Heat-sealed closure for polyester container

Details Heat-sealed closure for polyester container Heat-sealed closure for polyester container

1993-01-05

1998-02-24

Buffalow, E. Rollins

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

220200, 428344, 428349, 428416, B29D 2200

Patent

active

057210284

ABSTRACT:
The present invention provides a strong heat seal to a thermoplastic polyester container which can withstand hot water treatment such as retorting, and to a heat sealed container. A heat-sealable closure is also provided. It is composed of a laminate consisting of a heat-seal layer comprising as a main component a copolymerized polyester resin having a softening temperature of 120.degree. C. and a glass-transition temperature of 30.degree. to 85.degree. C., a metal substrate, and an epoxy-phenol resin primer layer interposed between them.
Preferably, the container has a heat seal portion composed of a thermoplastic polyester having a fusion temperature in the crystalline state of at least 200.degree. C. This polyester portion is oriented and crystallized or heat-crystallized.

REFERENCES:
patent: 4310578 (1982-01-01), Katsura et al.
patent: 4765999 (1988-08-01), Winter
patent: 4915289 (1990-04-01), Hatano et al.
patent: 4921764 (1990-05-01), Rudd et al.
patent: 4946743 (1990-08-01), Winter

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