US4029885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic starch sizing
Assignee: ChampionX LLC
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Filing: 1975-12-31
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Granted: 1977-06-14
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Expires: 1995-12-31
Abstract
Abstract Paper and other cellulose materials are sized with a cationic starch which comprises the reaction product between an anionic starch and a condensate of epichlorohydrin with an equimolar quantity of dimethylamine, in which up to 30% molar ammonia may be substituted for a like molar amount of dimethylamine.
Inventors
- 👤 Peter D. Buikema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:16
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/29; C; C08; C08B; C08B31/00; C08B31/08; C08B31/12; C08B31/125; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31975; Y10T428/31978
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
73 words
A method of making gelatinized cationic starch useful in sizing and coating cellulosic materials which comprises the steps of: A. gelatinizing a granular anionic starch; B. adding to said starch during the course of gelatinization 1-10% by weight of a condensate of generally equimolar quantities of epichlorohydrin and dimethylamine wherein the percentage of said condensate is calculated from granular anionic starch; C. completing said gelatinization; and then, D. recovering the gelatinized cationic starch.
Claim 2
Independent Claim
73 words
A method of making gelatinized cationic starch useful in sizing and coating cellulosic materials which comprises the steps of: A. gelatinizing a granular anionic starch; B. adding to said starch during the course of gelatinization 1-10% by weight of a condensate of generally equimolar quantities of epichlorohydrin and dimethylamine wherein the percentage of said condensate is calculated from granular anionic starch; C. completing said gelatinization; and then, D. recovering the gelatinized cationic starch.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein 2-6% by weight of the condensate is added, based on the granular anionic starch.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein up to 30% molar ammonia is substituted for the dimethylamine.
Claim 5
Independent Claim
87 words
A method of making gelatinized cationic starch useful in surface sizing and coating of cellulosic materials which comprises the steps of: A. producing gelatinous anionic starch from granular anionic starch; B. reacting the gelatinous anionic starch over a period of 10 minutes to 24 hours and at a temperature of 30°-100° C with 1-10% by weight of a condensate of generally equimolar quantities of epichlorohydrin and dimethylamine wherein the percentage of said condensate is calculated from the granular anionic starch; and, C. recovering the gelatinized cationic starch.
Claim 6
Independent Claim
87 words
A method of making gelatinized cationic starch useful in surface sizing and coating of cellulosic materials which comprises the steps of: A. producing gelatinous anionic starch from granular anionic starch; B. reacting the gelatinous anionic starch over a period of 10 minutes to 24 hours and at a temperature of 30°-100° C with 1-10% by weight of a condensate of generally equimolar quantities of epichlorohydrin and dimethylamine wherein the percentage of said condensate is calculated from the granular anionic starch; and, C. recovering the gelatinized cationic starch.
Claim 7
Dependent Claim
20 words
The method of claim 4 wherein 2-6% by weight of the condensate is added, based on the granular anionic starch.
Claim 8
Dependent Claim
16 words
The method of claim 4 wherein up to 30% molar ammonia is substituted for the dimethylamine.
Claim 9
Dependent Claim
25 words
A method of surface sizing and coating cellulosic materials which comprises coating said cellulosic materials with 1.5-12.5% by weight of the composition of claim 1.
Claim 10
Dependent Claim
25 words
A method of surface sizing and coating cellulosic materials which comprises coating said cellulosic materials with 3.0-7.5% by weight of the composition of claim 1.
Claim 11
Dependent Claim
25 words
A method of surface sizing and coating cellulosic materials which comprises coating said cellulosic materials with 1.5-12.5% by weight of the composition of claim 4.
Claim 12
Dependent Claim
25 words
A method of surface sizing and coating cellulosic materials which comprises coating said cellulosic materials with 3.0-7.5% by weight of the composition of claim 4.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |