Skin cleansing compositions comprising biodegradable abrasive particles

Patent metadata

Field	Value
Publication number	US-9616002-B2
Application number	US-201514624477-A
Country	US
Kind code	B2
Filing date	Feb 17, 2015
Priority date	Feb 17, 2014
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

The present invention relates to a skin cleansing composition, preferably a facial cleanser, comprising biodegradable abrasive particles having a mean Circularity of from about 0.60 to 0.90, a mean Solidity from about 0.60 to about 1.0, and a Biodegradable Rate of at least about 30% as determined after 28 days. In a preferred embodiment, the total skin cleansing composition has a Biodegradable Rate of at least 60% as determined after 90 days.

First claim

What is claimed is:

1. A skin cleansing composition comprising:
a) abrasive particles present at a level of from about 0.1% to about 10%, by weight of the composition, wherein said abrasive particles comprise:
i) a mean Circularity of from about 0.65 to about 0.90, as determined according to ISO 9726-6:2008;
ii) a mean Solidity from about 0.60 to about 1.0, as determined according to ISO 9276-6:2008;
iii) a Biodegradable Rate of about 30% to about 100%, as determined after 28 days according to the Biodegradability Test as disclosed herein; and
iv) a mean particle size as expressed by the area-equivalent diameter greater than 450 μm according to ISO 9276-6:2008;

b) a structuring agent; and
c) a dermatologically acceptable carrier;
wherein the composition comprises a viscosity from about 1000 cps to about 300,000 cps.

2. The skin cleansing composition according to claim 1 wherein said skin cleansing composition has a Biodegradable Rate of about 60% to about 100%, as determined after 90 days according to the Biodegradability Test as disclosed herein.

3. The skin cleansing composition according to claim 1 , wherein said abrasive particles have a mean particle size as expressed by the area-equivalent diameter of from about 450 μm to about 1,000 μm.

4. The skin cleansing composition according to claim 1 , wherein said abrasive particles have a Hardness of from about 35 to about 75 durometer as determined according to ASTM D2240-05 (2010).

5. The skin cleansing composition according to claim 1 , wherein said abrasive particles are selected from the group of polymeric material consisting of:
(a) one or more homo-polymers or co-polymers selected from the group consisting of polyhydroxy alkanoate (PHA), polylactic acid derivatives (PLA), polycaprolactone (PLC), poly(glycolic acid) (PGA), and blends thereof;
(b) aliphatic and aromatic co-polyesters selected from co-polyester containing succinic, adipic, terepthalic diacids, propanediol, butanediol, pentanediol monomer or blends thereof;
(c) starch, thermoplastic starch (TPS), or blends thereof;
(d) thermoplastic cellulose (TPC) derivative selected from the group consisting of cellulose ester, cellulose ether, cellulose alkanoate and blends thereof; and
(e) combinations of (a) to (d).

6. The skin cleansing composition according to claim 5 , wherein said polymeric material is polyhydroxy alkanoate (PHA) selected from the group consisting of poly-3-hydroxybutyrate (PHB), poly-3-hydroxyhexanoate, poly-3-hydroxy-valerate, poly-3-hydroxy-butyrate-co-3-hydroxyvalerate (PHBV), poly-3-hydroxybutyrate-co-3-hydroxyhexanoate, and blends thereof.

7. The skin cleansing composition according to claim 6 , wherein said polymeric material is poly-3-hydroxy-butyrate-co-3-hydroxyvalerate (PHBV).

8. The skin cleansing composition according to claim 1 , wherein said skin cleansing composition has a viscosity in the range of from about 5,000 cps to about 200,000 cps.

9. The skin cleansing composition according to claim 1 , wherein said skin cleansing composition has a pH in the range of from about 5 to about 8.

10. The skin cleansing composition according to claim 1 , wherein said skin cleansing composition is selected from the group consisting of a facial cleanser, body wash, hand cleanser and body cleanser.

11. The skin cleansing composition according to claim 1 , wherein said skin cleansing composition further comprises one or more actives selected from the group consisting of sugar amines, vitamins, oil control agents, photosterols, hexamidine compounds, tightening agents, anti-wrinkle actives, anti-atrophy actives, flavonoids, N-acyl amino acid compounds, retinoids, peptides, UV actives, photostabilizers, anti-cellulite agents, desquamation actives, anti-acne actives, anti-oxidants, radical scavengers, conditioning agents, anti-inflammatory agents, tanning actives, skin lightening agents, antiperspirant actives, sensates, anti-dandruff actives, anti-melanogenic agent, sebum secretion inhibitors, blood circulating facilitating agent, softeners, keratin protecting agents, emollients, moisturizers, and combinations thereof.

12. The skin cleansing composition according to claim 1 , wherein said skin cleansing composition further comprises thickening or suspending agents.

13. A method for cleansing or exfoliating a human's skin surface comprising contacting said skin surface with a skin cleansing composition according to claim 1 , wherein said skin cleansing composition is a facial cleanser and is topically applied onto said skin surface of a face, and additionally followed by a rinsing step.

Assignees

• Procter & Gamble

Inventors

• Gonzales Denis Alfred
• Groombridge Michael Leslie
• Mcdonnell Michael
• Glassmeyer Stephen Robert

Classifications

• A61K8/0245 Primary

  Specific shapes or structures not provided for by any of the groups of A61K8/0241 · CPC title

• A61K2800/28

  Rubbing or scrubbing compositions; Peeling or abrasive compositions; Containing exfoliants · CPC title

• A61K8/85

  Polyesters · CPC title

• A61Q19/10 Primary

  Washing or bathing preparations · CPC title

• A61K2800/60

  Particulates further characterized by their structure or composition · CPC title