E.i. Dupont De Nemours and Company

George R Goodley

Robin Nikolas Greene

Donald Albert Shiffler

Charles King

Harold J Taylor

Charles W Prather

Phillip R Harman

A cobalt/aluminum catalyst is used in the polymerization reaction to form polyesters of terephthalic acid and an ethylene glycol.

Polyester polymers and products

A cobalt/aluminum catalyst for the polymerization of polyesters of terephthalic acid and an ethylene glycol, and a process for the preparation of such catalysts.

Catalyst and process for producing catalyst

A cobalt/aluminum/chlorine catalyst for the polymerization of polyesters of terephthalic acid and an ethylene glycol, a process for the preparation of such catalysts, a process for the polymerization of terephthalic acid and an ethylene glycol, a process of spinning fibers of such polymers where reduced spinneret wiping is achieved, and fibers of such polyesters containing catalyst residues of cobalt/ aluminum/chlorine, and films or bottles of said polymer.

Catalyst and process for producing polyester

An improved fishing lure has a multi-strand skirt of flexible, coalesced multi-filament strands formed of clear spandex or clear thermoplastic elastomer. Each strand is colored or colorless and has a large void fraction and high glitter.

Fishing lure with improved elastomeric skirt

When varied spin-oriented polyester filaments are produced over the course of time in a continuous multi-machine operation from polymeric precursors, the dyeabilities of the varying products are controlled and adjusted by adding small amounts of a chain-branching agent, such as a derivative of trimellitic acid, preferably trishydroxyethyl trimellitate. The process conveniently lends itself to automation of the control and adjustment operation.

Continuous production of polyester filaments

A segmented thermoplastic copolyetherester having soft segments formed from a long chain polyalkyleneether glycol containing 80 to 97 mole percent of copolymerized tetrahydrofuran and 3 to 20 mole percent of a copolymerized cyclic alkylene oxide, preferably copolymerized 3-methyltetrahydrofuran, provides fibers and films with an improved combination of high tenacity, high unload power, high melting temperatures and low set.

Thermoplastic copolyetherester elastomers

A continuous process is disclosed for direct esterification of terephthalic acid with ethylene glycol to form low molecular weight polyester with recovery of excess glycol from reaction off-gases. The terephthalic acid is mixed with an excess of glycol, the mixture is reacted at 280.degree.-315.degree. C. in reaction product circulated from a reactor through an external heater and back to the reactor, and reaction product is withdrawn from the reactor for polymerization to high molecular weight polyester. Vapors formed in the reactor are fed into the bottom of a rectification column where the excess glycol is recovered for direct reuse. The vapor feed is sprayed with condensate at 140.degree.-195.degree. C. in the bottom of the column to remove solids and maintain conditions suitable for obtaining less than 0.05 percent glycol in overhead distillate and 0.3 to 10 percent water in glycol condensate.

Growing community of inventors

Kinston, NC, United States of America

George R Goodley