Method of preparing oxygen impermeable film laminate

Abstract

Abstract Impermeable plastic film laminates for use in the packaging of food products and other materials are formed by an improved method in whether polyethylene or other plastic films are laminated to plastic films such as nylon, polyester, cellophane, polypropylene, polyethylene, polyvinyl chloride, etc., by adhesive lamination with an oxygen and moisture vapor impermeable saran-containing adhesive, the adhesive preferably including a polymeric polyisocyanate. The polyethylene 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 films 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.

Inventors

• 👤 S Manne
• 👤 M Beyer

Bibliographic Details