Patent US4921903A successfully refreshed from Google Patents.
US4921903A
Expired / Lapsed
US
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Process for preparing high molecular weight hydrophobic acrylamide polymers
Assignee: ChampionX LLC
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Filing: 1988-10-11
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Granted: 1990-05-01
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Expires: 2008-10-11
Abstract
Abstract A process of making a water-in-oil emulsion which contains from 5-60% by weight of a hydrophobic acrylamide terpolymer composed of the random repeating units: ##STR1## where: R is methyl or hydrogen, M is hydrogen, alkali metal, ammonia, or amine, R 1 is a hydrophobic radical, with the mol ratio of A:B:C being A(2-50):B(50-98):C(0.1-15), which comprises reacting a 5-60% by weight water-in-oil emulsion of an acrylamide polymer with a hydrophobic amine at a temperature above 120° C. for a period of time sufficient to transamidate the acrylamide groups in the acrylamide polymer with the hydrophobic amine.
Inventors
- 👤 Dodd W. Fong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:21
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A process of making a water-in-oil emulsion which contains from 5-60% by weight of a hydrophobic acrylamide terpolymer composed of the random repeating units: ##STR3## where: R is methyl or hydrogen, M is hydrogen, alkali metal, ammonia, or amine, R 1 is a hydrophobic radical, with the mol ratio of A:B:C being A(2-50):B(50-98):C(0.1-15), which comprises reacting a 5-60% by weight water-in-oil emulsion of an acrylamide polymer with a hydrophobic amine at a temperature above 120° C. for a period of time sufficient to transamidate the acrylamide groups in the acrylamide polymer with the hydrophobic amine.
Claim 2
Dependent Claim
95 words
A process of making a water-in-oil emulsion which contains from 5-60% by weight of a hydrophobic acrylamide terpolymer composed of the random repeating units: ##STR3## where: R is methyl or hydrogen, M is hydrogen, alkali metal, ammonia, or amine, R 1 is a hydrophobic radical, with the mol ratio of A:B:C being A(2-50):B(50-98):C(0.1-15), which comprises reacting a 5-60% by weight water-in-oil emulsion of an acrylamide polymer with a hydrophobic amine at a temperature above 120° C. for a period of time sufficient to transamidate the acrylamide groups in the acrylamide polymer with the hydrophobic amine.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the ratio of A:B:C is: A(2-35):B(55-98):C(0.1-10).
Claim 4
Dependent Claim
18 words
The process of claim 1 where R 1 is a hydrocarbon radical containing at least 3 carbon atoms.
Claim 5
Dependent Claim
18 words
The process of claim 2 where R 1 is a hydrocarbon radical of at least 3 carbon atoms.
Claim 6
Dependent Claim
14 words
The process of claim 3 where R 1 contains at least 12 carbon atoms.
Claim 7
Dependent Claim
18 words
The process of claim 4 where R 1 is a hydrocarbon radical containing at least 12 carbon atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |