Method and Composition for Evenly Applying Water Soluble Actives

• US 20100234474A1
• Filed: 03/11/2009
• Published: 09/16/2010
• Est. Priority Date: 03/11/2009
• Status: Active Grant

• Current Assignee: Conopco (Unilever PLC)
• Original Assignee: Conopco (Unilever PLC)
• Inventors: Qiu, Qiang, Lou, Anjing
• Granted Patent: US 8,299,127 B2
• Time in Patent Office: Days
• US Class Current: 514/675
• CPC Class Codes: A61K 8/06 Emulsions
• CPC Class Codes: A61K 8/35 Ketones, e.g. benzophenone
• CPC Class Codes: A61K 8/891 saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
• CPC Class Codes: A61K 8/894 modified by a polyoxyalkylene group, e.g. cetyl dimethicone copolyol
• CPC Class Codes: A61K 8/895 containing silicon bound to unsaturated aliphatic groups, e.g. vinyl dimethicone
• CPC Class Codes: A61Q 19/04 for chemically tanning the skin topical sun or radiation screening or tanning preparations A61Q17/04

Abstract

A method and composition for evenly applying water soluble actives is described. The method includes applying a composition with a HIPE to skin and generating a film having a hydrophilic surface so that composition and active can be evenly applied.

Claims

1. A method for evenly applying a water soluble active, the method comprising the steps of:

(a) applying to dry skin a topical composition comprising a water-in-oil HIPE, the HIPE comprising;

1) water;

2) emulsifier;

3) steric stabilizer;

4) depletion stabilizer;

5) oil;

6) non-emulsifying elastomer, and

7) water soluble active; and

(b) shearing the topical composition during application onto the skin resulting in free water creating a hydrophilic surface on the topical composition applied while simultaneously maintaining water in the HIPE for the water soluble active

wherein the topical composition, prior to applying, has a contact angle against water which is greater than about 90° and

less than about 70°

immediately after topically applying with shear.

2. The method according to claim 1 wherein the contact angle of the composition is from about 55 to about 70°

immediately after topically applying the composition with shear.

3. The method according to claim 1 wherein the emulsifier has an HLB of less than about 9 and makes up from about 0.5 to about 10% by weight of the HIPE.

4. The method according to claim 1 wherein the steric stabilizer is cross-linked dimethicone elastomer.

5. The method according to claim 1 wherein the depletion stabilizer is an alkyl modified cross-linked dimethicone elastomer.

6. The method according to claim 1 wherein water exits the HIPE of the composition to create a hydrophilic surface on the composition during application.

7. The method according to claim 1 wherein additional composition having a hydrophobic exterior is applied and slips over hydrophilic surface of previously applied composition.

8. The method according to claim 1 wherein from about 45 to about 75% by weight water in the topical composition is lost after about 200 seconds from application.

9. The method according to claim 1 wherein water soluble active is evenly distributed in the absence of generating a wet-feeling sensation.

10. The method according to claim 1 wherein the water soluble active is DHA.

11. The topical composition comprising a HIPE as used in the method of claim 1.

12. The topical composition comprising according to claim 11 wherein the topical composition is externally hydrophobic before application and externally hydrophilic after application with shear.

13. The composition according to claim 11 wherein the composition has a contact angle against water of greater than about 90°

before application and from about 55 to about 70°

immediately after application with shear.