Patent GB-714348-A (GB)
Title: Improvements relating to detergent compositions
IPC: C11D3/28
Filed: 1951-10-26
Abstract: A minor proportion of a 2.4.6-triamino- 1.3.5 triazine compound is added to detergent compositions to inhibit their tarnishing action on metals, such as German silver.  The detergent compositions may contain or comprise water-soluble inorganic polyphosphates, such as hexasodium hexametaphosphate, hexasodium tetraphosphate or the alkali-metal or ammonium salts of tripolyphosphoric, tetraphosphoric or pyrophosphoric acid, and/or synthetic organic detergents.  The latter include the sulphated and sulphonated detergents such as the sulphates of aliphatic compounds having, preferably 12 to 26 carbon atoms in the molecule, and more particularly those having an acyl radical of about 8 to 22 carbon atoms.  Such compounds include the sulphuric acid esters of polyhydric alcohols incompletely esterified with higher fatty acids, e.g. coconut oil monoglyceride monosulphate, and tallow diglyceride monosulphate; the pure or mixed higher alkyl sulphates, e.g. laceryl sulphate, cetyl sulphate and those derived from reduced coconut oil fatty acids; the hydroxy sulphonated higher fatty acid esters, e.g. higher fatty acid esters of 2.3-dihydroxy-propane sulphonic acid and the oleic ester of isethionic acid; the higher fatty acid ethanolamide sulphates and the higher fatty acid amides of amino alkyl sulphonic acids, e.g. lauric acid tauride.  The synthetic organic detergent may also be an alkyl aryl sulphonate wherein the nucleus may be derived from benzene, toluene, xylene, phenol, cresols or naphthalene, and the alkyl groups may have 8 to 22 and preferably 12 to 16 carbon atoms.  These detergents are generally used in the form of their water-soluble salts such as alkali-metal, alkaline-earth metal, magnesium, ammonium, amine or alkylolamine salts The synthetic organic detergent may also comprise a non-ionic detergent such as the polyoxyethylene ether of an alkyl phenol or of a long chain aliphatic alcohol.  The inhibitor may be melamine itself, or melamine in which the hydrogen atoms have been replaced by substituents such as methyl or alkylol, but it is desirable that one free hydrogen atom and preferably one primary amino group be present in the molecule.  Although the inhibitor may be used in amounts up to 5 per cent. by weight of the total composition, the percentage will normally be less than 1 per cent. and preferably up to 0.5, e.g. 0.3 per cent.  Less than 1 per cent of additive is particularly effective for use with built detergent compositions containing from 10 to 50 per cent. and preferably 15 to 40 per cent. by weight of a synthetic organic detergent, preferably of the sulphated or sulphonated type, and about 10 to 80 per cent. and usually 20 to 60 per cent. by weight of polyphosphates.  The compositions may contain other additives such as alkali-metal phosphates, silicates, sulphates, chlorides, hydroxides and carbonates, sodium carboxymethylcellulose and fatty acid amides, alcohols or esters.  Specifications 681,642, 686,805 and 696,357 are referred to.ALSO:A minor proportion of a 2. 4. 6-triamino-1. 3. 5 triazine compound is added to detergent compositions to inhibit their tarnishing action on metals, such as German silver.  The detergent composition may contain or comprise water-soluble inorganic polyphosphates, such as hexasodium hexametaphosphate, hexasodium tetraphosphate or the alkali-metal or ammonium salts of tripolyphosphoric, tetraphosphoric or pyrophosphoric acid, and/or synthetic organic detergents.  The latter include the sulphated and sulphonated detergents (see Group III).  These detergents are generally employed in the form of their water-soluble salts such as alkali-metal, alkaline-earth metal, magnesium, ammonium, amine or alkylolamine salts.  The synthetic organic detergent may also comprise a non-ionic detergent such as the polyoxyethylene ether of an alkyl phenol or of a long chain aliphatic alcohol.  The inhibitor may be melamine itself, or melamine in which the hydrogen atoms have been replaced by substitutents such as methyl or alkylol, but it is desirable that one free hydrogen atom and preferably one primary amino group be present in the molecule. Although the inhibitor may be used in amounts up to 5 per cent. by weight of the total composition, the percentage will normally be less than 1 per cent. and preferably up to 0.5 e.g. 0.3 per cent. Less than 1 per cent. of additive is particularly effective for use with detergent compositions containing from 10 to 50 per cent. and preferably 15 to 40 per cent. by weight of a synthetic organic detergent, preferably of the sulphated or sulphonated type, and about 10 to 80 per cent. and usually 20 to 60 per cent. by weight of polyphosphates.  The compositions may contain other additives such as alkali-metal phosphates, silicates, sulphates, chlorides, hydroxides and carbonates, sodium carboxymethylcellulose and fatty acid amides, alcohols or esters. Specifications 681,642, 686,805 and 696,357, [all in Group III], are referred to.