Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-02-28
2002-05-28
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S158000, C510S159000, C510S417000, C510S473000, C510S474000
Reexamination Certificate
active
06395691
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to liquid personal wash compositions to effectively deposit solid particles comprising (a) surfactant (synthetic surfactant with or without soap); (b) large particle-in-oil dispersions comprising (i) a solid particle (0.1 to 150 microns, preferably 0.2 to 100 microns) or (ii) a capsule in either petrolatum or in a hydrocarbon oil which is thickened or structured with an oil-mixable polymer; and (c) water soluble thickener mixable with the surfactant (e.g., concentrated surfactant) which can prevent physical separation of the large particle-in-oil dispersions (dispersions having size greater than 50 microns) and are capable of preventing separation of large particle-in-oil dispersions for over 3 months.
BACKGROUND
Deposition of emollient oils from liquid cleansers can be achieved using small droplet deposition assisted with cationic polymer or by using large drops. However, deposition of solid particles (e.g., hydrophilic particle) from a cleansing product (e.g., wash-off cleanser) remains technically challenging.
U.S. Pat. No. 5,661,189 to Grieveson discloses an aqueous liquid and a moisturizing composition containing emollients thickened with a hydrophobic thickener which emollients have a particle in the range of 50-500 &mgr;. These are thickened particles, not particle in oil dispersions.
U.S. Pat. No. 5,804,540 to Tsaur discloses personal wash liquids comprising low viscosity oils pre-thickened by non-antifoaming hydrophobic polymers.
Again, the reference fails to teach or suggest solid cosmetic particles or capsules as particle-in-oil dispersions. Further, there is no disclosure of a particle-in-oil dispersion in a surfactant system comprising water soluble thickener mixable with surfactant.
U.S. Pat. No. 5,869,070 to Dixon et al. discloses stable liquid cleansing compositions with skin moisturizing agent and gel forming polymer. Skin moisturizing agents are petrolatum, polybutene and mixtures of petrolatum/polybutene with ratio of 3:1 to 5:1.
The reference fails to disclose solid, particle (e.g., cosmetic particle) in oil or capsules in oil. Further, although petrolatum/polybutylene is disclosed as moisturizer, there is no teaching or suggestion of a separate oil thickened by petrolatum/polybutylene. Finally, there is no teaching or suggestion of particle-in-oil found in a thickened/concentrated surfactant system.
U.S. Pat. No. 5,912,002 to Grieveson et al. discloses cleansing composition comprising surfactant and internal emulsion comprising cosmetic agent, emulsifier and carrier.
Grieveson differs from the compositions of the invention in that compositions of the subject invention require that the oil (of “particle in oil”) is capable of separating and entrapping solid particles in presence of concentrated surfactant solution and without need of emulsifier. By contrast, Grieveson is an oil-in-oil emulsion where stability is achieved only by using an emulsion. Further, the oil (carrier oil) of Grieveson can be any oil in the range of 200 to 500,000 centistokes at 25° C while, in the subject invention, oil viscosity must be higher than 10,000 centistokes at 0.1 S
−1
.
BRIEF SUMMARY OF THE INVENTION
Unexpectedly, applicants have now found a superior way to deliver (a) solid particles; and/or (b) capsule (e.g., perfume-containing capsules) from a wash-off liquid by forming a particle-in-oil dispersion; wherein particle refers to any of (a) or (b) above; wherein the oil is petrolatum; or emollient oils which contain an oil mixable polymer; and wherein the surfactant system in which the particle-in-oil dispersion is found is thickened/concentrated (e.g., with xanthan gum or other thickener). The particle-in-oil dispersion remains stable at room temperature for greater than 3 months with no visible physical separation and, in use, deposits far greater amounts of solid particle/capsule from a wash-off liquid composition than would be possible if the particles were added alone rather than as particle-in-oil dispersion.
