Patent GB-1106177-A (GB)
Title: Process for reinforcing fleeces
IPC: D04H1/4209
Filed: 1965-05-05
Abstract: A dispersion used to reinforce a fibrous fleece (see Division D1) comprises a copolymer that contains units of an ester of a beta-ketonic acid or laevulinic acid with an unsaturated alcohol and units of at least one copolymerizable compound, and a cross-linking agent for the copolymer.  The ketonic ester may be that of acetoacetic acid or laevulinic acid and vinyl or allyl alcohol; the other monomer may be a vinyl ester of an acid of 1 to 20 carbon atoms, or an ester of acrylic, methacrylic maleic or fumaric acid with an alcohol of 3 to 8 carbon atoms.  The copolymer may be made by emulsion polymerization.  The corss-linking agent may be the dihydrazide of adipic or terephthalic acid, diethyl adipate, dimethyl maleate, maleic anhydride, tris-aziridinyl-1-phosphine oxide, formalized beta-beta1-dihydroxy-diethyl sulphone, terephthalic acid diethylene imide, barbituric acid, urotropine or a mixture of urotropine and formaldehyde. In the Examples, impregnating compositions comprise: (1) 85:15 copolymer of vinyl acetate and alkyl acetoacetate, adipic acid hydrazide, water and alkylaryl-polyglycol ether; (2) copolymer of Example 1, terephthalic acid diethylenimide, water and alkylarypolyglycol ether; (3) copolymer of Example 1 with butyl acrylate or dibutyl maleate as softening component, adipic acid dihydrazide and alkylarylpolyglycol ether; and (4) 90:10 copolymer of vinyl acetate and allyl acetoacetate, trisaziridinyl-1-phosphine oxide and water.ALSO:A fibrous fleece is reinforced by applying an aqueous dispersion of (a) a copolymer that contains units of an ester of a beta-ketonic acid or laevulinic acid and vinyl or allyl alcohol and units of at least one copolymerizable compound, and (b) a cross-linking agent for the copolymer, drying and heating to cross-link the polymer.  The drying and heating may be carried out in the same or separate steps.  The ketonic ester may be that of acetoacetic acid or laevulinic acid and vinyl or alkyl alcohol; the other monomer may be a vinyl ester of an acid of 1 to 20 carbon atoms, or an ester of acrylic, methacrylic maleic or fumaric acid with an alcohol of 3 to 8 carbon atoms.  The copolymer may be made by emulsion polymerization.  The cross-linking agent may be the dihydrazide of adipic or terephthalic acid, diethyl adipate, dimethyl maleate, maleic anhydride, tris - aziridinyl - 1 - phosphine oxide, formalized beta-beta\sv-dihydroxy-diethyl sulphone, terephthalic acid diethylene imide, barbituric acid, urotropine or a mixture of urotropine and formaldehyde.  The fibres may be of wool, natural or regenerated cellulose, polyamide, polyacrylonitrile, polyvinyl chloride, polyester, glass or asbestos.  In The Examples, impregnating compositions comprise: (1) 85:15 copolymer of vinyl acetate and alkyl acetoacetate, adipic acid hydrazide, water and alkylaryl-polyglycol ether; (2) copolymer of Example 1, terephthalic acid diethylenimide, water and alkylarylpolyglycol ether; (3) copolymer of Example 1 with butyl acrylate or dibutyl maleate as softening component, adipic acid dihydrazide and alkylarylpolyglycol ether; and (4) 90:10 copolymer of vinyl acetate and allyl acetoacetate, tris-aziridinyl-1-phosphine oxide and water.