made from reacting terephthalic acid and ethylene glycol, wherein the catalyst system includes antimony; cobalt and/or zinc, and at least one of zinc, magnesium, manganese or calcium. The antimony is generally present from about 150 ppm to about 650 ppm. The cobalt and/or zinc is usually present from about 5 ppm to about 60 ppm, and the zinc, magnesium, manganese or calcium, as the third component, is generally present from about 10 ppm to about 150 ppm. The amounts of all catalyst components are based on the theoretical yield of the polymer. Using the novel catalyst system to produce PET drastically reduces the polymerization time without sacrificing color and clarity of the polymer produced. In the process, the novel catalyst system can be introduced any time before the polycondensation stage of the manufacturing process.

REFERENCES:
patent: 3907754 (1975-09-01), Tershansy et al.
patent: 3962189 (1976-06-01), Russin et al.
patent: 4010145 (1977-03-01), Russin et al.
patent: 4122107 (1978-10-01), Kenney

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