Patent US4501888A successfully refreshed from Google Patents.
US4501888A
Expired / Lapsed
US
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Process for producing esters of carbohydrate materials
Assignee: Staley Continental Inc
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Filing: 1984-01-24
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Granted: 1985-02-26
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Expires: 2004-01-24
Abstract
Abstract This invention describes a process for acetylating (esterifying) starches including dispersing the starch in an organic acid; contacting the starch with an organic acid anhydride; and reacting the components in the presence of a quaternary ammonium halide.
Inventors
- 👤 James C. Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:44
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/02; C08B31/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
51 words
A process for esterifying a starch including the steps of: (a) dispersing a starch in an organic acid; (b) contacting the starch with an organic acid anhydride; and, (c) reacting the starch and the organic acid anhydride in the presence of a quaternary ammonium halide, thereby obtaining the esterified starch product.
Claim 2
Dependent Claim
51 words
A process for esterifying a starch including the steps of: (a) dispersing a starch in an organic acid; (b) contacting the starch with an organic acid anhydride; and, (c) reacting the starch and the organic acid anhydride in the presence of a quaternary ammonium halide, thereby obtaining the esterified starch product.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the quaternary ammonium halide is selected from the group consisting of chlorides, bromides and iodides and mixtures thereof.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the starch is selected from the group consisting of waxy maize, dent corn, and high amylose starches and mixtures thereof.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein the starch is dent corn starch.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the organic acid is acetic acid.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein the organic acid anhydride is acetic anhydride.
Claim 8
Dependent Claim
10 words
The process of claim 1 conducted under essentially anhydrous conditions.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein the organic acid anhydride is acetic anhydride.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the reaction is conducted at from about 50° C. to about 150° C.
Claim 11
Dependent Claim
56 words
The process of claim 1 wherein the quaternary ammonium halide is of the formula R 1 R 2 R 3 R 4 N[X] wherein R 1 , R 2 , R 3 and R 4 contain at least 12 carbon atoms total with R 1 through R 4 each being from 1 to 20 carbon atoms.
Claim 12
Dependent Claim
21 words
The process of claim 10 wherein R 1 through R 4 contain from about 1 to about 18 carbon atoms each.
Claim 13
Dependent Claim
33 words
The process of claim 1 containing the additional step of introducing water to the mixture of organic acid and the esterified starch thereby effecting separation of the esterified starch from the organic acid.
Claim 14
Dependent Claim
23 words
The process of claim 1 wherein the weight ratio of the organic acid to the starch is from about 10:1 to about 1:2.
Claim 15
Dependent Claim
23 words
The process of claim 1 wherein the starch is esterified to a degree of substitution (D.S.) of from about 1.5 to about 2.9.
Claim 16
Dependent Claim
13 words
The process of claim 1 wherein the quaternary ammonium halide is hexadecyltrimethylammonium bromide.
Claim 17
Dependent Claim
13 words
The process of claim 1 wherein the quaternary ammonium halide is hexadecyltrimethylammonium chloride.
Claim 18
Dependent Claim
10 words
The process of claim 1 wherein the starch is ungelatinized.
References Cited (Backward Citations)
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Cited
US2140346A
Cited
US2412213A
Cited
US2399455A
Cited
SU374327A2
Cited
US4060506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |