# US 5,705,562 A · Spontaneously formed clear silicone microemulsions

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- Number: US 5,705,562 A
- Document ID: US5705562A
- Status: Granted
- Kind: A
- Application number: 08/560,561
- Filed: 1995-11-20
- Granted: 1998-01-06
- Earliest claimed: 1995-11-20
- Assignees: Dow Corning Corporation
- Inventors: Randal Myron Hill
- Web page: https://patentgrep.com/patent/US5705562A

## CPC

- A61K 8/894: modified by a polyoxyalkylene group, e.g. cetyl dimethicone copolyol
- A61K 8/068: {Microemulsions}
- A61K 8/585: {Organosilicon compounds}
- A61Q 5/00: Preparations for care of the hair
- A61Q 15/00: Anti-perspirants or body deodorants (deodorisation of air A61L9/00)
- A61Q 19/00: Preparations for care of the skin
- B82Y 5/00: Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
- C08J 3/03: in aqueous media
- A61K 2800/262: Transparent; Translucent
- A61K 2800/413: Nanosized, i.e. having sizes below 100 nm
- A61Q 5/12: Preparations containing hair conditioners
- C08J 2383/04: Polysiloxanes
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

A method of spontaneously forming a highly stable clear microemulsion by combining (i) water; (ii) a volatile cyclic methyl siloxane or volatile linear methyl siloxane; and (iii) a silicone polyether surfactant. The amounts of each component are such that the composition is in the form of a microemulsion. The volatile methyl siloxane is present in the microemulsion in the form of particles having an average diameter of less than about 100 nanometers. The microemulsion is useful in personal care products.

## Claims

### Claim 1

A method comprising spontaneously forming a microemulsion without mixing, stirring, shearing, or input of mechanical energy for agitating ingredients used to make a microemulsion, by simply combining (i) water; (ii) a cyclic methyl siloxane having the formula {(CH.sub.3).sub.2 SiO}.sub.p or a linear methyl siloxane having the formula (CH.sub.3).sub.3 SiO{(CH.sub.3).sub.2 SiO}.sub.q Si(CH.sub.3).sub.3 in which p is 3-6 and q is 0-5; and (iii) a silicone polyether having a formula selected from the group consisting of ##STR8## where R1 represents an alkyl group containing 1-6 carbon atoms; R2 represents the radical --(CH.sub.2).sub.a O(C.sub.2 H.sub.4 O).sub.b (C.sub.3 H.sub.6 O).sub.c R3; x has a value of 0-3; y has a value of 1-3; z has a value of 0-2; m has a value of 3-5; n is one; a has a value of 3-6; b has a value of 4-20; c has a value of 0-5; and R3 is hydrogen, a methyl radical, or an acyl radical.

### Claim 2 (depends on 1)

A method according to claim 1 in which the methyl siloxane is present in the microemulsion in the form of droplets having an average diameter of less than 100 nanometers.

### Claim 3 (depends on 1)

A method according to claim 1 in which the methyl siloxane is octamethylcyclotetrasiloxane.

### Claim 4 (depends on 1)

A method according to claim 1 in which the methyl siloxane is decamethylcyclopentasiloxane.

### Claim 5 (depends on 1)

A microemulsion prepared according to the method defined in claim 1.

### Claim 6 (depends on 3)

A microemulsion prepared according to the method defined in claim 3, the microemulsion having a composition defined by and within the shaded area depicted in the annexed sole FIGURE 1.