| 摘要 |
<p>1,159,341. Coated laminate. GENSET CORP. 19 Aug., 1966 [14 Sept., 1965], No. 37264/66. Heading B2E. [Also in Division B5] A composite sheet comprises a flexible, compressed, cellular polyurethane sheet of open or closed cell structure, a fibrous mat e.g. of natural or synthetic fibres being adjacent to one or each surface of the polyure. thane sheet and a plurality of the fibres of the fibrous mat or mats penetrating said polyurethane sheet. When the composite sheet contains only one fibrous mat, the opposed surface of the polyurethane sheet may be coated with a flexible polymer e.g. a polyurethane, a polyacrylate, a polyester, a polyamide or an epoxy resin. The mats may be woven or non- woven, may be unbonded or the fibres may be bonded by adhesive, by thermoplastic fibres, solvent or salt, specified fibres being rayon, silk, wool, nylon, polyethylene terephthalate, polydimethyl cyclohexyl terephthalate, polyacrylonitrile, polyvinyl chloride and polyvinyl alcohol. A preferred method of forming the composite sheets comprises forming a cellular polyurethane sheet, placing a fibrous mat adjacent to one or each surface thereof, physically forming a plurality of the fibres of the mat(s) into the polyurethane e.g. by needling and compressing the resultant composite at a temperature and pressure sufficient to produce a permanently compressed sheet. The coating may be applied to the polyurethane prior to needling or after compression. Needling is preferably effected so that at least some ot the fibres pass through the thickness of the polyurethane sheet and project therefrom. The polyurethane sheet may be composed of two separate layers, the fibrous mat being needled to one layer thereof and the resultant composite needled to the other layer. The com posite sheets may be provided with finish coat. ings on one or both surfaces or laminated together.</p> |
