公开(公告)号：US20170144490A1

公开(公告)日：2017-05-25

申请号：US15129764

申请日：2015-03-31

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Keisuke MAEJIMA ,  Satoshi MIHARA

IPC: B60C11/16 ,  C08L9/00 ,  B60C11/12 ,  C08L7/00 ,  B60C1/00 ,  B60C11/11

CPC classification number: B60C11/1637 ,  B60C1/00 ,  B60C1/0016 ,  B60C11/00 ,  B60C11/11 ,  B60C11/1204 ,  B60C11/16 ,  B60C11/1625 ,  B60C11/1656 ,  B60C11/1668 ,  B60C2011/1213 ,  C08K3/04 ,  C08K3/36 ,  C08K5/01 ,  C08K9/10 ,  C08K2201/006 ,  C08L7/00 ,  C08L9/00 ,  C08L9/06 ,  C08L91/00 ,  C08L91/06 ,  C08L2205/02 ,  C08L2205/03 ,  C08L21/00 ,  C08K5/548 ,  C08K3/22 ,  C08K5/09 ,  C08K3/06 ,  C08K5/18 ,  C08K5/31

Abstract: A studded tire includes stud pins embedded in a road contact surface of a tread portion 1; the rubber composition forming the tread portion containing at least one of natural rubber, styrene-butadiene rubber, and butadiene rubber, from 5 to 50 parts by weight of carbon black and from 5 to 70 parts by weight of silica per 100 parts by weight of the diene rubber; a nitrogen adsorption specific surface area of the carbon black being from 50 to 120 m2/g; a CTAB specific surface area of the silica being from 80 to 190 m2/g; a rubber hardness of the rubber composition being not greater than 60; and a product of a stress at the time of 400% elongation and a bottom surface area of a flange portion on a bottom side of the stud pins being not less than 400 MPa·mm2 and not greater than 850 MPa·mm2.

公开(公告)号：US20200270420A1

公开(公告)日：2020-08-27

申请号：US16646340

申请日：2018-09-10

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Ayaki KAZARIYA ,  Makoto ASHIURA ,  Satoshi MIHARA ,  Kazushi KIMURA ,  Hirokazu KAGEYAMA

IPC: C08K5/3462

Abstract: The present invention provides a rubber composition for a tire, the rubber composition containing: a diene rubber; silica; and a heterocyclic compound (where, the heterocyclic compound does not have a silicon atom) having a hydrocarbon group having from 3 to 30 carbons and at least one type of heterocycle selected from the group consisting of a piperazine ring, a morpholine ring, and a thiomorpholine ring; an average glass transition temperature of the diene rubber being −50° C. or higher; a content of the silica being from 80 to 200 parts by mass per 100 parts by mass of the diene rubber; and a content of the heterocyclic compound being from 0.5 to 20% by mass with respect to the content of the silica. Such rubber composition has excellent processability, exhibits excellent wet grip performance and has low rolling resistance when the rubber composition is formed into a tire.

公开(公告)号：US20190023880A1

公开(公告)日：2019-01-24

申请号：US16078276

申请日：2017-02-10

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Kazuya UENISHI ,  Makoto ASHIURA ,  Motoji FUJITA ,  Naoya AMINO ,  Satoshi MIHARA ,  Yu SHINKE

IPC: C08L9/06 ,  C08F236/10 ,  C08K5/3412 ,  C08K3/16 ,  C08K5/56 ,  C08K5/1515

Abstract: The present invention is to provide an aromatic vinyl-diene copolymer which exhibits excellent mechanical properties and wear resistance when being formed into a tire, a method for producing the aromatic vinyl-diene copolymer, and a rubber composition containing the aromatic vinyl-diene copolymer. The aromatic vinyl-diene copolymer of an embodiment of the present invention is an aromatic vinyl-diene copolymer which is a copolymer of an aromatic vinyl and a diene, wherein the content of a repeating unit derived from an aromatic vinyl is 18 mass % or greater, among repeating units derived from a diene, a proportion of a vinyl structure is 8 mol % or less, a proportion of a 1,4-trans structure is 75 mol % or less, and a proportion of a 1,4-cis structure is from 17 to 90 mol %, and a glass transition temperature is −60° C. or lower.

公开(公告)号：US20180207984A1

公开(公告)日：2018-07-26

申请号：US15744940

申请日：2016-07-22

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Satoshi MIHARA ,  Kazushi KIMURA ,  Hirokazu KAGEYAMA

IPC: B60C1/00 ,  C08L9/06 ,  C08F2/22 ,  C08F236/06 ,  C08K5/37

Abstract: The present invention provides: a rubber composition for tires which has excellent processability and has excellent low heat build-up when formed into a tire; and a pneumatic tire using the same. The rubber composition for tires of the present invention is a rubber composition for tires, the rubber composition containing a diene rubber (A) and a microparticle (B), a vinyl group content of the diene rubber (A) being from 5 to 35 mass %, the microparticle (B) being a mercapto group-containing organic microparticle in which a crosslinkable oligomer or polymer (b1) is crosslinked, an average particle size of the microparticle (B) being from 1 to 200 μm, and a content of the microparticle (B) being from 1 to 55 parts by mass per 100 parts by mass of the diene rubber (A).

