US4154910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing acrylamide polymers
Assignee: Kyoritsu Yuki Co Ltd
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Filing: 1977-05-10
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Granted: 1979-05-15
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Expires: 1997-05-10
Abstract
Abstract Concentrated aqueous solution of acrylamide or mixture of acrylamide and other vinyl monomer is polymerized in the presence of catalyst, and the polymerization solution is to be boiled by heat of polymerization in the course of polymerization. Obtained hydrous gels of acrylamide polymers are porous, water soluble and are easily dehydrated by conventional dehydration techniques.
Inventors
- 👤 Katsutoshi Tanaka
- 👤 Kazuo Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; C08J2333/00; C08J2333/24; C08J2333/26; Y; Y10; Y10S; Y10S524/00; Y10S524/922
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A method for producing water soluble acrylamide polymers which comprises polymerizing an aqueous solution of acrylamide or mixture of acrylamide and up to 50 mol % based on the total monomer of copolymerizable vinyl monomer in a concentration of 30 to 70% by weight in the presence of polymerization initiator, wherein the heat of polymerization itself causes the polymerization mixture to boil for a brief period during the course of polymerization and wherein said polymerization is initiated at about room temperature, boiling commences from 5 to 20 minutes after initiation and lasts for from 1 to 5 minutes, and the distance from the bottom of the polymerization vessel to the surface of the reaction mixture does not exceed about 500 mm.
Claim 2
Independent Claim
121 words
A method for producing water soluble acrylamide polymers which comprises polymerizing an aqueous solution of acrylamide or mixture of acrylamide and up to 50 mol % based on the total monomer of copolymerizable vinyl monomer in a concentration of 30 to 70% by weight in the presence of polymerization initiator, wherein the heat of polymerization itself causes the polymerization mixture to boil for a brief period during the course of polymerization and wherein said polymerization is initiated at about room temperature, boiling commences from 5 to 20 minutes after initiation and lasts for from 1 to 5 minutes, and the distance from the bottom of the polymerization vessel to the surface of the reaction mixture does not exceed about 500 mm.
Claim 3
Dependent Claim
11 words
A method according to claim 1, wherein the monomer is acrylamide.
Claim 4
Dependent Claim
24 words
A process according to claim 1, wherein the monomer is a mixture of acrylamide and up to 50 mole % of copolymerizable vinyl monomer.
Claim 5
Dependent Claim
25 words
A method according to claim 1, wherein the copolymerizable vinyl monomer is selected from the group consisting of 2-methacryloyloxytrimethylammonium chloride, N,N-dimethylacrylamide, diethylaminoethylmethacrylate and acrylic acid.
Claim 6
Dependent Claim
14 words
A porous hydrous gel of acrylamide polymers obtained by the method of claim 1.
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) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |