OXYGEN IMPERMEABLE FILM LAMINATE

• US 3,622,439 A
• Filed: 05/23/1968
• Issued: 11/23/1971
• Est. Priority Date: 05/23/1968
• Status: Expired due to Term

• Current Assignee: Teepak Investments, Inc.
• Original Assignee: Myron S. Beyer, Stanley Manne
• Inventors: Manne, Stanley, Beyer, Myron S.
• Primary Examiner(s): Goolkasian, John T.
• Assistant Examiner(s): Cosby, C. B.
• Application Number:
  US04/731,563
• Time in Patent Office: 1,279 Days
• Field of Search: 161/190,231,227,251,254,184 260/859R,83P
• US Class Current: 428/414
• CPC Class Codes: B32B 2038/0076 Curing, vulcanising, cross-linking
• CPC Class Codes: B32B 23/08 of synthetic resin
• CPC Class Codes: B32B 2307/7244 Oxygen barrier
• CPC Class Codes: B32B 2307/7246 Water vapor barrier
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08L 27/04 containing chlorine atoms
• CPC Class Codes: C09J 175/00 Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
• CPC Class Codes: Y10S 220/11 Materials
• CPC Class Codes: Y10T 428/31515 As intermediate layer
• CPC Class Codes: Y10T 428/31536 Including interfacial reaction product of adjacent layers
• CPC Class Codes: Y10T 428/31562 Next to polyamide [nylon, etc.]
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/3158 Halide monomer type [polyvinyl chloride, etc.]
• CPC Class Codes: Y10T 428/31587 Hydrocarbon polymer [polyethylene, polybutadiene, etc.]
• CPC Class Codes: Y10T 428/31591 Next to cellulosic
• CPC Class Codes: Y10T 428/31743 : Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/31797 : Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31909 : Next to second addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31928 : Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31938 : Polymer of monoethylenically unsaturated hydrocarbon

Abstract

Impermeable plastic film laminates for use in the packaging of food products and other materials are formed by adhesive lamination of polyethylene or other plastic films to plastic films such as nylon, polyester, cellophane, polypropylene, polyehtylene, polyvinyl chloride, etc., by adhesive lamination with an oxygen and moisture vapor impermeable saran-containing adhesive, the adhesive preferably including a polymeric polyisocyanate. The polyehtylene portion of the laminate provides for heat sealability of the resulting film laminate. The nylon, polyester, cellophane, polypropylene, etc., film gives flex strength, abrasion resistance, gloss, vacuum formability, etc., to the film laminate. The saran adhesive gives an impermeable film laminate upon curing. In the manufacture of the film laminate, a pressure sensitive but curable saran adhesive is applied to one of the plies of the film laminate on an ordinary plastic film coater or printing press and the two film combined and rolled up on a windup reel. The pressure applied to the film laminate in the windup reel is the laminating force applied to the film and the film laminate is cured simply by being stored under pressure of being wound on the rolls. After curing of the saran adhesive, the plastic film plies cannot be easily separated.

Claims

2. An article in accordance with claim 1 in which said first plastic film ply is nylon, polyester, polypropylene, polyethylene or cellophane, and said second plastic film ply is surface-treated polyethylene.

3. An article as defined in claim 2 in which the pressure sensitive saran-containing adhesive includes a polymeric polyisocyanate.

4. An article as defined in claim 2 in which said saran-containing adhesive includes a polyester.

5. An article as defined in claim 2 in which said saran-containing adhesive includes an epoxy resin.