IL30375A - A detergent composition - Google Patents

Description

A detergent composition AB HELIOS FABRIKBR 28650 30375 2 la The present invention is concerned with a detergent composition which contains sur pounds and chelating In the transition from peroxide containing detergent compositions based on soaps rnd to corresponding phosphate containing compositions different problems of corrosion often become copper alloy which are protected by a layer of metal soaps when using soap determents are attacked by and such attack is the stronger the tendency of the metal to form metal complex In such detergent compositions as those tended in this document small quantities of chelating such as of tetraacetic acid end nitrilotriacetic acid are usually added to sequester heavy which the decomposition of peroxides which are usually intermixed in the form of or other hydrogen peroxide containing It is also to use other peroxy such as hydrogen benzoyl acid In this connection it has only been the question of small quantities but recently it has been suggested to add tiraes the quantity of chelating agents to soften the whereupon the corrosion problem greatly The corrosion of copper is of particular especially as the heating elements in household washing machines are often encased in tubes of or copper A solution to these problems constitutes our invention according to the Swedish Patent which is concerned with a detergent composition distinguished for its low corrosion 2 effec particularly The detergent composition contains peroxide and one or more organic chelating and is characterized in that the surfactants comprise firstly organic phosphate nd secondly a alkylolamide or a dihydroxy alkylolamide of a higher fatty It has now been discovered that a comparable is obtained if the detergent composition according to tho present invention is used instead of the determent As this known detergent composition contains factants peroxy compounds and organic chelating said chelating agents being a considerable ingredient to 5 of the total and is characterized in that the surfactant are comprised of phosphate esters and optionally soap alone or together with other synthetic sur and that the detergent also includes water If solely phosnhate ester is used as a surfactant the waterglass content should vary between up to and should preferably lie between 4 d on If for some it is desired to use water glass outside the above disclosed limits additive can be added as a corrosion prohibi The content of soap can then be as low as by weighty and in principle its upper limit is only that at which all phosphate esters replaced with the content of soap should preferably not ceed by weight of the total The addition of may naturally also be made using the water glass concentration range tioned in the preceding paragraph to strengthen the corrosion vhen soap is included in the it is also possible to add other synthetic or in other a portion of the phosphate ester constituents can be replaced h other synthetic These can be selected from anionic and nonionic such as higher alkyl high r alkyl aryl sulphon tes and alkylene oxide adducts of higher This is economically more advantageous than to use solely phosphate as synthetic As chelating agents can be for diamine tetraacetic acid or suitably in the form of alkali metal The corrosion reducing e afforded by the invention is most prominent with stronger chelating organic acid and ethylenediamine acetic but the effect is also achieved when for The invention is therefore of particular significance in conjunction with organic chelating agents of the above mentioned As organic phosphate esters can b e used primarily of higher fatty alcohols having enrbon didecyl dilauryl Mixed phosphate esters of several higher fatty such as phosphate esters of alkoxylated higher fatty alcohols can also be As examples can be mentioned such products as are obtained by higher fatty such as tallow with ethylene oxid per mol fatty and phosphating the obtsined The soaps which may be used are primarily all soaps of higher fatty having carbon substantially as commercially available mixtures such as tallow fatty acid The composition of the detergent can vary wide 3a of vfhich the content of phosphate eater should be at least about and the content of soap between 0 and The remainder of the detergent can fcr soda sodium carboxymethyl cellulose compound corresponding to a content of active of and other well known ingredients used in detergents of the intended The invention now be illustrated in the following In a series of tests the magnitude of copper corrosion was determined for different detergent solutions containing phosphate surfactants with or without additions while using the following 1 liter of an aqueous detergen solution having the formulation given below and a water hardness of 4 79 as calcium was heated together with one piece of copper plate thick and presenting a total surface area of 100 The heating step was effected so that the boiling point was reached within 20 whereafter the solution was allowed to boil for 15 The reduction in weight of the copper plate milligrams was established by All the detergent solutions Soda 900 Sodium perborate 900 II Sodium carboxymethylcellulose 75 Whitening agent 20 Sodium nitrilotriacetate 900 500 ti Phosphate surfactant 660 and varying amounts water glass and The phosphate surfactant used was a product produced by reacting 1 mol tallow alcohol 4 StO and 2 mol octanol with mol and mol and the soap a commercially available mixture of acid soaps having essentially carton T e u t a se n in t table Tout Phoaphato oi total content Copper in cm 2 0 33 50 4 It can bo ooen from abovo that an content of eurfactant and ooap tho copper corrosion but that increasing phoaphato ornallor effect or no at all tho ooap relatively It further apparent the o nthotic ueol in addition phoaphato can varied in typo without getting any greater in tho 8 insufficientOCRQuality

Claims (5)

1. A detergent composition containing surfac nte, peroxy compounds and organic chelating agents, said chelating agents being a considerable ingredient amounting to 5 - 25 of the total veight, characterised in that the surfactants are comprised of phosphate esters and optionally soap alone or together with other synthetic surfactants, and that the detergent also includes water glass.

2. A detergent composition according to Claim 1, characterised in that the chelating agent is nitrilotriacetic acid,

3. A detergent composition according to Claim 1 or 2, characterized in that the phosphate ester is a phosphate ester of an optionally alkoxylated higher fatty alcohol.

4. · A detergent composition according to any of the preceding claims, characterized in that the optional constituent soap is a fatty acid soap having essentially 12-20 carbon atoms.

5. A detergent composition according to any of the preceding claims , characterized in that the content of water glass lies between about 0.1$ and up to 10$ by weight, preferably between about 4$ and about 8$ by weight. 6· A detergent composition according to any of the preceding claims, characterized in tat the content of soap when the phosphate esters are the only synthetic surfactant lies from 0% up to about 1 by weight, preferably between about 1$ to about f° by weight. 7· A detergent composition according to any of Claims 1 to 5, characterized in that the content of soap, when soap is 30375/2 9 - added together with other synthetic detergents than phosphate esters, lies between about 0.1 and about 15 by weight, preferably between about 0.5 and 5 by weight* 8, A detergent composition according to any of Claims 1 to 5 or 7» characterized in that the other synthetic surfactanta are anionic or nonionic surfactants as higher alkyl sulnhatee, higher alkyl aryl sulphonates and alkylene oxide adducts of higher alcohols. BD:BH