Patent US4208490A successfully refreshed from Google Patents.
US4208490A
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Process for preparing polymer resins
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1977-10-25
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Granted: 1980-06-17
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Expires: 1997-10-25
Abstract
Abstract A process for preparing polymer resins by polymerization of at least one ethylenic monomer onto at least one rubbery polymer optionally grafted with at least one ethylenic monomer which comprises initiating the polymerization in an emulsion system, adding a suspension stabilizer to the polymerization system at the stage after the conversion of the ethylenic monomer to be polymerized reaches 5% by weight and before the emulsion system is broken and then continuing the polymerization in a suspension system until completion of the polymerization. By the process, polymer resins can be produced in particles having a beautiful appearance and an even particle size with a narrow range of particle size distribution.
Inventors
- 👤 Masatsune Kondo
- 👤 Akira Tanoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:12
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A process for preparing polymer resins by polymerization of at least one ethylenic monomer onto at least one rubbery polymer optionally grafted with at least one ethylenic monomer which consists essentially of initiating the polymerization in an emulsion system free of a suspension, stabilizer adding a suspension stabilizer to the polymerization system at the stage after the conversion of the ethylenic monomer to be polymerized reaches 5% by weight and before the emulsion system is broken and then continuing the polymerization in a suspension system until completion of the polymerization.
Claim 2
Dependent Claim
90 words
A process for preparing polymer resins by polymerization of at least one ethylenic monomer onto at least one rubbery polymer optionally grafted with at least one ethylenic monomer which consists essentially of initiating the polymerization in an emulsion system free of a suspension, stabilizer adding a suspension stabilizer to the polymerization system at the stage after the conversion of the ethylenic monomer to be polymerized reaches 5% by weight and before the emulsion system is broken and then continuing the polymerization in a suspension system until completion of the polymerization.
Claim 3
Dependent Claim
36 words
The process according to claim 1, wherein the suspension stabilizer is a member selected from the group consisting of fine powders of inorganic compounds hardly soluble in water and natural or synthetic water-soluble high polymeric materials.
Claim 4
Dependent Claim
39 words
The process according to claim 2, wherein the suspension stabilizer is a member selected from the group consisting of magnesium carbonate, calcium tertiary phosphate, starch, gelatin, partially saponified polyvinyl alcohol, polyvinylpyrrolidone, methyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
Claim 5
Dependent Claim
33 words
The process according to claim 1, wherein the suspension stabilizer is used in an amount of 0.02 to 1.0 part by weight to 100 parts by weight of water in the polymerization system.
Claim 6
Dependent Claim
86 words
The process according to claim 1, wherein the rubbery polymer optionally grafted with at least one ethylenic monomer is a member selected from the group consisting of natural rubber, butadiene rubber, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, isoprene rubber, chloroprene rubber, acrylic rubber, ehtylene-propylene-diene terpolymer and ethylene-vinyl acetate copolymer and their graft copolymers with at least one of styrenic monomers, acrylonitrile and its related compounds, acrylic acid and its esters, methacrylic acid and its esters, vinyl esters, vinyl and vinylidene halides, vinylketone, acrylamide, vinylpyrrolidone, maleic anhydride and maleimide.
Claim 7
Dependent Claim
64 words
The process according to claim 1, wherein the ethylenic monomer to be polymerized onto the rubbery polymer optionally grafted with at least one ethylenic monomer is a member selected from the group consisting of styrenic monomers, acrylonitrile and its related compounds, acrylic acid and its esters, methacrylic acid and its esters, vinyl esters, vinyl and vinylidene halides, vinylketone, acrylamide, vinylpyrrolidone, maleic anhydride and maleimide.
Claim 8
Dependent Claim
45 words
The process according to claim 1, wherein the ethylenic monomer and the rubbery polymer optionally grafted with at least one ethylenic monomer is used in such a proportion as to make a rubber content of 3 to 60% by weight in the produced polymer resin.
Claim 9
Dependent Claim
19 words
The process according to claim 1, wherein the polymerization is carried out in the presence of a polymerization initiator.
Claim 10
Dependent Claim
20 words
The process according to claim 1, wherein the polymerization is carried out in the presence of a chain transfer agent.
Claim 11
Dependent Claim
20 words
The process according to claim 1, wherein the polymerization is carried out at a temperature from 50° to 140° C.
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) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |