Compositions – Water-softening or purifying or scale-inhibiting agents
Patent
1993-06-15
1995-10-10
Lieberman, Paul
Compositions
Water-softening or purifying or scale-inhibiting agents
252321, 252358, 25217413, 25217417, 25217421, C11D 322, C11D 308
Patent
active
054568552
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is concerned with foam control agents in granular form and with detergent compositions containing such agents.
BACKGROUND
It has become common practice in the detergent industry to include in detergent compositions materials which are intended to control the amount of foam produced during a washing cycle in a washing machine.
Indeed, excessive sudsing has been found to interfere negatively with the action of the wash liquor upon the fabrics.
Silicone antifoam agents have been found to be particularly effective species, and efforts have been directed to increase the stability of such agents upon prolonged storage of the detergent compositions containing them.
In GB 1,492,339, it has been proposed to coat silicone antifoam agents with an organic material which is a water soluble or water dispersible, substantially non-surface active, detergent-impermeable material e.g. gelatin, agar or certain reaction products of tallow alcohol and ethylene oxide.
In EP-A-210 721, it has been proposed to coat silicone antifoam agents with water-insoluble fatty acid or fatty alcohols, and in EP-A-210 731 it has been disclosed to coat silicone antifoam agents with a monoester of glycerol and a fatty acid.
While such antifoam agents in granulate form appear to exhibit desirable stability upon storage, when incorporated in detergent compositions, it has been found that such antifoam granulates were not ideally suited for an easy incorporation into detergent compositions in powder form, such as dry-mixing.
It is thus the object of the present invention to provide storage-stable foam controlling agents, in the form of granulates which are free flowing and easily processable into a detergent composition.
SUMMARY OF THE INVENTION
The present invention provides a stable, free-flowing foam-control agent in granular form for inclusion in a detergent composition in powder form, comprising a silicone antifoam compound, a carrier material, preferably starch, an organic coating material, characterized in, that it contains glycerol, at a weight ratio with the silicone antifoam compound of 1:4 to 2:1.
The present invention also provides detergent compositions containing a surface-active agent, said foam control agent, and optionally other detergent ingredients.
DETAILED DESCRIPTION OF THE INVENTION
The Silicone Antifoam Compound
The silicone antifoam compound is present in the foam-control agents of the invention, at levels of from 5% to 20% by weight, preferably 8% to 15% by weight.
In industrial practice, the term "silicone" has become a generic term which encompasses a variety of relatively high-molecular-weight polymers containing siloxane units and hydrocarbyl groups of various types. Generally, the silicone suds-controllers can be described as siloxanes having the general structure: ##STR1## where each R independently can be an alkyl or an aryl radical. Examples of such substituents are methyl, ethyl, propyl, isobutyl, and phenyl. Preferred polydiorganosiloxanes are polydimethylsiloxanes having trimethylsilyl endblocking units and having a viscosity at 25.degree. C. of from 5.times.10.sup.-5 m.sup.2 /s to 0.1 m.sup.2 /s i.e. a value of n in the range 40 to 1500. These are preferred because of their ready availability and their relatively low cost.
A preferred type of silicone antifoam agent useful in the compositions herein comprises a mixture of an alkylated siloxane of the type hereinabove disclosed and solid silica.
The solid silica can be a fumed silica, a precipitated silica or a silica made by the gelformation technique. The silica particles suitably have an average particle size of from 0.1 to 50 m, preferably from 1 to 20 m and a surface area of at least 50 m.sup.2 /g. These silica particles can be rendered hydrophobic by treating them with dialkylsilyl groups and/or trialkylsilyl groups either bonded directly onto the silica or by means of a silicone resin. It is preferred to employ a silica the particles of which have been rendered hydrophobic with dimethyl and/or trimethyl
REFERENCES:
patent: 3933672 (1976-01-01), Bartolotta et al.
patent: 4013573 (1977-03-01), Leikhim et al.
patent: 4437349 (1984-05-01), Tai
patent: 4447349 (1984-05-01), Tai
patent: 4451387 (1984-05-01), Tai et al.
patent: 4457387 (1984-07-01), Taylor
patent: 4637890 (1987-01-01), Crabtree et al.
patent: 4652392 (1987-03-01), Baginski et al.
patent: 4732694 (1988-03-01), Gowland et al.
patent: 4806266 (1989-02-01), Burrill
patent: 4894177 (1990-01-01), Starch
patent: 4919843 (1990-04-01), Innertsberger et al.
patent: 5238596 (1993-08-01), Smith
Fries Kery A.
Lieberman Paul
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
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