More specifically, the invention comprises:
A personal liquid composition comprising:
(1) 5% to 30%, preferably 8% to 25% by wt. of a surfactant selected from the group consisting of anionic surfactants, amphoteric surfactants, nonionic surfactants, cationic surfactants and mixtures thereof;
(2) 0.5% to 5% by wt. of a water soluble thickener mixable with said surfactant(s) and which prevents physical separation of a particle-in-oil dispersion as noted in (3) below from the liquid cleanser for three months or more as measured at room temperature; and
(3) 2% to 20% by wt. of said particle-in-oil dispersion comprising:
(a) 60% to 99% by wt. of said dispersion of petrolatum; or hydrocarbon oil containing oil mixable polymer, wherein said petrolatum or polymer containing oil can suspend solid particles having density greater than 1.05 (without need of an emulsifier, although such emulsifier may be optionally added if desired);
(b) 1% to 40% by wt. of a “particle” selected from the group consisting of (i) solid particles with particle size in range 0.1 to 250, preferably 0.2 to 100 microns; and (ii) capsules with size in the range of 1-200 microns,
wherein the particle-in-oil dispersion is itself stable at room temperature for over 3 months;
wherein the particle-in oil dispersion has size of about 50 to 5000 microns, preferably 100-1000 microns; and
wherein particle-in-oil dispersion is stable in the composition for three months or more at R.T.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to compositions for delivering solid particles (preferably hydrophilic solid particles) and/or capsules (e.g., perfume-containing capsules) from wash off liquid compositions. These “particles” (referring generally to the solid particles, and capsules) are delivered from relatively large size (50 to 5000 microns), stable (for at least three months at room temperature), particle-in-oil dispersions found in thickened/concentrated surfactant compositions wherein the entire composition (containing particle-in-oil dispersion) is itself stable for three months at room temperature.
The compositions, as described below, will be defined by (a) surfactant system; (2) thickening system for said surfactant system; and (3) particle-in-oil composition wherein the particle-in-oil composition is itself defined by (a) particles (e.g., solid particle or capsules) and (b) oil in which particles are found. The oil is petrolatum; or oil containing oil-mixable polymers to help further suspend/stabilize particles.
The invention is thus defined in more detail below.
SURFACTANT SYSTEM
The composition of the invention comprises 5 to 30% by wt. surfactant. The surfactants in the composition may be anionic, nonionic, amphoteric/zwitterionic, cationic or mixtures thereof.
The anionic surfactant may be, for example, an aliphatic sulfonate, such as a primary alkane (e.g., C
8
-C
22
) sulfonate, primary alkane (e.g., C
8
-C
22
) disulfonate, C
8
-C
22
alkene sulfonate, C
8
-C
22
hydroxyalkane sulfonate or alkyl glyceryl ether sulfonate (AGES); or an aromatic sulfonate such as alkyl benzene sulfonate.
The anionic may also be an alkyl sulfate (e.g., C
12
-C
18
alkyl sulfate) or alkyl ether sulfate (including alkyl glyceryl ether sulfates). Among the alkyl ether sulfates are those having the formula:
RO(CH
2
CH
2
O)
n
SO
3
M
wherein R is an alkyl or alkenyl having 8 to 18 carbons, preferably 12 to 18 carbons, n has an average value of greater than 1.0, preferably between 2 and 3; and M is a solubilizing cation such as sodium, potassium, ammonium or substituted ammonium. Ammonium and sodium laurel ether sulfates are preferred.
These differ from ether sulfates of the invention in that they are not branched.
The anionic may also be alkyl sulfosuccinates (including mono- and dialkyl, e.g., C
6
-C
22
sulfosuccinates); alkyl and acyl taurates, alkyl and acyl sarcosinates, sulfoacetates, C
8
-C
22
alkyl phosphates and phosphates, alkyl phosphate esters and alkoxyl alkyl phosphate esters, acyl lactates, C
8
-C
22
monoalkyl succinates and ma
Koatz Ronald A.
Ogden Necholus
Unilever Home & Personal Care USA , division of Conopco, Inc.
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