US4914140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic copolymer and skin protective
Assignee: Nissin Chemicals Co Ltd
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Filing: 1989-05-18
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Granted: 1990-04-03
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Expires: 2009-05-18
Abstract
Abstract An acrylic copolymer of ethyl acrylate and methacrylic acid wherein the weight ratio of ethyl acrylate to methacrylic acid is in a range between 75:25 and 95:5, containing therein a residual monomer content of 50 ppm or less, but substantially no surfactants, and which is useful as agents for protecting the skin and manufactured from the following essential components: a. an acrylic copolymer of ethyl acrylate and methacrylic acid wherein the weight ratio of ethyl acrylate to methacrylic acid is in a range between 75:25 and 95:5, containing therein residual monomers in an amount of 50 ppm or less, but substantially no surfactants--approximately 2 to 10%; b. cellulose derivative--approximately 0.2 to 2%; and c. a necessary amount of an aqueous alcohol to make the whole 100%.
Inventors
- 👤 Izumi Saitoh
- 👤 Shigeru Kido
- 👤 Yoshio Sasaki
- 👤 Syuichiro Shinohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:56
CPC Classifications
A; A61; A61Q; A61Q17/00; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8141; A61K8/8152; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F220/1802; Y; Y10; Y10S; Y10S526/00; Y10S526/936
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
56 words
A skin-protective composition consisting essentially of an effective skin-protective amount of an acrylic copolymer of ethyl acrylate and methacrylate acid in which the ratio of ethyl acrylate to methacrylic acid is within a range of 75:25 and 95:5 and which contains residual monomers of 50 ppm or less, but substantially no surfactants and an alcoholic solvent.
Claim 2
Dependent Claim
56 words
A skin-protective composition consisting essentially of an effective skin-protective amount of an acrylic copolymer of ethyl acrylate and methacrylate acid in which the ratio of ethyl acrylate to methacrylic acid is within a range of 75:25 and 95:5 and which contains residual monomers of 50 ppm or less, but substantially no surfactants and an alcoholic solvent.
Claim 3
Dependent Claim
19 words
A skin-protective agent according to claim 1 in which the alcoholic solvent is a mixture of water and alcohol.
Claim 4
Dependent Claim
24 words
A skin protective agent according to claim 2 in which the alcoholic solvent contains water and alcohol in an alcohol/water ratio of from 60:40.
Claim 5
Dependent Claim
20 words
A composition according to claim 3 in which the alcohol is selected from the group consisting of ethanol and isopropanol.
Claim 6
Dependent Claim
23 words
A skin-protective composition according to claim 4 in which the acrylic polymer is present in an amount of from about 2 to 10%.
Claim 7
Dependent Claim
13 words
A skin-protective composition according to claim 1 which also contains a cellulose derivative.
Claim 8
Dependent Claim
24 words
A skin-protective composition according to claim 6 in which the cellulose derivative is selected from the group consisting of methylcellulose, ethylcellulose and hydroxypropyl cellulose.
Claim 9
Dependent Claim
21 words
A skin-protective composition according to claim 7 in which the cellulose derivative is present in an amount of 0.3 to 2.0%.
Claim 10
Dependent Claim
27 words
A skin-protective composition according to claim 8 which also contains conventional additive for the skin selected from the group consisting of softening agents, conservatives and colony agents.
Claim 11
Dependent Claim
74 words
A skin-protective composition consisting essentially of the following components: a. an acrylic copolymer of ethyl acrylate and methacrylic acid wherein the weight ratio of ethyl acrylate to methacrylic acid in a range between 75:25 and 95:5, said copolymer containing therein residual monomer(s) at 50 ppm or less, but substantially no surfactants--approximately 2 to 10%; b. a cellulose derivative--approximately 0.2 to 2%; and c. a necessary amount of aqueous alcohol to make the whole 100%.
Claim 12
Dependent Claim
74 words
A skin-protective composition consisting essentially of the following components: a. an acrylic copolymer of ethyl acrylate and methacrylic acid wherein the weight ratio of ethyl acrylate to methacrylic acid in a range between 75:25 and 95:5, said copolymer containing therein residual monomer(s) at 50 ppm or less, but substantially no surfactants--approximately 2 to 10%; b. a cellulose derivative--approximately 0.2 to 2%; and c. a necessary amount of aqueous alcohol to make the whole 100%.
Claim 13
Dependent Claim
24 words
A skin-protective composition according to claim 10 in which the weight-average molecular weight of the acrylic copolymer is between about 100,000 and about 2,000,000.
Claim 14
Dependent Claim
24 words
A skin-protective composition according to claim 10 in which the weight-average molecular weight of the acrylic copolymer is between about 100,000 and about 1,300,000.
Claim 15
Dependent Claim
24 words
A skin-protective composition according to claim 10 in which the cellulose derivative is selected from the group consisting of methylcellulose, ethylcellulose and hydroxypropyl cellulose.
Claim 16
Dependent Claim
21 words
A skin-protective agent according to claim 13 in which the alcohol present in the aqueous alcohol mixture is ethanol or isopropanol.
Claim 17
Dependent Claim
17 words
A skin-protective agent according to claim 14 in which the mixing ratio of the alcohol/water is 60/40.
Claim 18
Dependent Claim
34 words
A method of forming a skin-protective coating on the skin which comprises applying to the skin, in sufficient amounts to form on a coating on the skin, a skin-protective composition according to claim 1.
Claim 19
Dependent Claim
34 words
A method of forming a skin-protective coating on the skin which comprises applying to the skin, in sufficient amounts to form on a coating on the skin, a skin-protective composition according to claim 10.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |