Patent US4622356A successfully refreshed from Google Patents.
US4622356A
Expired / Lapsed
US
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Polyacrylamide and polyacrylic acid polymers
Assignee: Wyeth Holdings LLC
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Filing: 1985-07-10
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Granted: 1986-11-11
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Expires: 2005-07-10
Abstract
Abstract The use of a cyclic compound containing a ##STR1## group, i.e., methone, has been found to allow a poor acrylamide or acrylic acid or 2-acrylamide-2-methylpropane sulfonic acid and its salts monomer to be polymerized to a polymer having improved performance characteristics and/or improved rates of polymerization. Optionally, urea is added with the methone.
Inventors
- 👤 Peter A. Jarovitzky
- 👤 Roger E. Neff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:40
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; C08F20/04; C08F20/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
59 words
In a process for producing a water-soluble high molecular weight polymer by polymerizing a monomer selected from acrylamide, acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid and its salts, or mixtures thereof, and drying the resulting polymer, the improvement comprising adding to said polymer, after polymerization and before drying, a cyclic organic compound which contains a 1,3-dione moiety of the formula: ##STR10##
Claim 2
Dependent Claim
59 words
In a process for producing a water-soluble high molecular weight polymer by polymerizing a monomer selected from acrylamide, acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid and its salts, or mixtures thereof, and drying the resulting polymer, the improvement comprising adding to said polymer, after polymerization and before drying, a cyclic organic compound which contains a 1,3-dione moiety of the formula: ##STR10##
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the 1,3-dione is present as about 0.001 to 2% by weight of the monomer.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the monomer is acrylamide.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the monomer is acrylic acid.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the monomer is 2-acrylamido-2-methylpropane sulfonic acid and its salts.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein the monomer is a mixture of acrylamide and acrylic acid.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the monomer is a mixture of acrylamide and 2-acrylamido-2-methylpropane sulfonic acid and its salts.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein the 1,3-dione is 5,5-dimethyl-1,3-cyclohexanedione or its tautomer 5,5-dimethyl-tetrahydro-m-resorcinol.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein the 1,3-dione is selected from the group consisting essentially of 1,3-cyclohexanedione, phloroglucinol, barbituric acid, carbmethoxy dimedone enolate, and carbethoxy dimedone enolate.
Claim 11
Dependent Claim
26 words
The process of claims 1, 8 or 9 wherein at least one additional ethylenically-unsaturated monomer is copolymerized with the monomer to produce a water soluble polymer.
Claim 12
Dependent Claim
17 words
The process of claims 1, 8 or 9 wherein urea is added to the monomer before polymerization.
Claim 13
Dependent Claim
28 words
The process of claims 1, 8 or 9 wherein urea is also added after polymerization, before, after or at the same time as the 1,3-dione and before drying.
References Cited (Backward Citations)
US3488269A
Cited
US4478944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |