US4119487A
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Starch ether derivatives, a method for the preparation thereof and their use in paper
Assignee: Ingredion Inc
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Filing: 1977-09-06
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Granted: 1978-10-10
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Expires: 1997-09-06
Abstract
Abstract Novel starch ether derivatives are prepared by reacting starch with 3-chloro-2-sulfopropionic acid. The resulting 2-sulfo-2-carboxyethyl starch ether derivatives find use in many applications, but are particularly useful as pigment retention aids in papermaking processes.
Inventors
- 👤 Martin M. Tessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:17
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; C; C08; C08B; C08B31/00; C08B31/08; C08B31/12
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
32 words
As a composition of matter, a starch ether derivative of the general structure: ##STR4## wherein St-O- represents a starch molecule, M is a cation, and n is the valence number of M.
Claim 2
Dependent Claim
32 words
As a composition of matter, a starch ether derivative of the general structure: ##STR4## wherein St-O- represents a starch molecule, M is a cation, and n is the valence number of M.
Claim 3
Dependent Claim
15 words
The starch derivative of claim 1 wherein M is an alkali or alkaline earth metal.
Claim 4
Dependent Claim
16 words
The starch derivative of claim 1 wherein the starch molecule contains cationogenic or cationic nitrogen-containing groups.
Claim 5
Dependent Claim
21 words
The starch derivative of claim 3 wherein the starch molecule contains either diethyl aminoethyl ether groups or 3-(trimethylammonium chloride)-2-hydroxypropyl ether groups.
Claim 6
Independent Claim
62 words
A method for preparing a starch ether derivative of the general structure: ##STR5## wherein St-O- represents a starch molecule, M is a cation, and n is the valence number of M, which comprises the steps of: a. reacting a starch base with about 0.5-100% by weight of neutralized 3-chloro-2-sulfopropionic acid reagent, based on dry starch; and b. isolating the resultant starch derivative.
Claim 7
Independent Claim
62 words
A method for preparing a starch ether derivative of the general structure: ##STR5## wherein St-O- represents a starch molecule, M is a cation, and n is the valence number of M, which comprises the steps of: a. reacting a starch base with about 0.5-100% by weight of neutralized 3-chloro-2-sulfopropionic acid reagent, based on dry starch; and b. isolating the resultant starch derivative.
Claim 8
Dependent Claim
29 words
The method of claim 5 wherein said reaction is carried out in aqueous medium at a pH of 9.5-13.0 and at a temperature of 20°-90° C. for 0.5-24 hours.
Claim 9
Dependent Claim
26 words
The method of claim 6 wherein said reaction is carried out at a pH of 11-12 and at a temperature of 20°-30° C. for 1-6 hours.
Claim 10
Dependent Claim
31 words
The method of claim 6 wherein M is an alkali metal and said reaction is carried out in the presence of 15-50% by weight of sodium sulfate, based on dry starch.
Claim 11
Dependent Claim
24 words
The method of claim 5 wherein said reaction is carried out in a non-aqueous medium at a temperature of 40°-150° C. for 1-20 hours.
Claim 12
Dependent Claim
27 words
The method of claim 9 wherein said reaction is carried out in an organic solvent selected from the group consisting of alcohols, aromatic hydrocarbons and aliphatic hydrocarbons.
Claim 13
Dependent Claim
26 words
The method of claim 5 wherein said reaction is carried out in a substantially dry reaction medium at a temperature of 30°-150° C. for 0.5-10 hours.
Claim 14
Dependent Claim
18 words
The method of claim 5 wherein said 3-chloro-2-sulfopropionic acid reagent is neutralized prior to mixing with said starch.
Claim 15
Dependent Claim
20 words
The method of claim 5 wherein said 3-chloro-2-sulfopropionic acid reagent is neutralized in situ in the presence of said starch.
Claim 16
Dependent Claim
34 words
The method of claim 5 wherein said starch base is reacted with about 1-15% by weight of said neutralized 3-chloro-2-sulfopropionic acid reagent, based on dry starch, and the resultant starch ether derivative is granular.
Claim 17
Dependent Claim
15 words
The method of claim 5 wherein the starch molecule contains cationogenic or cationic nitrogen-containing groups.
Claim 18
Dependent Claim
20 words
The method of claim 15 wherein the starch molecule contains either diethyl aminoethyl ether groups or 3-(trimethylammonium chloride)-2-hydroxypropyl ether groups.
Claim 19
Dependent Claim
66 words
The method of claim 15 wherein the starch base is reacted with 2-6% by weight of the neutralized 3-chloro-2-sulfopropionic acid reagent and 0.5-2.5% by weight of cationic reagent, based on dry starch, the ratio of anionic to cationic reagent being about 2:1 to 4:1 by weight, wherein said cationic reagent provides said cationogenic or cationic nitrogen-containing groups and wherein the resultant starch ether derivative is granular.
Claim 20
Dependent Claim
14 words
The method of claim 5 wherein M is an alkali or alkaline earth metal.
Claim 21
Dependent Claim
76 words
A paper containing pigment and alum and having dispersed therein as a pigment retention aid a starch ether derivative of the general structure: ##STR6## wherein St-O- represents a starch molecule, M is a cation, and n is the valence number of M, wherein said paper is prepared from a papermaking stock containing more than 4% alum by weight of dry pulp and from about 0.05 to 2.0% of said starch derivative by weight of dry pulp.
Claim 22
Dependent Claim
76 words
A paper containing pigment and alum and having dispersed therein as a pigment retention aid a starch ether derivative of the general structure: ##STR6## wherein St-O- represents a starch molecule, M is a cation, and n is the valence number of M, wherein said paper is prepared from a papermaking stock containing more than 4% alum by weight of dry pulp and from about 0.05 to 2.0% of said starch derivative by weight of dry pulp.
Claim 23
Dependent Claim
20 words
The paper of claim 19 wherein the starch molecule of said starch ether derivative contains cationogenic or cationic nitrogen-containing groups.
Claim 24
Dependent Claim
19 words
The paper of claim 19 wherein M of said starch ether derivative is an alkali or alkaline earth metal.
Claim 25
Dependent Claim
90 words
In a method for making paper containing pigment and alum, the step which comprises adding, as a pigment retention aid, to the stock containing more than 4% alum by weight of dry pulp, at any stage prior to forming a web, a starch ether derivative of the general structure: ##STR7## wherein St-O- represents a starch molecule, M is a cation, and n is the valence number of M, said starch derivative being added to the stock in an amount of from about 0.05 to 2.0% by weight of dry pulp.
Claim 26
Dependent Claim
90 words
In a method for making paper containing pigment and alum, the step which comprises adding, as a pigment retention aid, to the stock containing more than 4% alum by weight of dry pulp, at any stage prior to forming a web, a starch ether derivative of the general structure: ##STR7## wherein St-O- represents a starch molecule, M is a cation, and n is the valence number of M, said starch derivative being added to the stock in an amount of from about 0.05 to 2.0% by weight of dry pulp.
Claim 27
Dependent Claim
20 words
The method of claim 22 wherein the starch molecule of said starch ether derivative contains cationogenic or cationic nitrogen-containing groups.
Claim 28
Dependent Claim
19 words
The method of claim 22 wherein M of said starch ether derivative is an alkali or alkaline earth metal.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |