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US4510303A
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Ethylene-alpha-olefin-polyene random copolymer rubber
Assignee: Mitsui Chemicals Inc
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Filing: 1983-05-06
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Granted: 1985-04-09
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Expires: 2003-05-06
Abstract
Abstract An ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms and a polyene, wherein (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5, (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1, (C) an iodine value of the copolymer rubber is 2 to 40, (D) an intrinsic viscosity [ eta ] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135 DEG C., and (E) g eta * defined by a ratio of the intrinsic viscosity [ eta ] to an intrinsic viscosity [ eta ]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.9. Also a process for preparing this random copolymer rubber and vulcanizate derived from the same are also disclosed. This random copolymer rubber has an excellent extrudability and a fast cure rate and provides a vulcanizate having high tensile strength.
Inventors
- 👤 Hidekuni Oda
- 👤 Syuji Minami
- 👤 Hiroshi Inoue
- 👤 Akira Matsuda
- 👤 Yohzoh Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:18
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; C08F210/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
Ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms, and a polyene, wherein: (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5; (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1; (C) an iodine value of the copolymer rubber is 2 to 40; (D) an intrinsic viscosity [η] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135° C.; and (E) g.sub.η * defined by a ratio of the intrinsic viscosity [η] to an intrinsic viscosity [η]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.8.
Claim 2
Dependent Claim
135 words
Ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms, and a polyene, wherein: (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5; (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1; (C) an iodine value of the copolymer rubber is 2 to 40; (D) an intrinsic viscosity [η] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135° C.; and (E) g.sub.η * defined by a ratio of the intrinsic viscosity [η] to an intrinsic viscosity [η]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.8.
Claim 3
Dependent Claim
33 words
Ethylene-alpha-olefin-polyene random copolymer rubber as claimed in claim 1, wherein a Q value defined by a ratio the weight-average molecular weight number-average molecular weight of the copolymer rubber is not more than 6.
Claim 4
Dependent Claim
137 words
Vulcanizate of ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms and a polyene, wherein: (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5; (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1; (C) an iodine value of the copolymer rubber is 2 to 40; (D) an intrinsic viscosity [η] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135° C.; and (E) g.sub.η * defined by a ratio of the intrinsic viscosity [η] to an intrinsic viscosity [η]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.8.
Claim 5
Dependent Claim
137 words
Vulcanizate of ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms and a polyene, wherein: (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5; (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1; (C) an iodine value of the copolymer rubber is 2 to 40; (D) an intrinsic viscosity [η] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135° C.; and (E) g.sub.η * defined by a ratio of the intrinsic viscosity [η] to an intrinsic viscosity [η]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.8.
Claim 6
Dependent Claim
100 words
A process for preparing ethylene-alpha-olefin-polyene random copolymer rubber of claim 1 comprising the step of copolymerizing ethylene, an alpha-olefin having 3 to 10 carbon atoms, 5-ethylidene-2-norbornene, and 5-vinyl-2-norbornene in a hydrocarbon solvent in the presence of a catalyst formed by (i) a soluble vanadium compound having the formula: VO(OR).sub.n X.sub.3-n (I) or VX.sub.4 (II) wherein R is a hydrocarbon radical having 1 to 10 carbon numbers, X is a halogen atom, and 0≦n≦3; and (ii) an organoaluminum compound R'.sub.m AlX'.sub.3-m (III) wherein R' is a hydrocarbon radical having 1 to 10 carbon atoms, X' is a halogen atom, and 0<m<3.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 4, wherein an atomic ratio of Al/V in the catalyst is 2 to 50.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 4, wherein a molar ratio of ethylene/alpha-olefin is 20/80 to 80/20.
Claim 9
Dependent Claim
17 words
A process as claimed in claim 4, wherein a molar ratio of 5-ethylidene-2-norbornene/5-vinyl-2-norborene is 1/1 to 20/1.
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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |