US4066495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making paper containing cationic starch and an anionic retention aid
Assignee: Anheuser Busch Companies LLC
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Filing: 1974-06-26
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Granted: 1978-01-03
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Expires: 1994-06-26
Abstract
Abstract This application covers the use of a cationic starch and a polyacrylamide polymer as a retention aid in the manufacture of paper. The resulting paper containing the additives is characterized by improved retention of pigments.
Inventors
- 👤 John E. Voigt
- 👤 Herbert Pender, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:40
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/375; C; C08; C08L; C08L3/00; C08L3/04; C08L3/08; D21H17/21; D21H17/24; D21H17/28; D21H17/29
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
A method of papermaking comprising the steps of adding from about 0.015% to about 4% by weight based on the weight of dry pulp of a cationic starch having a degree of substitution of about 0.0034 to about 0.07 and consisting essentially of the reaction product of starch and an amine alkene halide salt and from about 5 ppm to about 250 ppm based on dry pulp of an anionic polyacrylamide polymer to the pulp in a papermaking process prior to depositing the pulp on a screen, said polymer having an average molecular weight of about 4 × 10 6 to about 6 × l0 6 .
Claim 2
Independent Claim
107 words
A method of papermaking comprising the steps of adding from about 0.015% to about 4% by weight based on the weight of dry pulp of a cationic starch having a degree of substitution of about 0.0034 to about 0.07 and consisting essentially of the reaction product of starch and an amine alkene halide salt and from about 5 ppm to about 250 ppm based on dry pulp of an anionic polyacrylamide polymer to the pulp in a papermaking process prior to depositing the pulp on a screen, said polymer having an average molecular weight of about 4 × 10 6 to about 6 × l0 6 .
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the cationic starch is 1-chloro-4-butenyltrimethylammonium chloride.
References Cited (Backward Citations)
CA657187A
Cited
US3378547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |