GB894195A - Treating cellulosic textile materials - Google Patents

Abstract

The process of the parent Specification (wherein fabrics and yarns containing or consisting of cellulosic fibres having an average of at least 1,8 hydroxy groups per anhydroglucose unit are treated by applying to them (1) a proportion of water at least sufficient to swell the cellulosic fibres but not exceeding a proportion of 130% weight of the bone dry fibres, (2) a catalyst which is an alkali metal hydroxide or an alkali metal salt which, as a 1% aqueous solution, has a pH of at least 10, or a quaternary ammonium hydroxide, the proportion of hydroxide, on a dry weight basis and calculated as NaOH, being not less than 2% by weight and not more than 30% by weight of the total water present and, where a salt is employed, the limits of the proportions being those equivalent to the proportions of hydroxide employed by the above definition, and the numerical product of the proportion of catalyst employed, calculated as dry sodium hydroxide and in terms of per cent by weight present, in terms of per cent by weight of the total water present, times the proportion of water of the bone dry cellulosic fibres, being not more than 4000, and (3) at least about 1%, by weight of the cellulosic fibres, of a cellulose cross-linking agent) is modified in that the cross-linking agent comprises the polyether condensation product of epichlorhydrin and propylene glycol or glycerine. In an example, wet cotton material is padded with a 25% aqueous solution of sodium hydroxide and squeezed to a content of 70 to 80% of water and 12% of sodium hydroxide (based on the weight of the dry cotton). The material in open width is then passed in contact with the upper peripheral surface of a stainless steel roll, the lower surface of which extends into a bath of a propylene glycol-epichlorhydrin condensation product. The speed of the roll, relative to the linear rate of travel of the fabric, is adjusted so that about 12% by weight of the condensation product (based upon the dry weight of the fabric) is deposited, and the fabric is thereafter rolled into a tight roll and allowed to stand for 18 hours. The roll is then unwound, scoured in water containing a lauryl sulphate wetting agent and dried upon a tenter frame. The treatment imparts configuration-retaining properties to the yarns or fabrics.ALSO:The process of the parent Specification (wherein fabrics and yarns containing or consisting of cellulosic fibres having an average of at least 1.8 hydroxy groups per anhydroglucose unit are treated by applying to them (i) a proportion of water at least sufficient to swell the cellulosic fibres but not exceeding a proportion of 130% by weight of the bone dry fibres, (2) a catalyst which is an alkali metal hydroxide or an alkali metal salt which, as a 1% aqueous solution, had a pH of at least 10, or a quaternary ammonium hydroxide, the proportion of hydroxide, on a dry weight basis and calculated as NaOH, being not less than 2% by weight and not more than 30% by weight of the total water present and, where a salt is employed, the limits of the proportions being those equivalent to the proportions of hydroxide employed by the above definition, and the numerical product of the proportion of catalyst employed, calculated as dry sodium hydroxide and in terms of per cent by weight of the total water present, times the proportion of water present, in terms of per cent by weight of the bone dry cellulosic fibres, being not more than 4000, and (3) at least about 1%, by weight of the cellulosic fibres, of a cellulose cross linking agent) is modified in that the cross-linking agent comprises the polyether condensation product of epichlorhydrin and propylene glycol or glycerine. In an example, wet cotton material is padded with a 25% aqueous solution of sodium hydroxide and squeezed to a content of 70% to 80% of water and 12% of sodium hydroxide (based on the weight of the dry cotton). The material in open width is then passed in contact with the upper peripheral surface of a stainless steel roll, the lower surface of which extends into a bath of a propylene glycol-epichlorhydrin condensation product. The speed of the roll, relative to the linear rate of travel of the fabric, is adjusted so that about 12% by weight of the condensation product (based upon the dry weight of the fabric) is deposited, and the fabric is thereafter rolled into a tight roll and allowed to stand for 18 hours. The roll is then unwound, scoured in water containing a lauryl sulphate wetting agent and dried upon a tenter frame. The treatment imparts configuration-retaining properties to the yarns or fabrics.