Laminates, methods of making them and Laminated Articles Prepared therefrom

摘要

1,162,225. Laminated synthetic resin films; seaming non-metallic sheet material. STANDARD OIL CO. 10 Aug., 1966 [11 Aug., 1965], No. 35799/66. Headings B5K and B5N. [Also in Divisions B2 and B8] A method of making a laminate comprises coating a surface of a biaxially orientated acrylonitrile polymer film consisting of an acrylonitrile homopolymer or of a copolymer of acrylonitrile with up to 5% by weight of at least one polyalkenyl monomer with an adhesive comprising (1) a mixture of a hydroxyl-terminated polyester and a polyisocyanate or (2) a blend of a copolymer of vinyl acetate and acrylic acid with a copolymer of ethylene and vinyl acetate, or (3) a polyurethane made by reacting 1: 6-hexamethylene diisocyanate and tolylene diisocyanate with trimethylol propane and a cellulose acetate-butyrate polymer having residual hydroxy groups, applying to the adhesive-coated surface of the acrylonitrile polymer film a film of a polyolefine which consists of a polymer of an alpha-olefine having the structure where R is hydrogen or C 1 to C 6 alkyl group; and bonding the two films together optionally with heat setting and/or curing of the adhesive during the bonding step. Many polyalkenyl monomers are disclosed. Specified polyolefines which may be melt-extruded into contact with the adhesive are the homo- and co-polymers of ethylene and propylene, polybutenes, polypentenes, polyheptenes and polyhexenes. The surfaces of the films may be pretreated, e.g. with a gaseous mixture of BF 3 and an oxidizing agent or an oxidizing agent or by the application thereto of flame or corona discharge prior to bonding. Articles, e.g. packages, may be made by the heat sealing of the polyolefine films and examples the folding and edge heat-sealing of laminates to form pouches. The laminates or the articles may be attached to foam layers or to woven or non-woven fabrics.