Dual chamber cleansing system, comprising multiple emulsion

Details Dual chamber cleansing system, comprising multiple emulsion Dual chamber cleansing system, comprising multiple emulsion

1999-10-22

2001-07-31

Kopec, Mark (Department: 1751)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

For cleaning a specific substrate or removing a specific...

C510S137000, C510S159000, C510S417000, C510S438000, C510S466000

Reexamination Certificate

active

06268322

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a composition for depositing water soluble benefit agents (e.g., glycolic acid, lactic acid, hydroxy caprylic acid, water soluble vitamins etc.) in greater amounts than previously possible when using PW shower gel type liquids and/or facial cleansers while maintaining good foam stability. Specifically, the invention relates to a dual chamber system in which one composition/stripe comprises a surfactant; and a separate composition/stripe, which is co-dispensed, comprises a multiple emulsion which in turn comprises a benefit agent emulsion (e.g., water soluble glycolic acid in oil) emulsified in a water solution containing additional water soluble benefit agent (e.g., glycerol, PEGs, PPG, etc.)
BACKGROUND OF THE INVENTION
It is greatly desirable to deposit water soluble benefit agents (e.g., glycolic acid; lactic acid) on the skin or other substrate.
However, deposition of water soluble benefit agent is extremely difficult to accomplish, particularly from wash-off type products (e.g., shower gels) because the water soluble benefit agent will essentially wash off when the user rinses with water. In general, although there are still problems with shower gel products, it is much easier to deposit a hydrophobic benefit agent (e.g., silicone or petrolatum) than a hydrophilic one.
Unexpectedly, applicants have found that, by forming a multiple emulsion of a water soluble benefit agent and separately dispensing the water soluble benefit agent containing multiple emulsion in one stripe and a surfactant containing composition in another, applicants have been able to deposit greater amounts of water soluble benefit agent than otherwise achievable (e.g., either through single stripe cleanser or through dual stripe cleanser having only oil in water emulsion rather than water-in-oil-in-water emulsion of invention).
The use of separate surfactant and benefit agent stripes is not itself new. U.S. Pat. No. 5,612,307 to Chambers et al., for example, teaches a dual chamber package comprising separate surfactant and benefit agent stripe. The benefit agent, however, is a lipophilic benefit agent rather than a water-soluble one and further is not in the multiple emulsion form of the multiple emulsion stripe of the invention.
Multiple emulsion like those of the invention are taught in applicants' copending application entitled “Stable Multiple Emulsion Composition” to Naser et al. filed on the same date as the subject application, but this reference does not teach the dual chamber dispensing system of the subject invention.
BRIEF SUMMARY OF THE INVENTION
Unexpectedly, applicants have found that a dual chamber dispenser comprising a surfactant containing stripe on one side and a multiple emulsion containing stripe on the other (wherein the emulsion is a water in oil in water emulsion and wherein the internal water phase contains at least one water soluble benefit agent) is able to deliver water soluble benefit agent to the skin or other substrate in greater amounts than otherwise possible, i.e., using single stripe or using different type of emulsion in the two stripe system such as oil in water only.
Specifically, the invention comprises:
An aqueous liquid cleansing and moisturizing composition comprising an at least dual chamber dispenser (in theory more than two stripes may be dispensed and the invention is not necessarily limited by the number of stripes) comprising:
(A) 10 to 99.9% by wt., preferably 30 to 99.9%, more preferably 50 to 99.9% of a surfactant containing stripe wherein about 1 to 75%, preferably 5 to 70% of said surfactant stripe comprises a surfactant selected from the group consisting of anionic, nonionic, zwitterionic and cationic surfactants, soap and mixtures thereof (water, solute, opacifier, bactericides and other standard ingredients may also be found in the stripe); and
