Heat-bondable laminates of polyester and metal foil and containe

Details Heat-bondable laminates of polyester and metal foil and containe Heat-bondable laminates of polyester and metal foil and containe

1980-05-21

1982-05-11

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Adhesive outermost layer

428 35, 428349, 428354, 428355, 428458, 428461, 428483, B32B 1500, B32B 1508

Patent

active

043293956

ABSTRACT:
Heat-bondable laminates of polyester (2) bonded to one surface of a metal (aluminium) foil (3) the other surface of which is bonded to a polyolefin heat-bondable layer (4). Laminates of this type are used to make food containers (1) to replace metal cans which are sterilized at 125.degree. C. The heat-bondable layer used hitherto has been high density polyethylene which has a melting point too close to 125.degree. C. and gives only barely adequate tear strength and impact resistance. The laminates of this invention use instead of the polyethylene, a sequential copolymer of propylene with 12 to 30% by weight ethylene and containers made from them achieve better tear strengths and impact resistances and can be sterilized at temperatures as high as 140.degree. C.

REFERENCES:
patent: 3386645 (1968-06-01), Powell
patent: 4096309 (1978-06-01), Stillman
patent: 4214321 (1980-07-01), Nuwayser

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