Patent ID: 6462099
Filing Date: 2002-10-08
Classification: B60C,C08J,C08L,Y02W,Y10S

Abstract:
A 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; and wherein the tread is comprised of cured blend of (a) about 10 phr to about 30 phr of surface devulcanized reclaimed rubber crumb comprised of a core and an outer shell, wherein core is comprised of a cured rubber and wherein the outer shell is comprised of devulcanized rubber said reclaimed rubber crumb is made by a process comprising the step of heating the reclaimed rubber to a temperature which is within the range of 150Â° C. to about 300Â° C. under a pressure of at least 3.4Ã—106 Pascals in the presence of 2-butanol to devulcanize the surface of the rubber, wherein the vulcanized rubber has particle size of about 325 mesh to about 20 mesh, and (b) about 70 phr to about 90 phr of a sulfur-curable virgin rubber.