Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Patent
1994-12-05
1997-07-01
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
252321, 252358, 510521, 510525, C11D 108, C11D 312
Patent
active
056438621
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to stable liquid detergents comprising silicone antifoam agents.
More in particular, the present invention relates to stable foam controlled liquid detergents comprising silicone antifoam compounds and particulate stabilizing aids.
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 in finely dispensed form have been found to be particularly effective species, and efforts have been directed to increase the stability of such agents upon prolonged storage in a liquid detergent composition containing them.
In U.S. Pat. No. 4,798,671, it has been proposed to make a premix of dispensing agents and suds controlling agents to obtain storage benefits. However, it is extremely difficult to create and maintain the finely dispersed form in liquid detergent compositions and especially in the presence of high ionic strengths.
Surprisingly, it has now been found that improved storage stability of silicone antifoam compounds can be achieved by adding low levels of a particulate stabilizing aid.
According to the present invention, an antifoam agent is provided which has improved stability upon storage when incorporated in liquid detergents.
According to one embodiment, a stable liquid detergent composition comprising said antifoam agent is provided.
According to another embodiment, a process is provided to obtain a stable liquid detergent composition comprising said antifoam agent.
SUMMARY OF THE INVENTION
The present invention provides antifoaming agents for inclusion in detergent compositions in liquid form, said antifoam agent comprising a silicone antifoam compound, a surfactant-containing solution, a particulate stabilizing aid and optionally a dispersant.
The present invention also provides detergent compositions containing a surface-active agent, said antifoam agent, and optionally other detergent ingredients.
DETAILED DESCRIPTION OF THE INVENTION
The silicone antifoam compound is present in the antifoam agent of the present invention, at levels of from 0.1% to 80% by weight, preferably 5% to 80% 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## wherein n is from 20 to 2,000, and 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 can be rendered hyrophobic by treating them with diaklylsilyl groups and/or trialkylsilane groups either bonded directly onto the silica or by means of silicone resin. A preferred antifoam compound comprises a hydrophobic silanated, most preferably trimethylsilanated silica having a particle size in the range from 10 mm to 20 mm and a specific surface area above 50 m.sup.2 /g.
Silicone antifoams employed in a foam control agent according to this invention suitably have an amount of silica in the range of 1 to 30% (more preferably 2.0 to 15%) by weight
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Broeckx Walter
Fisk Andrew Albon
Jones Roger Jeffery
Surutzidis Athanasios
Allen George W.
Aylor Robert B.
Fries Kery A.
Lieberman Paul
The Procter & Gamble & Company
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