US3755160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for flocculating using a poly(quaternary ammonium)polyether polyelectrolyte
Assignee: Covestro International SA
•
Filing: 1971-09-29
•
Granted: 1973-08-28
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Expires: 1991-09-29
Abstract
Abstract Water-soluble poly(quaternary ammonium) polyether polyelectrolyte salts containing quaternary nitrogen atoms in the polymer backbone and chain-extended by ether groups are prepared by treating the polymeric reaction product from an N,N,N'',N''tetraalkyl-hydroxy substituted diamine and an organic dihalide such as a dihaloalkane or a dihalo ether with an epoxyhaloalkane. These polyelectrolytes are used in processes for flocculating particles dispersed in aqueous media, for example, white water clarification, clay flocculation, sewage treatment, and wet-end addition, by adding the polyelectrolyte to the aqueous media in amounts sufficient to flocculate the dispersed particles.
Inventors
- 👤 E Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:39
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/0226; C02; C02F; C02F1/00; C02F1/52; C02F1/54; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
27 words
The process of claim 1 in which the polyelectrolyte salt comprises the reaction product between a poly(quaternary ammonium salt) having a repeating unit of the generalized formula:
Claim 2
Dependent Claim
23 words
The process of claim 2 in which the epoxyhaloalkane is selected from the group consisting of epichlorohydrin; 1-bRomo-2, 3-epoxypropane; 1-chloro-3,4-epoxybutane; 2-chloro-5,6-epoxyhexane; and 1,2-epoxy-6-iodohexane.
Claim 3
Dependent Claim
31 words
The process of claim 1 in which the polyelectrolyte salt comprises the reaction product of a poly(quaternary ammonium) salt which is the reaction product from a tetraalkylhydroxyalkylenediamine having the general formula:
Claim 4
Dependent Claim
36 words
The process of claim 4 in which R is a methyl group, R'' is a methylidyne group, R'''' is an ethyleneoxyethylene group A is chloride, the epoxyhaloalkane is epichlorohydrin, and the alkaline agent is sodium hydroxide.
Claim 5
Dependent Claim
12 words
The process of claim 1 in which said particles are inorganic material.
Claim 6
Dependent Claim
12 words
The process of claim 1 in which said particles are organic materials.
Claim 7
Dependent Claim
17 words
The process of claim 1 in which said aqueous medium is a pigment-containing slurry of paper-making fibers.
Claim 8
Dependent Claim
17 words
The process of claim 1 in which said finely divided particles in said aqueous medium are clay.
Claim 9
Dependent Claim
12 words
The process of claim 1 in which said aqueous medium is sewage.
Claim 10
Dependent Claim
14 words
The process of claim 1 in which said aqueous medium is a polymer latex.
Claim 11
Dependent Claim
18 words
The process of claim 1 in which said aqueous medium is white water effluent from a paper-making operation.
References Cited (Backward Citations)
US2995512A
Cited
US3219578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |