Verfahren zur Herstellung vernetzter gummielastischer Faeden und Fasern

摘要

1,150,634. Polyurethane fibres. FARBENFABRIKEN BAYER A.G. 15 June, 1966 [15 June, 1965; 17 July, 1965], No. 26775/66. Heading C3R. Cross-linked polyurethane fibres are prepared by reacting a substantially linear polyhydroxyl compound of OH number 35 to 120 with a stoichiometric excess of a diisocyanate to form an isocyanate group-terminated prepolymer, reacting this prepolymer in a polar organic solvent at - 10‹ to 100‹ C. with 80 to 130% based on the NCO groups of a chain lengthening agent having a M.W. below 500 together with up to 50 mol per cent of a CO-chain lengthening agent which contains at least one tertiary nitrogen atom, so as to form a polyurethane solution containing at least 100 milli-equivalents of tertiary nitrogen per kilogram of elastomer, adding to this polyurethane solution an equivalent or less than equivalent quantity of a bis- or polyfunctional alkylating agent, forming the solution into fibres and allowing the product to cure. The polyhydroxyl compound may be a polyester, polyesteramide, polyether, polythioether or polyacetal whilst the diisocyanate may be aliphatic or aromatic, especially diphenylmethane-4,41-diisocyanate, the isomeric toluylene diisocyanates and hexamethylene diisocyanate. Suitable chain-lengthening agents are water, glycols, aminoalcohols, diamines, dihydrazides or hydrazine. The co-chain lengthening agents may be monomeric or polymeric, those exemplified being N,N1-bis-#-hydroxyethyl piperazine; N,N1-bis- (γ-aminopropyl)- N,N1 - dimethylethylenediamine; bis - (# - hydroxypropyl1)-methyl amine; a polymer prepared by self-condensation of bis-(#-hydroxypropyl)-methylamine; a polymer prepared by self-condensation of N - cyclohexyldiethanolamine; and a polymer prepared by reacting 1,6- hexane diol with N-butyl-diethanolamine. Preferred bis- or polyfunctional alkylating agents are organic halogen compounds especially 4,41- bis - (chloromethyl) - diphenyl ether; 1,3 - dimethyl - 4,6 - di - (chloromethyl) - benzene and p-xylylene dichloride. The solvents used may be dimethylformamide, dimethylacetamide, dimethylsulphoxide or dimethoxydimethylacet. amide, if desired in admixture with up to about 20% by weight of other solvents such as dioxane, tetrahydrofuran or chlorobenzene. Heattreatment of the fibres at 50-150‹ C. allows the quaternating reaction between the bis- or polyfunctional alkylating agents and tertiary nitrogen atoms of the polyurethane chains to take place.