Improvements in stabilised soaps, synthetic detergents and mixtures of the same

摘要

Soaps, synthetic detergents and mixtures thereof in solid form, e.g. in cake, flake, needle and powder form, are stabilized against spotting and rancidity caused by heavy metal ions such as those of iron, nickel and copper by the incorporation of an additive which is substantially free from uncombined alkali metal hydroxide comprising (a) one or more polyhydric alcohols containing more than 4 hydroxyl groups, and (b) one or more complex-forming compounds containing the group where R1 and R2 each represent -C2H4OH or -CH2COOX, X being hydrogen or an alkali metal. The total of (a) and (b) preferably amounts to 0.05-5% by weight of the composition, and the weight ratio of (a) to (b) is 2:1 to 1:1. (a) is for example manitol, xylitol, or hydrogenated wood hydrolysate, but is preferably sorbitol, while (b) may be dihydroxyethylamino-acetic acid, iminodiacetic acid, nitrilotriacetic acid, hydroxyethylethylene diamine triacetic acid, ethylene diamine triacetic acid, 1:2-diaminocyclohexane tetracetic acid, N:N1-dihydroxyethyl-1:2-diaminocyclohexane-N:N1 -diacetic acid, 2-hydroxy-1:3-diaminopropane tetracetic acid, or tetrahydroxyethyl-1:2-diaminocyclohexane, but is preferably ethylenediamine tetracetic acid. Suitable detergents, in addition to soap, include alkyl sulphates or sulphonates, alkylglycol ether sulphates, alkylaryl sulphonates, fatty acid condensates, poly-glycol ethers of alkylphenols or fatty alcohols, or cationic active compounds. Cellulose ether carboxylic acids, cellulose ethers and esters, salts of polyacrylic and polymethacrylic acids, polyvinyl compounds such as polyvinylpyrrolidone, polyglycol ethers, fatty acid alkanolamides, triethanolamine, esters of polyhydric alcohols and glucosides, glucosides themselves and ethylene condensates of such esters and glucosides, potato flour, phosphates, silicates, sodium chloride and sulphate, talc, bentonite, titanium dioxide, paraffin wax, petroleum jelly, skin protectives, disinfectants, optical brighteners and dyestuffs may also be incorporated.