Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Patent
1995-02-14
1997-11-11
McGinty, Douglas J.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
510477, 252321, 252358, C11D 334, C11D 337
Patent
active
056864043
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to suds controlling compositions and stable liquid detergent compositions containing them.
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.
Silicone antifoam agents in finely dispersed form have been found to be particularly effective species, and efforts have been directed towards increasing the stability of such agents upon prolonged storage in liquid detergent compositions containing them.
However, it has found to be difficult to create and maintain the finely dispersed form of the silicone antifoam agents in liquid detergent compositions, especially in a high ionic strength medium.
In U.S. Pat. No. 4,798,671, it has been proposed to make a premix of dispersing agents and suds controlling agents to obtain storage benefits.
Surprisingly, it has now been found that improved storage stability of suds controlling agents in liquid detergent compositions can be achieved by adding to said agents a polymer-based latex. According to the present invention, a suds controlling composition is provided which has improved stability upon storage when incorporated into liquid detergents.
According to another embodiment of the present invention, a stable liquid detergent composition comprising said suds controlling composition is provided.
According to still another embodiment of the present invention, a process is provided to obtain stable liquid detergent compositions comprising the suds controlling composition of the present invention.
SUMMARY OF THE INVENTION
The present invention provides suds controlling composition for inclusion in a detergent composition in liquid form, comprising a silicone antifoam agent, a carrier material, a dispersant and a polymer-based latex.
The present invention also provides liquid detergent compositions comprising said suds controlling composition, surface-active agents and optionally other detergent ingredients.
DETAILED DESCRIPTION OF THE INVENTION
The Silicone Antifoam Agent
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 antifoam agent 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 diaklylsilane groups and/or trialkylsilane groups either bonded directly onto the silica or by means of silicone resin. A preferred antifoam agent comprises a hydrophobic silanated, most preferably trimethylsilanated silica having a particle size in the range from 10 nanometer to 20 nanometer and a specific surface area above 50 m.sup.2 /g. Silicone antifoam agents employed in the suds controlling composition suitable for to the present invention have an amount of silica in the range of 1 to 30%, more preferably from 1 to 20% by weight of the total weight of the silicone antifoam resulting in silicone antifoams having an average viscosity in the range from 2.times.10.sup.-4 m.sup.2 /s to 1m.sup.2 /s. Preferred silicone antifoams may have a
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Fries Kery
McGinty Douglas J.
Reed T. David
The Procter & Gamble & Company
Yetter J. J.
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