| 摘要 |
1,119,664. Laminates. FARBENFABRIKEN BAYER A.G. 20 July, 1965 [28 July, 1964], No. 30846/65. Heading B5N. An elastic non-woven fibrous sheet material is made by preparing a mat from elastic fibres prepared by reacting an NCO-terminated prepolymer of a polyhydric compound and a di-isocyanate with a chain-extending agent, embedding the mat between two layers of cellulosic, polyamide, polyester or polyacrylonitrile staple fibres, the fibres all being carded in layers, and consolidating the formed multilayer material. The polyhydric compound may be a polyester or polyether, and the chainextending agent may be a diamine, a hydrazide, a glycol or water. Cellulosic fibres, if used may be of cuprammonium cellulose. The polyurethane fibres may be treated with lubricants, e.g. talcum or amides, esters or sodium salts of fatty acids. The fleece may be consolidated by binders or plasticizers or by needling. Adhesive binders referred to are polymers of esters of acrylic acid and its derivatives, vinyl polymers, natural rubber, polymers and copolymers of butadiene, polyesters having their chains extended by reaction with an isocyanate and polyurethane. They may be introduced in aqueous dispersion or aqueous or organic solution, or incorporated as thermoplastic fibres, powders, granules or shavings of, e.g., polyethylene, polyvinyl chloride or polyamide followed by welding. The products may be used as acoustic tiles, filter cloths, floor mats, furniture and car upholstery and plasticsreinforcing members. |