公开(公告)号：US20180044510A1

公开(公告)日：2018-02-15

申请号：US15557618

申请日：2016-03-18

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Kazushi KIMURA ,  Hirokazu KAGEYAMA ,  Satoshi MIHARA

IPC: C08L9/06 ,  B60C1/00

CPC classification number: C08L9/06 ,  B60C1/00 ,  B60C1/0016 ,  C08K3/04 ,  C08K3/36 ,  C08L9/00 ,  C08L101/00 ,  C08L2205/14 ,  C08L2205/22 ,  C08L75/04 ,  C08K5/548 ,  C08K3/22 ,  C08K3/06 ,  C08K5/47 ,  C08K5/18

Abstract: Provided are a tire rubber composition capable of producing a pneumatic tire having excellent rigidity and wear resistance and a pneumatic tire using the same. The tire rubber composition includes 100 parts by mass of a diene rubber (A) and from 1 to 50 parts by mass of elastic microparticles (B), wherein the elastic microparticles (B) have a form of microparticles obtained by crosslinking a crosslinkable oligomer or polymer (b1) in water or an organic solvent, or in the diene rubber (A), and have an average particle size of from 0.001 to 100 μm, the JIS A hardness of a cured product obtained by crosslinking the crosslinkable oligomer or polymer (b1) without use of water, the organic solvent or the diene rubber (A) is greater than 45, and the elongation of the cured product is 200% or greater.

公开(公告)号：US20180281520A1

公开(公告)日：2018-10-04

申请号：US15754119

申请日：2016-08-26

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Kazushi KIMURA ,  Hirokazu KAGEYAMA ,  Satoshi MIHARA

IPC: B60C1/00 ,  C08K3/04 ,  C08K3/36 ,  C08L7/00 ,  C08L9/08

Abstract: A rubber composition for a tire contains 100 parts by mass of a diene rubber (A) and from 1 to 60 parts by mass of an organic microparticle (B); an average particle size of the organic microparticle (B) being from 0.001 to 100 μm, the organic microparticle (B) having a complex structure composed of a compatible component that is compatible with the diene rubber (A) and an incompatible component that is not compatible with the diene rubber (A), the complex structure having an inner part in which an amount of the incompatible component is greater than an amount of compatible component, and an outer part which covers at least a part of the inner part and in which the amount of the compatible component is greater than an amount of the incompatible component. A pneumatic tire including such rubber composition has a desirable elongation, rigidity, durability, and wear resistance.

公开(公告)号：US20170121494A1

公开(公告)日：2017-05-04

申请号：US15315839

申请日：2015-06-04

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Masaki SATO ,  Satoshi MIHARA

IPC: C08K3/36 ,  C08K5/548 ,  B60C1/00

CPC classification number: C08K3/36 ,  B60C1/00 ,  B60C1/0016 ,  C08K5/548 ,  C08L9/00 ,  C08L9/06 ,  Y02T10/862

Abstract: The present invention provides a rubber composition a tire, by which both low rolling resistance and wet grip performance can be achieved at high levels. This rubber composition for a tire is obtained by blending from 66 to 180 parts by weight of a silica having a nitrogen adsorption specific surface area of from 150 to 400 m2/g into 100 parts by weight of a diene rubber; a size Rss of aggregates of the silica forming a hierarchical structure being from 14 to 23 nm when the rubber composition is measured by ultra-small-angle X-ray scattering and an obtained scattering profile is applied to a Unified-Guinier function.

公开(公告)号：US20200325310A1

公开(公告)日：2020-10-15

申请号：US16753225

申请日：2018-10-04

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Ayaki KAZARIYA ,  Makoto ASHIURA ,  Satoshi MIHARA ,  Kazuya UENISHI ,  Yu SHINKE

IPC: C08L9/06 ,  B60C1/00 ,  C08F236/06 ,  C08K3/36 ,  C08K5/544

Abstract: A rubber composition for a tire contains a diene rubber, silica, and a specific modified butadiene polymer, wherein the diene rubber contains an aromatic vinyl-conjugated diene rubber A and at least one rubber component B selected from an aromatic vinyl-conjugated diene rubber b1 other than the rubber A and a butadiene rubber b2 having a weight average molecular weight of ≥15000. A content of the aromatic vinyl-conjugated diene rubber A is from 30 to 90% by mass, and a content of the rubber component B is from 10 to 70% by mass, an average TG of the diene rubber is lower than −20° C., a content of the silica is from 80 to 200 parts by mass per 100 parts by mass of the diene rubber, and a content of the modified butadiene polymer is from 1.0 to 25.0% by mass with respect to content of the silica.

公开(公告)号：US20180282446A1

公开(公告)日：2018-10-04

申请号：US15758927

申请日：2016-09-08

Applicant: THE YOKOHAMA RUBBER CO., LTD.

Inventor： Kazuya UENISHI ,  Naoya AMINO ,  Makoto ASHIURA ,  Motoji FUJITA ,  Satoshi MIHARA ,  Yu SHINKE

IPC: C08F36/06

Abstract: The present invention is to provide a diene polymer that exhibits excellent low rolling resistance when used in a tire, a method for producing the diene polymer, and a rubber composition containing the diene polymer. The diene polymer of an embodiment of the present invention is produced by polymerizing a monomer containing at least a diene monomer by using an initiator prepared from an organolithium compound, an alkyl aluminum, and a metal alcoholate, and then terminating the polymerization by using an electrophile selected from the group consisting of titanium halides, tin halides, cyclic silazanes, alkoxysilanes, epoxides, amines, ketones, and compounds represented by Formula (N) below.