Heat-weldable composite films and method of production thereof

Details Heat-weldable composite films and method of production thereof Heat-weldable composite films and method of production thereof

1994-03-22

1996-11-26

Nakarani, D. S.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

1563317, 427402, 428347, 428349, 428412, 4284235, 4284237, 4284242, 4284244, 4284246, 4284247, 4284248, 4284735, 4284744, 428480, 428483, 428510, 428516, 428518, 428533, 428910, B32B 712, B32B 2730, C08F 1408, C08J 518

Patent

active

055783724

ABSTRACT:
Composite films have a layer structure comprising a base film, and a coating layer containing a vinylidene chloride polymer, a laminating agent layer composed of a polyisocyanate component and a polyol component, and a polymer film as laminated in that order on at least one side of the base film. The vinylidene chloride polymer is a copolymer having a vinylidene chloride content of 91 to 94% or a copolymer having a weight average molecular weight of 7.5.times.10.sup.4 to 20.times.10.sup.4. By using such copolymer, the transparency and gas barrier properties can be prevented from decreasing and the heat-sealed portions from whitening. The base film includes nylon films, among others. The base film may also be a stretched or oriented one. The polymer film includes heat-weldable films.

REFERENCES:
patent: 3297518 (1967-01-01), Maschner et al.
patent: 3514367 (1970-05-01), James
patent: 3622439 (1971-11-01), Manne et al.
patent: 3887757 (1975-06-01), Stone et al.
patent: 4410595 (1983-10-01), Matsumoto et al.

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