# US 7,407,665 B2 · Skin care cosmetic compositions and methods for microemulsification of sebum on contact

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- Number: US 7,407,665 B2
- Document ID: US7407665B2
- Status: Granted
- Kind: B2
- Application number: 10/648,695
- Filed: 2003-08-27
- Published: 2005-03-03
- Granted: 2008-08-05
- Earliest claimed: 2003-08-27
- Assignees: Unilever Home & Personal Care USA, Division of Conopco, Inc.
- Inventors: Lei Huang; Carlos Co; Alexander Lips
- Web page: https://patentgrep.com/patent/US7407665B2

## CPC

- A61K 8/068: {Microemulsions}
- A61K 8/90: Block copolymers (A61K8/89 takes precedence)
- A61Q 19/00: Preparations for care of the skin
- A61Q 19/10: Washing or bathing preparations
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

A combination of a non-ionic tri-block poly-propylene-oxide, poly-ethylene-oxide alcohol ether surfactant coupled with block polymer poly(Butadiene-b-Ethylene Oxide) is an excellent surfactant phase to micro-emulsify sebum on contact. A method of micro-emulsification of sebum on contact with inventive compositions according to the present invention will form micro-emulsions which can enhance (1) deep pore cleansing of skin and (2) delivery of skin benefit actives into the skin.

## Claims

### Claim 1

A skin care cosmetic composition comprising:
(i) about 1% to about 40% of a compound having the formula A:
CH3—(CH2)7—O—PO9—EO5—H (A)
wherein:
O is an oxygen atom;
PO is a propylene oxide group;
EO is an ethylene oxide group;
(ii) about 0.1% to about 0.6% of poly(Butadiene-Ethylene Oxide) wherein said poly-Butadiene chain has a molecular weight of about 1,000 to about 10,000; and wherein said poly-Ethylene Oxide chain has a molecular weight of about 1,000 to about 20,000; and
(iii) a cosmetically acceptable vehicle;
wherein the composition forms a micro-emulsion with sebum.

### Claim 2 (depends on 1)

The skin care cosmetic composition of claim 1 wherein the compound of formula A comprises about 12% to about 35% of said composition.

### Claim 3 (depends on 1)

The skin care cosmetic composition of claim 1 wherein the compound of formula A comprises about 12% of said composition.

### Claim 4 (depends on 1)

The skin care cosmetic composition of claim 1 wherein said poly(Butadiene-b-Ethylene Oxide) has a polydispersity of about 1.04.

### Claim 5 (depends on 1)

The skin care cosmetic composition of claim 1 wherein the poly(Butadiene-b-Ethylene Oxide) comprises about 0.25% of said composition.

### Claim 6 (depends on 1)

The composition of claim 1, further comprising an astringent salt.

### Claim 7 (depends on 6)

The composition of claim 6, wherein said astringent salt is selected from the group consisting of aluminum hydroxide, aluminum halides, aluminum hydroxyhalides, zirconyl oxyhalides, zirconyl hydroxyhalides and mixtures thereof.

### Claim 8 (depends on 6)

The skin care cosmetic composition of claim 6, wherein said astringent salt is selected from the group consisting of an aluminum salt having the general formula Al2(OH)xQy—XH2O; wherein Q is chlorine, bromine or iodine; wherein x is 2 to 5 and x+y=6 and x and y do not need to be integers; and wherein X is about 1 to about 6.

### Claim 9 (depends on 6)

The skin care cosmetic composition of claim 6, wherein said astringent salt is selected from the group consisting of aluminum chloride, aluminum chlorohydrate, aluminum chlorohydrex, aluminum chlorohydrex PEG, aluminum chlorohydrex PG, aluminum dichlorohydrate, aluminum dichlorohydrex PEG, aluminum dichlorohydrex PG, aluminum sesquichlorohydrate, aluminum sesquichlorohydrex PEG, aluminum sesquichlorohydrex PG, aluminum sulfate, aluminum zirconium octachlorohydrate, aluminum zirconium octachlorohydrex GLY, aluminum zirconium pentachlorohydrate, aluminum zirconium pentachlorohydrex GLY, aluminum zirconium tetrachlorohydrate, aluminum zirconium trichlorohydrate, aluminum zirconium tetrachlorohydrate GLY, and aluminum zirconium trichlorohydrate GLY, and mixtures thereof.

### Claim 10 (depends on 1)

The skin care cosmetic composition of claim 1, wherein said composition is a leave-on composition.

### Claim 11 (depends on 1)

A cosmetic method of microemulsifying sebum by applying to the skin the composition of claim 1.