B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
400/6443
B60C 1/00 (2006.01) C08K 5/44 (2006.01) C08K 5/47 (2006.01) C08L 21/00 (2006.01)
Patent
CA 1265885
ABSTRACT OF THE DISCLOSURE A synthetic rubber (SR) tire tread of synthetic rubber comprising styrene-butadiene rubber (SBR) and optionally butyl rubber, which SR is essentially free of natural rubber (NR), upon vulcanization with sulfur in the presence of a combination of sulfen- amide accelerators, provides excellent oxidative stability, resistance to hardening, and flex resistance, despite increasing the level of sulfur to an amount in the range from 2.0-3.0 phr; the tread compounds include from 0.3 to 1.5 phr of benzothia- zole sulfenamide (BTS) and from 0.5 to 1.5 phr of a thiocarbamyl sulfenamide (TCS); the total amount of sulfenamide acceslerators being less than 2.0 phr and there being more TCS than BTS; the crosslink network generated by the use of TCS in combination with BTS, which combination produces poor oxidation stability in a predominantly NR containing rubber, is not produced in SR.
517821
Swabey Ogilvy Renault
The B.f. Goodrich Company
LandOfFree
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