US4332935A
Expired / Lapsed
US
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Process for the production of cationic starch ethers
Assignee: Evonik Operations GmbH
•
Filing: 1980-12-08
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Granted: 1982-06-01
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Expires: 2000-12-08
Abstract
Abstract The known process for the production of cationic starch ethers by the reaction of starch with cationic etherifying agents in the presence of water in an alkaline medium is improved by reacting the starch at a temperature of about 50° to 120° C. with an alkylidene epoxide which has a tertiary amino group or quaternary ammonium group in a medium which contains about 10 to 35 weight percent water and about 0.2 to 2.0 weight percent calcium hydroxide or calcium oxide. There are produced in short reaction times yields not previously attainable.
Inventors
- 👤 Wolfgang Fischer
- 👤 Manfred Langer
- 👤 Gerhard Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:33
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12; C08B31/125
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
64 words
A process for the production of a cationic starch ether comprising reacting starch with an alkylidene epoxide having a tertiary amino group or a quaternary ammonium group in aqueous alkaline medium at a temperature of 50° to 120° C. and wherein the medium contains about 10 to 35 weight percent of water and about 0.2 to 2.0 weight percent calcium hydroxide or calcium oxide.
Claim 2
Dependent Claim
64 words
A process for the production of a cationic starch ether comprising reacting starch with an alkylidene epoxide having a tertiary amino group or a quaternary ammonium group in aqueous alkaline medium at a temperature of 50° to 120° C. and wherein the medium contains about 10 to 35 weight percent of water and about 0.2 to 2.0 weight percent calcium hydroxide or calcium oxide.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the alkylidene epoxide has a quaternary ammonium group.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein the quaternary ammonium group is the glycidyl trimethylammonium group.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein the alkylidene epoxide is glycidyl trimethylammonium chloride.
Claim 6
Dependent Claim
21 words
The process of claim 4 wherein there is employed 0.005 to 0.5 mole of epoxide per anhydroglucose unit of the starch.
Claim 7
Dependent Claim
51 words
The process of claim 5 wherein there is employed 0.01 to 0.3 mole of epoxide per anhydroglucose unit of the starch, there is employed 15 to 25 weight percent of water and 0.4 to 1.5 weight percent of calcium hydroxide or calcium oxide and the temperature is 50° to 90° C.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein the starch is potato starch, corn starch or wheat starch.
Claim 9
Dependent Claim
21 words
The process of claim 1 wherein there is employed 0.005 to 0.5 mole of epoxide per anhydroglucose unit of the starch.
Claim 10
Dependent Claim
50 words
The process of claim 8 wherein there is employed 0.01 to 0.3 mole of epoxide per anhydroglucose unit of starch, there is employed 15 to 25 weight percent of water and 0.4 to 1.5 weight percent of calcium hydroxide or calcium oxide and the temperature is 50° to 90° C.
Claim 11
Dependent Claim
58 words
The process of claim 1 wherein the alkylidene epoxide has the formula ##STR3## where n is a number from 1 to 3, R 1 , R 2 and R 3 are alkyl groups of 1 to 4 carbon atoms where R 1 and R 2 can be joined to form a cycloalkylene ring, and X is an anion.
Claim 12
Dependent Claim
9 words
The process of claim 10 where n is 1.
Claim 13
Dependent Claim
12 words
The process of claim 11 where the alkylidene epoxide has formula II.
Claim 14
Dependent Claim
11 words
The process of claim 11 where X is the chloride anion.
Claim 15
Dependent Claim
12 words
The process of claim 10 where the alkylidene epoxide has formula II.
Claim 16
Dependent Claim
16 words
A process according to claim 1 wherein the reaction time is 30 minutes to 90 minutes.
Claim 17
Dependent Claim
25 words
A process according to claim 15 wherein the reaction is continued at least until the yield is at least 82% based on the epoxide employed.
Claim 18
Dependent Claim
13 words
A process according to claim 16 wherein there is employed glycidyl trimethylammonium chloride.
Claim 19
Dependent Claim
22 words
A process according to claim 17 wherein there is employed 0.01 to 0.3 mole of epoxide per anhydroglucose unit of the starch.
Claim 20
Dependent Claim
17 words
A process according to claim 18 wherein there is employed 15 to 25 weight percent of water.
Claim 21
Dependent Claim
13 words
A process according to claim 19 wherein the yield is 82 to 93%.
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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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |