Title: Heat-bondable laminates of polyester and metal foil and containers made from them

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° C. The heat-bondable layer used hitherto has been high density polyethylene which has a melting point too close to 125° 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° C.

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Inventors: Pickford, Nigel E. (Welwyn, GB2)

Application Number: 06/151894
Filing Date: 1980-05-21
Publication_date: 1982-05-11
Assignee: ICI LTD

Primary Class(es): 428/344 428/461, 428/483, 428/458, 428/354, 428/349, 428/355N
Other Classes: B32B15/08; B65D75/26; B32B15/00; B32B15/08
US Patent Ref:

3386645	June, 1968	Powell	Packaging sheet material
4096309	June, 1978	Stillman	428/285	Laminated packaging material
4214321	July, 1980	Nuwayser	428/458	Glove for use with organic solvents

Other Refs: EP0021578JP56-28855GB1453621GB1503258

January, 1981	428/35	Heat-bondable laminates of polyester and metal foil and containers made from them.
March, 1981	428/35
October, 1976
March, 1978

Primary Examiner: Lesmes, George F.
Assistant Examiner: Buffalow, Rollins E.
Attorney: Cushman, Darby & Cushman

Parent Case Data:

This application is a continuation-in-part of Ser. No. 094,192, filed Nov. 14, 1979, now abando