US4790365A
Expired / Lapsed
US
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Tire compounds containing syndiotactic-1,2-polybutadiene
Assignee: Goodyear Tire and Rubber Co
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Filing: 1987-09-11
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Granted: 1988-12-13
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Expires: 2007-09-11
Abstract
Abstract The subject invention discloses the use of syndiotactic-1,2-polybutadiene in the supporting carcass and/or innerliner of a tire. The incorporation of syndiotactic-1,2-polybutadiene into rubber compositions which are utilized in the supporting carcass or innerliner of tires greatly improves the green strength of those compositions. The incorporation of syndiotactic-1,2-polybutadiene into halogenated butyl rubbers which are utilized as innerliner compositions also greatly improves the scorch safety of such compositions. The subject invention more specifically discloses a pneumatic rubber tire which comprises a circumferential rubber tread, a supporting carcass therefor, two spaced beads, two rubber sidewalls connecting said beads and an innerliner; wherein said supporting carcass is comprised of from 1 to 25 phr of syndiotactic-1,2-polybutadiene having a melting point which is within the range of 120° C. to 190° C. and at least one rubber selected from the group consisting of polyisoprene, styrene-butadiene rubber, and polybutadiene rubber.
Inventors
- 👤 Paul H. Sandstrom
- 👤 Neil A. Maly
- 👤 Mark A. Marinko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:07
CPC Classifications
C; C08; C08L; C08L9/00; B; B60; B60C; B60C1/00; B60C1/0008; C09; C09J; C09J123/00; C09J123/26; C09J123/28; C09J123/283; C08L15/00; C08L15/02; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10S; Y10S152/00; Y10S152/16
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
73 words
A pneumatic rubber tire which comprises a circumferential rubber tread, a supporting carcass therefor, two spaced beads, two rubber sidewalls connecting said beads and an innerliner: wherein said innerliner is comprised of from 1 to 30 phr of syndiotactic-1,2-polybutadiene and at least one rubber selected from the group consisting of polyisoprene and halogenated butyl rubbers, wherein said syndiotactic-1,2-polybutadiene has a melting point which is within the range of 120° C. to 160° C.
Claim 2
Dependent Claim
73 words
A pneumatic rubber tire which comprises a circumferential rubber tread, a supporting carcass therefor, two spaced beads, two rubber sidewalls connecting said beads and an innerliner: wherein said innerliner is comprised of from 1 to 30 phr of syndiotactic-1,2-polybutadiene and at least one rubber selected from the group consisting of polyisoprene and halogenated butyl rubbers, wherein said syndiotactic-1,2-polybutadiene has a melting point which is within the range of 120° C. to 160° C.
Claim 3
Dependent Claim
25 words
A pneumatic rubber tire as specified in claim 1 wherein the member selected from the group consisting of polyisoprene and halogenated butyl rubbers is polyisoprene.
Claim 4
Dependent Claim
27 words
A pneumatic rubber as specified in claim 1 wherein said member selected from the group consisting of polyisoprene and halogenated butyl rubbers is a halogenated butyl rubber.
Claim 5
Dependent Claim
25 words
A pneumatic rubber tire as specified in claim 2 wherein said syndiotactic-1,2-polybutadiene has a melting point within the range of 125° C. to 160° C.
Claim 6
Dependent Claim
47 words
A pneumatic rubber tire as specified in claim 3 wherein said halogenated butyl rubber is a member selected from the group consisting of chlorobutyl rubbers and bromobutyl rubbers; and wherein said syndiotactic-1,2-polybutadiene has a melting point which is within the range of 125° C. to 150° C.
Claim 7
Dependent Claim
23 words
A pneumatic rubber tire as specified in claim 4 wherein said innerliner is comprised of from 2.5 to 15 phr of said syndiotactic-1,2-polybutadiene.
Claim 8
Dependent Claim
23 words
A pneumatic rubber tire as specified in claim 5 wherein said innerliner is comprised of from 2.5 to 15 phr of said syndiotactic-1,2-polybutadiene.
Claim 9
Dependent Claim
24 words
A pneumatic rubber tire as specified in claim 4 wherein said innerliner is comprised of from 5 phr to 10 phr of said syndiotactic-1,2-polybutadiene.
Claim 10
Dependent Claim
24 words
A pneumatic rubber tire as specified in claim 5 wherein said innerliner is comprised of from 5 phr to 10 phr of said syndiotactic-1,2-polybutadiene.
Claim 11
Dependent Claim
27 words
A pneumatic rubber tire as specified in claim 9 wherein said syndiotactic-1,2-polybutadiene has a melting point which is within the range of 130° C. to 140° C.
Claim 12
Dependent Claim
18 words
A pneumatic rubber tire as specified in claim 3 wherein said innerliner further comprises carbon black and sulfur.
Claim 13
Dependent Claim
18 words
A pneumatic rubber tire as specified in claim 1 wherein said syndiotactic-1,2-polybutadiene was synthesized in an aqueous medium.
Claim 14
Dependent Claim
156 words
In a method of preparing a pneumatic rubber tire which includes (a) building an unvulcanized tire which is comprised of a circumferential rubber tread, a supporting carcass therefor, two spaced beads, two rubber sidewalls connecting said beads and an innerliner, and (b) shaping and vulcanizing said tire under conditions of heat and pressure; the improvement which comprises utilizing as the innerliner a rubber composition which is comprised of from 1 to 30 phr of syndiotactic-1,2-polybutadiene and at least one rubber selected from the group consisting of polyisoprene and halogenated butyl rubbers, wherein said syndiotactic-1,2-polybutadiene has a melting point which is within the range of 120° C. to 160° C.; and wherein the rubber composition was prepared by mixing at a temperature which was at least as high as the melting point of the syndiotactic-1,2-polybutadiene; and wherein the syndiotactic-1,2-polybutadiene utilized was in the form of a powder having a particle size of less than about 40 mesh.
Claim 15
Dependent Claim
156 words
In a method of preparing a pneumatic rubber tire which includes (a) building an unvulcanized tire which is comprised of a circumferential rubber tread, a supporting carcass therefor, two spaced beads, two rubber sidewalls connecting said beads and an innerliner, and (b) shaping and vulcanizing said tire under conditions of heat and pressure; the improvement which comprises utilizing as the innerliner a rubber composition which is comprised of from 1 to 30 phr of syndiotactic-1,2-polybutadiene and at least one rubber selected from the group consisting of polyisoprene and halogenated butyl rubbers, wherein said syndiotactic-1,2-polybutadiene has a melting point which is within the range of 120° C. to 160° C.; and wherein the rubber composition was prepared by mixing at a temperature which was at least as high as the melting point of the syndiotactic-1,2-polybutadiene; and wherein the syndiotactic-1,2-polybutadiene utilized was in the form of a powder having a particle size of less than about 40 mesh.
Claim 16
Dependent Claim
50 words
A method of preparing a pneumatic rubber tire as specified in claim 13 wherein said member selected from the group consisting of polyisoprene and halogenated butyl rubbers is a halogenated butyl rubber; and wherein said syndiotactic-1,2-polybutadiene has a melting point which is within the range 125° C. to 150° C.
References Cited (Backward Citations)
US4220564A
Cited
US4394473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-13 | 1992-06-13 | 1992-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-13 | 1996-06-13 | 1996-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-13 | 2000-06-13 | 2000-12-13 | $7700.00 | Window Closed / Lapsed |