RUBBER COMPOSITION FOR TIRES, AND PNEUMATIC TIRE

• Main Author: NISHIKAWA YUMA
• Format: Patent
• Language: English; Japanese
• Published: 08.08.2019
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DEVICES OR ARRANGEMENTS RELATED TO TYRES; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; VEHICLE TYRES; VEHICLES IN GENERAL

To improve processability, wear resistance and tear resistance of a rubber composition containing small particle size silica.SOLUTION: A rubber composition for tires contains: a diene rubber; silica having a nitrogen adsorption specific surface area of 200 m/g or more; and an ether ester which is a polyoxyalkylene glycerol fatty acid ester represented by general formula (1) and is a monoester and/or a diester. In the formula (1), R, Rand Reach represent a hydrogen atom or an acyl group having a C6-30 saturated or unsaturated alkyl group; at least one of R, Rand Ris an acyl group; a, b and c each represent an average addition molar number; and 60 mass% or more of (RO), (RO)and (RO)consist of oxyethylene groups.SELECTED DRAWING: None 【課題】小粒径シリカを配合したゴム組成物において加工性と耐摩耗性と耐引き裂き性を改良する。【解決手段】ジエン系ゴム、窒素吸着比表面積が２００ｍ２／ｇ以上のシリカ、及び、一般式（１）で表されるポリオキシアルキレングリセリン脂肪酸エステルであってモノエステル及び／又はジエステルであるエーテルエステルを含むタイヤ用ゴム組成物である。式（１）中、Ｒ１、Ｒ２、Ｒ３は水素原子、又は炭素数６〜３０の飽和もしくは不飽和のアルキル基を持つアシル基を表し、Ｒ１、Ｒ２及びＲ３のうち少なくとも１つはアシル基であり、ａ、ｂ、ｃは平均付加モル数を表し、（Ｒ４Ｏ）ａ、（Ｒ５Ｏ）ｂ及び（Ｒ６Ｏ）ｃの６０質量％以上がオキシエチレン基からなる。【選択図】なし