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US4874830A Expired / Lapsed US ⏱️ 0.0 years remaining

Acrylic copolymer and skin protective

Assignee: Nissin Chemicals Co Ltd
•
Filing: 1987-10-19
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Granted: 1989-10-17
•
Expires: 2007-10-19
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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 the 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 16:06
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: 5
Claim 1
Independent Claim 45 words
A skin-protective 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, said copolymer containing therein residual monomers in amounts of 50 ppm or less, but substantially no surfactants.
Claim 2
Dependent Claim 45 words
A skin-protective 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, said copolymer containing therein residual monomers in amounts of 50 ppm or less, but substantially no surfactants.
Claim 3
Dependent Claim 25 words
A skin-protective acrylic copolymer according to claim 1 in which the weight-average molecular weight of said acrylic copolymer is between about 100,000 and about 200,000.
Claim 4
Dependent Claim 25 words
A skin-protective acrylic copolymer according to claim 1 in which the weight-average molecular weight of said acrylic copolymer is between about 100,000 and about 1,300,000.
Claim 5
Dependent Claim 17 words
A skin-protective acrylic copolymer according to claim 1, which is in the form of an aqueous emulsion.

References Cited (Backward Citations)

US3501432A Cited
US3677991A Cited
US3865904A Cited
US4120841A Cited
US4125700A Cited
JPS56145907A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-16 1993-04-17 1993-10-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-16 1997-04-17 1997-10-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-16 2001-04-17 2001-10-17 $7700.00 Window Closed / Lapsed

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