Shell Oil Comapny

The Goodyear & Tire Rubber Company

Jack Edward Prince

Paul R Ginnings

This invention relates to a thermoplastic resin composition which is particularly suitable for use in thermoforming thin-walled articles, such as dual-ovenable trays. Articles which are made utilizing this thermoplastic resin composition have improved low-temperature impact strength. This thermoplastic resin composition is comprised of (a) from about 86 weight percent to about 98 weight percent polyethylene terephthalate having an intrinsic viscosity of at least about 0.7 dl/g; (b) from about 1 weight percent to about 7 weight percent of a polyethylene ionomer; and (c) from about 1 weight percent to about 7 weight percent of a polyolefin with repeat units derived from olefin monomers containing 2 to 6 carbon atoms, wherein the thermoplastic resin composition contains an effective amount of a heat stabilizer. The subject invention also includes thermoforming such thermoplastic resin compositions into thin-walled articles having a crystallinity of from about 10 percent to about 40 percent.

Polyester composition for use in thermoforming dual-ovenable trays

The invention provides for a process for inducing immediate high slip properties in a silicone modified, unorientated polyester. The process comprises heating the polyester film, article, etc., in a fluid at a temperature of from about 70.degree. C. to about 200.degree. C.

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North Canton, OH, United States of America

Jack Edward Prince