US4137399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing functionalized celluloses
Assignee: Dynamit Nobel AG
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Filing: 1977-09-30
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Granted: 1979-01-30
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Expires: 1997-09-30
Abstract
Abstract Production of cellulose derivatives substituted by groups having functional moieties by reaction of a hydroxyl group(s) of the cellulose with an at least bifunctional reagent. The reagent is reacted with cellulose dissolved in dimethylsulfoxide containing polyhydroxymethylene.
Inventors
- 👤 Hans L. Hulsmann
- 👤 Gustav Renckhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:05
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/05; C08B1/00; C08B1/003; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
In the production of cellulose substituted by a group having a functional moiety or moieties capable of forming respectively a bond or bonds, wherein cellulose is contacted with an at least bifunctional reagent for reaction of a hydroxy group of the cellulose with the bifunctional reagent to form said substituted cellulose, the improvement which comprises contacting the reagent with cellulose dissolved in dimethylsulfoxide containing polyhydroxymethylene for said reaction of the cellulose and reagent to form said substituted cellulose.
Claim 2
Dependent Claim
78 words
In the production of cellulose substituted by a group having a functional moiety or moieties capable of forming respectively a bond or bonds, wherein cellulose is contacted with an at least bifunctional reagent for reaction of a hydroxy group of the cellulose with the bifunctional reagent to form said substituted cellulose, the improvement which comprises contacting the reagent with cellulose dissolved in dimethylsulfoxide containing polyhydroxymethylene for said reaction of the cellulose and reagent to form said substituted cellulose.
Claim 3
Dependent Claim
14 words
Process of claim 1, wherein the reagent has at least two different functional groups.
Claim 4
Dependent Claim
11 words
Process of claim 1, the reagent being p-chloromethylbenzoic acid methyl ester.
Claim 5
Dependent Claim
9 words
Process of claim 1, the reagent being p-nitrobenzoyl chloride.
Claim 6
Dependent Claim
8 words
Process of claim 1, the reagent being γ-aminopropyltriethoxysilane.
Claim 7
Dependent Claim
8 words
Process of claim 1, the reagent being γ-mercaptopropyltrimethoxysilane.
Claim 8
Dependent Claim
8 words
Process of claim 1, the reagent being γ-glycidyoxypropyltrimethoxysilane.
Claim 9
Dependent Claim
86 words
Process of claim 1, wherein said group is of the formula ##STR3## wherein: B is said functional moiety; n is 1-4; A is a group of the reagent bonded to the oxygen atom of the hydroxy group of the cellulose; A' is a group capable of reaction with cellulose; and R' is an aliphatic group of 2 to 4 aliphatic carbon atoms or of 1 carbon atom where B is a carboxyl moiety, a group containing a benzene, toluene, or xylene moiety, or an organosilane moiety.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |