US4380607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber composition having high modulus of elasticity and process for preparing same
Assignee: JSR Corp
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Filing: 1981-04-23
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Granted: 1983-04-19
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Expires: 2001-04-23
Abstract
Abstract A rubber composition consisting essentially of a dispersion in which particles of a high-melting isotactic poly-α-olefin having a melting point of at least 150° C. are uniformly dispersed in a rubber matrix, said particles having an average particle size of not more than 200μ, has a high modulus of elasticity and also excellent tear resistance. Such rubber composition can be obtained, for example, by mixing fine powder of said isotactic poly-α-olefin having an average particle size of not more than 200μ with a rubber solution, dispersing the particles uniformly in said rubber solution and recovering a rubber composition from the dispersion.
Inventors
- 👤 Hiroharu Ikeda
- 👤 Kohei Goto
- 👤 Yasuyuki Shimozato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:11
CPC Classifications
C; C08; C08L; C08L21/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
52 words
A rubber composition having a high modulus of elasticity consisting essentially of a dispersion in which fine particles of a high-melting isotactic poly-α-olefin having a melting point of at least 150° C. are uniformly dispersed in a rubber matrix, said fine particles having an average particle size of not more than 200μ.
Claim 2
Dependent Claim
52 words
A rubber composition having a high modulus of elasticity consisting essentially of a dispersion in which fine particles of a high-melting isotactic poly-α-olefin having a melting point of at least 150° C. are uniformly dispersed in a rubber matrix, said fine particles having an average particle size of not more than 200μ.
Claim 3
Dependent Claim
23 words
A rubber composition according to claim 1, wherein the high-melting isotactic poly-α-olefin particles have an average particle size of not more than 50μ.
Claim 4
Dependent Claim
32 words
A rubber composition according to claim 1, wherein the high-melting isotactic poly-α-olefin particles are dispersed in a ratio of 2 to 40% by weight based on the weight of the rubber composition.
Claim 5
Dependent Claim
48 words
A rubber composition according to claim 1, 2 or 3, wherein the high-melting isotactic poly-α-olefin is selected from the group consisting of isotactic polypropylene, polyallylcyclopentane, polyallylcyclohexane, polyallylbenzene, poly(3-methyl-1-butene), poly(3-cyclohexyl-1-butene), poly(4-phenyl-1-butene), poly(3-methyl-1-pentene), poly(4-methyl-1-pentene), poly(3-methyl-1-hexene), poly(4-methyl-1-hexene), polyvinylcyclopentane, a copolymer of propylene and allylbenzene, and a copolymer of 3-methyl-1-butene and 1-butene.
Claim 6
Dependent Claim
20 words
A rubber composition according to claim 1, 2 or 3, wherein the high-melting isotactic poly-α-olefin is isotactic polypropylene or poly(4-methyl-1-pentene).
Claim 7
Dependent Claim
35 words
A rubber composition according to claim 1, 2 or 3, wherein the rubber is selected from the group consisting of polyisoprene rubber butadiene rubber, styrene-butadiene rubber, butadiene-pentadiene-styrene rubber, ethylene-propylene rubber, isobutylene-isoprene rubber and natural rubber.
Claim 8
Dependent Claim
32 words
A rubber composition according to claim 4, wherein the rubber is selected from the group consisting of polyisoprene rubber butadiene rubber, styrene-butadiene rubber, butadiene-pentadiene-styrene rubber, ethylene-propylene rubber, isobutylene-isoprene rubber and natural rubber.
Claim 9
Dependent Claim
13 words
A rubber composition according to claim 6, wherein said rubber is polyisoprene rubber.
Claim 10
Dependent Claim
13 words
A rubber composition according to claim 7, wherein said rubber is polyisoprene rubber.
Claim 11
Dependent Claim
54 words
A rubber composition having a high modulus of elasticity consisting essentially of a dispersion in which fine particles of a high-melting isotactic polypropylene having a melting point of at least 150° C. are uniformly dispersed in a polyisoprene rubber matrix, said fine particles having an average particle size of not more than 200 microns.
Claim 12
Dependent Claim
54 words
A rubber composition having a high modulus of elasticity consisting essentially of a dispersion in which fine particles of a high-melting isotactic polypropylene having a melting point of at least 150° C. are uniformly dispersed in a polyisoprene rubber matrix, said fine particles having an average particle size of not more than 200 microns.
References Cited (Backward Citations)
US3701702A
Cited
US3751524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |