The Yokohama Rubber Co. | Date: 2015-09-29
A pneumatic tire having an air impermeable layer. A film formed of a thermoplastic resin or thermoplastic elastomer composition comprising a blend of a thermoplastic resin and an elastomer is used for the air impermeable layer. Separation of the film is prevented and an inner appearance of the tire is improved. The air impermeable layer
The Yokohama Rubber Co. | Date: 2015-12-02
Provided is a modified diene based polymer in which a diene based polymer is graft modified with a polyether having a mercapto group attached via diurethane bonding. Formation of diurethane bonding is performed by allowing sequential reactions of two species of hydroxyl group-containing compounds with an diisocyanate compound. By adding the modified diene based polymer to a silica-containing rubber composition for automobile pneumatic tires, the dispersibility of silica compounded in the rubber composition can be improved, and a property inherent in silica which simultaneously allows a reduction of rolling resistance and a stability on wet road surfaces can be sufficiently effected.
The Yokohama Rubber Co. | Date: 2015-08-24
A pneumatic tire includes: a plurality of projections provided on a tire outer side surface of the pneumatic tire, wherein each of the projections has a height in a range from 0.5 mm to 4 mm and a maximum height at a position outer, in the tire radial direction, than a position where a tire total width is maximum, and wherein the pneumatic tire includes: an outer diameter and a total width excluding the projections are set to fall within ranges from 0 mm to 6 mm with respect to lower limits of standard dimensions in a state where the pneumatic tire is fitted to a standard rim and a normal internal pressure is applied; and a tread ground contact width at 60% load being set to fall within a range from 60% to 75% of the total width excluding the projections.
The Yokohama Rubber Co. | Date: 2014-01-10
In a pneumatic tire, the groove width of the connecting subsidiary grooves changes midway. The relationship between the groove width connecting to the circumferential main groove on the outer side in the tire width direction and the groove width connecting to the circumferential main groove on the inner side in the tire width direction satisfies the range of 0.30W1/W20.70. The relationship between the groove length on the tread surface having a region of groove width and the groove length on the tread surface having a region of groove width satisfies the range of 0.25L2/L10.65. Sipes are provided on the tread surface of the block-like land portions. The respective end portions of the sipes connect to a position where the groove width of the connecting subsidiary grooves changes to the groove width.
The Yokohama Rubber Co. | Date: 2015-08-06
A rubber composition includes a sulfur-crosslinkable diene rubber, from 1 to 100 parts by mass of carbon black and/or from 5 to 150 parts by mass of an inorganic filler, from 0.5 to 30 parts by mass of a sulfur-containing compounding agent, and from 0.01 to 20 parts by mass of a phosphine borane compound based on 100 parts by mass of the sulfur-crosslinkable diene rubber. The rubber composition may be applied in at least one type selected from the group consisting of a capped tread, a side wall, a belt, an inner liner, a carcass, and a bead of a pneumatic tire.