-
公开(公告)号：EP3882047A1
公开(公告)日：2021-09-22
申请号：EP19885556.1
申请日：2019-10-15
发明人： KITAGO, Ryota , YASUDA, Rie , HIRAO, Shogo
摘要： The purpose is to provide rubber compositions and pneumatic tires which have reduced changes in complex modulus E* over time. The present invention relates to rubber compositions containing at least one copolymer obtained by copolymerizing an aromatic vinyl compound and a conjugated diene compound, the rubber compositions having a heat aging resistance index defined by equation (1) of 27 or less.
-
公开(公告)号：EP4092078A3
公开(公告)日：2023-03-08
申请号：EP22168521.7
申请日：2022-04-14
发明人： HIRAO, Shogo , KITAGO, Ryota , YOKOYAMA, Yuka , SATO, Daisuke , ISHINO, Soh
摘要： Provided are a cap tread and a passenger car tire which provide improved overall performance in terms of fuel economy and tensile strength at break while having good dimensional stability. Included is a cap tread of a passenger car tire, including a rubber composition A phase and a rubber composition B phase which are independent of and share a boundary with each other, the rubber composition A phase containing, per 100 parts by mass of the rubber components therein, 100 parts by mass or more of silica and 10 parts by mass or less of carbon black, the rubber composition B phase containing, per 100 parts by mass of the rubber components therein, 10 parts by mass or more of carbon black and 13 to 20 parts by mass of silica, the rubber composition B phase being divided by the rubber composition A phase to be independently present in the rubber composition A phase
-
公开(公告)号：EP3882306A1
公开(公告)日：2021-09-22
申请号：EP19884160.3
申请日：2019-10-15
发明人： KITAGO, Ryota , YASUDA, Rie , HIRAO, Shogo
摘要： The purpose is to provide rubber compositions and pneumatic tires which have reduced changes in tan δ over time. The present invention relates to rubber compositions containing at least one copolymer obtained by copolymerizing an aromatic vinyl compound and a conjugated diene compound, the rubber compositions having a heat aging resistance index defined by equation (1) of 2.0 or less.
-
公开(公告)号：EP3882307A1
公开(公告)日：2021-09-22
申请号：EP19884890.5
申请日：2019-10-15
发明人： KITAGO, Ryota , YASUDA, Rie , HIRAO, Shogo
摘要： The purpose is to provide rubber compositions and pneumatic tires which have reduced changes in tan δ peak temperature over time. The present invention relates to rubber compositions containing at least one copolymer obtained by copolymerizing an aromatic vinyl compound and a conjugated diene compound, the rubber compositions having a heat aging resistance index defined by equation (1) of 0.45 or less.
-
公开(公告)号：EP4385753A1
公开(公告)日：2024-06-19
申请号：EP23209000.1
申请日：2023-11-10
发明人： SATO, Daisuke , KITAGO, Ryota , HIRAO, Shogo
IPC分类号： B60C1/00 , B60C11/00 , C08L9/06 , C08F236/22
CPC分类号： B60C1/0016 , B60C11/00 , C08L9/06 , C08F236/22
摘要： Provided is a tire with excellent overall performance in terms of abrasion resistance, wet grip performance, and bleed resistance. The present invention relates to a tire which includes a tread including a rubber composition that contains a rubber component and a branched conjugated diene polymer, wherein the branched conjugated diene polymer is a copolymer at least containing a branched conjugated diene, butadiene, and styrene as structural units, and the tire satisfies the following relationships (1) and (2): Relationship (1): 0.25
-
公开(公告)号：EP4091836A1
公开(公告)日：2022-11-23
申请号：EP22172306.7
申请日：2022-05-09
发明人： KITAGO, Ryota , HIRAO, Shogo , YOKOYAMA, Yuka
摘要： Provided are a passenger car tire rubber composition and a passenger car tire which enable a reduction in the use of raw materials derived from fossil fuels in consideration of the environment while also improving the required properties of tires, such as wet grip performance and tensile strength. The present invention relates to a passenger car tire rubber composition, having a percent modern carbon (pMC) of components based on butadiene and/or aromatic vinyls of 30% or higher as measured in accordance with ASTM D6866-10, a butadiene-derived unit content of 80 to 100% by mass based on 100% by mass of the total units of the rubber components, and an aromatic vinyl-derived unit content of 0 to 20% by mass based on 100% by mass of the total units of the rubber components, and containing 10 to 100 parts by mass of at least one resin per 100 parts by mass of the rubber components.
-
公开(公告)号：EP4092078A2
公开(公告)日：2022-11-23
申请号：EP22168521.7
申请日：2022-04-14
发明人： HIRAO, Shogo , KITAGO, Ryota , YOKOYAMA, Yuka , SATO, Daisuke , ISHINO, Soh
摘要： Provided are a cap tread and a passenger car tire which provide improved overall performance in terms of fuel economy and tensile strength at break while having good dimensional stability. Included is a cap tread of a passenger car tire, including a rubber composition A phase and a rubber composition B phase which are independent of and share a boundary with each other, the rubber composition A phase containing, per 100 parts by mass of the rubber components therein, 100 parts by mass or more of silica and 10 parts by mass or less of carbon black, the rubber composition B phase containing, per 100 parts by mass of the rubber components therein, 10 parts by mass or more of carbon black and 13 to 20 parts by mass of silica, the rubber composition B phase being divided by the rubber composition A phase to be independently present in the rubber composition A phase
-
公开(公告)号：EP3766708A1
公开(公告)日：2021-01-20
申请号：EP20180461.4
申请日：2020-06-17
发明人： HIRAO, Shogo
摘要： A tire having excellent rim shift resistance and a rim shift resistance evaluation method are provided. The pneumatic tire includes a pair of clinches and/or a pair of chafers, and is configured such that, when the tire is mounted onto a rim, the clinches and the chafers are in contact with the rim. The pair of clinches and the pair of chafers are formed from a clinch rubber or a fiber-coating rubber containing a vulcanized rubber having a dynamic friction coefficient not less than 1.0 as a main component. The dynamic friction coefficient is obtained by measuring a test piece having a thickness of 1 mm and a plan view area of 49 mm 2 , using a friction tester provided with a friction surface having a surface roughness similar to that of the rim, at a contact pressure of 2000 kPa and a sliding speed of 10 mm/s. The rim shift resistance evaluation method includes a step of preparing a test piece formed from a vulcanized rubber, a step of measuring a dynamic friction coefficient of the test piece, and a step of evaluating the vulcanized rubber using the dynamic friction coefficient as an index.
-
公开(公告)号：EP3763783A1
公开(公告)日：2021-01-13
申请号：EP19884889.7
申请日：2019-10-15
发明人： KITAGO, Ryota , YASUDA, Rie , HIRAO, Shogo
摘要： The purpose is to provide rubber compositions and pneumatic tires which have reduced changes in hardness over time. The present invention relates to a rubber composition containing a copolymer obtained by copolymerizing an aromatic vinyl compound and a conjugated diene compound, the rubber composition having a heat aging resistance index defined by equation (1) of 10 or less.
-
-
-
-
-
-
-
-
搜索结果
9 条记录 (耗时 0.014 秒)
