Shell Oil Comapny

The Goodyear & Tire Rubber Company

Walter Francis Johnston

Kevin L Rollick

John Michael Scoarste

Deborah A Tung

William George Perkins

Donald E Richeson

Deborah Ann Snell Tung

Richard Robinson Smith

Compositions of polycondensed branched polyester polymers and aromatic polycarbonates, and the closed cell polymer foams made therefrom

A foamable polyester composition comprising a combination of blowing agent and mixed polymer composition comprising:

Compositions of polycondensed branched polyester polymers and aromatic

This invention is a composition, a kit to prepare the composition, cellular sheet made from the composition and thermoformed articles made from the sheet, in which the composition comprises polyethylene terephthalate, sufficient inert gas to give a sheet density of 0.4 to 1.25 gm/cc, a polytetrafluoroethylene nucleating agent and optionally a polyolefin additive and a heat stabilizer.

Cellularized polyesters

This invention is a composition and a kit to prepare the composition and articles made from the composition, which composition comprises polyethylene terephthalate, a nucleating agent having a defined Nucleation Index and optionally a polyolefin and a heat stabilizer. A particularly effective nucleating agent is polytetrafluoroethylene.

Nucleation of crystallization in polyesters

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. These thermoplastic resin compositions are comprised of (a) from about 92 to about 99 weight percent polyethylene terephthalate having an intrinsic viscosity of from at least about 0.7 dl/g; (b) from about 1 to about 8 weight percent of a polyethylene ionomer; and (c) optionally an effective amount of a heat stabilizer. The subject invention also deals with thermoforming such thermoplastic resin compositions into thin walled articles having a crystallinity within the range of about 10% to about 40%.

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Tallmadge, OH, United States of America

Walter Francis Johnston