US4041006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flocculant composition and process
Assignee: Rohm and Haas Co
•
Filing: 1975-10-29
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Granted: 1977-08-09
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Expires: 1995-10-29
Abstract
Abstract Oil-dispersed poly(vinylimidazoline) and poly(2-vinylimidazolinium) bisulfate flocculant compositions and process for in situ preparation of same.
Inventors
- 👤 Ronald A. Fong
- 👤 James A. Latty
- 👤 Roger P. McDonnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:39
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C02; C02F; C02F1/00; C02F1/52; C02F1/5227; C02F1/54; C08F8/44; Y; Y10; Y10S; Y10S524/00; Y10S524/922
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
126 words
A process for the in situ preparation of a vinylimidazoline polymer composition dispersed in an inert oil comprising: a. reacting polyacrylonitrile with ethylene diamine in mol ratios of at least about 1:1 in a volatile solvent medium containing an organic or inorganic sulfide catalyst capable of generating at least trace amounts of hydrogen sulfide while retaining the reaction medium at a temperature between 40° C. and 100° C. and under a dry inert atmosphere to produce poly(vinylimidazoline) and continuously purging off the by-product gaseous ammonia; and b. distilling off excess unreacted ethylene diamine and volatile solvent under reduced pressure while concurrently adding an inert oil in an amount sufficient to yield a dispersion in which the concentration is poly(vinylimidazoline) in oil of not greater than 65%.
Claim 2
Dependent Claim
126 words
A process for the in situ preparation of a vinylimidazoline polymer composition dispersed in an inert oil comprising: a. reacting polyacrylonitrile with ethylene diamine in mol ratios of at least about 1:1 in a volatile solvent medium containing an organic or inorganic sulfide catalyst capable of generating at least trace amounts of hydrogen sulfide while retaining the reaction medium at a temperature between 40° C. and 100° C. and under a dry inert atmosphere to produce poly(vinylimidazoline) and continuously purging off the by-product gaseous ammonia; and b. distilling off excess unreacted ethylene diamine and volatile solvent under reduced pressure while concurrently adding an inert oil in an amount sufficient to yield a dispersion in which the concentration is poly(vinylimidazoline) in oil of not greater than 65%.
Claim 3
Dependent Claim
66 words
The process of claim 1 wherein a cosolvent is added to the dispersion of poly(vinylimidazoline) in oil and the poly(vinylimidazoline) is contacted with sulfuric acid in mole ratios of 1:1 to 1:10 based on monomer units of the poly(vinylimidazoline) at a temperature between 0° C. and 75° C. to form a poly(2-vinylimidazolinium) bisulfate dispersion which is thereafter stripped of cosolvent to yield an oil-dispersed flocculant product.
Claim 4
Dependent Claim
24 words
A process as claimed in claim 1 wherein the imidazolation reaction is conducted at a temperature between about 50° C. and about 85° C.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1 wherein the imidazolation reaction is conducted in the presence of a catalytic amount of carbon disulfide.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 2 wherein the neutralization reaction of poly(vinylimidazoline) with sulfuric acid is conducted at a temperature of between 15° C. and 50° C.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 1 wherein the imidazolation reaction is conducted with acrylonitrile polymer and ethylene diamine present in mole ratios of about 1:2.
Claim 8
Dependent Claim
24 words
A process as claimed in claim 2 wherein the neutralization reaction is conducted using poly(vinylimidazoline) and sulfuric acid in mole ratios of about 1:1.2.
Claim 9
Dependent Claim
34 words
A process as claimed in claim 2 wherein the amount of inert oil added before the neutralization reaction is that necessary to yield a final dispersion comprising between 45% and 50% of poly(2-vinylimidazolinium) bisulfate.
Claim 10
Dependent Claim
18 words
A liquid flocculant concentrate comprising up to about 50% by weight of poly(vinylimidazoline) dispersed in an inert oil.
Claim 11
Dependent Claim
18 words
A liquid flocculant concentrate comprising up to about 50% by weight of poly(vinylimidazoline) dispersed in an inert oil.
Claim 12
Dependent Claim
29 words
A liquid flocculant composition comprising up to about 65% by weight of poly(2-vinylimidazolinium) bisulfate dispersed in an inert oil, when produced in accordance with the process of claim 2.
Claim 13
Dependent Claim
52 words
A liquid flocculant composition when prepared in accordance with the process of claim 2 and containing the following ingredients in the indicated proportions: ______________________________________
poly (2-vinylimidazolinium) bisulfate
45 - 50%
450 neutral oil 45 - 50%
residual toluene = 0.25%
residual ethyl acetate = 0.25%
surfactant and dispersant 3 - 5%
______________________________________
Claim 14
Dependent Claim
46 words
A liquid flocculant concentrate containing poly(vinylimidazoline) and an inert oil which may be readily converted to bisulfate salt form by addition to an acidic aqueous solution containing between 0.5 and 1.5 moles of sulfuric acid per mole of poly(vinylimidazoline) based on monomer units of the poly(vinylimidazoline).
Claim 15
Dependent Claim
46 words
A liquid flocculant concentrate containing poly(vinylimidazoline) and an inert oil which may be readily converted to bisulfate salt form by addition to an acidic aqueous solution containing between 0.5 and 1.5 moles of sulfuric acid per mole of poly(vinylimidazoline) based on monomer units of the poly(vinylimidazoline).
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |