US4066522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of high molecular weight acrylamide polymers
Assignee: Japan Atomic Energy Agency
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Filing: 1976-01-14
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Granted: 1978-01-03
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Expires: 1996-01-14
Abstract
Abstract High molecular weight water-soluble acrylamide polymers can be produced in good yield by irradiating a solution comprising acetone, water and acrylamide with an ionizing radiation in the presence of an alkaline salt.
Inventors
- 👤 Sueo Machi
- 👤 Takeshi Wada
- 👤 Hiroshi Sekiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:55
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
58 words
A process for the production of high molecular weight acrylamide polymers which comprises irradiating a solution comprising acetone, water and an acryalmide monomer with an ionizing radiation in the presence of an alkaline salt in an amount ranging from about 0.01 through about 10 mol % based on the total amount of monomer or monomers to be polymerized.
Claim 2
Dependent Claim
58 words
A process for the production of high molecular weight acrylamide polymers which comprises irradiating a solution comprising acetone, water and an acryalmide monomer with an ionizing radiation in the presence of an alkaline salt in an amount ranging from about 0.01 through about 10 mol % based on the total amount of monomer or monomers to be polymerized.
Claim 3
Dependent Claim
74 words
A process for the production of high molecular weight acrylamide polymers which comprises irradiating a solution comprising 5 - 60% by volume of water, 5 - 50% by volume of an acrylamide monomer and the balance volume of acetone with an ionizing radiation in the presence of an alkaline salt in an amount ranging from about 0.01 through about 10 mol % based on the total amount of monomer or monomers to be polymerized.
Claim 4
Dependent Claim
74 words
A process for the production of high molecular weight acrylamide polymers which comprises irradiating a solution comprising 5 - 60% by volume of water, 5 - 50% by volume of an acrylamide monomer and the balance volume of acetone with an ionizing radiation in the presence of an alkaline salt in an amount ranging from about 0.01 through about 10 mol % based on the total amount of monomer or monomers to be polymerized.
Claim 5
Dependent Claim
86 words
A process for the production of high molecular weight acrylamide polymers which comprises irradiating a solution comprising 5 - 60% by volume of water, 5 - 50% by volume of an acrylamide monomer and the balance volume of acetone with an ionizing radiation at a dose rate ranging from 10 roentgens/hr through 10 6 roentgens/hr in the presence of an alkaline salt in an amount ranging from about 0.01 through about 10 mol % based on the total amount of monomer or monomers to be polymerized.
Claim 6
Dependent Claim
86 words
A process for the production of high molecular weight acrylamide polymers which comprises irradiating a solution comprising 5 - 60% by volume of water, 5 - 50% by volume of an acrylamide monomer and the balance volume of acetone with an ionizing radiation at a dose rate ranging from 10 roentgens/hr through 10 6 roentgens/hr in the presence of an alkaline salt in an amount ranging from about 0.01 through about 10 mol % based on the total amount of monomer or monomers to be polymerized.
Claim 7
Dependent Claim
97 words
A process for the production of high molecular weight acrylamide polymers which comprises irradiating a solution comprising 5 - 60% by volume of water, 5 - 50% by volume of an acrylamide monomer and the balance volume of acetone with an ionizing radiation at a dose rate ranging from 10 through 10 6 roentgens/hour at a temperature in the range of -20° C through 50° C in the presence of an alkaline salt in an amount ranging from about 0.01 through about 10 mol % based on the total amount of monomer or monomers to be polymerized.
Claim 8
Dependent Claim
97 words
A process for the production of high molecular weight acrylamide polymers which comprises irradiating a solution comprising 5 - 60% by volume of water, 5 - 50% by volume of an acrylamide monomer and the balance volume of acetone with an ionizing radiation at a dose rate ranging from 10 through 10 6 roentgens/hour at a temperature in the range of -20° C through 50° C in the presence of an alkaline salt in an amount ranging from about 0.01 through about 10 mol % based on the total amount of monomer or monomers to be polymerized.
Claim 9
Dependent Claim
23 words
A process of claim 1 in which the monomer to be polymerized is acrylamide or a mixture of acrylamide and another monovinyl monomer.
Claim 10
Dependent Claim
36 words
A process of claim 5 in which the monovinyl monomer is a member selected from the group consisting of acrylic acid, methacrylic acid, alkali metal salts of acrylic and methacrylic acid, vinylpyridine and dimethyl aminoethyl methacrylate.
Claim 11
Dependent Claim
40 words
A process of claim 1 in which the alkaline salt is a member selected from the group consisting of Na 2 CO 3 , K 2 CO 3 , CH 3 COONa, NaNO 2 and Na 3 PO 4 .
Claim 12
Dependent Claim
40 words
A process of claim 2 in which the alkaline salt is a member selected from the group consisting of Na 2 CO 3 , K 2 CO 3 , CH 3 COONa, NaNO 2 and Na 3 PO 4 .
Claim 13
Dependent Claim
40 words
A process of claim 3 in which the alkaline salt is a member selected from the group consisting of Na 2 CO 3 , K 2 CO 3 , CH 3 COONa, NaNO 2 and Na 3 PO 4 .
Claim 14
Dependent Claim
40 words
A process of claim 4 in which the alkaline salt is a member selected from the group consisting of Na 2 CO 3 , K 2 CO 3 , CH 3 COONa, NaNO 2 and Na 3 PO 4 .
Claim 15
Dependent Claim
40 words
A process of claim 5 in which the alkaline salt is a member selected from the group consisting of Na 2 CO 3 , K 2 CO 3 , CH 3 COONa, NaNO 2 and Na 3 PO 4 .
Claim 16
Dependent Claim
40 words
A process of claim 6 in which the alkaline salt is a member selected from the group consisting of Na 2 CO 3 , K 2 CO 3 , CH 3 COONa, NaNO 2 and Na 3 PO 4 .
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |