Verfahren zur Zurichtung von Leder und synthetischem Lederaustauschmaterial

摘要

1275773 Finishing leather BADISCHE ANILIN-& SODA-FABRIK AG 26 Sept 1969 [28 Sept 1968] 47538/69 Heading B2E [Also in Division C3] Leather or synthetic leather substitute is finished with polyurethanes by applying a solution of polyol (1) and polyisocyanate (2) in an organic solvent which is inert to isocyanate groups, and cross linking the polyols and polyisocyanates during and after evaporation of the solvent, the polyol (1) being a copolymer containing hydroxy groups comprising as comonomers a) 4-20% by weight with reference to all comonomers of units of an ethylenically unsaturated copolymerizable compound bearing at least one hydroxy group, b) 8.0-96% by weight of units of an ethylenically unsaturated copolymerizable compound which bears groups which do not react with isocyanate groups, and the polyisocyanate (2) being a high molecular weight polyisocyanate which is derived from 2, 4-toluylene diisocyanate and contains cyanurate groups and toluylene groups. The polyol (1) may further comprise as comonomers up to 13% by weight of units of dyes bearing at least one ethylenically unsaturated copolymerizable group e.g. azo, anthraquinone, azo metal complex dyes. Many examples of dyes are given. Suitable comonomers (a) are monoacrylates of ethyleneglycol, propanediol and butanediol-1, 4- monomethacrylates of ethyleneglycol, propanediol and butanediol-1, 4, vinyl-thioglycol and monovinyl ether of butanediol-1, 4. Suitable comonomers (b) are 1-8C alkyl esters of acrylic acid and methacrylic acid, acrylonitrile, methacrylonitrile, styrene, methyl vinyl ether, isobutyl vinyl ether, vinyl chloride and vinylidene chloride. The copolymers may be obtained by conventional solution polymerization. The polyisocyanates may contain 8-18% by weight of free isocyanate groups, and may be added to a solution of the copolymer (1) in the form of an organic solvent solution. The polyol may be present in stoichiometric or in excess amount with reference to the free isocyanate groups in the polyisocyanate. Plasticizers, pigments, flow improvers, delustrants, and binders e.g. phenoplast resins, aminoplast resins, alkyd, epoxide resins may be added to the solutions. The finishes are applied by spraying, brushing or padding.