Process for producing the polyester polyethylene terephthalate (

Details Process for producing the polyester polyethylene terephthalate ( Process for producing the polyester polyethylene terephthalate (

1990-07-26

1992-05-26

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528176, 528275, 528277, 528280, 528285, C08G 6300, C08G 6302, C08G 6378, C08G 6382

Patent

active

051169380

ABSTRACT:
A novel catalyst composition, and a process for using the novel catalyst system to produce polyester is described. The novel catalyst composition is specific for producing polyester from a lower dialkyl ester of a dicarboxylic acid and glycol, wherein the catalyst composition includes from about 20 ppm to about 150 ppm manganese; from about 50 ppm to about 250 ppm lithium; from about 10 ppm to about 40 ppm cobalt; and from about 200 ppm to about 400 ppm antimony, all amounts being based upon the expected yield of the polyester. The process for using the novel catalyst composition to make polyester includes the step of employing an effective catalytic amount of manganese and lithium in an ester interchange reaction from a lower dialkyl ester of a dicarboxylic acid and glycol to produce monomer; and using an effective catalytic amount of cobalt and antimony in the polycondensation reaction to convert the monomer to polyester. Using the novel catalyst composition or novel process to produce polyester drastically increases both the ester interchange rate and the polymerization rate, such that the ester interchange time and the polycondensation time are drastically reduced as compared to more conventional systems for producing polyester.

REFERENCES:
patent: 3657180 (1972-04-01), Cohn et al.
patent: 3709859 (1973-01-01), Hrach et al.
patent: 3907754 (1975-09-01), Tershansy et al.
patent: 3962189 (1976-06-01), Russin et al.
patent: 4010145 (1977-03-01), Russin et al.

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