(B) 0.1 to 90%, preferably 0.1 to 70%, more preferably 0.1 to 50% by wt. of a multiple emulsion stripe comprising:
(1) 1 to 99%, preferably 2 to 90% of said multiple emulsion of a water in oil (W
1
/O) emulsion comprising:
(a) about 1 to 99% of an internal aqueous phase comprising water, optional solute (0.01 to 30% solute) and optional surfactant (0 to 30%);
(b) 0.5 to 99%, preferably 1 to 80% of the emulsion of an oil phase surrounding said internal aqueous phase comprising a non-volatile silicone compound, a volatile hydrocarbon compound, a non-volatile hydrocarbon compound or a mixture thereof;
(c) about 0.1 to 20%, preferably 1 to 15% of a low HLB emulsifier (e.g., HLB under 10); and
(d) an effective amount (e.g., 0.01 to 40%, preferably 0.05 to 15%) of a topically effective water-soluble compound (e.g., glycolic acid) found in the internal aqueous phase; and
(2) 1 to 99%, preferably 20 to 95% of said multiple emulsion of an external aqueous phase W
2
comprising:
(a) 0 to 30%, preferably 0.01 to 5% of a high (10-30) HLB nonionic surfactant (e.g., Brij 58) which may be used to stop oil in the oil phase from leaking out of the W
2
phase to form separate oil layer;
(b) 0 to 60%, preferably 10 to 50% second topically active compound (e.g., glycerin);
(c) optional solute; and
(d) 0 to 20% optional cleansing surfactant or surfactants wherein, if anionic, the surfactant is a non-amido surfactant.
As noted, the W
2
phase could be nothing but water.
Also, as noted in applicants co-pending application filed on same date, if predominantly anionic (>60%) in W
2
phase, a nonionic gum polymer is preferably present in W
2
and, if W
2
is predominantly amphoteric (>50%), an anionic gum polymer is preferably present.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an at least dual chamber dispenser comprising a surfactant containing stripe on one side ((A) above) and a multiple emulsion containing stripe ((B) above) on the other. The multiple emulsion is a water in oil in water emulsion (W
1
-O—W
2
) wherein the internal water phase contains a water soluble benefit agent (e.g., glycolic acid). Each of the various components is described in greater detail below.
Surfactant Stripe
(Component (A))
One stripe of the dispenser of the invention is the surfactant stripe. The surfactant containing stripe is really not limited in any way and any viable surfactant system may be used although preferably this will be a “mild” surfactant system.
The surface active agent can be selected from any known surfactant suitable for topical application to the human body. As noted, mild surfactants, i.e., surfactants which do not damage the stratum corneum, the outer layer of skin, are particularly preferred.
On preferred anionic detergent is fatty acyl isethionate of formula:
RCO
2
CH
2
CH
2
SO3M
where R is an alkyl or alkenyl group of 7 to 21 carbon atoms and M is a solubilizing cation such as sodium, potassium, ammonium or substituted ammonium. Preferably at least three quarters of the RCO groups have 12 to 18 carbon atoms and may be derived from coconut, palm or a coconut/palm blend.
Another preferred anionic detergent is alkyl ether sulphate of formula:
RO(CH
2
CH
2
O)
n
SO
3
M
where R is an alkyl group of 8 to 22 carbon atoms, n ranges from 0.5 to 10 especially from 1.5 to 8, and M is a solubilizing cation as before.
Other possible anionic detergents include alkyl glyceryl ether sulphate, sulphosuccinates, taurates, sarcosinates, sulphoacetates, alkyl phosphate, alkyl phosphate esters and acyl lactylate, alkyl glutamates and mixtures thereof.
Sulphosuccinates may be monoalkyl sulphosuccinates having the formula:
R
1
O
2
CCH
2
CH(SO
3
M)CO
2
M;
and amino-MEA sulphosuccinates of the formula:
R
1
ONHCH
2
CH
2
O
2
CCH
2
CH(SO
3
M)CO
2
M;
wherein R
1
ranges for C
8
-C
20
alkyl preferably C
12
-C
15
alkyl and M is a solubilizing cation.
Sarcosinates are generally indicated by the formula:
R
2
CON(CH
3
)CH
2
CO
2
M,
wherein R
2
ranges from C
8
-C
20
alkyl, preferably C
12
-C
15
alkyl and M is a solubilizing cation.
Taurates are generally identified by the formula:
R
3
CONR
4
CH
2
CH
2
SO
3
M,
wherein R
3
ranges from C
8
-C
20
alkyl pref

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