Tire for heavy load
AssigneeBridgestone Corporation
InventorKenjiro Yanai
Life of this patent
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Abstract
In a tire for a heavy load in which a belt is formed by laminating rubber-coated cord layers prepared by embedding steel cords in a coating rubber, an end part of at least one rubber-coated cord layer or an end part of the belt is coated with a rubber composition containing trans-polybutadiene (TRBR) and bismaleimide (BMI) in the following compounding amounts based on 100 parts by mass of a rubber component containing natural rubber and isoprene rubber: 0.1 part by mass≦TRBR+BMI≦0.0 parts by mass TRBR/(TRBR+BMI)≧25% whereby cracks originating from separation between the steel cords at an end part of the belt and the coating rubber are prevented from being generated.
Claims9
A tire for a heavy load which is provided with bead cores, a carcass ply, a belt arranged at the outside of the carcass ply in a radial direction and a tread and in which the belt is formed by laminating rubber-coated cord layers prepared by embedding steel cords in a coating rubber, wherein an end part of at least one rubber-coated cord layer or an end part of the belt is coated with a rubber composition containing trans-polybutadiene (TRBR) and bismaleimide (BMI) in the following compounding amounts based on 100 parts by mass of a rubber component containing natural rubber and isoprene rubber:
- 0.1 part by mass≦TRBR+BMI≦10.0 parts by mass
- TRBR/(TRBR+BMI)≧25%
Dependencies are inferred from the claim text.