B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
152/124
B60C 11/18 (2006.01) B60C 1/00 (2006.01) B60C 11/00 (2006.01) C08L 7/00 (2006.01) C08L 9/00 (2006.01)
Patent
CA 2010462
A radial tire which is provided herein has a tread comprising a central portion and two lateral shoulder portions made of a rubber composition which is different from that of the central portion. The axial distance of each of the boundaries between the radially-outer surface of the central portion and the radially-outer surfaces of the shoulder portions from the tire equator are not less than 0.15 times and not more than 0.3 times the tread width. The tread includes a shoulder portion and two shoulder portions. The tread is provided with two circumferentially-extending grooves, the boundary between the central portion and each shoulder portion being located within the width of each of the grooves in the tread. The rubber composition of the shoulder portions consists of: natural rubber, butadiene rubber of which trans-1,4-bond content is not less than 54% and less than 70%, and carbon black of 10 to 30 microns in particle diameter. The ratio of the natural rubber content to the butadiene rubber content in part-by-weight unit is 85/15 to 20/80. The carbon black content is 20 to 70 parts by weight. The Shore-A hardness of the shoulder portion is larger than the Shore-A hardness of the central portion. The difference between the Shore-A hardness of the shoulder portion and the Shore-A hardness of the central portion is 2 degrees and not more than 6 degrees. The Shore-A hardness of the shoulder portion is in the range of 65 to 75 degrees, and the Shore-A hardness of the central portion is in the range of 60 to 70 degrees.
Borden Ladner Gervais Llp
Kawamura Kazuhiko
Sumitomo Rubber Industries Limited
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