Sumitomo Rubber Industries Limited

Honda Motor Co., Ltd.

Takuya Horiguchi

Naohiko Kikuchi

Kazuo Hochi

Takahiro Kawachi

Masako Nakatani

Subaru Toya

Fumiya Kato

Ayuko Yamada

Takashi Nakamura

Takashi Miki

Kenichi Uesaka

Yuka Yokoyama

Tetsuya Kunisawa

Hiroshi Ito

Toshiro Matsuo

Takayuki Nagase

Yoichi Mizuno

Tatsuhiro Tanaka

Keiji Takagi

Toshikazu Kondo

Hiroki Nakajima

Tetsuya Maekawa

Yukari Tomisaki

Emiko Mogi

Akira Minakoshi

Yumi Suzuki

Nanaho Kami

Masataka Hiro

Ayuko Yamana

Noboru Okabe

Yogun Kida

Natsuki Sugimoto

A pneumatic tirecomprises a carcassextending between bead cores of bead portions via a tread portionand sidewall portions, and a belt layerarranged on an outer side in a tire radial direction of the carcassand inside of the tread portion. The pneumatic tirefurther comprises a damping rubber bodyarranged between the carcassand the belt layer, and a noise damperarranged on an inner cavity surface of the tread portion. A width Win a tire axial direction of the damping rubber bodyis in a range of from 60% to 130% of a width Win the tire axial direction of the belt layer, and a water absorption rate of the noise damperis in a range of from 10% to 25%.

Pneumatic tire

Provide is a pneumatic tire that is excellent in air retention properties and adhesion at the interface between the innerliner and the insulation, particularly in the joint portion. Included is a pneumatic tire including: a carcass; an insulation adjacent to the radially inner side of the carcass; and an innerliner adjacent to the radially inner side of the insulation, the innerliner including an innerliner rubber composition, the innerliner rubber composition containing a polymer component including, based on 100% by mass thereof, 80 to 100% by mass of a butyl-based rubber and containing, per 100 parts by mass of the polymer component, 40 to 70 parts by mass of carbon black, 0.5 to 5.0 parts by mass of zinc oxide, and 0.2 to 5.0 parts by mass of sulfur, the insulation including an insulation rubber composition, the insulation rubber composition containing a polymer component including, based on 100% by mass thereof, 20 to 90% by mass of a butyl-based rubber and 10 to 80% by mass of an isoprene-based rubber and containing, per 100 parts by mass of the polymer component, 40 to 80 parts by mass of carbon black and 0.2 to 5.0 parts by mass of sulfur, the innerliner and insulation rubber compositions having butyl-based rubber contents based on 100% by mass of the polymer component that satisfy the following relationship:

To be capable of preventing deterioration of uniformity after puncture repair while suppressing running noise. [Solution] A pneumatic tirecomprises a noise damperfixed to a tire inner cavity surface of a tread portionand formed of a porous material. The noise damperincludes a first partarranged on an outer side in a tire radial direction and fixed to the tire inner cavity surface, and a second partarranged on an inner side in the tire radial direction of the first partand exposed in a tire inner cavity. A water absorption rate of the first partcalculated by a following formula (1) is in a range of from 5% to 25%. Air permeability of the second partmeasured in accordance with Japanese Industrial Standard JIS-L1096 is in a range of from 1 to 7 cm3/cm2/s. The formula (1) is:water absorption rate (%)=weight change before and after immersion (g)/volume at 50% compression (cm3)&#xd7;100 &#x2003;&#x2003;(1).

According to a production method of a rubber composition for tire of the present invention comprising a rubber component (A) comprising at least one selected from the group consisting of a natural rubber and a synthetic diene rubber, a filler, a coupling agent (D) of (CHO)&#x2014;Si&#x2014;(CH)&#x2014;S&#x2014;CO&#x2014;CH, and a vulcanizing agent (E) comprising a vulcanizer and a vulcanization accelerator, the method comprising: a step X1 of kneading all amount of A, a part of the filler and a part of D, a step X2 of kneading the kneaded product of step X1, the remaining amount of the filler and D, and a step F of kneading the kneaded product of step X2 and E, it is possible to produce a rubber composition for tire in which fuel efficiency and abrasion resistance are improved in a good balance.

Production method of rubber composition for tire and tire

Provided is a pneumatic tire capable of improving fuel efficiency, handling stability, and durability in a balanced manner. The present invention relates to a pneumatic tire, comprising a tread that includes a cap layer and a base layer, the cap layer and the base layer satisfying relationships represented by the following formulas (1) to (3):50/50&#x2266;&#x2266;90/10&#x2003;&#x2003;(1)wherein Vc is the volume of the cap layer and Vb is the volume of the base layer,0.65&#x2266;&#x3c;1.00&#x2003;&#x2003;(2), and1.30&#x2266;(tan &#x3b4;)/(tan &#x3b4;)&#x3c;2.40&#x2003;&#x2003;(3)wherein E*c and tan &#x3b4;c are the complex modulus and the loss tangent, respectively, of the cap layer at 30&#xb0; C., and E*b and tan &#x3b4;b are the complex modulus and the loss tangent, respectively, of the base layer at 30&#xb0; C.

