Claims
- 1. A pneumatic tire which is comprised of a generally toroidal-shaped carcass with an outer circumferential tread, two spaced beads, at least one ply extending from bead to bead and sidewalls extending radially from and connecting said tread to said beads; wherein said tread is adapted to be ground-contacting; wherein the tread is comprised of (a) about 60 phr to about 90 phr of a cis-1,4-polybutadiene rubber, wherein the cis-1,4-polybutadiene rubber has a glass transition temperature which is within the range of about −104° C. to about −80° C., (b) about 10 phr to about 40 phr of at least one additional rubbery polymer selected from the group consisting of polyisoprene rubber, polybutadiene rubber, isoprene-butadiene rubber, and styrene-isoprene-butadiene rubber, wherein the additional rubbery polymer has a glass transition temperature which is within the range of about −30° C. to about −10° C., and (c) about 20 phr to about 60 phr of carbon black, wherein the carbon black has a dibutylphthalate absorption value of at least 140 cm3/100 grams and wherein the carbon black has a cetyl trimethyl ammonium bromide adsorption area which is within the range of about 60 to about 90.
- 2. A pneumatic tire as specified in claim 1 wherein the tread is further comprised of silica.
- 3. A pneumatic tire as specified in claim 2 wherein the tread is further comprised of a processing oil.
- 4. A pneumatic tire as specified in claim 3 wherein the processing oil is present at a level which is within the range of about 2 phr to about 18 phr.
- 5. A pneumatic tire as specified in claim 3 wherein the carbon black has a dibutylphthalate absorption value of at least 150 cm3/100 grams.
- 6. A pneumatic tire as specified in claim 5 wherein the cis-1,4-polybutadiene rubber is present at a level within the range of about 70 phr to about 90 phr, and wherein the additional rubbery polymer is present at a level which is within the range of about 10 phr to about 30 phr.
- 7. A pneumatic tire as specified in claim 5 wherein the carbon black has a cetyl trimethyl ammonium bromide absorption area which is within the range of 70 to 85.
- 8. A pneumatic tire as specified in claim 7 wherein the carbon black is present at a level within the range of about 30 phr to about 55 phr.
- 9. A pneumatic tire as specified in claim 8 wherein the carbon black has a dibutylphthalate absorption value of at least 160 cm3/100 grams.
- 10. A pneumatic tire as specified in claim 9 wherein the cis-1,4-polybutadiene rubber is present at a level within the range of about 80 phr to about 90 phr, and wherein the additional rubbery polymer is present at a level which is within the range of about 10 phr to about 20 phr.
- 11. A pneumatic tire as specified in claim 10 wherein the carbon black is present at a level within the range of about 40 phr to about 50 phr.
- 12. A pneumatic tire as specified in claim 4 wherein the additional rubbery polymer is a synthetic polyisoprene rubber.
- 13. A pneumatic tire as specified in claim 9 wherein the additional rubbery polymer is a synthetic polyisoprene rubber.
- 14. A pneumatic tire as specified in claim 4 wherein the additional rubbery polymer is a polybutadiene rubber.
- 15. A pneumatic tire as specified in claim 9 wherein the additional rubbery polymer is a polybutadiene rubber.
- 16. A pneumatic tire as specified in claim 4 wherein the additional rubbery polymer is a styrene-isoprene-butadiene rubber.
- 17. A pneumatic tire as specified in claim 9 wherein the additional rubbery polymer is a styrene-isoprene-butadiene rubber.
Parent Case Info
[0001] This is a divisional of U.S. patent application Ser. No. 09/616,271, filed on Jul. 14, 2000, which claims the benefit of U.S. Provisional Patent Application Serial No. 60/149,592, filed on Aug. 18, 1999.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60149592 |
Aug 1999 |
US |
Divisions (1)
|
Number |
Date |
Country |
Parent |
09616271 |
Jul 2000 |
US |
Child |
10681516 |
Oct 2003 |
US |