Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1999-09-09
2001-01-09
Gupta, Yogendra (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S130000, C510S137000, C510S141000, C510S158000, C510S159000, C510S466000, C510S471000, C510S475000
Reexamination Certificate
active
06172019
ABSTRACT:
BACKGROUND OF THE INVENTION
Basic skin cleansing activities have been long addressed by the personal care industry. Removing soil from the skin is a worldwide requirement of the consumer population that has been met by the available skin cleansing products. The consumer population is now looking for additional benefits beyond basic cleansing. Skin conditioning i.e. smoothness, texture, etc., is a desired characteristic and brought about through the presence of emollients in a basic skin cleansing composition. Additionally, the presence of components which bring about an antibacterial effect on the skin are now becoming ever more acceptable and desirable by the consumer population.
Delivering a benefit to the skin other than cleansing during the cleansing process has been receiving increasing attention in the last few years. For example, the disclosure of dual compartment delivery systems to deliver benefit agents to the skin as well as larger sized droplets of the benefit agent are now known. However, in order to achieve these results the composition must be compatabilized, as assessed by stability parameters over a period of time and a range of temperatures. Such parameters include maintenance and stabilization of visual phase integrity. These parameters are particularly significant for liquid compositions wherein the large quantity of water make the establishment of a stable composition more difficult, particularly when substantially water insoluble benefit agents are dispersed in water and desirably form an emulsion, more desirably an oil in water emulsion.
It has now been found that a liquid aqueous composition suitable for cleansing the skin and comprising
a. a skin cleansing effective amount of a surfactant or mixtures thereof;
b. a silicone;
c. a hydrocarbonaceous material;
d. a cationic polymer; and
e. the balance water can be successfully stabilized with respect to phase dispersion by the addition of a combination of two separate polymers, each being an acrylates/C
10-30
alkyl acrylate cross polymer, the polymer being a copolymer of C
10-30
alkyl (meth)acrylates and one or more monomers of acrylic acid, methacrylic acid or one of their simple esters such as methyl, ethyl or propyl, cross linked with an allylic ether of a multi hydroxy compound such as sucrose, pentaerythritol, trimethylolpropane and the like. The first cross polymer has a viscosity of at least about 10,000 centipoise (cps) to not more than about 30,000 centipoise for a 1% dispersion of the polymer in water and neutralized to about pH 7. An example of this polymer is Pemulen TR1 obtained from Goodrich. The second polymer is a cross polymer having a viscosity of at least 40,000 centipoise for a 1% dispersion of the polymer in water and neutralized to a pH of about 6. An example of this polymer is Carbopol ETD 2020 available from Goodrich.
The use of the two-phase stabilizers provides a tight stable multi-phased composition over a reasonable range of variables including temperature and visual assessment of phase integrity and emulsification.
The stabilization of this silicone, hydrocarbonaceous, particularly petrolatum emulsion, is complex and complicated due to the necessary presence of the two nonaqueous water insoluble components—silicone and hydrocarbonaceous component. These materials appear to operate independently and can form separate dispersed drops of significantly different sizes. Through the stabilization system of this invention an emulsion can be prepared which does not readily break apart, and is temperature and shear stable and maintains itself at a relatively high temperature over a significant period of time.
The desired composition is stabilized as to visual phase integrity with the two polymers as exemplified by Pemulen TR1 and Carbopol ETD 2020. Since neither one of these two agents alone stabilize the composition at the quantities employed for each alone, there may be an unknown interaction occurring among the composition components. The usage of these two agents together bring about a composition which maintains phase integrity over a specific period of time and a wide temperature range.
It has also been determined that the presence of the monoester or multiester of long chain acids such as oleic, lauric, palmitic, stearic and the like with hexitol anhydrides derived from sorbitol is very helpful in solubilizing the two stabilizing polymers as exemplified by Pemulen TR1 and Carbopol ETD 2020 in the oil phase when preparing the composition. Without this component, solubilization is very slow. Examples of such ester are Span 20, 40, 60, 65, 80 and 85 all available from ICI. In general, these esters arise from ester formation from an alkyl or alkenyl carboxylic acid of about 10 to about 20 carbon atoms and a hexitol anhydride derived from sorbitol.
SUMMARY OF THE INVENTION
In accordance with the invention there is a liquid aqueous composition suitable for skin cleansing comprising
a. a skin cleansing effective amount of a surfactant or mixture thereof;
b. a silicone in quantities of from about 0.1 to about 8 wt. % of the composition;
c. a hydrocarbonaceous material in quantities of from about 0.1 to about 8 wt. % of the composition;
d. a cationic polymer in quantities of from about 0.02 to about 1 wt. % of the composition;
e. a combination two separate polymers, each being an acrylates/C
10-30
alkyl acrylate cross polymer, the polymer being a copolymer of C
10-30
alkyl (meth)acrylates and one or more monomers of acrylic acid, methacrylic acid or one of their simple esters such as methyl, ethyl or propyl, cross linked with an allylic ether of a multi hydroxy compound such as sucrose, pentaerythritol and trimethylolpropane and the like, the first cross polymer has a viscosity of at least about 10,000 centipoise (cps) to not more than about 30,000 centipoise for a 1% dispersion of the polymer in water and neutralized to about pH 7, and the second polymer is a cross polymer having a viscosity of at least about 40,000 centipoise for a 1% dispersion of the polymer in water and neutralized to a pH of about 6, in quantities sufficient to provide phase stabilization; and
f. the balance, water.
It has also been determined that the presence of the monoester or multiester of long chain acids such as oleic, lauric, palmitic, stearic and the like with hexitol anhydrides derived from sorbitol is very helpful in solubilizing the two stabilizing polymers as exemplified by Pemulen TR1 and Carbopol ETD 2020 in the oil phase when preparing the composition. Without this component, solubilization is very slow. Examples of such ester are Span 20, 40, 60, 65, 80 and 85 all available from ICI.
The desired composition will have appropriate visual phase stability.
DETAILED DESCRIPTION OF THE INVENTION
In line with the cleansing activity of the composition, there is a skin cleansing effective amount of a surfactant present in the composition. Soap, a long chain alkyl or alkenyl, branched or normal carboxylic acid salt such as sodium, potassium, ammonium or substituted ammonium salt, can be present in the composition. Exemplary of long chain alkyl or alkenyl are from about 8 to about 22 carbon atoms in length, specifically about 10 to about 20 carbon atoms in length, more specifically alkyl and most specifically normal, or normal with little branching. Small quantities of olefinic bond(s) may be present in the predominantly alkyl sections, particularly if the source of the “alkyl” group is obtained from a natural product such as tallow, coconut oil and the like. Because of its potential harshness soap is not a preferred surfactant and can be omitted from the composition.
Other surfactants can be present in the composition as well. Examples of such surfactants are the anionic, amphoteric, nonionic and cationic surfactants. Examples of anionic surfactants include but are not limited to alkyl sulfates, anionic acyl sarcosinates, methyl acyl taurates, N-acyl glutamates, acyl isethionates, alkyl sulfosuccinates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, trideceth sulfates, protein condensates, m
Dehan Louis
Juprelle Didier
Baranc{acute over (i)}k Martin B.
Colgate-Palmolive Company
Gupta Yogendra
Ingersoll Christine
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