US3926718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of improving water drainage from paper webs by addition of a water soluble block polymer to a cellulosic pulp slurry
Assignee: Calgon Corp
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Filing: 1974-04-30
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Granted: 1975-12-16
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Expires: 1994-04-30
Abstract
Abstract The use of water-soluble block polymers of the A-B-A type wherein the A block is derived from a water-soluble monomer and the B block is derived from N-vinyl pyrrolidone as drainage and retention aids for paper webs wherein the polymer is added to a cellulosic pulp slurry.
Inventors
- 👤 Lawrence James Guilbault
- 👤 James Richard Zakrzewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:01
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/455
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A PROCESS OF IMPROVING WATER DRINAGE FROM PAPER WEBS COMPRISING ADDING TO A CELLULOSIC PULP SLURRY ABOUT 0.001 TO ABOUT 1%, BASED ON THE DRY WEIGHT OF PULP FIBERS, OF A POLYMER OF THE FORMULA A-B-A WHEREIN THE A BLOCK REPRESENTS FROM 10 TO 100,000 MER UNITS OF A WATER-SOLUBLE MONOMER SELECTED FROM THE GROUP CONSISTING OF 3-ACRYLAMIDO-3-METHYL BUTYL TRIMETHYL AMMONIUM CHLORIDE, 2-ACRYLAMIDO-2-METHYL PROPANE SULFONIC ACID, DIMETHYL DIALLYL AMMONIUM CHLORIDE, METHACRYLOYLOXYETHYL TRIMETHYL AMMONIUM CHLORIDE, METHACRYLOYLOXYETHYL TRIMETHYL AMMONIUM METHOSULFATE AND ACRYLAMIDE AND THE B BLOCK REPRESENTS FROM 10 TO 5,000 MER UNITS OF N-VINYLPYRROLIDONE, DEPOSITING THE PULP ONTO A FORMING SURFACE AND DRAINING THE WATER FROM THE FIBER NETWORK.
Claim 2
Dependent Claim
108 words
A PROCESS OF IMPROVING WATER DRINAGE FROM PAPER WEBS COMPRISING ADDING TO A CELLULOSIC PULP SLURRY ABOUT 0.001 TO ABOUT 1%, BASED ON THE DRY WEIGHT OF PULP FIBERS, OF A POLYMER OF THE FORMULA A-B-A WHEREIN THE A BLOCK REPRESENTS FROM 10 TO 100,000 MER UNITS OF A WATER-SOLUBLE MONOMER SELECTED FROM THE GROUP CONSISTING OF 3-ACRYLAMIDO-3-METHYL BUTYL TRIMETHYL AMMONIUM CHLORIDE, 2-ACRYLAMIDO-2-METHYL PROPANE SULFONIC ACID, DIMETHYL DIALLYL AMMONIUM CHLORIDE, METHACRYLOYLOXYETHYL TRIMETHYL AMMONIUM CHLORIDE, METHACRYLOYLOXYETHYL TRIMETHYL AMMONIUM METHOSULFATE AND ACRYLAMIDE AND THE B BLOCK REPRESENTS FROM 10 TO 5,000 MER UNITS OF N-VINYLPYRROLIDONE, DEPOSITING THE PULP ONTO A FORMING SURFACE AND DRAINING THE WATER FROM THE FIBER NETWORK.
Claim 3
Dependent Claim
12 words
A process as in claim 1 wherein the water-soluble monomer is acrylamide.
Claim 4
Dependent Claim
15 words
A process as in claim 1 wherein the water-soluble monomer is 2-acrylamido-2-methyl propane sulfonic acid.
Claim 5
Dependent Claim
15 words
A process as in claim 1 wherein the water-soluble monomer is methacryloyloxyethyl trimethyl ammonium chloride.
Claim 6
Dependent Claim
103 words
A process of improving the retention of inorganic fillers in the processing of paper which comprises the step of adding to an aqueous paper pulp suspension about 0.001 to about 1%, based on the dry weight of pulp fibers, of a polymer of the formula A-B-A wherein the A block represents from 10 to 100,000 mer units of a water-soluble monomer selected from the group consisting of 3-acrylamido-3-methyl butyl trimethyl ammonium chloride, 2-acrylamido-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium methosulfate and acrylamide and the B block represents from 10 to 5,000 mer units of N-vinyl(pyrrolidone).
Claim 7
Dependent Claim
103 words
A process of improving the retention of inorganic fillers in the processing of paper which comprises the step of adding to an aqueous paper pulp suspension about 0.001 to about 1%, based on the dry weight of pulp fibers, of a polymer of the formula A-B-A wherein the A block represents from 10 to 100,000 mer units of a water-soluble monomer selected from the group consisting of 3-acrylamido-3-methyl butyl trimethyl ammonium chloride, 2-acrylamido-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium methosulfate and acrylamide and the B block represents from 10 to 5,000 mer units of N-vinyl(pyrrolidone).
Claim 8
Dependent Claim
12 words
A process as in claim 5 wherein the water-soluble monomer is acrylamide.
Claim 9
Dependent Claim
15 words
A process as in claim 5 wherein the water-soluble monomer is 2-acrylamido-2-methyl propane sulfonic acid.
Claim 10
Dependent Claim
15 words
A process as in claim 5 wherein the water-soluble monomer is methacryloyloxyethyl trimethyl ammonium chloride.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |