The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 1986
Filed:
Oct. 20, 1983
Theodore J Lang, Kingston, CA;
Du Pont Canada Inc., Mississauga, CA;
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.