PROCESS FOR PREPARING PROMERIC MATERIALS ADAPTED FOR THE USE IN THE FOOTWEAR AND LEATHER GOODS FIELD

摘要

1340419 Porous coated materials SOC ITALIANA RESINE SIR SpA 30 June 1971 [1 July 1970] 30628/71 Heading B2E [Also in Division B5] Poromeric materials consist of non-woven fabric used as a backing, a coagulated foam intermediate layer and a micro porous polyurethane film attached to the intermediate layer, the intermediate layer being obtained by coagulating the foam obtained by entraining air in an aqueous latex having a polymer solids content of at least 45% by weight, the amount of air entrained being such that the volume ratio of latex air is from 2:1 to 1:2. The latex may comprise acrylic, methacrylic, vinyl, butadiene, styrene-butadiene or acrylonitrile polymers or copolymers of two or more of these monomers, or polyamides or polyurethanes. The films may be coagulated by heating, gelling, or irradiation. The poromeric materials may be produced by: a) spreading the foam onto a thin layer of micro-porous polyurethane film, coagulating the foam, and glueing a non-woven fabric under the surface of the coagulated foam; b) spreading the foam directly onto the non- woven fabric and applying the micro porous polyurethane surface coating, e.g. by glueing on a preformed micro porous layer or by forming the micro porous layer directly on the surface of the hardened foam, or by distributing small particles of polyurethane by a thousand-point stamping machine; or c) spreading the foam both onto the non-woven fabric and onto a thin layer of micro porous polyurethane film, drying the products and then combining them by rolling in a calender under heat with their foamy parts in contact. The fibres of the non-woven fabrics may be natural, e.g. cotton, wool or artificial, e.g. rayon or synthetic, e.g. polyamide, acrylic, polyester, alone or mixtures thereof.