US4835266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cosmetic compositions based upon n-hydroxypropyl-chitosans, new n-hydroxypropyl-chitosans, as well as processes for the production thereof
Assignee: Procter and Gamble Deutschland GmbH
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Filing: 1988-04-22
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Granted: 1989-05-30
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Expires: 2008-04-22
Abstract
Abstract Cosmetic compositions are disclosed, for the treatment of skin or hair, with a content of new N-hydroxypropyl-chitosan derivatives, composed of (a) 4 to 40 Mol-% units of Formula (I) <IMAGE> (I) and (b) 60 to 96 Mol-% units of Formula (II) <IMAGE> (II) wherein R1 and R2 are the same or different and are each hydrogen or the group <IMAGE> with n being equal to an integer from 1 to 5, with the proviso that in at least 50% of the units (II), R1 and R2 are not simultaneously hydrogen, or the salts thereof; along with new N-hydroxypropyl-chitosan derivatives and their salts as well a a process for the production of these new compounds from propylene oxide and chitosan.
Inventors
- 👤 Gunther Lang
- 👤 Gerhard Maresch
- 👤 Harald Wendel
- 👤 Eugen Konrad
- 👤 Hans-Rudi Lenz
- 👤 Jurgen Titze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:45
CPC Classifications
A; A61; A61Q; A61Q5/00; A61Q5/02; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/73; A61K8/736; A61Q19/00; A61Q5/06; A61Q5/065; A61Q5/12; C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0027; C08B37/003; A61Q5/04; A61Q5/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
Process for the production of macromolecular, N-hydroxypropyl compounds derived from chitosan, composed of (a) 4 to 40 Mol-% units of the Formula (I) ##STR10## and (b) 60 to 96 Mol-% units of the Formula (II) ##STR11## wherein R 1 and R 2 are the same or different and are each hydrogen or the group ##STR12## with n being equal to an integer from 1 to 5, with the proviso that in at least 50% of the units of Formula (II), R 1 and R 2 are not simultaneously hydrogen, and the soluble salts thereof with organic or inorganic acids, comprising reacting a chitosan composed of chitin deacetylated to an extent of 60 to 96%, or a salt thereof, with propylene oxide, in a ratio of 1:3 to 1:15 molar.
Claim 2
Dependent Claim
129 words
Process for the production of macromolecular, N-hydroxypropyl compounds derived from chitosan, composed of (a) 4 to 40 Mol-% units of the Formula (I) ##STR10## and (b) 60 to 96 Mol-% units of the Formula (II) ##STR11## wherein R 1 and R 2 are the same or different and are each hydrogen or the group ##STR12## with n being equal to an integer from 1 to 5, with the proviso that in at least 50% of the units of Formula (II), R 1 and R 2 are not simultaneously hydrogen, and the soluble salts thereof with organic or inorganic acids, comprising reacting a chitosan composed of chitin deacetylated to an extent of 60 to 96%, or a salt thereof, with propylene oxide, in a ratio of 1:3 to 1:15 molar.
Claim 3
Dependent Claim
22 words
The process according to claim 1, wherein said chitosan is reacted with said propylene oxide at temperatures between 20° and 120° C.
Claim 4
Dependent Claim
23 words
The process according to claim 1, wherein said chitosan is reacted with said propylene oxide over a period of 3 to 72 hours.
Claim 5
Dependent Claim
27 words
The process according to claim 1, wherein said chitosan is reacted in the presence of hydrochloric acid in a dispersion composed of excess propylene oxide and water.
Claim 6
Dependent Claim
30 words
The process according to claim 1, wherein said chitosan is reacted with said propylene oxide in a mixture of water and ethanol in a neutral medium of about pH32 7.
References Cited (Backward Citations)
US3953608A
Cited
JPS57180602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |