| 摘要 |
823,962. Suede-like agglutinated-fibre materials; laminates; coated fabrics. DU PONT DE NEMOURS & CO., E. I. June 18, 1956 [July 27, 1955], No. 18855/56. Drawings to Specification. Class 140. A sheet material comprises at least one base layer of matted structural fibres and a surface layer of fibres of length 5 to 15 mils., the base and surface layers and the fibres thereof being bonded together by an extensible polymeric binder and some or all of the fibres in the surface layer being raised to give a suede-like finish. The sheet material is formed by hot-pressing the fibrous layers which are either interleaved with sheets of thermoplastic binder or are impregnated therewith, and the surface layer containing the short fibres is abraded to remove the binder and so give a suede finish. Suitable binders are vinyl and vinylidene polymers and copolymers (including synthetic rubbers and polythene) which may be halogenated, polyesters, polyamides, and polyurethanes, and may be used in conjunction with plasticizers. Natural or man-made fibres may be used, e.g. a blend of rayon and nylon, but preferably the binder used is different from the fibre and that used in the top layer may be different from that in the other layers, e.g. to provide a hard top layer. Colour may be imparted to the top layer either by including dyes or pigments in the binder or by dyeing the fibres before impregnating them with binder or a binder and colour coating may be applied, and an outer " depth " binder coating containing less plasticizer than in the other layers may be applied. The material may be made porous either by stretching it or by swelling the fibres as by a water dip to rupture the bond between fibres and binder or by extracting solvent-soluble pore-forming fibres, e.g. cellulose acetate, included in the sheet material. Examples are given of the production of multilayer porous sheets using neoprene as binder and nylon fibres in all the layers or polyethylene terephthalate in the top fibrous layer only. Specifications 553,733, [Group IV], 711,279, 711,280, [both in Group IX], 737,137, 751,017, 763,604 and 782,952 are referred to. |
