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US4376850A
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Aqueous phase polymerization of water miscible monomers
Assignee: Dow Chemical Co
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Filing: 1981-05-18
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Granted: 1983-03-15
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Expires: 2001-05-18
Abstract
Abstract Water miscible monomers such as acrylamide are polymerized in an aqueous phase in the presence of an initiator containing a borohydride such as sodium borohydride and an easily reduced metal ion such as cupric ion.
Inventors
- 👤 James W. Sanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:00
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/42; C08F4/44; C08F4/52; C08F2/00; C08F2/04; C08F2/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
65 words
A process for polymerizing water miscible monomers which process comprises (1) contacting an aqueous phase containing a water miscible monomer with an initiating amount of an initiator containing a metal borohydride and a metal ion that can be reduced by the borohydride and (2) subjecting the resulting aqueous phase to conditions of aqueous phase polymerization sufficient to polymerize the monomer to form a water-soluble polymer.
Claim 2
Dependent Claim
65 words
A process for polymerizing water miscible monomers which process comprises (1) contacting an aqueous phase containing a water miscible monomer with an initiating amount of an initiator containing a metal borohydride and a metal ion that can be reduced by the borohydride and (2) subjecting the resulting aqueous phase to conditions of aqueous phase polymerization sufficient to polymerize the monomer to form a water-soluble polymer.
Claim 3
Dependent Claim
50 words
The process of claim 1 wherein the initiator is a redox initiator containing a free radical generating oxidizing agent, a metal borohydride and a metal ion that can be reduced by the borohydride to an oxidation state from which the reduced metal ion can be oxidized by the oxidizing agent.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein the metal borohydride is an alkali metal borohydride.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein the alkali metal is sodium.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein the metal ion is cupric ion.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the monomer is acrylamide or a mixture of acrylamide and at least one other water miscible monomer.
Claim 8
Dependent Claim
20 words
The process of claim 5 wherein the monomer is acrylamide, acrylic acid or a mixture containing acrylamide and acrylic acid.
Claim 9
Dependent Claim
19 words
The process of claim 5 or 6 wherein the aqueous phase is the disperse phase of a water-in-oil emulsion.
Claim 10
Dependent Claim
16 words
The process of claim 8 wherein the oxidizing agent is a free radical generating peroxygen compound.
Claim 11
Dependent Claim
15 words
The process of claim 9 wherein the peroxygen compound is an organic peroxide or hydroperoxide.
Claim 12
Dependent Claim
12 words
The process of claim 9 wherein the peroxygen compound is t-butyl hydroperoxide.
Claim 13
Dependent Claim
17 words
The process of claim 6 wherein the other water miscible monomer is an N-(sulfoalkylacrylamide) or an N-(sulfoalkyl)methacrylamide.
Claim 14
Dependent Claim
12 words
The process of claim 12 wherein the water miscible monomer is N-(2-sulfo-1,1-dimethylethyl)acrylamide.
Claim 15
Dependent Claim
17 words
The process of claim 6 wherein the other water miscible monomer is a diallyl quaternary ammonium compound.
Claim 16
Dependent Claim
16 words
The process of claim 14 wherein the diallyl quaternary ammonium compound is dimethyl diallyl ammonium chloride.
Claim 17
Dependent Claim
20 words
The process of claim 6 wherein the water miscible monomer is 2-acryloylethyl trimethyl ammonium chloride or 2-methacryloylethyl trimethyl ammonium chloride.
Claim 18
Dependent Claim
16 words
The process of claim 6 wherein the other water miscible monomer is 3-(methacrylamido)propyl trimethyl ammonium chloride.
References Cited (Backward Citations)
US2728757A
Cited
GB835674A
Cited
US2963459A
Cited
US3255168A
Cited
US3275611A
Cited
US3332922A
Cited
US3396154A
Cited
GB1123723A
Cited
US4145495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |