Verfahren zur Herstellung von dampfdurchlaessigen blatt- oder bahnfoermigen Materialien

摘要

1,221,372. Laminates. TORAY INDUSTRIES Inc. 4 Oct., 1968 [13 Oct., 1967], No. 47150/68. Heading B5N. [Also in Division B2] A laminate is produced by forming a vapour permeable sheet-like material by coating a solution of film-forming polymeric material on to a support material, applying to the socoated surface a gas stream flowing at a speed in the range of from 1 m/sec. to 50 m/sec., thereafter subjecting the polymeric material to a coagulating treatment with a liquid containing a non-solvent of both the support material and the polymeric material, the gas stream being so applied that a dense gelated layer is formed on the surface by the subsequent coagulating treatment, removing the solvent from and drying the polymeric material, and either larninating an artificial leather substrate to the coating and stripping off the support material; or stripping the film coating from the support material and laminating the film to an artificial leather substrate. The artificial leather substrate may be a needle punched nylon fibre web soaked in butadiene-acrylonitrile and coated with a polyurethane adhesive. The coagulation treatment may be effected by immersing the coated material in a liquid e.g. water, the liquid being at least partially miscible with the solvent e.g. dimethyl formamide, dimethyl sulphoxide, dioxane, dimethyl acetamide, tetrahydrofuran,γ- butyrolactone, pyrrolidone, or cyclohexanone, used in the film-forming polymer solution but being a non-solvent for the polymeric material. The gas stream may be applied for at least 5 seconds; the gas may be air, nitrogen or carbon dioxide. The film-forming polymer may be a polyurethane; polyamide e.g. nylon; polyvinyl chloride; a copolymer of vinyl chloride e.g. with vinyl acetate, methyl vinyl ether, acrylates; or a mixture thereof. The support material may be a woven fabric e.g. a nylonrayon flannel; non-woven cloth e.g. needle punched nylon fibre web soaked in butadieneacrylonitrile, or polyester fibre web soaked in polyurethane; knitted fabric; paper; plastics film e.g. polyester film; metal foil; or the inner layers of hides from split natural leather. The coating may be applied by doctor blade, reverse roll, curtain, slit die, casting boxes or dip-coaters.