Seam covered welded can

Details Seam covered welded can Seam covered welded can

1986-09-02

1988-04-05

Kittle, John E.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428458, 220 75, 220456, 220458, 426131, B65D 2302

Patent

active

047358351

ABSTRACT:
Disclosed is a welded can having at least the inner face side of a weld seam covered with a composite film of a thermoplastic resin, wherein the thermoplastic resin composite film comprises (I) an innermost layer, located on the inner face side of the can, of a thermoplastic polyester having a molecularly oriented crystal and comprising a dibasic acid component content of at least 90 mole % of terephthalic acid and a diol component containing at least 90 mole % of ethylene glycol, said innermost layer (I) overlayer (II) a seam-contacting layer, located on the seam side, of a thermoplastic copolyester containing in the chain molecule a dibasic acid component containing 40 to 95 mole % of terephthalic acid and 0 to 40 mole % of isophthalic acid and a diol component containing ethylene glycol and butane diol in a total amount of 65 to 100 mole % at a molar ratio of from 5/95 and 80/20 or a blend of such copolyesters, and the composite film comprising the layers (I) and (II) has an elasticity modulus of 5 to 220 kg/mm.sup.2 at a temperature lower by 20.degree. C. than the softening temperature of the resin of the layer (II).

REFERENCES:
patent: 4339483 (1982-07-01), Ueno et al.
patent: 4382525 (1983-05-01), Kobayashi et al.
patent: 4387830 (1983-06-01), Kitamura et al.
patent: 4477501 (1984-10-01), Kojima et al.

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