US4530979A
Expired / Lapsed
US
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Continuous polymerization of water-miscible polymers
Assignee: Dow Chemical Co
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Filing: 1983-06-15
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Granted: 1985-07-23
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Expires: 2003-06-15
Abstract
Abstract A continuous adiabatic process for preparing water-miscible and water-soluble polymers wherein an aqueous solution containing monomer and an initiator system is passed through a reactor and reacted to yield a rapid increase in viscosity as polymerization occurs. The polymer product exhibits consistent cross-sectional properties in the reactor over time and moves slowly and easily through the reactor as a plug.
Inventors
- 👤 James R. Birch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:25
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/10; C08F2/12; C08F2/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A continuous adiabatic process for preparing water-miscible high molecular weight polymers which comprises passing an aqueous solution containing a water-miscible monomer mixture together with suitable initiators through a reactor, said monomer mixture being sufficiently reactive as to effect a rapid increase in viscosity as said monomer mixture is subjected to conditions sufficient to polymerize the monomer in the reactor, thereby forming the desired polymer product which exhibits consistent cross-sectional properties in the reactor over time, wherein said product so formed is in the form of a gel and moves consistently and easily through the reactor as a plug.
Claim 2
Dependent Claim
98 words
A continuous adiabatic process for preparing water-miscible high molecular weight polymers which comprises passing an aqueous solution containing a water-miscible monomer mixture together with suitable initiators through a reactor, said monomer mixture being sufficiently reactive as to effect a rapid increase in viscosity as said monomer mixture is subjected to conditions sufficient to polymerize the monomer in the reactor, thereby forming the desired polymer product which exhibits consistent cross-sectional properties in the reactor over time, wherein said product so formed is in the form of a gel and moves consistently and easily through the reactor as a plug.
Claim 3
Dependent Claim
12 words
A process of claim 1 wherein said reactor is tubular in shape.
Claim 4
Dependent Claim
10 words
A process of claim 1 wherein the polymer is water-soluble.
Claim 5
Dependent Claim
19 words
A process of claim 3 wherein the monomer mixture comprises acrylamide or a mixture of acrylic acid and acrylamide.
Claim 6
Dependent Claim
28 words
A process of claim 1 wherein said aqueous solution comprises from about 6 to about 30 weight percent monomer based on the total weight of the aqueous solution.
Claim 7
Dependent Claim
23 words
A process of claim 1 wherein said polymer product is passed through a secondary reactor to reduce the amount of residual, unreacted monomer.
Claim 8
Dependent Claim
28 words
A process of claim 1 wherein said aqueous solution comprises from about 15 to about 30 weight percent monomer based on the total weight of the aqueous solution.
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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |