Claims
- 1. Rubber compositions for tires consisting mainly of a rubber blend consisting of 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber obtained by copolymerizing styrene with 1,3-butadiene in the presence of an alkyl-lithium catalyst and containing 3-30% by weight of bonded styrene and not less than 60% by weight of 1,2-bond in the butadiene unit, and 90-10% by weight of a dienic rubber having a glass transition temperature of lower than -60.degree. C., said dienic rubber being at least one member selected from the group consisting of natural rubber, synthetic polyisoprene rubber, polybutadiene rubber and ethylene-propylene-diene ternary copolymeric rubber.
- 2. Rubber compositions as claimed in claim 1, wherein the glass transition temperature of the high vinyl amorphous butadiene-styrene copolymeric rubber is -35.degree. C. to 0.degree. C.
- 3. Rubber compositions for tires consisting mainly of a rubber blend consisting of 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber obtained by copolymerizing styrene with 1,3-butadiene in the presence of an alkyl-lithium catalyst containing 3-10% by weight of bonded styrene and more than 80% to 95% by weight of 1,2-bond in the butadiene unit, and 90-10% by weight of a dienic rubber having a glass transition temperature of lower than -60.degree. C.
- 4. Rubber compositions as claimed in claim 3, wherein the glass transition temperature of the high vinyl amorphous butadiene-styrene copolymeric rubber is -35.degree. C. to 0.degree. C.
- 5. Rubber compositions as claimed in claim 3, wherein the dienic rubber is natural rubber, synthetic polyisoprene rubber, polybutadiene rubber, styrene-butadiene copolymeric rubber or ethylene-propylene-diene ternary copolymeric rubber.
- 6. Rubber compositions as claimed in claim 1, which contain 1-40 parts by weight of a softening agent and 5-70 parts by weight of carbon black, said parts by weight being based on 100 parts by weight of the rubber blend.
- 7. Rubber compositions as claimed in claim 2, which contain 1-40 parts by weight of a softening agent and 5-70 parts by weight of carbon black, said parts by weight being based on 100 parts by weight of the rubber blend.
- 8. Rubber compositions as claimed in claim 3, which contain 1-40 parts by weight of a softening agent and 5-70 parts by weight of carbon black, said parts by weight being based on 100 parts by weight of the rubber blend.
- 9. Rubber compositions as claimed in claim 4, which contain 1-40 parts by weight of a softening agent and 5-70 parts by weight of carbon black, said parts by weight being based on 100 parts by weight of the rubber blend.
- 10. Rubber compositions as claimed in claim 1, wherein said alkyl-lithium catalyst is n-butyl-lithium.
- 11. Rubber compositions as claimed in claim 3, wherein said alkyl-lithium catalyst is n-butyl-lithium.
Priority Claims (1)
Number |
Date |
Country |
Kind |
55-13537 |
Feb 1980 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 231,529, filed Feb. 4, 1981 now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3498963 |
Ichikawa et al. |
Mar 1970 |
|
3522332 |
Ichikawa et al. |
Jul 1970 |
|
4220564 |
Tanimoto et al. |
Sep 1980 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
46-37418 |
Nov 1971 |
JPX |
1504734 |
Mar 1978 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
231529 |
Feb 1981 |
|