LEATHER-LIKE, THREE LAYER LAMINATE AND PROCESS OF MAKING SAME

摘要

1293874 Laminated products UNIROYAL Inc 24 Feb 1970 [26 Feb 1969] 8732/70 Addition to 1034988 Heading B5N A leather-like three-layer laminate comprises a base layer of fabric, an intermediate cellular layer of blown polyurethane and a surface layer of polyurethane, the material of the intermediate and surface layers defining a multiplicity of interconnecting voids to give gas permeability, the voids containing particles of an incompatible thermoplastic resin such as polyethylene, polypropylene or wax. The laminate is made by forming the surface layer, usually on a casting surface such as paper which may be silicone-coated, from a uniform mixture of a fluent polyurethane film-forming material and an incompatible thermoplastic resin, forming on this layer the intermediate layer from a similar mixture but also containing a blowing agent, the incompatible resin in each layer being in a physical form (e.g. powder) having an apparent density less than its actual density, applying a fabric to the surface of the intermediate layer, heating the entire composite to fuse the two layers into a unitary film bonded to the fabric and rendering the body layer cellular by substantially simultaneously decomposing the blowing agent and melting the incompatible material in the two layers. The fabric backing may be knitted or woven natural or synthetic fibres. The minute voids in the polyurethane layers may be made more open by kneading or staking.. The surface of the laminate may be given an overall slip finish in diamond-shaped deposits by means of a discontinuous print roller and may be subsequently embossed.