Water in oil emulsion compositions containing sunscreen actives and siloxane elastomers

• US 20070274932A1
• Filed: 05/15/2007
• Published: 11/29/2007
• Est. Priority Date: 05/15/2006
• Status: Abandoned Application

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Tanaka, Hidekazu, Yoshimi, Naohisa, Suginaka, Yasuko
• Application Number:
  US11/803,534
• Publication Number:
  US 20070274932A1
• Time in Patent Office: Days
• US Class Current: 424/59
• CPC Class Codes: A61K 8/064 Water-in-oil emulsions, e.g. Water-in-silicone emulsions
• 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 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations

Abstract

The present invention relates to water in oil emulsion compositions suitable for use as sunscreen comprising: from about 0.1% to about 15% of an emulsifying crosslinked siloxane elastomer; from about 1% to about 40% of a solvent for the emulsifying crosslinked siloxane elastomer; from about 0.01% to about 5% of an additional emulsifier; from about 50% to about 99% of aqueous phase; and from about 0.01% to about 30% of a sunscreen active; wherein when shear stress is applied to the composition during spreading on skin, aqueous phase is released from the emulsion.

Claims

1. A water in oil emulsion composition suitable for use as a sunscreen comprising:

a) from about 0.1% to about 15% of an emulsifying crosslinked siloxane elastomer;

b) from about 1% to about 40% of a solvent for the emulsifying crosslinked siloxane elastomer;

c) from about 0.01% to about 5% of an additional emulsifier;

d) from about 50% to about 99% of aqueous phase;

e) from about 0.01% to about 30% of a sunscreen active;

wherein when shear stress is applied to the composition during spreading on skin, aqueous phase is released from the emulsion.

2. The composition according to claim 1 wherein the sunscreen active is selected from the group consisting of avobenzone, homosalate, octocrylene, 2-ethylhexyl-p-methoxycinnamate, 2-hydroxy-4-methoxybenzophenone, 2-ethylhexyl-salicylate, phenyl benzimidazole sulfonic acid, benzophenone-4, and mixtures thereof.

3. The composition according to claim 1 wherein the emulsifying crosslinked siloxane elastomer is selected from the group consisting of dimethicone copolyol crosspolymer, lauryl dimethicone copolyol crosspolymer, and mixtures thereof.

4. The composition according to claim 1 further comprising a skin care active selected from the group consisting of niacinamide, hexamidine compounds, whitening agents, peptides, sugar amines, and mixtures thereof.

5. The composition according to claim 4 wherein the skin care active is niacinamide.

6. The composition according to claim 1 further comprising a skin conditioning agent.

7. A composition according to claim 6 wherein the skin conditioning agent is selected from the group consisting of propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol, sorbitol, hydroxypropyl sorbitol, trehalose, hexylene glycol, 1,3-butylene glycol, 1,2,6-hexanetriol, glycerin, 1,2-hexanediol, pentylene glycol, ethoxylated glycerin, propoxylated glycerin, and mixtures thereof.

8. A composition according to claim 7 wherein the skin conditioning agent is glycerin.

9. A composition according to claim 1 further comprising a particulate material.

10. The composition of claim 1 further comprising from about 0.1% to about 15% of a non-emulsifying crosslinked siloxane elastomer.

11. The composition according to claim 10, wherein the non-emulsifying crosslinked siloxane elastomer is selected from the group consisting of dimethicone/vinyl dimethicone crosspolymers, and mixtures thereof.

12. A composition according to claim 1, wherein the solvent for the elastomer is selected from the group consisting of volatile, non-polar oils;

non-volatile, polar oils;

non-volatile, non-polar oils;

non-volatile paraffinic hydrocarbon oils; and

mixtures thereof.

13. A composition according to claim 1, wherein the composition further comprises from about 0.1% to about 50% of an additional skin care active selected from the group consisting of oil-soluble terpene alcohols, phytosterol, oil-soluble vitamin compounds, emollients and occlusives, dehydroacetic acid, hexanediol, anti-acne actives, beta hydroxy acids, chelators, flavonoids, anti-inflammatory agents, anti-cellulite agents, topical anesthetics, anti-oxidants/free radical scavengers, tanning actives, skin soothing and healing agents, anti-microbial actives, anti-fungal actives, and mixtures thereof.

15. A method for protecting the skin against sun damage, said method comprising applying to the skin of a human in need of treatment, a safe and effective amount of a composition according to claim 1 or claim 14.

14. A water in oil emulsion composition suitable for use as a sunscreen comprising:

a) from about 0.1% to about 15% of an emulsifying crosslinked siloxane elastomer;

b) from about 1% to about 40% of a solvent for the emulsifying crosslinked siloxane elastomer;

c) from about 0.01% to about 5% of an additional emulsifier;

d) from about 50% to about 99% of aqueous phase;

e) from about 0.01% to about 30% of a sunscreen active;

wherein the composition releases at least about 5.0% of aqueous phase from the bulk material collected at the outlet of the mill after milling for about 10-15 seconds at a speed of about 6500 rpm according to the Milling Method described herein.