Fluid to pasty washing agent containing bleach

Details Fluid to pasty washing agent containing bleach Fluid to pasty washing agent containing bleach

1991-08-14

1995-10-10

Straub, Gary P.

Compositions

Electrolytes for electrical devices

252 94, 252 99, 252102, 252559, 25217416, 25217424, 25217425, 252DIG16, C11D 900, C11D 906

Patent

active

054568501

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a phosphate-free, fluid to pasty washing agent, which, in view of its particular tenside content, its strongly alkaline, phosphate-free builder component and its bleach content, is particularly intended for use in industrial laundries.
Pasty washing agents which are substantially free of water and which contain bleaching per-compounds are known. In DE 12 79 878 (GB 12 05 711) a pasty agent is described, the liquid phase of which consists of non-ionic tensides and lower alcohols. Sodium tripolyphosphate (TPP) and soda are used as builder salts and sodium perborate monohydrate is used as a bleaching agent. To avoid separation of the pastes in storage, the solids are finely ground and additional suspension stabilisers in the form of finely divided silicic acid are added to the agent. Washing pastes are known from DE 22 33 771 (U.S. Pat. No. 3,850,831) which contain mixtures of non-ionic tensides and polyhydric alcohols as a liquid phase and phosphates, citrate and nitrilotriacetate as builder salts. Water glass, i.e. a weakly alkaline silicate consisting of Na.sub.2 O:SiO.sub.2 =1:3.3 may also be present. Perborate is a possible per-compound.
EP 30 096 teaches that the solids, consisting of builder salts and per-salts, must be ground to a particle size of less than 10 .mu.m in order to avoid separation of the paste during storage. The builder salts consist primarily of polyphosphates. Metasilicates and organic builder salts may also be present, but no further details are provided about this. The tenside component consists solely of liquid non-ionic tensides. Anionic tensides are not present in the pastes. The agents are not satisfactory for the strict requirements of industrial laundries with regard to optimal washing results with widely varying degrees of soiling using washing times which are as short as possible in order to make good use of the expensive washing plant.
In this respect the present invention makes possible a substantial improvement. Care had to be taken that the agents foam as little as possible both during washing and in subsequent rinsing, as a high degree of foam development not only leads to operational breakdowns caused by effluent liquor, but also produces worse washing results, as a large foam cushion suppresses the necessary mechanical treatment of the goods being washed. Furthermore, in the interests of minimizing pollution by the waste water, substantial freedom from phosphates is desirable. Compared with agents containing phosphates however, P-free washing agents require a changed overall concept in order to avoid a drop in the cleaning effectiveness. With powdered washing agents this development is quite far advanced, while with pasty agents the problems are much greater because of the limited selection of usable raw materials. For industrial use however liquid or pasty agents are preferable as they allow automatic metering.
The following invention presents one way of advantageously solving the recited problems.
The invention provides a fluid to pasty phosphate-free washing agent with the following content, in each case based on the washing agent:
(A) A tenside component of 20 to 35% w/w which comprises highest, 10.degree. C.,
(B) 10 to 35% w/w builder salts which are either complexing or which bind alkaline earth metal ions,
(C) 15 to 40% w/w sodium metasilicate,
(D) 8 to 25% w/w bleaching per-salts,
(E) up to 15% w/w other washing agent components,
(F) less than 3% w/w water,
Suitable ingredients of the tenside component A1 are alkyl benzene sulphonates with linear alkyl chains of 10 to 13 C-atoms, alkane sulphonates with 12 to 16 C-atoms, such as can be obtained by sulphochloridation or sulphoxidation of n-paraffins with subsequent conversion to the alkali salts, and alpha-sulphonated fatty acid esters and fatty acid salts derived from saturated C.sub.12-18 -fatty acids and from C.sub.1-4 -alcohols, preferably methyl alcohol. Preferred sulphonate tensides are alkyl benzene sulphonates.
Further suitable ingredients are soaps from saturated or singly unsa

REFERENCES:
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patent: 4457856 (1984-07-01), Mitchell et al.
patent: 4661281 (1987-04-01), Seiter et al.
patent: 4690771 (1987-09-01), Ouhadi et al.
patent: 4743394 (1988-05-01), Kaufmann et al.

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