IE43532L - Low phosphate detergent. - Google Patents

Abstract

1530799 Powdered alkaline detergent composition for fabrics UNILEVER Ltd 26 Aug 1976 [28 Aug 1975] 35545/75 Heading C5D A powdered alkaline fabric washing detergent composition comprises 5-30 wt. per cent of a synthetic anionic, non-ionic, amphoteric or zwitterionic detergent compound or a mixture thereof, 10-30 wt. per cent of mixed alkali metal tripolyphosphate and alkali metal orthophospate in the wt. ratio of from 10:1 to 1:5, there being at least 5 wt. per cent of tripolyphosphate, and not more than 5 wt. per cent of alkali metal pyrophosphate, which is preferably absent. The pH of a 0À1% aqueous solution of the composition is in the range 9-11. Soap, preferably 0À5-25 wt. per cent of C 10-24 fatty acids at least half being C 16 or over, may also be present. Preferred detergent compounds are synthetic anionic and nonionic compounds. The former are usually water soluble alkali metal salts of organic sulphates and sulphonates having C 8 -C 22 alkyl radicals, including the alkyl portion of higher acyl radicals. Suitable non-ionic compounds include the reaction products of alkylene oxides with alkyl phenols, the condensation products of aliphatic primary or secondary alcohols with ethylene oxide, the condensation products of ethylene oxide with the reaction products of propylene oxide and ethylenediamine, long chain tertiary amine oxides, long chain tertiary phosphine oxides, and dialkyl sulphoxides. Optional ingredients include lather boosters such as alkanolamides, lather depressants such as alkyl phosphates and silicones, anti-redeposition agents such as sodium carboxymethyl cellulose and polyvinyl pyrrolidone, oxygen-releasing bleaching agents such as sodium perborate, preferably in amount of 10-40 wt. per cent, and sodium percarbonate, peracid bleach precursors, chlorine-releasing bleaching agents such as trichloroisocyanuric acid and alkali metal salts of dichloroisocyanuric acid, fabric softening agents, inorganic salts such as sodium sulphate, sodium carbonate, and magnesium silicate, enzymes such as proteases and amylases, perfumes, fluorescent agents, germicides, and colorants. Other optional ingredients include an antideposition agent, preferably 0À1-5 wt. per cent, for example a salt of a homo- or copolymer of acrylic acid or a substituted acrylic acid, preferably a sodium polyacrylate having a MW of 10,000-50,000, or a copolymer of maleic anhydride with ethylene, vinyl methyl ether, or styrene, or sodium salts of polymaleic acid and polyitaconic acid, phosphate esters of ethoxylated aliphatic alcohols, polyethylene glycol phosphate esters, and certain phosphonates, which last may be mixed with protective colloids such as gelatine. Alkali metal silicates, preferably 5-15 wt. per cent of sodium neutral or alkaline silicate, may also be present. Minor amounts of non-phosphate detergency builders, which may be either precipitant or sequestrant builders, may be present, for example amine carboxylates such as sodium nitrilotriacetate, sodium aluminosilicate ion-exchange materials, sodium citrate, and soap. [GB1530799A]