US3902958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making improved paper and paper products
Assignee: ChampionX LLC
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Filing: 1974-01-30
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Granted: 1975-09-02
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Expires: 1994-01-30
Abstract
Abstract Improved paper and paper products are produced by adding to an aqueous suspension of paper pulp fibers from 0.01 - 10% by weight, based on the dry weight of the pulp, of a liquid dispersion of a water-soluble anionic vinyl addition polymer and a water-soluble cationic polymer.
Inventors
- 👤 Danny L Breen
- 👤 Alvin J Frisque
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:23
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/375; D21H17/46; D21H17/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A PROCESS FOR MANUFACTURING PAPER HAVING IMPROVED PROPERTIES WHICH COMPRISES THE STEPS OF: A. ADDING TO A CONCENTRATED AQUEOUS SUSPENSION OF PAPER PULP FIBERS CONTAINING AT LEAST 2% BY WEIGHT OF A POLYVALENT METAL SALT FROM 0.1 TO 10% BY WEIGHT BASED ON THE DRY WEIGHT OF THE PULP OF A STABLE LIQUID DISPERSION OF A WATERSOLUBLE ANIONIC VINYL ADDITION POLYMER AND A WATER-SOLUBLE CATIONIC POLYMER COMPRISING: A. APOLYMERIC LATEX COMPOUND OF A WATER-IN-OIL EMULSION WHICH CONTAINS DISPERSED THEREIN A FINELY DIVIDED WATERSOLUBLE ANIONIC VINYL ADDITION POLYMER, SAID POLYMERIC LATEX HAVING UNFROMLY DISTRIBUTED THROUGHOUT, B. A WATER-SOLUBLE CATIONIC POLYMER: WITH THE RATIO OF (A) TO (B) BEING WITHIN THE RANGE OF 1:10 TO 10:1 AND THE TOTAL AMOUNT OF A AND B PRESENT WITHIN SAID DISPERSION BEING WITHIN THE RANGE OF FROM 0.001 TO 75% WHEREIN A STABLE DISPERSION OF PULP CONTAINING UNIFORMLY DISPERSED POLYMERS WITHOUT GELLATION IS FORMED, B. DILUTING THE STABLE DISPERSION OF PULP CONTAINING UNIFORMLY DISPERSED POLYMERS WITH WATER TO EFFECT GELLATION OF THE SAID POLYMERS: AND THEN C. PROCESSING THE PULP INTO A PAPER HAVING IMPROVED PROPERTIES.
Claim 2
Dependent Claim
181 words
A PROCESS FOR MANUFACTURING PAPER HAVING IMPROVED PROPERTIES WHICH COMPRISES THE STEPS OF: A. ADDING TO A CONCENTRATED AQUEOUS SUSPENSION OF PAPER PULP FIBERS CONTAINING AT LEAST 2% BY WEIGHT OF A POLYVALENT METAL SALT FROM 0.1 TO 10% BY WEIGHT BASED ON THE DRY WEIGHT OF THE PULP OF A STABLE LIQUID DISPERSION OF A WATERSOLUBLE ANIONIC VINYL ADDITION POLYMER AND A WATER-SOLUBLE CATIONIC POLYMER COMPRISING: A. APOLYMERIC LATEX COMPOUND OF A WATER-IN-OIL EMULSION WHICH CONTAINS DISPERSED THEREIN A FINELY DIVIDED WATERSOLUBLE ANIONIC VINYL ADDITION POLYMER, SAID POLYMERIC LATEX HAVING UNFROMLY DISTRIBUTED THROUGHOUT, B. A WATER-SOLUBLE CATIONIC POLYMER: WITH THE RATIO OF (A) TO (B) BEING WITHIN THE RANGE OF 1:10 TO 10:1 AND THE TOTAL AMOUNT OF A AND B PRESENT WITHIN SAID DISPERSION BEING WITHIN THE RANGE OF FROM 0.001 TO 75% WHEREIN A STABLE DISPERSION OF PULP CONTAINING UNIFORMLY DISPERSED POLYMERS WITHOUT GELLATION IS FORMED, B. DILUTING THE STABLE DISPERSION OF PULP CONTAINING UNIFORMLY DISPERSED POLYMERS WITH WATER TO EFFECT GELLATION OF THE SAID POLYMERS: AND THEN C. PROCESSING THE PULP INTO A PAPER HAVING IMPROVED PROPERTIES.
Claim 3
Dependent Claim
42 words
The process of claim 1 where the weight ratio of (a) to (b) is within the range of from 1:5 to 5:1 and the amount of (a) plus (b) present within said dispersion is within the range of from 5-40% by weight.
Claim 4
Dependent Claim
42 words
The process of claim 1 where the weight ratio of (a) to (b) is within the range of from 1:2 to 2:1 and the amount of (a) plus (b) present within said dispersion is within the range of from 10-30% by weight.
Claim 5
Dependent Claim
12 words
The process of claim 1 where the pulp is a sulfate pulp.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |