# US 5,346,977 A · Method of applying a skin-protective composition

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- Number: US 5,346,977 A
- Document ID: US5346977A
- Status: Granted
- Kind: A
- Application number: 08/052,293
- Filed: 1993-04-26
- Granted: 1994-09-13
- Earliest claimed: 1989-04-01
- Assignees: Shionogi & Co., Ltd.; Nissin Chemical Industry Co., Ltd.
- Inventors: Yoshio Sakai; Izumi Saitoh
- Web page: https://patentgrep.com/patent/US5346977A

## CPC

- A61K 8/8152: {Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers}
- A61Q 17/00: Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
- A61K 2800/75: Anti-irritant
- 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

## Abstract

A method of applying a skin-protective composition which comprises an acrylic copolymer which comprises (A) 40 to 85% by weight of an alkyl acrylate, (B) 5 to 50% by weight of an alkyl methacrylate, and (C) 10 to 30% by weight of a mono-ethylenically unsaturated monomer having a carboxyl group, and a medium, which can effectively block irritative materials and be easily removed from a skin.

## Claims

### Claim 1

A method of protecting the skin, which comprises applying to the skin a skin-protective amount of a composition which consists essentially of an acrylic copolymer consisting of
(A) 40 to 85% by weight of an alkyl acrylate,
(B) 5 to 50% by weight of an alkyl methacrylate, and
(C) 10 to 30% by weight of a mono-ethylenically unsaturated monomer having a carboxyl group, and a medium.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the alkyl acrylate (A) is selected from the group consisting of ethylacrylate, propyl acrylate and butyl acrylate.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the alkyl methacrylate (B) is selected from the group consisting of methyl methacrylate and ethyl methacrylate.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the mono-ethylenically unsaturated monomer (C) is selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, half-esters of maleic acid and half-esters of fumaric acid.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the acrylic copolymer has a glass transition temperature of -10.degree. C. to +50.degree. C.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the acrylic copolymer has a weight average molecular weight of 30,000 to 1,500,000.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the medium is selected from the group consisting of ethanol, isopropanol, a mixture of water and ethanol and a mixture of water and isopropanol.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the composition is a solution of the copolymer and the medium.

### Claim 9 (depends on 8)

The method according to claim 8, wherein a concentration of the copolymer in the medium is from 1 to 30% by weight.