Heat-sealing sheet material

Food or edible material: processes – compositions – and products – Packaged or wrapped product – Three or more layered diverse packaging materials having at...

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215232, 215347, 215349, 426106, 428 35, 428232, 428347, 428349, B65D 8500, B65D 5300, B32B 1508, B32B 2700

Patent

active

043905528

ABSTRACT:
A heat-sealing sheet material can be obtained by forming, on one side of a sheet base material such as aluminum foil, a sealant layer composed of a graft copolymer comprising a trunk polymer of a 20 to 60% saponification product of an ethylene/vinyl acetate copolymer having a vinyl acetate content of 15 to 45% by weight and a branch polymer of an unsaturated carboxylic acid in a proportion of 10% by weight or less of the partially-saponified product. This sheet material exhibits excellent heat-sealing strength with respect to glass containers, and, moreover, there is almost no decrease in the sealing strength even when the material has been in contact with water. Accordingly, the sheet material is suitable as a sealing material for the opening rims of glass containers for water-containing food products such as jams and pickles.

REFERENCES:
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patent: 4209126 (1980-06-01), Elias
patent: 4240993 (1980-12-01), Sun
patent: 4260438 (1981-04-01), Dembicki et al.
patent: 4281045 (1981-07-01), Sumi et al.
patent: 4332846 (1982-06-01), Fischer et al.
patent: 4349644 (1982-09-01), Iwanami et al.

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