Thermoforming partially crystalline polyester articles

Patent 4572852 Issued on February 25, 1986. Estimated Expiration Date:

November 5, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3285855

3644482

3673139

Thermoformed polyester articles having impact resistance and high temperature dimensional stability
Patent #: 3960807
Issued on: 06/01/1976
Inventor: McTaggart

Stabilized polyester compositions
Patent #: 3987004
Issued on: 10/19/1976
Inventor: Georgoudis

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Patent #: 3989664
Issued on: 11/02/1976
Inventor: Kawase , et al.

Polyester-polyolefin blend film or coating composition
Patent #: 4046837
Issued on: 09/06/1977
Inventor: Carroll, Jr.

Polymeric molding compositions having the high impact strength
Patent #: 4327198
Issued on: 04/27/1982
Inventor: Weemes , et al.

Films from compositions of polyesters and olefine polymers
Patent #: 4368295
Issued on: 01/11/1983
Inventor: Newton , et al.

Thermoforming partially crystalline polyester articles Patent #: 4463121
Issued on: 07/31/1984
Inventor: Gartland , et al.

Inventors

Assignee

The Goodyear Tire & Rubber Company

Application

No. 06/668061 filed on 11/05/1984

US Classes:

428/36.92, Single layer (continuous layer)428/480, Of polyester (e.g., alkyd, etc.)525/177Solid polymer derived from ethylenic reactants only derived from unsaturated hydrocarbon

Examiners

Primary: Herbert, Thomas J. Jr.

Attorney, Agent or Firm

Thompson; R. D.

International Classes

C08L 67/00 (20060101)
C08L 67/02 (20060101)

Abstract

Thin walled thermoformed articles of partially crystallized polyethylene terephthalate containing a minor component of a polyolefin which exhibit improved impact resistance and high temperature dimensional stability are disclosed herein. A method for thermoforming such articles using polyethylene terephthalate/polyolefin blends which provides improved mold release is also revealed.