Patent US824000A successfully refreshed from Google Patents.
Patent US4405728A successfully refreshed from Google Patents.
US4405728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for on-site mannich polymer process
Assignee: ChampionX LLC
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Filing: 1982-01-15
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Granted: 1983-09-20
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Expires: 2002-01-15
Abstract
Abstract The abstract of the disclosure is a method of rapidly preparing a dilute aqueous solution of poly N,N lower dialkylaminomethyl acrylamide and copolymers thereof having a molecular weight greater than 500,000 and a cationic charge of 1-90% which comprises: A. forming a water-in-oil emulsion of polyacrylamide or copolymers thereof, said water-in-oil emulsion containing in weight percentages: (1) 5 to 60% polymer; (2) 5 to 75% hydrophobic liquid; (3) 0.1 to 21% water-in-oil emulsifying agent; (4) 2 to 90% water; B. adding to the water-in-oil emulsion of step A a water soluble salt of a secondary amine having alkyl groups containing 1-3 carbon atoms in an amount, so as to provide 0.1-1.1 moles of secondary amine for each mole of amide functionality on said polymer; C. preparing a dry formaldehyde composition by mixing together: (1) paraformaldehyde; (2) dry alkalinity control agent (3) water-soluble high HLB surfactant capable of inverting the water-in-oil emulsion of step A; D. mixing together the water-in-oil emulsion containing the lower alkyl secondary amine salt with a quantity of the dry formaldehyde composition sufficient to provide from 0.1-1.1 mole of formaldehyde per mole of secondary amine and from 0.05-10% water-soluble surfactant based on the weight of water-in-oil emulsion used with a quantity of water, so as to obtain a 0.1-10% by weight aqueous solution of N,N-dialkylaminomethyl acrylamide.
Inventors
- 👤 Richard F. Krebs
- 👤 Patrick J. Marek
- 👤 Kenneth G. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:30
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08F; C08F8/00; C08F8/28; C08J2333/00; C08J2333/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
246 words
A method of rapidly preparing a dilute aqueous solution of poly N,N lower dialkylaminomethyl acrylamide and copolymers thereof having a molecular weight greater than 500,000 and a cationic charge of 1-9% which comprises: A. forming a water-in-oil emulsion of a water-soluble acrylamide polymer containing at least 10% by weight of acrylamide, said water-in-oil emulsion contaning in weight percentages: (1) 5 to 60% polymer; (2) 5 to 75% organic hydrophobic liquid; (3) 0.1 to 21% low HLB water-in-oil emulsifying agent; (4) 2 to 90% water; B. adding to the water-in-oil emulsion of step A a water-soluble salt of a secondary amine having alkyl groups contaning 1-3 carbon atoms in an amount so as to provide 0.1-1.1 moles of secondary amine for each mole of amide functionality on said polymer; C. preparing a dry formaldehyde composition by mixing together: (1) paraformaldehyde; (2) dry alkalinity control agent; (3) water-soluble high HLB surfactant capable of inverting the water-in-oil emulsion of step A, the dry alkalinity control agent being present in an amount to provide from 0.5-1.5 moles of neutralization capability per mole of formaldehyde; D. mixing together the water-in-oil emulsion containing the lower alkyl secondary amine salt with a quantity of the dry formaldehyde composition sufficient to provide from 0.1-1.1 mole of formaldehyde per mole of secondary amine and from 0.05-10% water-soluble surfactant based on the weight of water-in-oil emulsion used with a quantity of water, so as to obtain a 0.1-10% by weight aqueous solution of poly N,N-dialkylaminomethyl acrylamide.
Claim 2
Independent Claim
246 words
A method of rapidly preparing a dilute aqueous solution of poly N,N lower dialkylaminomethyl acrylamide and copolymers thereof having a molecular weight greater than 500,000 and a cationic charge of 1-9% which comprises: A. forming a water-in-oil emulsion of a water-soluble acrylamide polymer containing at least 10% by weight of acrylamide, said water-in-oil emulsion contaning in weight percentages: (1) 5 to 60% polymer; (2) 5 to 75% organic hydrophobic liquid; (3) 0.1 to 21% low HLB water-in-oil emulsifying agent; (4) 2 to 90% water; B. adding to the water-in-oil emulsion of step A a water-soluble salt of a secondary amine having alkyl groups contaning 1-3 carbon atoms in an amount so as to provide 0.1-1.1 moles of secondary amine for each mole of amide functionality on said polymer; C. preparing a dry formaldehyde composition by mixing together: (1) paraformaldehyde; (2) dry alkalinity control agent; (3) water-soluble high HLB surfactant capable of inverting the water-in-oil emulsion of step A, the dry alkalinity control agent being present in an amount to provide from 0.5-1.5 moles of neutralization capability per mole of formaldehyde; D. mixing together the water-in-oil emulsion containing the lower alkyl secondary amine salt with a quantity of the dry formaldehyde composition sufficient to provide from 0.1-1.1 mole of formaldehyde per mole of secondary amine and from 0.05-10% water-soluble surfactant based on the weight of water-in-oil emulsion used with a quantity of water, so as to obtain a 0.1-10% by weight aqueous solution of poly N,N-dialkylaminomethyl acrylamide.
Claim 3
Dependent Claim
44 words
The method of claim 1 wherein in step A the water-in-oil emulsion of the water-soluble acrylamide polymer contains: A. 20 to 40% polymer; B. 5 to 40% paraffinic hydrophobic liquid; C. 1 to 15% low HLB water-in-oil emulsifying agent; D. 20 to 70% water.
Claim 4
Dependent Claim
45 words
The method of claim 1 wherein in step A the water-in-oil emulsion of the water-soluble acrylamide polymer contains: A. 25 to b 35% polymer; B. 20 to 30% paraffinic hydrophobic liquid; C. 1.2 to 10% low HLB water-in-oil emulsifying agent; D. 30 to 55% water.
Claim 5
Dependent Claim
16 words
The method of claim 1 wheren the polymer of step A is a homopolymer of acrylamide.
Claim 6
Dependent Claim
44 words
The method of claim 1 wherein in step B from 0.75-1.1 mole of lower alkyl secondary amine is added per mole of amide functionality present in the polymer; and in step D, from 0.75-1.0 mole of formaldehyde is added per mole of secondary amine.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the water-soluble salt of the lower alkyl secondary amine is dimethylamine hydrochloride.
Claim 8
Dependent Claim
18 words
The method of claim 5 wherein the water-soluble salt of the lower alkyl secondary amine is dimethylamine sulfate.
Claim 9
Dependent Claim
11 words
The method of claim 1 wherein the secondary amine is dimethylamine.
Claim 10
Dependent Claim
11 words
The method of claim 5 wherein the secondary amine is dimethylamine.
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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) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |