Polyester composition for use in thermoforming dual-ovenable tra

Details Polyester composition for use in thermoforming dual-ovenable tra Polyester composition for use in thermoforming dual-ovenable tra

1996-01-02

1998-05-05

Short, Patricia A.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 3692, 525166, B29D 2200, C08L 6702

Patent

active

057471274

ABSTRACT:
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.

REFERENCES:
patent: 3639527 (1972-02-01), Brinkmann
patent: 3960807 (1976-06-01), McTaggart
patent: 4572852 (1986-02-01), Gartland et al.
patent: 5023137 (1991-06-01), Smith et al.

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