A pneumatic tire comprises a tread portion provided with a pair of crown main grooves and a pair shoulder main grooves to divide middle portions and shoulder portions, the tread portion having a contact surface covered with a cap rubber layer with a loss tangent of from 0.03 to 0.18, the middle portions provided with only middle lug grooves with groove widths within 2 mm, each middle lug groove extending from one end connected either the crown or shoulder main groove to the other end terminating within the middle portion, the middle lug grooves having an angle of from 40 to 55 degrees with respect to a tire circumferential direction, and each shoulder portion provided with first shoulder lateral grooves having axially inner ends connected to the shoulder main groove, wherein first shoulder lateral grooves consist of grooves having groove widths within 2 mm.

A pneumatic tire is provided with a tread pattern of left-right asymmetry having an outboard tread edge and an inboard tread edge, and a cap tread rubber having a hardness of from 60 to 75 degrees. An outboard crown land zone defined between middle and outboard main grooves is provided with a circumferentially extending crown sub groove and a crown narrow groove and outboard crown lateral grooves so as to form one row of central crown blocks having an axial width W, one row of outboard crown blocks having an axial width W, and one circumferentially extending crown narrow rib having an axial width W, wherein the axial widths satisfy W&#x3e;=W&#x3e;=W

In order to improve ride quality and steering stability, the present invention provides a pneumatic tire having a sidewall made of a rubber composition for a sidewall comprising at least a natural rubber and a diene rubber comprising a syndiotactic 1,2-polybutadiene, wherein rubber sheets obtained by extruding at a thickness of at most 1.5 mm the rubber composition for a sidewall with a complex modulus E*a in a tire circumferential direction measured at a temperature of 70&#xb0; C. and a dynamic distortion of 2% of 3 to 15 MPa are laminated.

An earth-friendly tire using raw materials derived from non-petroleum resources instead of all or part of raw materials derived from petroleum resources currently used for tires. The tire is prepared by using a natural rubber instead of a synthetic rubber; an inorganic filler and/or a biofiller instead of carbon black; vegetable oil instead of petroleum oil; and natural fiber instead of synthetic fiber so that the tire has a non-petroleum raw material in an amount of at least 75 % by weight based on the total weight of the tire.

Eco tire

A rubber composition which provides an improved balance in grip performance, grip durability and abrasion resistance, and a tire and/or tire tred made from the same Wherein the rubber composition includes a diene rubber, 50 to 120 parts by weight of a reinforcing agent containing particular carbon black and 10 to 100 parts by weight of silica based on 100 parts by weight of a the diene rubber, 2 to 50 parts by weight of a styrene-butadiene polymer, in which weight average molecular weight is 1,000 to 15,000, the amount of a styrene being 17 to 27% by weight and the amount of vinyl being 60 to 80% by weight, and 2 to 25 parts by weight of an indene resin, in which the melting point is 100 to 150&#xb0; C., based on 100 parts by weight of the diene rubber which includes at least 60% by weight of a particular solution polymerization styrene-butadiene rubber and at most 40% by weight of a natural rubber and/or a butadiene rubber.

Rubber composition and tire comprising the same

The present invention provides a rubber composition which can sufficiently improve performance on ice and snow and wet gripping properties, and a pneumatic tire using the same. The rubber composition comprises, based on 100 parts by weight of diene rubber (A), 2 to 20 parts by weight of short fiber (B) having an average fiber diameter of 10 to 100 &#x3bc;m and average fiber length of 0.01 to 4 mm, 1 to 10 parts by weight of particles (C) having a Moh's hardness of at least 5 and average particle size of at most 500 &#x3bc;m, and 1 to 15 parts by weight of starch/plasticizer composite material (D), and the pneumatic tire has a tread made of the rubber composition.

Rubber composition and pneumatic tire using the same

An earth-friendly tire using raw materials derived from non-petroleum resources instead of all or part of raw materials derived from petroleum resources currently used for tires. The tire is prepared by using a natural rubber instead of a synthetic rubber; an inorganic filler and/or a biofiller instead of carbon black; vegetable oil instead of petroleum oil; and natural fiber instead of synthetic fiber so that the tire comprises a non-petroleum raw material in an amount of at least 75% by weight based on the total weight of the tire.

Growing community of inventors

Kobe, Japan

Takuya Horiguchi