Stock material or miscellaneous articles – Composite – Of polyamide
Patent
1983-10-20
1986-01-21
Herbert, Thomas J.
Stock material or miscellaneous articles
Composite
Of polyamide
427316, 427379, 4273855, 4274121, 4274123, 4274125, 428483, 428515, 428518, B32B 2708, B05D 302
Patent
active
045657424
ABSTRACT:
A film laminate comprising a base film and a first sealant web with a coating of polyvinylidene chloride (PVDC) sandwiched therebetween is disclosed. The first sealant web is selected from the group consisting of (a) film made from a copolymer of ethylene and vinyl acetate, and (b) a film made from a blend of (i) a copolymer of ethylene and vinyl acetate with (ii) a homopolymer of ethylene, or a copolymer of ethylene and one or more C.sub.4 to C.sub.10 .alpha.-olefins, said homopolymer or copolymer having a density of from about 0.915 to about 0.955 g/cm.sup.3, or blends of said homopolymer and copolymer. The base film is selected from the group consisting of oriented nylon film, oriented polyester film, oriented polypropylene film and a second sealant web, said second sealant web being selected from the same group as said first sealant web and having a slip coefficient of less than about 0.4. The PVDC coating consists of at least one layer, the layers being characterized by having a crystallinity index of less than 1.15 if dried and allowed to stand for 30 days at 20.degree. C. and, if the base film is selected from nylon film, polyester film or polyproylene film, the layer in contact with the base film being further characterized by having a crystallinity index of from 1.12 to 1.25 if dried and allowed to stand for 5 days at 40.degree. C. A process for forming the laminate is also disclosed. The process comprises bringing the base film and the first sealant web together between a nip roll and a hot roll, said PVDC coating having been applied to at least the base film or the first sealant web, with the provisio that if the first or second sealant web is in contact with the hot roll then said web which contacts the hot roll has a slip coefficient of less than about 0.4. The laminates may be used for packaging comestibles e.g. bacon, weiners and cheese.
REFERENCES:
patent: 3741253 (1973-06-01), Brax et al.
patent: 4188443 (1980-02-01), Mueller et al.
patent: 4399181 (1983-08-01), Yoshimura et al.
patent: 4452842 (1984-06-01), Borges et al.
R. A. Wessling, "Polyvinylidene Chloride", Publ. by Gordon and Breach Science Publishers, New York, 1977, pp. 1-5, 172-185.
Du Pont Canada Inc.
Herbert Thomas J.
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