US4079027A
Expired / Lapsed
US
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Quaternary modified acrylamide polymers
Assignee: ChampionX LLC
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Filing: 1976-10-28
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Granted: 1978-03-14
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Expires: 1996-10-28
Abstract
Abstract A method for the preparation of quaternary modified acrylamide polymers is disclosed. Applicable to both solutions of acrylamide polymer and to water-in-oil emulsions of finely divided acrylamide polymer, the method involves reacting the acrylamide with a secondary amine formaldehyde adduct followed by quaternization with an alkylating agent and then, stabilization. The composition of these polymers is also disclosed.
Inventors
- 👤 Kenneth G. Phillips
- 👤 Edward G. Ballweber
- 👤 Karen A. Nordquist
- 👤 Robert A. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:56
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A stable water soluble quaternary modified polymer which comprises: A. a solution of from 5-50% by weight of an acrylamide polymer having an intrinsic viscosity of from 0.1 to 0.7; which is then reacted with, B. an adduct of formaldehyde with a secondary amine containing 2-8 carbon atoms, of from 0.1 to 55% by weight in aqueous solution in a mole ratio of formaldehyde adduct to amide groups on said acrylamide polymer of between 1:2 to 2:1 to produce a water soluble cationically modified acrylamide polymer; to which is then added at an alkaline pH, C. an alkylating agent containing 1-7 carbon atoms in a mole ratio of from 2:1 to 1:2 to said cationically modified acrylamide polymer to produce a stable water soluble quaternary modified acrylamide polymer; to which is then added, D. sulfurous acid to a pH of 0-6 to produce a stable water soluble quaternary modified acrylamide polymer of greater stability.
Claim 2
Dependent Claim
154 words
A stable water soluble quaternary modified polymer which comprises: A. a solution of from 5-50% by weight of an acrylamide polymer having an intrinsic viscosity of from 0.1 to 0.7; which is then reacted with, B. an adduct of formaldehyde with a secondary amine containing 2-8 carbon atoms, of from 0.1 to 55% by weight in aqueous solution in a mole ratio of formaldehyde adduct to amide groups on said acrylamide polymer of between 1:2 to 2:1 to produce a water soluble cationically modified acrylamide polymer; to which is then added at an alkaline pH, C. an alkylating agent containing 1-7 carbon atoms in a mole ratio of from 2:1 to 1:2 to said cationically modified acrylamide polymer to produce a stable water soluble quaternary modified acrylamide polymer; to which is then added, D. sulfurous acid to a pH of 0-6 to produce a stable water soluble quaternary modified acrylamide polymer of greater stability.
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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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |