Bleaching and dyeing; fluid treatment and chemical modification – Bleaching – Chemical
Patent
1993-03-29
1994-07-12
Albrecht, Dennis
Bleaching and dyeing; fluid treatment and chemical modification
Bleaching
Chemical
8137, 252 95, 252 99, 252104, 25217421, 252DIG1, 252DIG14, C11D 166, C11D 339, D06L 302, D06L 316
Patent
active
053284895
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of he Invention
This invention relates to inorganic peroxy compounds of the type used above all as laundry bleaching agents.
2. Description of the Invention
Powder-form laundry detergents which contain all the active substances required for washing and which, at the same time, are sufficiently stable in storage in the solid state have been known for some time. By contrast, liquid laundry detergents, which have been developed to an increasing extent in recent years, often show only limited stability in storage on account of interactions between individual ingredients. Above all, the incorporation of bleaching agents in liquid systems presents major problems. DE-ASS I 267 368 and I 279 878 and DE-OS 3 704 876 are cited as representative of the numerous proposals which have been made on this subject. Separate dosing of the bleaching agent has been proposed as an alternative, not least because of the hitherto unsolved problem of incompatibility between bleaching agents and other detergent ingredients, aqueous solutions of hydrogen peroxide being used as the bleaching agents in the majority of cases. On account of the caustic properties of hydrogen peroxide, these solutions have to be heavily diluted, at least for household laundry, and accordingly contain little active oxygen.
DESCRIPTION OF THE INVENTION
The present invention provides another solution to the problem in the form of a paste-form preparation of perborate monohydrate. This preparation contains 40 to 70% by weight and preferably 50 to 65% by weight perborate monohydrate in a liquid medium which consists predominantly or completely of addition products of ethylene oxide (EO) and long-chain saturated alcohols.
The new paste-form preparations of perborate monohydrate are chemically and physically very stable and are easy and convenient to handle and dose. They dissolve quickly in water or wash liquors so that the high content of active oxygen is fully available in a very short time.
The perborate monohydrate used in accordance with the invention is an alkali metal perborate, more particularly sodium perborate monohydrate, to which the formula NaBO.sub.3. H.sub.2 O is generally attributed. As far as is known at the present time, sodium perborate zenohydrate is in reality a cyclic diperoxodiborate with the formula Na.sub.2 H.sub.4 B.sub.2 O.sub.8 which does not contain any water of hydration. It has a theoretical active oxygen content of 16.0% by weight, although sodium perborates containing at least 15% by weight active oxygen are also regarded as monohydrate in the context of the present invention.
In the paste-form preparations according to the invention, the perborate zenohydrate is suspended, optionally together with other solids, in a liquid medium consisting predominantly or completely of certain nonionic surfactants.
The nonionic surfactants to be used in accordance with the invention are preferably liquid addition products of ethylene oxide and long-chain saturated alcohols which have a solidification point of, in particular, 10.degree. C. or lower. Addition products of 2 to 7 mol ethylene oxide and longchain saturated alcohols containing 12 to 18 carbon atoms are particularly preferred. These addition products are generally mixtures of mere or less highly ethoxylated alcohols, i.e. the figures represent average values, and the products themselves may also contain certain amounts of compounds having higher or lever degrees of ethoxylation. In some cases, it can be useful to use a mixture of two addition products with a relatively high and a relatively low average degree of ethoxylation. It is also possible to replace up to one third of the nonionic surfactants of this type by other nonionic surfactants, for example ethoxylation products of alkylphenols or mixed addition products of ethylene oxide and propylene oxide, providing this mixture of nonionic surfactants, optionally together with other organic liquids, remains liquid at room temperature and preferably down to 10.degree. C. Examples of suitable
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Derwent Accession, No. 87-070314, Questel Telesystems (WPIL), Derwent Publications Ltd., London, 1987 (no month available).
Beaujean Hans-Josef
Holz Erich
Schwadtke Karl
Albrecht Dennis
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
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