US4391932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycationic latices of dimethylaminopropyl-acrylamide, and their use of as sludge dewatering agents and/or paper retention aids
Assignee: ChampionX LLC
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Filing: 1982-01-22
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Granted: 1983-07-05
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Expires: 2002-01-22
Abstract
Abstract Water-in-oil emulsions of copolymers of acrylamide and dimethylaminopropylacrylamide are disclosed. These polymers find use as retention aids in the manufacture of paper and as dewatering agents for municipal and industrial aqueous waste materials. Methods of preparing these polymers are disclosed.
Inventors
- 👤 Wun T. Tai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:36
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/455; C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08F; C08F8/00; C08F8/30; C08F8/32; D21H17/37; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A water-in-oil emulsion of an acrylamide-dimethylaminopropylacrylamide copolymer having been prepared by the steps comprising: A. forming a water-in-oil emulsion of an acrylamide-acrylonitrile copolymer, said water-in-oil emulsion containing: a. 5-60% by weight acrylamide-acrylonitrile copolymer containing 1-50% by weight acrylonitrile; b. 20-90% water; c. 5-75% of an inert hydrophobic organic liquid; and d. 0.1-21% water-in-oil emulsifying agent; B. reacting said water-in-oil emulsion of the acrylamide-acrylonitrile copolymer with dimethylamino-propylamine in a molar ratio of dimethylaminopropylamine to acrylonitrile of from 1:1 to 0.1:1; C. recovering a readily invertible water-in-oil emulsion of an acrylamide-dimethylaminopropyl acrylamide copolymer.
Claim 2
Dependent Claim
91 words
A water-in-oil emulsion of an acrylamide-dimethylaminopropylacrylamide copolymer having been prepared by the steps comprising: A. forming a water-in-oil emulsion of an acrylamide-acrylonitrile copolymer, said water-in-oil emulsion containing: a. 5-60% by weight acrylamide-acrylonitrile copolymer containing 1-50% by weight acrylonitrile; b. 20-90% water; c. 5-75% of an inert hydrophobic organic liquid; and d. 0.1-21% water-in-oil emulsifying agent; B. reacting said water-in-oil emulsion of the acrylamide-acrylonitrile copolymer with dimethylamino-propylamine in a molar ratio of dimethylaminopropylamine to acrylonitrile of from 1:1 to 0.1:1; C. recovering a readily invertible water-in-oil emulsion of an acrylamide-dimethylaminopropyl acrylamide copolymer.
Claim 3
Dependent Claim
27 words
The water-in-oil emulsion of an acrylamide:dimethylaminopropyl acrylamide copolymer of claim 1 wherein the dimethylaminopropylamine is reacted with the acrylamide:acrylonitrile copolymer at a temperature of from 20°-80° C.
Claim 4
Dependent Claim
50 words
The water-in-oil emulsion of an acrylamide-dimethylaminopropylacrylamide copolymer of claim 1 wherein the water-in-oil emulsion of the acrylamide:acrylonitrile copolymer contains, prior to reaction with dimethylaminopropylamine: A. 25-35% acrylamide-acrylonitrile copolymer, said copolymer containing 10-40% by weight acrylonitrile; B. 30-55% by weight water; C. 20-30% inert hydrophobic liquid; D. 1.2-10% water-in-oil emulsifying agent.
Claim 5
Dependent Claim
27 words
The water-in-oil emulsion of an acrylamide:dimethylaminopropylacrylamide copolymer of claim 1 wherein the acrylamide-acrylonitrile copolymer has a weight ratio of acrylamide to acrylonitrile of from 95:5 to 50:50.
Claim 6
Dependent Claim
21 words
The water-in-oil emulsion of acrylamide-dimethylaminopropyl acrylamide copolymer of claim 1, wherein said copolymer having a molecular weight of greater than 1,000,000.
Claim 7
Independent Claim
97 words
A method for the preparation of a water-in-oil emulsion of an acrylamide-dimethyl amino propyl acrylamide polymer comprising the steps of: A. forming a water-in-oil emulsion of an acrylamide-acrylonitrile copolymer, said water-in-oil emulsion containing: a. 5-60% by weight acrylamide-acrylonitrile copolymer containing 1-50% by weight acrylonitrile; b. 20-90% water; c. 5-75% of an inert hydrophobic organic liquid; and d. 0.1-21% water-in-oil emulsifying agent; B. reacting said water-in-oil emulsion of the acrylamide-acrylonitrile copolymer with dimethylamino-propylamine in a molar ratio of dimethylaminopropylamine to acrylonitrile of from 1:1 to 0.1:1; C. recovering a readily invertible water-in-oil emulsion of an acrylamide-dimethylaminopropyl acrylamide copolymer.
Claim 8
Independent Claim
97 words
A method for the preparation of a water-in-oil emulsion of an acrylamide-dimethyl amino propyl acrylamide polymer comprising the steps of: A. forming a water-in-oil emulsion of an acrylamide-acrylonitrile copolymer, said water-in-oil emulsion containing: a. 5-60% by weight acrylamide-acrylonitrile copolymer containing 1-50% by weight acrylonitrile; b. 20-90% water; c. 5-75% of an inert hydrophobic organic liquid; and d. 0.1-21% water-in-oil emulsifying agent; B. reacting said water-in-oil emulsion of the acrylamide-acrylonitrile copolymer with dimethylamino-propylamine in a molar ratio of dimethylaminopropylamine to acrylonitrile of from 1:1 to 0.1:1; C. recovering a readily invertible water-in-oil emulsion of an acrylamide-dimethylaminopropyl acrylamide copolymer.
Claim 9
Independent Claim
85 words
A method for the preparation of a water-in-oil emulsion of an acrylamide-dimethyl amino propyl acrylamide polymer comprising the steps of: A. Forming a water-in-oil emulsion of an acrylamide-acrylonitrile copolymer, said water-in-oil emulsion containing: a. 25-35% by weight acryamide-acrylonitrile copolymer containing 10-40% by weight acrylonitrile; b. 30-55% water; c. 20-30% of an inert hydrophobic organic liquid; and d. 1.2-10% water-in-oil emulsifying agent; B. reacting said water-in-oil emulsion of the acrylamide-acrylonitrile copolymer with dimethylamino-propylamine in a molar ratio of dimethylaminopropylamine to acrylonitrile of from 1:1 to 0.1:1.
Claim 10
Independent Claim
85 words
A method for the preparation of a water-in-oil emulsion of an acrylamide-dimethyl amino propyl acrylamide polymer comprising the steps of: A. Forming a water-in-oil emulsion of an acrylamide-acrylonitrile copolymer, said water-in-oil emulsion containing: a. 25-35% by weight acryamide-acrylonitrile copolymer containing 10-40% by weight acrylonitrile; b. 30-55% water; c. 20-30% of an inert hydrophobic organic liquid; and d. 1.2-10% water-in-oil emulsifying agent; B. reacting said water-in-oil emulsion of the acrylamide-acrylonitrile copolymer with dimethylamino-propylamine in a molar ratio of dimethylaminopropylamine to acrylonitrile of from 1:1 to 0.1:1.
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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |