Compositions – Electrolytes for electrical devices
Patent
1994-03-23
1995-08-15
Albrecht, Dennis
Compositions
Electrolytes for electrical devices
252 99, 252102, 252104, 25217412, 25217421, 25217424, 25217425, 252175, 252181, 252DIG1, 252DIG14, C11D 172, C11D 312, C11D 3395, C11D 1708
Patent
active
054416612
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
1. Background of the Invention
This invention relates to a process for stabilizing hydrated zeolite, to a stable, liquid or paste-form, substantially water-free detergent or cleaning preparation containing zeolite NaA and bleaching agents and to a process for its production.
2. Discussion of Related Art
Water-free liquid detergents and liquid cleaning preparations containing fine-particle builders are known in large numbers. For reasons of safety in use, detergents and cleaning preparations of the type in question are generally present in the form of stabilized homogeneous suspensions. One particular advantage of water-free detergents is that bleaching agents containing active oxygen can be incorporated relatively easily by comparison with water-based formulations. However, an unacceptable reduction in active bleaching agent during storage has been observed in detergents and cleaning preparations of the type in question, particularly where zeolites are used as builders. As explained for example in European patent application EP 425 149, this is generally attributed to decomposition of the bleaching agent which is produced by the zeolite surface and which increases with increasing water content of the zeolite, but does not normally occur where water-free zeolites are used. Synthetic zeolites, among which zeolite NaA occupies a prominent position as a builder in detergents and cleaning preparations, normally accumulate in the form of more or less completely hydrated powders during their production. Thus, the water content of zeolite NaA can be up to about 25% by weight and is normally of the order of 20% by weight.
European patent application EP 364 184 describes water-free liquid detergents containing deactivated alumosilicated and, optionally, constitutents which, normally, readily decompose in the presence of alumosilicates, for example bleaching agents. The alumosilicate is deactivated in a relatively complicated two-stage process comprising treatment with an ammonium compound and subsequent heating, preferably to temperatures of 400.degree. C. to 450.degree. C. The water of hydration present in the alumosilicate is at least partly removed by the heat treatment. At temperatures as high as these, there is a danger, particularly in the case of zeolite A, of at least partial destruction of the zeolite structure and, hence a reduction in the builder quality of the treated material ("overdrying").
According to European patent application EP 425 149, a water-free zeolitic detergent builder is produced by heating in vacuo and substantially complete dehydration of a water-containing zeolite, for example zeolite A. This can be done in the presence of certain polyethers or polyalcohols or substances such as these are subsequently added to the dehydrated zeolite. The builders may be stably incorporated in water-free, bleach-containing liquid detergents, although the production of such detergents is complicated by the relatively difficult drying step.
Accordingly, there was still a need to provide a simple process for the production of stable zeolite- and bleach-containing liquid detergents or cleaning preparations which would enable normal hydrated zeolite to be used.
DESCRIPTION OF THE INVENTION
It has now surprisingly been found that a system of bleaching agent and hydrated zeolite NaA can be very effectively stabilized by treatment of the zeolite with organic liquids which have a certain polarity and which are referred to hereinafter as "deactivating agents". The stabilizing effect of the deactivating agent applies both to the bleaching component of the preparation, which shows significantly lower reductions in active bleaching agent after storage than in non-stabilized preparations, and to the paste-form or liquid detergent or cleaning preparation as a whole which does not show any tendency towards phase separation or separation of solid constituents.
Accordingly, the present invention relates to a process for the production of stabilized synthetic hydrated zeolite NaA which is charac
REFERENCES:
patent: 3630929 (1971-11-01), van Dijk
patent: 3953380 (1976-04-01), Sundby
patent: 4743394 (1988-05-01), Kaufmann
patent: 4769168 (1988-09-01), Ouhadi
patent: 5011622 (1991-04-01), Schepers
Organic Solvents--Physical Properties and Methods of Purification, J. A. Riddick, W. B. Bunger, T. K. Sakano, John Wiley & Sons, 4th Edition 1986, p. 59 (No month available).
Artiga Gonzalez Rene-Andres
Beaujean Hans-Josef
Bode Jens
Albrecht Dennis
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
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