US3872060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sulfoalkylating polyhydric alcohols and the corresponding product
Assignee: Continental Group Inc
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Filing: 1973-10-04
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Granted: 1975-03-18
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Expires: 1993-10-04
Abstract
Abstract The present invention relates to a method for forming a sulfoalkylated ester of a polyhydric alcohol and the corresponding product. The process comprises reacting a polyhydric alcohol with a sulfur trioxide-organophosphorus complex which contains from about 0.1-0.8 moles of sulfur trioxide per mole of organophosphorus compound. The sulfur trioxide-organophosphorus complex is used in a proportion sufficient to provide at least about 50 mole percent sulfur trioxide in excess of that stoichiometrically required to form the desired ester.
Inventors
- 👤 Noel I Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:26
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/335; C08G65/3358; C07; C07C; C07C305/00; C07C305/02; C07C305/04; C07C305/10; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/28; C07F9/38; C07F9/40; C08B; C08B31/00; C08B31/02; C08B31/06; C08B31/063; C08B33/00; C08B33/02; C08B37/00; C08B37/006; C08B37/0084; C08B5/00; C08B5/14; C08F; C08F8/00; C08F8/34; C08G65/321; C08G65/326
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
22 words
A PROCESS FOR SULFOALKYLATING A POLYHYDRIC ALCOHOL WHICH COMPRISES REACTING SAID POLYHYDRIC ALCOHOL WITH A SULFUR TRIOXIDE-ORGANOPHOSPHORUS COMPLEX REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
22 words
A PROCESS FOR SULFOALKYLATING A POLYHYDRIC ALCOHOL WHICH COMPRISES REACTING SAID POLYHYDRIC ALCOHOL WITH A SULFUR TRIOXIDE-ORGANOPHOSPHORUS COMPLEX REPRESENTED BY THE FORMULA:
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein said organophosphorus compound is a trialkyl phosphorus ester compound having from 1-18 carbon atoms in the alkyl portion.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein said alkyl portion has from 1-6 carbon atoms.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said polyhydric alcohol is a polymeric polyhydric alcohol.
Claim 6
Dependent Claim
29 words
The process of claim 4 wherein said conditions for reacting said polyhydric alcohol and said complex is from about - 20* to about 100*C. and the pressure is atmospheric.
Claim 7
Dependent Claim
21 words
The process of claim 5 wherein said complex contains from about 0.25-0.5 moles sulfur trioxide per mole of trialkyl phosphorus compound.
Claim 8
Dependent Claim
13 words
The process of claim 5 wherein said trialkyl phosphorus compound is trialkyl phosphate.
Claim 9
Dependent Claim
28 words
The process of claim 7 wherein said sulfur trioxide is present in a proportion of from about 100-300% in excess of that required to form said sulfoalkylated ester.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein said polymeric polyhydric alcohol is a polysaccharide.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein said polysaccharide is cellulose, starch, Or amylose.
Claim 12
Dependent Claim
10 words
The process of claim 10 wherein said polysaccharide is cellulose.
Claim 13
Dependent Claim
19 words
The process of claim 11 wherein said sulfoalkylated cellulose ester has a degree of substitution of at least 2.
Claim 14
Dependent Claim
13 words
The process of claim 4 wherein said polymeric polyhydric alcohol is polyvinyl alcohol.
Claim 15
Dependent Claim
48 words
A sulfoalkylated polymeric polyhydric alcohol of the formula: Pol -(O - SO2-OR)n wherein Pol represents a polyhydric alcohol radical, and R represents an alkyl or cycloaliphatic group having up to 18 carbon atoms and n is a number up to the number of hydroxy groups available for esterification.
Claim 16
Dependent Claim
48 words
A sulfoalkylated polymeric polyhydric alcohol of the formula: Pol -(O - SO2-OR)n wherein Pol represents a polyhydric alcohol radical, and R represents an alkyl or cycloaliphatic group having up to 18 carbon atoms and n is a number up to the number of hydroxy groups available for esterification.
Claim 17
Dependent Claim
13 words
The compound of claim 14 wherein said polymeric alcohol portion is a polysaccharide.
Claim 18
Dependent Claim
10 words
The compound of claim 15 wherein said polysaccharide is cellulose.
Claim 19
Dependent Claim
18 words
The compound of claim 16 wherein said sulfoalkylated cellulose has a degree of substitution of at least 2.
Claim 20
Dependent Claim
10 words
The sulfoalkylated cellulose of claim 17 which has been hydrolyzed.
Claim 21
Dependent Claim
11 words
An alkali metal sulfate salt of the compound of claim 18.
Claim 22
Dependent Claim
13 words
A compound as defined in claim 19 wherein said alkali metal is sodium.
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |