| 摘要 |
840,900. Agglutinated fibrous materials; laminates. ROHM & HAAS CO. Aug. 6, 1957 [Aug. 13, 1956], No. 24722/57. Class 140. A bonded non-woven fibrous product consists of fibres, which are predominantly non- proteinaceous and incapable of felting, distributed in random away and bonded together by a binder formed from a water-insoluble linear polymer of monoethylenically unsaturated monomeric units comprising 0.5 to 10% by weight of units containing carboxyl (-COOH) groups which binder is free of polyvalent metal salts. Specified fibres are glass, mineral wool, jute, sisal, ramie, hemp, cotton; cellulose acetate, polyacrylonitrile; copolymers of acrylonitrile with vinyl chloride, vinyl acetate, methacrylonitrile or vinyl pyridine; nylon and ethylene, glycol-terephthalate polymers. The fibres may be formed into a mat by carding or air-deposition. The binder may be applied in free acid form, or in the form of an alkali metal salt, an ammonium salt or a salt of a water-soluble amine. Application of the binder is by impregnation with powder or with an aqueous dispersion. The binder may be obtained by emulsion polymerization of monomers containing carboxyl groups with other monoethylenically unsaturated co-monomers. Specified co-monomers are primary and secondary alkyl acrylates or methacrylates, vinyl esters of saturated monocarboxylic esters of over two carbon atoms, tertiary amyl methacrylate, tertiary butyl or tertiary amyl acrylate, cyclohexyl or benzyl acrylate or methacrylate, acrylonitrile, methacrylonitrile, styrene, vinyl chloride, chlorostyrene, vinyl acetate, p-methylstyrene, acrylamide and methacrylamide. The binder dispersion may be applied to the fibres after formation of the web or may be applied, by spraying, to the fibres as they fall through the settling chamber in the case of air deposition. The binder may be insolubilized by heating. An aminoplast such as urea- or melamine-formaldehyde may be mixed with the binder or applied in a separate operation. The bonded fibrous sheets may be impregnated with an unsaturated polyester resin dissolved in styrene and cured to form moulded articles, or may be incorporated into laminates either as interlayers or backing sheets in conjunction with plastic films or sheets, of polyethylene or nylon, or with textile fabrics of woven, braided, knitted, knotted or felted character. Examples describe the making of bonded fibrous material using glass fibres or mixtures comprising viscose, acetate, nylon, acrylonitrile or cotton fibres. |
