US4097427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationization of starch utilizing alkali metal hydroxide, cationic water-soluble polymer and oxidant for improved wet end strength
Assignee: ChampionX LLC
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Filing: 1977-02-14
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Granted: 1978-06-27
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Expires: 1997-02-14
Abstract
Abstract An improved method for cationizing starch which comprises reacting an aqueous slurry of starch under alkaline conditions with a water-soluble quaternary ammonium polymer in the presence of a small amount of a metal-free oxidizing agent.
Inventors
- 👤 Thomas Aitken
- 👤 Wilfred D. Pote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:53
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/29; C; C08; C08B; C08B31/00; C08L; C08L3/00; C08L3/02; D21H21/00; D21H21/06; D21H21/10; D21H21/14; D21H21/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
An improved method for the cationization of starch which comprises cooking starch at a temperature and for a period of time to cause gelation and under alkaline conditions with a water soluble quaternary ammonium polymer in the presence of an oxidizing agent from the group consisting of ammonium persulfate, potassium persulfate, hydrogen peroxide, sodium hypochlorite, ozone, and t-butyl hydroperoxide.
Claim 2
Dependent Claim
59 words
An improved method for the cationization of starch which comprises cooking starch at a temperature and for a period of time to cause gelation and under alkaline conditions with a water soluble quaternary ammonium polymer in the presence of an oxidizing agent from the group consisting of ammonium persulfate, potassium persulfate, hydrogen peroxide, sodium hypochlorite, ozone, and t-butyl hydroperoxide.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the metal-free oxidizing agent is potassium persulfate.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the metal-free water soluble inorganic oxidizing agent is ammonium persulfate.
Claim 5
Dependent Claim
17 words
The method of claim 3 where the oxidizing agent is applied to the starch prior to cooking.
Claim 6
Dependent Claim
23 words
The method of claim 4 where the starch is cooked in a jet cooker at a temperature within the range of 212°-320° F.
Claim 7
Dependent Claim
126 words
An improved method of cationizing starch which comprises forming 1-10% aqueous slurry of starch and then cooking the starch at a temperature and for a period of time to cause gelatinization thereof in the presence of from 0.5-10% by weight of sodium hydroxide with from 1-15% by weight of a water soluble quaternary ammonium polymer selected from the group consisting of quaternized polyepichlorohydrin polymers, dimethylamine epichlorohydrin polymers, epichlorohydrin-dimethylamine-ammonia polymers, quaternized polyethyleneimines, quaternized ethylene dichloride-ammonia polymers, and quaternized diallylamine polymers, said cooking being done in the presence of from 0.04-1.0% by weight based on the weight of the dry starch present in the slurry of a water soluble oxidizing agent from the group consisting of ammonium persulfate, potassium persulfate, hydrogen peroxide, sodium hypochlorite, ozone, and t-butyl hydroperoxide.
Claim 8
Dependent Claim
126 words
An improved method of cationizing starch which comprises forming 1-10% aqueous slurry of starch and then cooking the starch at a temperature and for a period of time to cause gelatinization thereof in the presence of from 0.5-10% by weight of sodium hydroxide with from 1-15% by weight of a water soluble quaternary ammonium polymer selected from the group consisting of quaternized polyepichlorohydrin polymers, dimethylamine epichlorohydrin polymers, epichlorohydrin-dimethylamine-ammonia polymers, quaternized polyethyleneimines, quaternized ethylene dichloride-ammonia polymers, and quaternized diallylamine polymers, said cooking being done in the presence of from 0.04-1.0% by weight based on the weight of the dry starch present in the slurry of a water soluble oxidizing agent from the group consisting of ammonium persulfate, potassium persulfate, hydrogen peroxide, sodium hypochlorite, ozone, and t-butyl hydroperoxide.
Claim 9
Dependent Claim
28 words
The method of claim 6 where the water-soluble metal-free inorganic oxidizing agent is ammonium persulfate and the water-soluble cationic quaternary ammonium polymer is an epichlorohydrin dimethylamine ammonia polymer.
Claim 10
Dependent Claim
16 words
The method of claim 7 where the water soluble quaternary ammonium polymer is a quaternized polydiallylamine.
References Cited (Backward Citations)
US3674725A
Cited
US3931422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |