Patent US3909473A successfully refreshed from Google Patents.
US3909473A
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US
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Cis-1,4-polyisoprene rubber composition having improved mechanical properties
Assignee: Kuraray Co Ltd
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Filing: 1973-11-30
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Granted: 1975-09-30
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Expires: 1993-11-30
Abstract
Abstract The mechanical properties of an unvulcanized rubber composition having, as the rubber material, maleinized polyisoprene rubber which contains zinc oxide as one of the compounding ingredients can be markedly increased by the addition of an oxide or a hydroxide of a metal belonging to Groups IA, IIA and IVB of the Periodic Table.
Inventors
- 👤 Takayuki Okamura
- 👤 Shobu Minatono
- 👤 Junnosuke Yamauchi
- 👤 Kazuhisa Yamauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:23
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
AN UNVULCANIZED RUBBER COMPOSITION HAVING A HIGH GREEN STRENGTH AND BEING USEFUL FOR THE PREPARATION OF A VULCANIZATE, SAID COMPOSITION COMPRISING A MODIFIED CIS-1,4-POLYISOPRENE RUBBER HAVING A BOUND MALEIC ANHYDRIDE CONTENT OF FROM 0.03 TO 2.5 MOLES PER 100 RECURRING UNITS OF ISOPRENE NONOMER IN THE RUBBER POLYMER, AND RUBBER COMPOUNDING INGREDIENTS CONTAINING SULFUR AS A VULCANIZING AGENT FOR SAID RUBBER, 0.5 TO 3.0 PARTS BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF SAID RUBBER, OF A HYDROXIDE OF A METAL BELONGING TO GROUP II A OF THE PERIODIC TABLE, 2 TO 8 PARTS BY WEIGHT OF ZINC OXIDE BASED ON 100 PARTS BY WEIGHT OF SAID RUBBER AND STEARIC ACID IN AN EFFECTIVE FOR THE CONTROL OF SCORCH.
Claim 2
Dependent Claim
120 words
AN UNVULCANIZED RUBBER COMPOSITION HAVING A HIGH GREEN STRENGTH AND BEING USEFUL FOR THE PREPARATION OF A VULCANIZATE, SAID COMPOSITION COMPRISING A MODIFIED CIS-1,4-POLYISOPRENE RUBBER HAVING A BOUND MALEIC ANHYDRIDE CONTENT OF FROM 0.03 TO 2.5 MOLES PER 100 RECURRING UNITS OF ISOPRENE NONOMER IN THE RUBBER POLYMER, AND RUBBER COMPOUNDING INGREDIENTS CONTAINING SULFUR AS A VULCANIZING AGENT FOR SAID RUBBER, 0.5 TO 3.0 PARTS BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF SAID RUBBER, OF A HYDROXIDE OF A METAL BELONGING TO GROUP II A OF THE PERIODIC TABLE, 2 TO 8 PARTS BY WEIGHT OF ZINC OXIDE BASED ON 100 PARTS BY WEIGHT OF SAID RUBBER AND STEARIC ACID IN AN EFFECTIVE FOR THE CONTROL OF SCORCH.
Claim 3
Dependent Claim
16 words
The composition of claim 1, wherein said rubber has a cis-1,4 content of at least 80%.
Claim 4
Dependent Claim
22 words
The composition of claim 1, further consisting essentially of rubber compounding ingredients including vulcanization accelerators, fillers, extenders or antioxidants or mixtures thereof.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |