US3666751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic starch product in liquid form
Assignee: Indopco Inc
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Filing: 1970-02-27
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Granted: 1972-05-30
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Expires: 1990-02-27
Abstract
Abstract Novel liquid cationic starch derivatives and methods for their preparation are described. The derivatives, prepared by reaction of starch with epichlorohydrin-ammonium hydroxide condensates, are useful as additives in the manufacture of paper wherein they increase the retention of inorganic pigments by the cellulose pulp and strengthen the resulting paper.
Inventors
- 👤 Wadym Jarowenko
- 👤 Morton W Rutenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:56
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: 6
Claim 1
Independent Claim
30 words
The method of claim 1, wherein said reaction is conducted at a temperature from about 35* to 45* C. and for a period of from about 4 to 18 hours.
Claim 2
Dependent Claim
23 words
The method of claim 1, wherein a cross-linking inhibitor is present during said reaction between the gelatinized starch and the epichlorohydrin-ammonium hydroxide condensate.
Claim 3
Dependent Claim
10 words
The starch derivative prepared by the process of claim 1.
Claim 4
Independent Claim
94 words
A method for preparing an aqueous dispersion of a cationic starch derivative which comprises gelatinizing a starch and essentially simultaneously therewith, reacting from about 1 to 20 parts, by weight, of said gelatinized starch, in aqueous medium under alkaline conditions, with one part, by weight, of an epichlorohydrin-ammonium hydroxide condensate resulting from the condensation reaction at 10* - 60* C. of from about 0.8 - 3.0 moles of epichlorohydrin per mole of ammonium hydroxide; said essentially simultaneous starch gelatinization and starch-epichlorohydrin-ammonium hydroxide condensate reaction being conducted at a temperature of at least 120* C.
Claim 5
Dependent Claim
22 words
The method of claim 5, wherein a crosslinking inhibitor is present during said reaction between the starch and the epichlorohydrin-ammonium hydroxide condensate.
Claim 6
Dependent Claim
10 words
The starch derivative prepared by the process of claim 5.
References Cited (Backward Citations)
CA715566A
Cited
US2813093A
Cited
US2876217A
Cited
US2995513A
Cited
US3087852A
Cited
US3247048A
Cited
US3459632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |