Patent US4127563A successfully refreshed from Google Patents.
US4127563A
Expired / Lapsed
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Low pH preparation of cationic starches and flours
Assignee: United States Department of Agriculture
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Filing: 1977-06-29
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Granted: 1978-11-28
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Expires: 1997-06-29
Abstract
Abstract A novel process is disclosed for preparing cationic starches and flours by reacting starch-containing materials in a dry state with a halohydrin at a pH of 9 or below without the necessity for subsequent alkali neutralization or washing. The resultant products have cationic properties remarkably superior to prior art cationic starches over a broad range of acid and alkaline pH's. In the manufacture of paper, they serve as excellent pigment retention and dry-strength improvement agents.
Inventors
- 👤 John C. Rankin
- 👤 Bliss S. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:53
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12; C08B31/125; D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/29
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A method for preparing cationic starchy materials without forming the epoxide outside the reaction mixture comprising reacting a starch-containing material (SCM) with an etherifying reagent having the structural formula ##STR5## wherein: A is ##STR6## R 1 and R 2 are independently selected from the group of C 1 -C 4 straight or branched alkyl radicals or they are joined to form a cyclic structure, and R 3 is hydrogen or a C 1 -C 4 straight or branched alkyl radical, with the proviso that the total number of carbon atoms in R 1 , R 2 , and R 3 does not exceed 8; X 1 and X 2 are halogen atoms; and n is 1-3, wherein said SCM and said etherifying reagent are reacted in a dry state at a pH in the range of 5-9.
Claim 2
Independent Claim
137 words
A method for preparing cationic starchy materials without forming the epoxide outside the reaction mixture comprising reacting a starch-containing material (SCM) with an etherifying reagent having the structural formula ##STR5## wherein: A is ##STR6## R 1 and R 2 are independently selected from the group of C 1 -C 4 straight or branched alkyl radicals or they are joined to form a cyclic structure, and R 3 is hydrogen or a C 1 -C 4 straight or branched alkyl radical, with the proviso that the total number of carbon atoms in R 1 , R 2 , and R 3 does not exceed 8; X 1 and X 2 are halogen atoms; and n is 1-3, wherein said SCM and said etherifying reagent are reacted in a dry state at a pH in the range of 5-9.
Claim 3
Dependent Claim
30 words
The method as described in claim 1 wherein said SCM is selected from the group consisting of cereal grain starches, cereal grain flours, root crop starches, and root crop flours.
Claim 4
Dependent Claim
45 words
The method as described in claim 1 wherein for said etherifying reagent A is selected from the group consisting of N.sup.⊕ (CH 3 ) 3 X 2 ⊖ and N.sup.⊕ (CH 2 CH 3 ) 3 X 2 ⊖, and n is equal to 1.
Claim 5
Dependent Claim
21 words
The method as described in claim 3 wherein for said etherifying reagent X 1 and X 2 are both chlorine atoms.
Claim 6
Dependent Claim
15 words
The method as described in claim 4 wherein said etherifying reagent is 3-chloro-2-hydroxypropyltrimethylammonium chloride, ##STR7##
Claim 7
Dependent Claim
30 words
The method as described in claim 1 wherein the amount of said reagent is such that it provides less than 0.9% nitrogen based upon the dry weight of said SCM.
Claim 8
Dependent Claim
28 words
The method as described in claim 1 wherein the amount of said reagent is such that it provides 0.3-0.8% nitrogen based upon the dry weight of said SCM.
Claim 9
Dependent Claim
38 words
The method as described in claim 1 wherein said SCM and said etherifying reagent are reacted at a temperature within the range of about 25°-100° C. for an inversely related time period of 1 week to 2 hours.
Claim 10
Dependent Claim
36 words
The method as described in claim 1 wherein said SCM and said etherifying reagent are reacted at a temperature within the range of 25°-60° C. for an inversely related time period of 6 to 2 hours.
Claim 11
Dependent Claim
26 words
The method as described in claim 1 wherein said SCM and said etherifying reagent are subjected to a mixing action throughout the time they are reacted.
Claim 12
Dependent Claim
11 words
The cationic starchy materials produced by the process of claim 1.
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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) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |