Curl Resistant Laminate

摘要

1,155,612. Decorative laminate. MINNESOTA MINING & MFG. CO. 27 June, 1966, No. 28642/66. Heading B5N. A decorative sheet assembly comprises a decorative polymeric foil 11, a layer of pressuresensitive adhesive (12) and a releasable paperbased-liner (13), the liner being provided with a release coating (15) on the surface which contacts the adhesive, in which the decorated foil has a lower total hygroexpansion than the removably adhered liner, the exposed surface of the liner is provided with a substantially continuous moisture vapour retardant polymeric skin, and the adhesion of the pressure-sensitive adhesive to the liner and the constant stress modulus of the pressure-sensitive adhesive are chosen so that the assembly remains substantially flat when subjected to marked humidity change. The polymeric foil may be polymethyl methacrylate, polyvinyl chloride, polystyrene, a polyimide, a polycarbonate or biaxially oriented polyethylene terephthalate. The release coating is preferably a dimethylpolysiloxane cured through silanic hydrogen and the vapour retardant polymer may be a vinylidene chloride - acrylonitrile polymer, a polyester, polyethylene or ethyl cellulose. Suitable pressure sensitive adhesives are copolymers of 2-ethyl hexyl acrylate with acrylic acid, a phenol-formaldehyde resin modified copolymer of 2-ethyl butyl acrylate with acrylic acid, a copolymer of methyl iso-amylacrylate with fusel oil acrylate, a blend of butadiene-styrene rubber with natural rubber or a polyisobutylene.