Patent GB-382618-A (GB)
Title: Compositions for use in decolorizing dyed fabrics
IPC: D06P5/13
Filed: 1931-04-20
Abstract: A stable composition in cake or other solid form for use in the stripping of colour from dyed fabrics comprises as the predominating ingredient a compound of the hydrosulphite type and, as a minor ingredient, in intimate admixture therewith, a substantially nonvolatile substance in the form of a waterproof or water-repellent soap, oil, fat, or wax.  The compounds of the hydrosulphite type are, for example, the sodium hydrosulphite preparations known commercially as "lykopon," "bleacan," and "decrolin" (registered Trade Mark), the formaldehyde sulphoxylates of sodium, zinc, or calcium, the zinc hydrosulphite known commercially as "protolin," formaldehyde bisulphites and basic zinc formaldehyde sulphoxylate known commercially as "rongalite" (registered Trade Mark), or "formopon-extra."  The waterproof or water-repellent substance may be a substantially non-volatile hydrocarbon such as petrolatum, kerosene or paraffin oil, an insoluble soap such as aluminium stearate, a sulphonated soap, a vegetable oil such as castor oil or corn oil, a sulphonated oil or a substantially anhydrous salt thereof, a fatty acid, e.g. oleic or stearic acid, a sulphonated fatty acid, a naphthenic acid or a sulphonated petroleum residue.  The composition may also contain a substance serving to emulsify or saponify the waterproof or water-repellent substance in aqueous solution.  Thus paraffin oil or a vegetable oil or wax may be emulsified by a sulphonated soap, a sulphonated oil, ordinary soap, "neomerpin" (registered Trade Mark) which is a salt of a sulphonated alkylated polynuclear hydrocarbon, sulphonated petroleum residues or sodium caseinate, and suitable saponifying agents are caustic soda or potash, soda ash, borax, dry sodium phosphate or ammonia.  Examples relate to mixtures of (1) 90 grs. of sodium hydrosulphite, 10 grs. of petrolatum, and 5-30 grs. of isopropylnaphthalene sodium sulphonate, sodium caseinate, a sulphonated oil or sodium ricinoleate, with or without soda ash, sodium bisulphite or common salt, (2) 90 grs. of sodium hydrosulphite, 10 grs. of oleic acid, stearic acid, sulpholeic acid, castor oil, corn oil or sulphonated castor oil, and sufficient soda ash, borax or ammonium carbonate to effect complete or partial saponification.  Specification 204,077, [Class 120 (iii), Yarns &c.], is referred to.ALSO:A stable composition in cake or other solid form for use in the stripping of colour from dyed fabrics comprises as the predominating ingredient a compound of the hydrosulphite type and, as a minor constituent, in intimate admixture therewith, a substantially nonvolatile substance in the form of a waterproof or water-repellent soap, oil, fat or wax.  The compounds of the hydrosulphite type are, for example, the sodium hydrosulphite preparations known commercially as "lykopon," "bleacan" and "decrolin" (Registered Trade Mark), the formaldehyde sulphoxylates of sodium, zinc or calcium, the zinc hydrosulphite known commercially as "protolin," formaldehyde bisulphites and basic zinc formaldehyde sulphoxylate known commercially as "rongalite" (Registered Trade Mark), or "formopon-extra."  The waterproof or waterrepellent substance may be a substantially non-volatile hydrocarbon such as petrolatum, kerosene, or paraffin oil, an insoluble soap such as aluminium stearate, a sulphonated soap, a vegetable oil such as castor oil or corn oil, a sulphonated oil or a substantially anhydrous salt thereof, a fatty acid, e.g. oleic or stearic acid, a sulphonated fatty acid, a naphthenic acid or a sulphonated petroleum residue. The composition may also contain a substance serving to emulsify or saponify the waterproof or water-repellent substance in aqueous solution.  Thus paraffin oil or a vegetable oil or wax may be emulsified by a sulphonated soap a sulphonated oil, ordinary soap, "neomerpin" (Registered Trade Mark) which is a salt of a sulphonated alkylated polynuclear hydrocarbon, sulphonated petroleum residues or sodium caseinate, and suitable saponifying agents are caustic soda or potash, soda ash, borax, dry sodium phosphate or ammonia.  Examples relate to mixtures of (1) 90 grs. of sodium hydrosulphite, 10 grs. of petrolatum and 5-30 grs. of isopropylnaphthalene sodium sulphonate, sodium caseinate, a sulphonated oil or sodium ricinoleate, with or without soda ash, sodium bisulphite or common salt; (2) 90 grs. of sodium hydrosulphite, 10 grs. of oleic acid, stearic acid, sulpholeic acid, castor oil, corn oil or sulphonated castor oil and sufficient soda, borax or ammonium carbonate to effect complete or partial saponification.  Specification 204,077, [Class 120 (iii), Yarns &c.], is referred to.