US3671610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked graft copolymer of styrene and methyl methacrylate upon a butadiene polymer
Assignee: Kureha Corp
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Filing: 1969-11-14
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Granted: 1972-06-20
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Expires: 1989-11-14
Abstract
Abstract Butadiene-styrene-methyl methacrylate copolymers prepared by graft-polymerization with cross-linked butadiene or polybutadiene-styrene copolymer latex of styrene-methyl methacrylate monomers and a cross-linking agent capable of copolymerizing with said monomers in two steps. Polyvinyl chloride resins incorporated with the graft copolymer exhibits improved mechanical strength and other physical properties.
Inventors
- 👤 Yasuo Amagi
- 👤 Masaki Ohya
- 👤 Zenya Shiiki
- 👤 Haruhiko Yusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; C; C08; C08F; C08F279/00; C08F279/02; C08F279/06; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
the remainder portion of which is added singly to the latex in the second stage graft-polymerization, when a greater part of the first polymerization step is completed,
Claim 2
Dependent Claim
33 words
The process according to claim 1, wherein the cross-linking agent is one selected from the group consisting of divinyl benzene, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetra-ethylene glycol dimethacrylate, and 1,3-butylene glycol dimethacrylate.
Claim 3
Dependent Claim
46 words
the quantity of said cross-linking agent being in the range of from 0.01 to 5 percent by weight of the total quantity of the monomers existing in the copolymer and being present in each monomer portion; and c. reacting the mixture to form said graft copolymer.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |