Oriented saran coextrudate
AssigneeAmerican Can Company
InventorsGlenn C. Wiggins, Marvin J. Kreh, Robert S. Davis
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Abstract
An oriented two-layered laminate of vinylidene chloride-vinyl chloride copolymer as one layer and an ethylene-unsaturated ester type copolymer as the other layer. To this laminate may be adhered another polymer, also capable of being oriented, plastic sheet, paper sheet or board, metal or metal foil. Products such as pouches, chubs, formed troughs and the like can be made therefrom because the vinylidene chloride-vinyl chloride copolymer retains its orientation.
Claims9
A pouch comprising two sheets of a bilaterally oriented plastic laminate comprised of a first layer of a vinylidene chloride-vinyl chloride copolymer containing a predominant amount of vinylidene chloride in the copolymer molecule, and a second layer of an ethylene-unsaturated ester type copolymer containing a predominant amount of ethylene in the copolymer molecule and wherein said unsaturated ester is selected from the group consisting of vinyl acetate and isobutyl acrylate, said first layer and said second layer being non-separable with tape and said laminate being prepared by coextruding said first layer and said second layer as a plural layered tube, chilling said tube at a temperature of about 5.degree. C to about 25.degree. C and then tempering said tube at a temperature of about 20.degree. C to about 50.degree. C immediately prior to blowing said tube into a bubble with a fluid whereby the molecules of said copolymer are bilaterally oriented and wherein the total area of said bubble is at least about 16 times the area of said tube, said layer of vinylidene chloride-vinyl chloride of one laminate being joined to said layer of vinylidene chloride-vinyl chloride of the other laminate to form said pouch.
A plastic trough having wall and base portions formed of a bilaterally oriented plastic laminate comprised of a first layer of a vinylidene chloridevinyl chloride copolymer containing a predominant amount of vinylidene chloride in the copolymer molecule, and a second layer of an ethylene-unsaturated ester type copolymer containing a predominant amount of ethylene in the copolymer molecule and wherein said unsaturated ester is selected from the group consisting of vinyl acetate and isobutyl acrylate, said first layer and said second layer being non-separable with tape and said laminate being prepared by coextruding said first layer and said second layer as a plural layered tube, chilling said tube at a temperature of about 5.degree. C to about 25.degree. C and then tempering said tube at a temperature of about 20.degree. C to about 50.degree. C immediately prior to blowing said tube into a bubble with a fluid whereby the molecules of said copolymer are bilaterally oriented and wherein the total area of said bubble is at least about 16 times the area of said tube, said second layer forming the lining of said trough.
A wrapped cheese curing block comprising a block of cheese wrapped in a bilaterally oriented plastic laminate comprised of a first layer of a vinylidene chloridevinyl chloride copolymer containing a predominant amount of vinylidene chloride in the copolymer molecule, and a second layer of an ethylene-unsaturated ester type copolymer containing a predominant amount of ethylene in the copolymer molecule and wherein said unsaturated ester is selected from the group consisting of vinyl acetate and isobutyl acrylate, said first layer and said second layer being nonseparable with tape and said laminate being prepared by coextruding said first layer and said second layer as a plural layered tube, chilling said tube at a temperature of about 5.degree. C to about 25.degree. C and then tempering said tube at a temperature of about 20.degree. C to about 50.degree. C immediately prior to blowing said tube into a bubble with a fluid whereby the molecules of said copolymer are bilaterally oriented and wherein the total area of said bubble is at least about 16 times the area of said tube.
In a laminated structure:
- a bilaterally oriented plastic laminate comprised of a first layer of a vinylidene chloride-vinyl chloride copolymer containing a predominant amount of vinylidene chloride in the copolymer molecule, and a second layer of an ethyleneunsaturated ester type copolymer containing a predominant amount of ethylene in the copolymer molecule and wherein said unsaturated ester is selected from the group consisting of vinyl acetate and isobutyl acrylate, said first layer and said second layer being non-separable with tape and said laminate being prepared by coextruding said first layer and said second layer as a plural layered tube, chilling said tube at a temperature of about 5.degree. C to about 25.degree. C and then tempering said tube at a temperature of about 20.degree. C to about 50.degree. C immediately prior to blowing said tube into a bubble with a fluid whereby the molecules of said copolymer are bilaterally oriented and wherein the total area of said bubble is at least about 16 times the area of said tube;
- and a layer of material selected from the group consisting of paper, paperboard, metal and metal foil adherent to said plastic laminate.
A trapped label laminate comprising two sheets of a bilaterally oriented plastic laminate and a printed label therebetween, each of said sheets being comprised of a first layer of a vinylidene chloride-vinyl chloride copolymer containing a predominant amount of vinylidene chloride in the copolymer molecule, and a second layer of an ethyleneunsaturated ester type copolymer containing a predominant amount of ethylene in the copolymer molecule and wherein said unsaturated ester is selected from the group consisting of vinyl acetate and isobutyl acrylate, said first layer and said second layer being non-separable with tape and said laminate being prepared by coextruding said first layer and said second layer as a plural layered tube, chilling said tube at a temperature of about 5.degree. C to about 25.degree. C and then tempering said tube at a temperature of about 20.degree. C to about 50.degree. C immediately prior to blowing said tube into a bubble with a fluid whereby the molecules of said copolymer are bilaterally oriented and wherein the total area of said bubble is at least about 16 times the area of said tube, said first layers of said sheets being on the outside of said label laminate.
Dependencies are inferred from the claim text.