Patent GB-1083625-A (GB)
Title: Felted textile materials
Inventor: KLEBERT WOLFGANG
IPC: D06M15/564
Filed: 1966-04-05
Abstract: A composition suitable for use in the production of felted textile materials comprises an aqueous liquor which contains (a) a polymer or copolymer derived from vinyl or divinyl monomers and (b) a reaction product containing isocyanate groups prepared by reacting a compound of molecular weight 500-6000 having at least two hydroxyl groups with a polyisocyanate.  Suitable vinyl or divinyl monomers from which the polymers or copolymers (a) are derived are ethylene, propylene, vinyl chloride, vinyl acetate, vinyl ethyl ether, styrene, divinyl benzene, butadiene, isoprene, chloroprene, acrylic and methacrylic acids and their nitriles, esters and amides including their N methylol amides or derivatives thereof prepared by reaction with alcohols containing at least one further functional group. The compound of molecular weight 500-6000 which carries at least two hydroxyl groups used to prepare the reaction product (b) may be a polyethylene glycol, polypropylene glycol, polybutylene glycol, polyhexylene glycol, a polythioether obtainable by condensing thiodiglycol with itself or with sulphur-free polyalcohols or a polyester obtained from an aliphatic dicarboxylic acid, e.g. succinic, adipic, sebacic or maleic acid, and a glycol, e.g. ethylene glycol, diethylene glycol, propylene glycol, butane diol or neopentyl glycol and the diisocyanate used to prepare the reaction product (b) maybe tetramethylene - diisocyanate, hexamethylene diisocyanate, cyclohexane - 1,4 - diisocyanate, dicyclohexyl - methane - 4,41 - diisocyanate, hexahydrotoluylene - 2,4- or 2,6 - diisocyanate, p - phenylene - diisocyanate, toluylene - 2,4- or -2,6-diisocyanate or OCN-(CH2)6-N-[-CONH-(CH2)6-NCO]2. The weight ratio of (a) to (b) is preferably 0.25-4:1 and the aqueous liquor may contain 5-70% by weight of (a) and (b).  In the examples the aqueous liquors contain (1) a copolymer of acrylic acid butyl ester, butadiene and methacrylic acid amide and an aqueous emulsion containing reaction product of 2,4-toluylene-diisocyanate and a branched polypropylene glycol having a molecular weight of 3750 obtained by propoxylation of trimethylol propane, ethyl acetate and lauryl sulphate, (2) a copolymer of acrylic acid butyl ester, methacrylic acid methyl ester and methacrylic acid amide and an aqueous emulsion containing the reaction product of polypropylene glycol having a molecular weight of about 2000 and hexamethylene-diisocyanate, ethyl acetate and lauryl sulphate, (3) a copolymer of acrylic acid butyl ester, methacrylic acid methyl ester and methacrylic acid amide and an aqueous emulsion containing the reaction product of hexamethylene diisocyanate with a branched chain polypropylene glycol having a molecular weight of 3000 obtained by the propoxylation of trimethylol propane, or the reaction product of hexamethylene-diisocyanate and a polythioether having a molecular weight of 1900 obtained by condensing thiodiglycol with 2,2-dimethylpropandiol-(1,3), ethyl acetate and lauryl sulphate, and (4) a copolymer of acrylic acid butyl ester, butadiene and methacrylic acid amide and an aqueous emulsion of the reaction product of hexamethylene diisocyanate and a branched chain polypropylene glycol having a molecular weight of 3000 obtained by the propoxylation of trimethylol propane, ethyl acetate and lauryl sulphate.ALSO:Felted textile materials are produced by treating a textile material suitable for felting with an aqueous liquor which contains (a) a polymer or copolymer derived from vinyl or divinyl monomers and (b) a reaction product containing isocyanate groups prepared by reacting a compound of molecular weight 500-6,000 having at least two hydroxyl groups with a polyisocyanate and thereafter felting the treated textile material.  Suitable vinyl or divinyl monomers from which the polymers or copolymers (a) are derived are ethylene, propylene, vinyl chloride, vinyl acetate, vinyl ethyl ether, styrene, divinyl benzene, butadiene, isoprene, chloroprene, acrylic and methacrylic acids and their nitriles, esters and amides including their N-methylol amides or derivatives thereof prepared by reaction with alcohols containing at least one further functional group.  The compound of molecular weight 500-6,000 which carries at least two hydroxyl groups used to prepare the reaction product (b) may be a polyethylene glycol, polypropylene glycol, polybutylene glycol, polyhexylene glycol, a polythioether obtainable by condensing thiodiglycol with itself or with sulphur-free polyalcohols or a polyester obtained from an aliphatic dicarboxylic acid, e.g. succinic, adipic, sebacic or maleic acid, and a glycol, e.g. ethylene glycol, diethylene glycol, propylene glycol, butane diol or neopentyl glycol and the diisocyanate used to prepare the reaction product (b) maybe tetramethylene-diisocyanate, hexamethylene diisocyanate, cycohexane-1,4-diisocyanate, dicyclohexyl-methane-4,4\sv-diisocyanate, hexahydrotoluylene-2,4- or 2,6 diisocyanate, p-phenylene-diisocyanate, toluylene-2,4- or -2,6-diisocyanate or <FORM:1083625/D1-D2/1> The weight ratio of (a) to (b) is preferably 0.25-4:1 and the aqueous liquor may contain 5-70% by of (a) and (b).  The textile material, e.g. fleeces of rabbit hair or hare fur or woollen fabric, may be impregnated with the aqueous liquor and squeezed to a weight increase of 60-100% or may be sprayed with the aqueous liquor, optionally dried, felted by milling and then stored for some days at room temperature or for a shorter period at temperature up to 100 DEG C and may then for example be made into hats.