US4002589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of water soluble segmented polymers
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1975-01-13
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Granted: 1977-01-11
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Expires: 1995-01-13
Abstract
Abstract Water-soluble segmented polymers of the <IMAGE> A-B-A, and (A-B)n types wherein the A-segments are grafted homopolymer, copolymer and/or terpolymer segments of water-soluble vinyl monomers, and the B-segments are homopolymer segments of poly(vinyl pyrrolidone) or poly(vinyl alcohol), are prepared by a process employing inverse emulsion techniques and cerium (IV) salt initiators.
Inventors
- 👤 David E. Farley
- 👤 Janice Elaine Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:38
CPC Classifications
C; C08; C08F; C08F271/00; C08F271/02; C08F261/00; C08F261/02; C08F261/04; C08F293/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A method of preparing segmented polymers comprised of segments selected from homopolymers, copolymers and terpolymers of water-soluble vinyl monomers, and segments selected from poly(vinyl pyrrolidone) or poly(vinyl alcohol), which comprises the step of: reacting, at a pH below 7.0, in an inverse emulsion environment which includes at least 4% by weight of the total system of one or more non-ionic surfactants having an HLB number of from about 7.0 to about 10.0, and in the presence of a cerium (IV) salt initiator, one or more water-soluble vinyl monomers and poly(vinyl pyrrolidone) or poly(vinyl alcohol).
Claim 2
Independent Claim
94 words
A method of preparing segmented polymers comprised of segments selected from homopolymers, copolymers and terpolymers of water-soluble vinyl monomers, and segments selected from poly(vinyl pyrrolidone) or poly(vinyl alcohol), which comprises the step of: reacting, at a pH below 7.0, in an inverse emulsion environment which includes at least 4% by weight of the total system of one or more non-ionic surfactants having an HLB number of from about 7.0 to about 10.0, and in the presence of a cerium (IV) salt initiator, one or more water-soluble vinyl monomers and poly(vinyl pyrrolidone) or poly(vinyl alcohol).
Claim 3
Dependent Claim
40 words
The method of claim 1 wherein the water-soluble vinyl monomers are selected from the group consisting of 3-acrylamido-3-methyl butyl trimethyl ammonium chloride, 2-acrylamido-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium methosulfate, and acrylamide.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the reactants are poly(vinyl pyrrolidone) and acrylamide.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the cerium (IV) salt is ammonium cerium nitrate.
Claim 6
Independent Claim
99 words
A method of preparing an inverse emulsion of poly(vinyl pyrrolidone)-block-acrylamide comprising the steps: dissolving in the water phase of the inverse emulsion, or a portion thereof, poly(vinyl pyrrolidone) and acrylamide monomer; mixing the thus prepared water phase solution portion or portions with the oil phase of the inverse emulsion comprising a relatively inert hydrophobic liquid and at least 4% by weight of the total system of one or more non-ionic surfactants having an HLB number of from about 7.0 to about 10.0; adding to the above mixture, maintained at a pH below 7.0, a cerium (IV) salt polymerization initiator.
Claim 7
Independent Claim
99 words
A method of preparing an inverse emulsion of poly(vinyl pyrrolidone)-block-acrylamide comprising the steps: dissolving in the water phase of the inverse emulsion, or a portion thereof, poly(vinyl pyrrolidone) and acrylamide monomer; mixing the thus prepared water phase solution portion or portions with the oil phase of the inverse emulsion comprising a relatively inert hydrophobic liquid and at least 4% by weight of the total system of one or more non-ionic surfactants having an HLB number of from about 7.0 to about 10.0; adding to the above mixture, maintained at a pH below 7.0, a cerium (IV) salt polymerization initiator.
Claim 8
Dependent Claim
17 words
The method of claim 5 wherein the non-ionic surfactants are polyoxyethylene 40 sorbitol hexaoleate and sorbitan sesquioleate.
Claim 9
Dependent Claim
14 words
The method of claim 6 wherein the cerium (IV) salt is ammonium cerium nitrate.
Claim 10
Dependent Claim
13 words
An inverse emulsion of segmented polymers produced by the process of claim 1.
Claim 11
Dependent Claim
13 words
An inverse emulsion of poly(vinyl pyrrolidone)-block-acrylamide produced by the process of claim 5.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |