Patent GB-1070696-A (GB)
Title: A method of producing consolidated fibre sheet material
IPC: D04H1/4258
Filed: 1964-06-22
Abstract: A consolidated sheet material is made by treating a fleece, paper, wadding, felt or like fabric material with a binding agent that is a mixture of two components.  The first component is the reaction product of an aliphatic or cycloaliphatic polyamide containing free unacylated secondary or primary amino groups with an epoxyhalide. The other component is a polymer or copolymer containing at least 30% of an ethylenically unsaturated nitrile or a vinyl alkylcarboxylate or an alkyl ester of an unsaturated carboxylic acid or of more than one thereof, and having a fastness to light determined by a "Xenotest" of over 300 hours. In Example 1, a polyamide resin is produced by condensing diethylene triamine and adipic acid, is reacted with epichlorohydrin, and the product, as aqueous solution, adjusted to pH 5 to 6; a copolymer of acrylonitrile and butyl acrylate is dispersed in water containing the sodium salt of an alkylbenzenesulphonic acid; the solution and dispersion are mixed and diluted with water.  In Example 2, a polyamide resin is produced by condensing e -caprolactam, hexamethylenediamine adipate and diethylenetriamine, dissolved in aqueous alcohol, treated with epichlorohydrin and adjusted to pH 5.5; a dispersion of a copolymer of vinyl acetate and isopropyl maleate is mixed with the solution of modified polyamide. Reference is also made to polyamides derived from sebacic, succinic and oxalic acids, ethylenediamine, decamethylenediamine, triethylenetetramine, and dimerized linolenic acid, or by transamidation of polymers of diamines and dicarboxylic acids with polyamines.  The binding-agent mixture may also contain a plasticizing, stabilizing, viscosity-raising, foam-generating, or foam-destroying agent.ALSO:A consolidated sheet material is made by treating a fleece, paper, wadding, felt or like fabric material with a binding agent that is a mixture of two components.  The first component is the reaction product of an aliphatic or cycloaliphatic polyamide containing free unacylated secondary or primary amino groups with an epoxyhalide.  The other componet is a polymer or copolymer containing at least 30% of an ethylenically unsaturated nitrile or a vinyl alkylcarboxylate or an alkyl ester of an unsaturated carboxylic acid or of more than one thereof, and having a fastness to light determined by a "Xenotest" of over 300 hours.  The fibrous material may be of natural, artificial or fully synthetic fibres.  The binders may be applied by soaking, spraying or foaming, and the product dried by heating.  In Example 1, a polyamide resin is produced by condensing diethylene triamine and adipic acid, is reacted with epichlorohydrin, and the product, as aqueous solution, adjusted to pH 5 to 6; a copolymer of acrylonitrile and butyl acrylate is dispersed in water containing the sodium salt of an alkylbenzenesulphonic acid; the solution and dispersion are mixed and diluted with water, and a carded fleece of regenerated cellulose fibres is dipped therein, pressed and dried.  In Example 2, a polyamide resin is produced by condensing e -caprolactam, hexamethylenediamine adipate and diethylenetriamine, dissolved in aqueous alcohol, treated with epichlorohydrin and adjusted to pH 5.5; a dispersion of a copolymer of vinyl acetate and isopropyl maleate is mixed with the solution of modified polyamide, and applied by padding to a blotting paper, which is then dried without pressure.  Reference is also made to polyamides derived from sebacic, succinic and oxalic acids, ethylenediamine, decamethylenediamine, triethylenetetramine, and dimerized linolenic acid, or by transamidation of polymers of diamines and dicarboxylic acids with polyamines.  The binding-agent mixture may also contain a plasticizing, stabilizing, viscosity-raising, foam-generating, or foam-destroying agent.  The products may be used as throwaway linen, sanitary towels, absorbent bodies or their envelopes, filter materials, heat- and sound-absorbent materials or decorative materials.