Liquid compositions comprising stable emulsion of small particle skin benefit agent

• US 6,126,954 A
• Filed: 04/05/1999
• Issued: 10/03/2000
• Est. Priority Date: 04/05/1999
• Status: Expired due to Fees

• Current Assignee: Unilever Home & Personal Care USA (Unilever PLC)
• Original Assignee: Unilever Home & Personal Care USA (Unilever PLC)
• Inventors: Tsaur, Liang Sheng
• Primary Examiner(s): Harrison, Robert H.
• Application Number:
  US09/286,041
• Time in Patent Office: 547 Days
• Field of Search: 424/70.11, 424/70.13, 424/70.21, 424/70.22, 424/70.31, 424/78.02, 424/78.03, 424/401, 510/119, 510/121, 510/123, 510/129, 510/130, 510/159, 510/405, 510/475, 514/846
• US Class Current: 424/401
• CPC Class Codes: A61K 2800/412 Microsized, i.e. having sizes between 0.1 and 100 microns
• CPC Class Codes: A61K 2800/5426 cationic
• CPC Class Codes: A61K 2800/596 Mixtures of surface active compounds
• CPC Class Codes: A61K 2800/654 The particulate/core comprising macromolecular material
• CPC Class Codes: A61K 8/025 Explicitly spheroidal or spherical shape
• CPC Class Codes: A61K 8/044 Suspensions
• CPC Class Codes: A61K 8/442 substituted by amido group(s)
• CPC Class Codes: A61K 8/463 containing sulfuric acid derivatives, e.g. sodium lauryl sulfate
• CPC Class Codes: A61K 8/737 Galactomannans, e.g. guar; Derivatives thereof
• CPC Class Codes: A61Q 19/10 Washing or bathing preparations
• CPC Class Codes: C11D 1/126 Acylisethionates
• CPC Class Codes: C11D 1/29 Sulfates of polyoxyalkylene ethers
• CPC Class Codes: C11D 1/90 Betaines
• CPC Class Codes: C11D 1/94 Mixtures with anionic, cationic or non-ionic compounds
• CPC Class Codes: C11D 17/0013 Liquid compositions with insoluble particles in suspension C11D17/0021, C11D17/0026, C11D17/003 take precedence
• CPC Class Codes: C11D 3/227 with nitrogen-containing groups
• CPC Class Codes: C11D 3/373 containing silicones
• CPC Class Codes: C11D 3/3742 Nitrogen containing silicones
• CPC Class Codes: C11D 3/38 Products with no well-defined composition , e.g. natural products

Abstract

A stable aqueous liquid comprising surfactant, dispersed cationic polymer particle and small particle benefit agent. The dispersed polymer interacts with the benefit agent, without need of additional structurant to stabilize particles in solution. Further, upon dilution, enhanced cationic deposition is achieved.

Claims

1. An aqueous liquid composition comprising:

(a) 5 to 45% by wt. of a surfactant selected from the group consisting of anionic surfactant, amphoteric surfactant, nonionic surfactant and mixtures thereof;

(b) 0.1 to 5.0% by wt. dispersed cationic polymer particles having a particle size of about 1 to about 200 micrometers;

(c) 1 to 30% by wt. of a skin benefit agent emulsion having a particles size in the range of about 0.1 to about 10 micrometers;

(d) 1 to 30% by wt. of water soluble skin benefit agent;

wherein upon dilution of the liquid composition with water, said dispersed cationic polymer particle (b) dissolves and interacts with said skin benefit agent emulsion (c) to form emulsion/polymer aggregates having a length larger than about 50 micrometers.

2. A composition according to claim 1 comprising 5 to 35% by wt. surfactant.

3. A composition according to claim 1, wherein cationic polymer is an amphoteric polymer containing a cationic and anionic group wherein the polymer has a net cationic charge.

4. A composition according to claim 1, wherein cationic polymer is added to the composition as a pre-dispersion prepared by mixing a solid cationic polymer with water soluble ingredients;

with low viscosity oils;

or with aqueous solution under such conditions that the polymer particles will not dissolve.

5. A composition according to claim 4, wherein said pre-dispersion has a viscosity of less than 100,000 centipoise.

6. A composition according to claim 1, wherein cationic polymer has particle size of 1 to 100 micrometer.

7. A composition according to claim 1, wherein the skin benefit agent from emulsion (c) has particle size of 0.1 to 5 micrometers.

8. A composition according to claim 1 containing 0.3 to 5% by wt. cationic polymer.

9. A composition according to claim 1, where benefit agent emulsion (c) comprises 3 to 25% by wt. of composition.

10. A composition according to claim 1, comprising substantially no structurants.

11. A composition according to claim 1, wherein said water soluble benefit agent (d) is a polyhydroxy alcohol.

12. A composition according to claim 11, wherein said alcohol is selected from the group consisting of glycerol, sorbitol and polyalkylene glycol.

13. A composition according to claim 1 comprising 3 to 20% by wt water soluble skin benefit agent.

14. A process for enhancing deposition of oil/emollient droplets having a particle size of 0.1 to 10 micrometers which process comprises:

(a) combining said oil droplets with dispersed cationic polymer in an aqueous solution to form dispersed oil and dispersed cationic polymer in an aqueous surfactant solution; and

(b) diluting said aqueous surfactant solution such that dispersed cationic polymer particles dissolve and induce formation of cationic polymer/oil aggregates having length greater than 50 micrometers.