3results about How to "Improve wet grip performance" patented technology

The present invention improves wet grip performance after high-speed driving. A tire having a tread portion is provided. The crown rubber layer forming the tread portion is formed of a rubber composition in which 60 to 80 parts by mass of the 100 parts by mass of the rubber component are composed of a styrene-butadiene rubber (SBR) having a styrene content of 25 mass% or less. The rubber composition contains 100 parts by mass or more of silica per 100 parts by mass of the rubber component. The rubber composition has a loss tangent (30 DEG C tan [delta]) of less than 0.27 when measured in a tensile deformation mode at a temperature of 30 DEG C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%. The thickness of the tread portion is 13 mm or less.

A modified conjugated diene-based polymer including: a structural unit derived from a conjugated diene compound; and a structural unit derived from an aromatic vinyl compound, and when Tgr (unit: K) is the glass transition temperature measured in accordance with Japan Industrial Standard K 6240: 2011 and Tgcl (unit: K) is the glass transition temperature obtained by numerical formula (1), Tgr and Tgcl satisfy the relationship of numerical formula (2). WAr is the mass fraction of the structural unit derived from the aromatic vinyl compound in the modified conjugated diene polymer, and 0 < = WAr < = 1 is satisfied. # imgabs0 #

The present utility model relates to the technical field of tires, and provides a tire with high wet grip performance throughout its life cycle, including: a carcass; the crown part of the carcass sequentially has an inner liner layer, a ply layer, a belt layer, a chafe layer, a second tread rubber, and a first tread rubber from bottom to top; multiple main drainage grooves are longitudinally distributed on the first tread rubber and the second tread rubber; multiple transverse grooves are provided on the first tread rubber and the second tread rubber. The present utility model adopts a double-tread rubber structure and a deep groove design for the main drainage grooves, which can improve the wear resistance and wet grip performance of the tires, achieve high wet grip performance and drainage efficiency throughout the life cycle, and extend the service life of the tires.