Multilayer structure and easily openable container and lid

Details Multilayer structure and easily openable container and lid Multilayer structure and easily openable container and lid

1989-04-17

1990-11-13

Seidleck, James

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428402, 428516, B32B 516

Patent

active

049701134

ABSTRACT:
A multilayer structure comprising (C) a substrate layer, (A) a surface layer of a thermoplastic resin, and (B) an intermediate layer of a thermoplastic resin sandwiched between the (C) substrate layer and the (A) surface layer, wherein the (B) intermediate layer contains 0 to 70% by weight of a flake inorganic filler, the peeling strength between the (A) surface layer and the (B) intermediate layer is from 0.3 to 2.0 kg/15 mm, and the peeling strength between the (B) intermediate layer and the (C) substrate layer is at least 1.2 times as large as the peeling strength between the (A) surface layer and the (B) intermediate layer. When a packaging container is produced by forming the multilayer structure into a container body and sealing the container body with a lid, easy openability and high sealing property will be ensured because the opening of the packaging container is not operated by using the delamination between the sealed portion but by using the easy delamination between the surface layer (A) and the intermediate layer (B). The use of the multilayer structure for production of packages is economically advantageous because the recovered scrap can be reused as the material for the substrate layer (C) without affecting the peelability of the surface layer (A).

REFERENCES:
patent: 4302554 (1981-11-01), Nabeta et al.
patent: 4470514 (1984-09-01), Dronet
patent: 4521467 (1985-06-01), Berger
patent: 4656068 (1987-04-01), Raines
patent: 4673601 (1987-08-01), Lamping
patent: 4810541 (1989-03-01), Newman et al.
patent: 4859514 (1984-08-01), Friedrich et al.

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