Catalyst for preparing high clarity, colorless polyethylene tere

Details Catalyst for preparing high clarity, colorless polyethylene tere Catalyst for preparing high clarity, colorless polyethylene tere

1989-05-22

1991-04-16

Shine, W. J.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

502200, 502226, 502229, 502324, 502328, 502329, 502343, 528275, 528280, 528281, 528285, B01J 2378, B01J 2380, B01J 2384

Patent

active

050082302

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 terephtalate 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:
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patent: 4080317 (1978-03-01), Morawetz et al.
patent: 4122107 (1978-10-01), Kenney
patent: 4820862 (1989-04-01), Hoffmann et al.
"kinethic Aspects of Catalyzed Reactions in the Formation of Poly(Ethylene Terephthalate)", by Hovenkamp; Journal of Polymer Science: Part A-1, vol. 9, 3617-3625, (1971).
"Studies of the Formation of Poly(Ethylene Terephthalate): 3. Catalytic . . . ", by Tomita et al; Polymer, 1975, vol. 16, Mar., pp. 185-190.
"Aspects of the Chemistry of Poly(Ethylene Terephthalter): 5. Polymerization . . . ", by Shah et al; Polymer, 1984, vol. 25, Sep., pp. 1333-1336.
Above Reference "A" was Provided by Applicant.

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