US4164612A
Expired / Lapsed
US
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Process for producing water-soluble cationic polymers
Assignee: Mitsubishi Chemical Corp
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Filing: 1977-10-31
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Granted: 1979-08-14
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Expires: 1997-10-31
Abstract
Abstract In a process for producing a water-soluble polymer in an easily grindable glassy state by subjecting to aqueous solution polymerization a mixture comprising a monomer composed mainly of a vinyl monomer represented by the general formula (I): <IMAGE> (I) and water in an amount of 7 to 18% by weight based on the total weight of the monomer and water, a water-soluble salt in a powdery form is added to and dispersed in the polymerization system and the polymerization is carried out in the state that the powdery salt is dispersed, whereby a water-soluble polymer excellent in flocculating action and dissolving workability is obtained.
Inventors
- 👤 Naoyuki Suzuki
- 👤 Yoji Wada
- 👤 Akihisa Furuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:27
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34; Y; Y10; Y10S; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
224 words
A process for producing a cationic polymer, which comprises subjecting to aqueous solution polymerization a vinyl monomer represented by the formula, ##STR4## wherein R 1 represents --H or --CH 3 ; R 2 represents --CH 2 CH 2 -- or --CH 2 CH(OH)CH 2 --; R 3 and R 4 represent --CH 3 or --CH 2 CH 3 ; R 5 represents --C n H 2n+1 in which n is an integer from 0 to 4, --CH 2 C 6 H 5 or --CH 2 COOH; and X - represents Cl - , CH 3 SO 4 - , CH 3 SO 3 - or 1/2SO 4 -- , either alone or in admixture with up to 25% by weight, based on the total weight of the monomers, of other polymerizable vinyl monomers by use of a polymerization initiator in the presence of 7 to 18% by weight, based on the total weight of the monomer and water, of water and about 10 to about 40% by weight, based on the total weight of the polymerization system, of a powdery water-soluble salt selected from the group consisting of alkali metal salts, alkaline earth metal salts and ammonium salts which is dispersed in the polymerization system, in the absence of other media, thereby obtaining the water-soluble cationic polymer in the form of a solid mass.
Claim 2
Dependent Claim
224 words
A process for producing a cationic polymer, which comprises subjecting to aqueous solution polymerization a vinyl monomer represented by the formula, ##STR4## wherein R 1 represents --H or --CH 3 ; R 2 represents --CH 2 CH 2 -- or --CH 2 CH(OH)CH 2 --; R 3 and R 4 represent --CH 3 or --CH 2 CH 3 ; R 5 represents --C n H 2n+1 in which n is an integer from 0 to 4, --CH 2 C 6 H 5 or --CH 2 COOH; and X - represents Cl - , CH 3 SO 4 - , CH 3 SO 3 - or 1/2SO 4 -- , either alone or in admixture with up to 25% by weight, based on the total weight of the monomers, of other polymerizable vinyl monomers by use of a polymerization initiator in the presence of 7 to 18% by weight, based on the total weight of the monomer and water, of water and about 10 to about 40% by weight, based on the total weight of the polymerization system, of a powdery water-soluble salt selected from the group consisting of alkali metal salts, alkaline earth metal salts and ammonium salts which is dispersed in the polymerization system, in the absence of other media, thereby obtaining the water-soluble cationic polymer in the form of a solid mass.
Claim 3
Dependent Claim
38 words
A process according to claim 1, wherein the water-soluble cationic polymer in the form of a solid mass is further ripened at a temperature of 70° to 150° C. for a period of about 3 minutes or more.
Claim 4
Dependent Claim
37 words
A process according to claim 1, wherein the water-soluble polymer in the form of a solid mass is further ripened at a temperature of 100° to 150° C. for a period of about 3 minutes or more.
Claim 5
Dependent Claim
48 words
A process according to claim 1, wherein the vinyl compound represented by the general formula (I) is selected from the group consisting of sulfates, hydrochlorides, di-lower-alkylsulfates, lower-alkyl chloride-quaternized salts, chloracetate and benzyl chloride-quaternized salts of dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, dimethylaminohydroxypropyl acrylate, dimethylaminohydroxypropyl methacrylate, diethylaminohydroxypropyl acrylate and diethylaminohydroxypropyl methacrylate.
Claim 6
Dependent Claim
61 words
A process according to claim 1, wherein the said other copolymerizable vinyl monomers are at least one monomer selected from the group consisting of acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, vinyl acetate, vinylpyridine and 2-methylvinylpyridine, and are used in an amount of 25% by weight or less based on the total weight of the monomers.
Claim 7
Dependent Claim
52 words
A process according to claim 1, wherein the water-soluble salt is selected from the group consisting of sodium chloride, potassium chloride, lithium chloride, sodium sulfate anhydride, potassium sulfate, potassium dihydrogenphosphate, sodium acetate, potassium acetate, calcium chloride anhydride, magnesium chloride anhydride, magnesium sulfate anhydride, ammonium chloride, ammonium sulfate, ammonium dihydrogenphosphate and ammonium acetate.
Claim 8
Dependent Claim
20 words
A process according to claim 1, wherein the pH of the polymerization system is adjusted to about 2 to 9.5.
Claim 9
Dependent Claim
20 words
A process according to claim 1, wherein the polymerization is carried out in a bag made of a polyester film.
Claim 10
Dependent Claim
15 words
A process according to claim 1 wherein the vinyl monomer of formula (I) is homopolymerized.
Claim 11
Dependent Claim
17 words
A process according to claim 1 wherein the water soluble salt is sodium chloride or sodium sulfate.
References Cited (Backward Citations)
US3405106A
Cited
US3661880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |