Patent US3920599A successfully refreshed from Google Patents.
US3920599A
Expired / Lapsed
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Latices of dially dimethyl ammonium chloride/acrylamide polymers
Assignee: ChampionX LLC
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Filing: 1974-03-29
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Granted: 1975-11-18
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Expires: 1994-03-29
Abstract
Abstract The preparation of homopolymers of diallyl dimethyl ammonium chloride (DADMAC) and copolymers thereof with acrylamide utilizing a water-in-oil emulsion polymerization technique to produce extremely stable polymer latices and subsequently inverting these emulsions in water, preferably with a suitable hydrophilic and water-soluble surfactant.
Inventors
- 👤 John R Hurlock
- 👤 Edward G Ballweber
- 👤 Lawrence J Connelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:37
CPC Classifications
C; C08; C08F; C08F26/00; C08F26/02; C08F26/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
140 words
A STABLE WATER-IN-OIL POLYMER EULSION SELECTED FROM THE GROUP CONSISTING OF A DIALLYL DIMETHYL AMMONIUM CHLORIDE HOMOPOLYMER AND COPOLYMERS OF DIALLYL DIMETHYL AMMINUM CHLORIDE CHLORIDE/ACRYLAMIDE PREPARED BY A METHOD WHICH COMPRISES (A) PREPARING A WATER-IN-OIL MONOMER EMULSION, (B) POLYMERIZING WITH AGITATION IN THE PRESENCE OF A LOW HLB EMULSIFIER AND A FREE RADICAL INITIATOR AT A TEMPERATURE OF 75*-90*C FOR A PERIOD OF ABOUT 6-7 HOURS TO PRODUCE THE WATER-IN-OIL POLYMER EMULSION, AND (C) RECOVERING SAID POLYMER WITH A LATEX BROOKFIELD VISCOSITY OF ABOUT 300-5000 CPS AND AN INTRINSIC VISCOSITY OF ABOUT 0.50-1.00 AND WHEREIN THE CONCENTRATION OF THE POLYMER LIES BETWEEN 20-50% BY WEIGHT OF THE EMULSION AND THE PARTICLE SIZE IS WITHIN THE RANGE OF 5UU TO 5U, SAID POLYMER EMULSION BEING CHARACTERIZED BY RAPID INVERSION IN WATER TO A SOLUTION IN THE PRESENCE OF A HYDROPHILIC SURFACTANT.
Claim 2
Dependent Claim
140 words
A STABLE WATER-IN-OIL POLYMER EULSION SELECTED FROM THE GROUP CONSISTING OF A DIALLYL DIMETHYL AMMONIUM CHLORIDE HOMOPOLYMER AND COPOLYMERS OF DIALLYL DIMETHYL AMMINUM CHLORIDE CHLORIDE/ACRYLAMIDE PREPARED BY A METHOD WHICH COMPRISES (A) PREPARING A WATER-IN-OIL MONOMER EMULSION, (B) POLYMERIZING WITH AGITATION IN THE PRESENCE OF A LOW HLB EMULSIFIER AND A FREE RADICAL INITIATOR AT A TEMPERATURE OF 75*-90*C FOR A PERIOD OF ABOUT 6-7 HOURS TO PRODUCE THE WATER-IN-OIL POLYMER EMULSION, AND (C) RECOVERING SAID POLYMER WITH A LATEX BROOKFIELD VISCOSITY OF ABOUT 300-5000 CPS AND AN INTRINSIC VISCOSITY OF ABOUT 0.50-1.00 AND WHEREIN THE CONCENTRATION OF THE POLYMER LIES BETWEEN 20-50% BY WEIGHT OF THE EMULSION AND THE PARTICLE SIZE IS WITHIN THE RANGE OF 5UU TO 5U, SAID POLYMER EMULSION BEING CHARACTERIZED BY RAPID INVERSION IN WATER TO A SOLUTION IN THE PRESENCE OF A HYDROPHILIC SURFACTANT.
Claim 3
Dependent Claim
32 words
The emulsion of claim 1 wherein during the polymerization of the monomer emulsion (a), the heating is carried out at 75*-77*C for about 4 hours and 85*-87*C for an additional 2 hours.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |