US4426482A
Expired / Lapsed
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Process for producing stable polymer emulsions
Assignee: Tosoh Corp
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Filing: 1982-04-08
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Granted: 1984-01-17
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Expires: 2002-04-08
Abstract
Abstract An improved process for producing an aqueous polymer emulsion is provided wherein a radically polymerizable unsaturated monomer is polymerized in an aqueous medium in the presence of a water-soluble copolymer. The water-soluble copolymer is derived from a combination of (a) a nitrogen-containing ethylenically unsaturated compound with (b-1) an unsaturated carboxylic acid or its salt and/or (b-2) an ethylenically unsaturated sulfonic acid or its salt.
Inventors
- 👤 Kenichi Kuramoto
- 👤 Hideaki Nakazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:22
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F2/24; C08F2/26; C04; C04B; C04B26/00; C04B26/02; C04B26/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A process for producing an aqueous polymer emulsion wherein a radically polymerizable monomer or monomers having an unsaturated bond are polymerized in an aqueous medium in the presence of a water-soluble copolymer, said process comprising using as the water-soluble copolymer a copolymer derived from a combination of: (a) a nitrogen-containing compound having an ethylenically unsaturated bond represented by the formula (I) or (II): ##STR3## wherein X is a hydrogen atom or a methyl group and R is a hydrogen atom or a methylol group, with at least one compound selected from the group consisting of (b-1) an unsaturated carboxylic acid or its salt, and (b-2) an ethylenically unsaturated sulfonic acid or its salt.
Claim 2
Dependent Claim
113 words
A process for producing an aqueous polymer emulsion wherein a radically polymerizable monomer or monomers having an unsaturated bond are polymerized in an aqueous medium in the presence of a water-soluble copolymer, said process comprising using as the water-soluble copolymer a copolymer derived from a combination of: (a) a nitrogen-containing compound having an ethylenically unsaturated bond represented by the formula (I) or (II): ##STR3## wherein X is a hydrogen atom or a methyl group and R is a hydrogen atom or a methylol group, with at least one compound selected from the group consisting of (b-1) an unsaturated carboxylic acid or its salt, and (b-2) an ethylenically unsaturated sulfonic acid or its salt.
Claim 3
Dependent Claim
43 words
A process according to claim 1 wherein the water-soluble copolymer is derived from (a) 5 to 95% by weight of a nitrogen-containing compound having an ethylenically unsaturated bond with (b-1) 5 to 95% by weight of an unsaturated carboxylic acid or its salt.
Claim 4
Dependent Claim
28 words
A process according to claim 1 or 2 wherein the water-soluble copolymer is prepared by polymerization in an aqueous medium at a pH value of at least 3.
Claim 5
Dependent Claim
36 words
A process according to claim 1 or 2 wherein the water-soluble copolymer is prepared by polymerizing the monomers in an aqueous medium at a pH below 3 and then adding an alkali into the polymerization mixture.
Claim 6
Dependent Claim
45 words
A process according to claim 1 wherein the water-soluble copolymer is derived from (a) at least 40% by weight of a nitrogen-containing compound having an ethylenically unsaturated bond and (b-2) not more than 60% by weight of an ethylenically unsaturated sulfonic acid or its salt.
Claim 7
Dependent Claim
44 words
A process according to claim 1 wherein the water-soluble copolymer is derived from (a) 45 to 95% by weight of a nitrogen-containing compound having an ethylenically unsaturated bond and (b-2) 5 to 55% by weight of an ethylenically unsaturated sulfonic acid or its salt.
Claim 8
Dependent Claim
65 words
A process according to claim 1 wherein the water-soluble copolymer is a terpolymer derived from (a) 5 to 95% by weight of a nitrogen-containing compound having an ethylenically unsaturated bond, (b-1) more than 5% but less than 95% by weight of an unsaturated carboxylic acid or its salt and (b-2) not more than 60% by weight of an ethylenically unsaturated sulfonic acid or its salt.
Claim 9
Dependent Claim
37 words
A process according to claim 7 wherein the amount of the (b-2) ethylenically unsaturated sulfonic acid or its salt is from 5 to 55% by weight based on the total of the compounds (a), (b-1) and (b-2).
Claim 10
Dependent Claim
21 words
A process according to claim 1 wherein the water-soluble copolymer is prepared in an aqueous medium by using a redox initiator.
Claim 11
Dependent Claim
39 words
A process according to claim 1 wherein the amount of the water-soluble copolymer is in the range of from 0.1 to 10 parts by weight based on 100 parts by weight of the radically polymerizable unsaturated monomer or monomers.
Claim 12
Dependent Claim
23 words
A process according to any of claims 1, 2, 7 or 8 wherein the unsaturated carboxylic acid has 3 to 8 carbon atoms.
Claim 13
Dependent Claim
25 words
A process according to any of claims 1, 5, 6, 7 or 8 wherein the ethylenically unsaturated sulfonic acid has 2 to 8 carbon atoms.
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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |