Patent US3929751A successfully refreshed from Google Patents.
US3929751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight acrylamide polymer production by high solids solution polymerization
Assignee: Wyeth Holdings LLC
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Filing: 1971-04-14
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Granted: 1975-12-30
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Expires: 1991-04-14
Abstract
Abstract A method of producing non-carboxylated, water-soluble polymers of acrylamide of high molecular weight and high solids (30-60%) comprising polymerizing acrylamide at 10-30*C., a pH of 4.7 - 5.9 and in the presence of a sodium bromate-sodium sulfite catalyst and water, at least one dimension of the reaction media having a thickness of not more than about 3/4 inch, the concentration of said catalyst being determined by reference to the drawings.
Inventors
- 👤 David Benedict Gershberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:34
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
180 words
A METHOD OF PRODUCING A SUBSTANTIALLY COMPLETELY NONCARBOXYLATED, SUBSTANTIALLY COMPLECTELY WATER-SOLUBLE POLYMER OF ACRYLAMIDE HAVING AN INTRINSIC VISCOSITY OF AT LEAST 13 AND THEREFORE A MOLECULAR WEIGHT OF AT LEAST ABOUT 8 MILLION WHICH COMPRISES SUBJECTING A REACTION MEDIA CNSISTING ESSENTIALLY OF (A) ACRYLAMIDE, (B) UP TO 50%, BY WEIGHT, BASED ON THE WEIGHT OF ACRYLAMIDE, OF A MONOMER COPOLYMERIZABLE THEREWITH, (C) A SOIDUM BROMATE-SODIUM SULFITE CATALYST AND (D) WATER, TO POLYMERIZING CONDITIONS COMPRISING A TEMPERATURE OF FROM ABOUT 10*C. TO ABOUT 30*C. AND A PH OF FROM ABOUT 4.7 TO ABOUT 5.9, SAID REACTION MEDIA HAVING A MONOMER SOLIDS CONTENT OF FROM ABOUT 30% TO ABOUT 60%, AT LEAST ONE DIMENSION OF SAID REACTION MEDIA MASS HAVING A THICKNESS OF NOT MORE THAN ABOUT 3/4 INCH, THE CATALYST CONCENTRATION BEING (1) WITH THE AREA OF CURVE ABCDA OF THE DRAWINGS FOR AT LEAST 30% MONOMER SOLIDS, (2) WITHIN THE AREA OF CURVE EFGHE OF THE DRAWINGS FOR AT LEAST 40% MONOMER SOLIDS AND (3) WITHIN THE AREA OF CURVE JKLMJ OF THE DRAWINGS FOR AT LEAST 50% MONOMER SOLIDS.
Claim 2
Independent Claim
180 words
A METHOD OF PRODUCING A SUBSTANTIALLY COMPLETELY NONCARBOXYLATED, SUBSTANTIALLY COMPLECTELY WATER-SOLUBLE POLYMER OF ACRYLAMIDE HAVING AN INTRINSIC VISCOSITY OF AT LEAST 13 AND THEREFORE A MOLECULAR WEIGHT OF AT LEAST ABOUT 8 MILLION WHICH COMPRISES SUBJECTING A REACTION MEDIA CNSISTING ESSENTIALLY OF (A) ACRYLAMIDE, (B) UP TO 50%, BY WEIGHT, BASED ON THE WEIGHT OF ACRYLAMIDE, OF A MONOMER COPOLYMERIZABLE THEREWITH, (C) A SOIDUM BROMATE-SODIUM SULFITE CATALYST AND (D) WATER, TO POLYMERIZING CONDITIONS COMPRISING A TEMPERATURE OF FROM ABOUT 10*C. TO ABOUT 30*C. AND A PH OF FROM ABOUT 4.7 TO ABOUT 5.9, SAID REACTION MEDIA HAVING A MONOMER SOLIDS CONTENT OF FROM ABOUT 30% TO ABOUT 60%, AT LEAST ONE DIMENSION OF SAID REACTION MEDIA MASS HAVING A THICKNESS OF NOT MORE THAN ABOUT 3/4 INCH, THE CATALYST CONCENTRATION BEING (1) WITH THE AREA OF CURVE ABCDA OF THE DRAWINGS FOR AT LEAST 30% MONOMER SOLIDS, (2) WITHIN THE AREA OF CURVE EFGHE OF THE DRAWINGS FOR AT LEAST 40% MONOMER SOLIDS AND (3) WITHIN THE AREA OF CURVE JKLMJ OF THE DRAWINGS FOR AT LEAST 50% MONOMER SOLIDS.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein the monomer polymerized is acrylamide.
Claim 4
Dependent Claim
16 words
A method according to claim 1 wherein the monomer solids concentration is at least about 45%.
Claim 5
Dependent Claim
12 words
A method according to claim 1 wherein the pH is About 5.5.
Claim 6
Dependent Claim
19 words
A method according to claim 1 wherein the reaction media mass has a thickness of 1/8 - 3/4 inches.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |