Silicone containing personal care products

• US 5,302,382 A
• Filed: 06/03/1993
• Issued: 04/12/1994
• Est. Priority Date: 06/03/1993
• Status: Expired due to Fees

• Current Assignee: Dow, Inc.
• Original Assignee: Dow, Inc.
• Inventors: Kasprzak, Kenneth A.
• Primary Examiner(s): Page, Thurman K.
• Assistant Examiner(s): VENKAT, JYOTHSNA A
• Application Number:
  US08/071,730
• Time in Patent Office: 313 Days
• Field of Search: 424/401, 424/78.03, 514/844, 514/846, 514/847, 514/937
• US Class Current: 424/78.03
• CPC Class Codes: A61K 8/06 Emulsions
• CPC Class Codes: A61K 8/585 Organosilicon compounds
• 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: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: A61Q 19/10 Washing or bathing preparations

Abstract

A method of making a stable emulsified personal care product by (i) forming an anhydrous silicone mixture which includes a silicone such as a silicone oil or a silicone gum, the mixture further including a first silicone oxyalkylene copolymer, and a second silicone oxyalkylene copolymer; (ii) forming an aqueous based pre-emulsified personal care product; and (iii) adding the anhydrous silicone mixture directly to the pre-emulsified personal care product without further emulsification.

Claims

1. A method of making a stable emulsified personal care product having as an ingredient thereof a silicone skin conditioning agent, comprising (i) forming an anhydrous silicone mixture which includes a silicone selected from the group consisting of volatile cyclopolysiloxanes having the formula in which x has a value of 3 to 10, non-volatile linear polysiloxanes having a viscosity of 5 to 10,000 centistokes, and a silicone gum, the mixture further including a first silicone oxyalkylene copolymer, and a second silicone oxyalkylene copolymer;

(ii) forming a pre-emulsified aqueous based personal care product; and

(iii) adding the anhydrous silicone mixture directly to the pre-emulsified personal care product without further emulsification, the first silicone oxyalkylene copolymer in the anhydrous silicone mixture being a siloxane polyether of the formula;

##STR4## wherein R^a is an alkyl group of one to six carbon atoms;

R^b is the radical --C_m H_2m --;

R^c is a terminating radical selected from the group consisting of hydrogen, an alkyl group of one to six carbon atoms, and an aryl group;

m has a value of two to eight;

p and s each have values between 18 to 28;

x has a value of 80 to 120; and

y has a value of 2 to 10.

2. A method according to claim 1 in which R^a and the terminating radical R^c are methyl groups;

and m is three or four.

3. A method according to claim 1 in which the second silicone oxyalkylene copolymer in the anhydrous silicone mixture is a siloxane polyether of the formula:

##STR5## wherein R^a is an alkyl group of one to six carbon atoms;

R^b is the radical --C_m H_2m --;

R^c is a terminating radical selected from the group consisting of hydrogen, an alkyl group of one to six carbon atoms, or an aryl group;

m has a value of two to eight;

p has a value of 8 to 16;

x has a value of 6 to 12; and

y has a value of 1 to 8.

4. A method according to claim 3 in which the silicone in the anhydrous silicone mixture is the silicone gum of the structure HOMe₂ SiO--(Me₂ SiO)_n SiMe₂ OH in which Me is methyl and n is an integer having a value of from one to 10,000.

5. A method according to claim 4 in which the silicone gum is blended with a non-volatile linear silicone fluid having a viscosity of 5 to 350 centistokes.

6. A method according to claim 3 in which the silicone in the anhydrous silicone mixture is the silicone gum of the structure Me₃ SiO(Me₂ SiO)_n SiMe₃ in which Me is methyl and n is an integer having a value of from one to 10,000.

7. A stable emulsified personal care product prepared according to the method defined in claim 1.

8. A composition comprising an anhydrous silicone mixture which includes (i) a silicone selected from the group consisting of a silicone oil and a silicone gum, the mixture further including (ii) a first silicone oxyalkylene copolymer, and (iii) a second silicone oxyalkylene copolymer;

the silicone (i) in the anhydrous mixture being a compound selected from the group consisting of volatile cyclopolysiloxanes having the formula [(CH₃)₂ SiO]_x in which x has a value of 3 to 10, and non-volatile linear polysiloxanes having a viscosity of 5 to 25,000,000 centistokes;

the first silicone oxyalkylene copolymer (ii) in the anhydrous silicone mixture being a siloxane polyether of the formula;

##STR6## wherein R^a is an alkyl group of one to six carbon atoms;

R^b is the radical --C_m H_2m --;

R^c is a terminating radical selected from the group consisting of hydrogen, an alkyl group of one to six carbon atoms, and an aryl group;

m has a value of two to eight;

p and s each have values between 18 to 28;

x has a value of 80 to 120; and

y has a value of 2 to 10; and

in which the second silicone oxyalkylene copolymer (iii) in the anhydrous silicone mixture is a siloxane polyether of the formula;

##STR7## wherein R^a is an alkyl group of one to six carbon atoms;

R^b is the radical --C_m H_2m --;

R^c is a terminating radical selected from the group consisting of hydrogen, an alkyl group of one to six carbon atoms, or an aryl group;

m has a value of two to eight;

p has a value of 8 to 16;

x has a value of 6 to 12; and

y has a value of 1 to 8.

9. A composition according to claim 8 in which the silicone in the anhydrous silicone mixture is the silicone gum of the structure HOMe₂ SiO-(Me₂ SiO)_n SiMe₂ OH in which Me is methyl and n is an integer having a value of from one to 10,000.

10. A composition according to claim 9 in which the silicone gum is blended with a non-volatile linear silicone fluid having a viscosity of 5 to 350 centistokes.

11. A composition according to claim 8 in which the silicone in the anhydrous silicone mixture is the silicone gum of the structure Me₃ SiO(Me₂ SiO)_n SiMe₃ in which Me is methyl and n is an integer having a value of from one to 10,000.