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US4734286A
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Crosslinked poly β-alanine and compositions containing the same
Assignee: L'Oréal SA
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Filing: 1986-05-16
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Granted: 1988-03-29
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Expires: 2006-05-16
Abstract
Abstract A water insoluble crosslinked poly beta -alanine is prepared by crosslinking poly beta -alanine with a crosslinking agent selected from the group consisting of formaldehyde and a dialdehyde or by irradiation of said poly beta -alanine with Co60.
Inventors
- 👤 Claude Mahieu
- 👤 Christos Papantoniou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:04
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/84; A61K8/88; A61K47/00; A61K47/30; A61K47/34; A61K8/02; A61K8/0241; A61K8/025; A61K9/00; A61K9/14; A61K9/16; A61K9/1605; A61K9/1629; A61K9/1641; A61K9/70; A61K9/7007; A61L; A61L27/00; A61L27/14; A61L27/18; A61Q; A61Q19/00; C; C08; C08G; C08G69/00; C08G69/46; C08G69/48; C08G69/50; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; A61K2800/00; A61K2800/40; A61K2800/60; A61K2800/65; A61K2800/654; A61Q17/00; A61Q17/005; A61Q17/04; A61Q19/06; A61Q3/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
A cosmetic or pharmaceutical composition comprising a water-insoluble crosslinked poly β-alanine in the form of spheres having a diameter ranging from 2 to 500 microns and being prepared by crosslinking poly β-alanine having the formula ##STR3## wherein R represents hydrogen or a branching of the formula, ##STR4## the percentage of terminal primary amide units (b) being between 5 and 35 percent relative to the total amide units of the polymer, said crosslinking being carried out with a crosslinking agent selected from the group consisting of glutaraldehyde and formaldehyde in an aqueous solution of said poly β-alanine at an acid pH.
Claim 2
Dependent Claim
100 words
A cosmetic or pharmaceutical composition comprising a water-insoluble crosslinked poly β-alanine in the form of spheres having a diameter ranging from 2 to 500 microns and being prepared by crosslinking poly β-alanine having the formula ##STR3## wherein R represents hydrogen or a branching of the formula, ##STR4## the percentage of terminal primary amide units (b) being between 5 and 35 percent relative to the total amide units of the polymer, said crosslinking being carried out with a crosslinking agent selected from the group consisting of glutaraldehyde and formaldehyde in an aqueous solution of said poly β-alanine at an acid pH.
Claim 3
Dependent Claim
21 words
The composition of claim 1 wherein said crosslinked poly β-alanine is an absorption agent for facilitating the natural process of cicatrization.
Claim 4
Dependent Claim
23 words
The composition of claim 1 wherein said crosslinked poly β-alanine is a support capable of being impregnated with a water soluble active substance.
Claim 5
Dependent Claim
21 words
The composition of claim 1 wherein said crosslinked poly β-alanine is an excipient for active substances, in dispersion or in solution.
References Cited (Backward Citations)
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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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |