US4656232A
Expired / Lapsed
US
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Method for production of polymer
Assignee: Nippon Shokubai Co Ltd
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Filing: 1985-11-18
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Granted: 1987-04-07
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Expires: 2005-11-18
Abstract
Abstract A method for the production of a polymer from an aqueous solution of a corresponding α, β-ethylenically unsaturated monomer, which method is characterized by forwarding said aqueous monomer solution and an inert gas each in the form of a continuous flow toward the site of polymerization, spouting either of said two fluids through a nozzle parallelly into the flow of the other fluid thereby creating forced contact between said aqueous monomer solution and said inert gas and effecting substantial removal of dissolved oxygen from said aqueous monomer solution before said aqueous monomer solution reaches the site of polymerization.
Inventors
- 👤 Masashi Nakaki
- 👤 Katsumi Terawaki
- 👤 Tadao Shimomura
- 👤 Kazumasa Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:21
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/06; C08F6/10; C08F2/00; C08F2/04; C08F2/10; B; B01; B01D; B01D19/00; B01D19/0005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
In a method for the production of a polymer from an aqueous solution of a corresponding α, β-ethylenically unsaturated monomer, the step of effecting substantial removal of dissolved oxygen from said aqueous monomer solution before said aqueous monomer solution reaches the site of polymerization, which comprises forwarding said aqueous monomer solution and an inert gas each in the form of a continuous flow toward the site of polymerization, spouting either of said two fluids through a nozzle parallelly into the flow of the other fluid thereby creating forced contact between said aqueous monomer solution and said inert gas.
Claim 2
Dependent Claim
98 words
In a method for the production of a polymer from an aqueous solution of a corresponding α, β-ethylenically unsaturated monomer, the step of effecting substantial removal of dissolved oxygen from said aqueous monomer solution before said aqueous monomer solution reaches the site of polymerization, which comprises forwarding said aqueous monomer solution and an inert gas each in the form of a continuous flow toward the site of polymerization, spouting either of said two fluids through a nozzle parallelly into the flow of the other fluid thereby creating forced contact between said aqueous monomer solution and said inert gas.
Claim 3
Dependent Claim
38 words
A method according to claim 1, wherein the speed at which said one fluid spouted into said flow of said other fluid passes the narrowest point of said nozzle is equal to at least a Reynolds number 1,000.
Claim 4
Dependent Claim
33 words
A method according to claim 2, wherein the ratio of the amount of said inert gas to that of said aqueous monomer solution is in the range of 0.1 to 10 by volume.
Claim 5
Dependent Claim
38 words
A method according to claim 1, wherein an aspirator is used for spouting said one fluid through said nozzle into flow of said other fluid and creating forced contact bewteen said aqueous monomer solution and said inert gas.
Claim 6
Dependent Claim
38 words
A method according to claim 1, wherein an ejector is used for spouting said one fluid through said nozzle into flow of said other fluid and creating forced contact between said aqueous monomer solution and said inert gas.
Claim 7
Dependent Claim
28 words
A method according to claim 2, wherein said inert gas is at least one gas selected from the group consisting of nitrogen, carbon dioxide, argon, methane, and ethane.
Claim 8
Dependent Claim
28 words
A method according to claim 1, wherein said polymer is a cross linked polymer when said polymer is prepared from said aqueous solution of α, β-ethylenically unsaturated monomer.
References Cited (Backward Citations)
US4098977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |