RUBBER CROSSLINKED PRODUCT

• Main Authors: UEDA HIDEYORI, OKUNO SHINGO
• Format: Patent
• Language: English; Japanese
• Published: 05.09.2023
• 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; TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS; TYRE CHANGING OR REPAIRING; TYRE INFLATION; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; VEHICLE TYRES; VEHICLES IN GENERAL

To provide a rubber crosslinked product excellent in wet grip performance, low heat generating property and abrasion resistance.SOLUTION: There is provided a rubber crosslinked product which is obtained by crosslinking a rubber composition comprising a conjugated-diene-based rubber (A) having an aromatic vinyl monomer unit content of 20 wt.% or more, 5 wt.% or less of a rubber (B) and an inorganic filler (C), wherein when the loss tangent of the cross-linked material is measured under specific conditions, a loss tangent value Ka (m) of a non-interfacial component forming a part other than an interface with the inorganic filler (C) of a crosslinked rubber phase (a) derived from the conjugated-diene-based rubber (A), a loss tangent value Ka (i) of an interfacial component forming an interface with the inorganic filler (C) of the crosslinked rubber phase (a), a loss tangent value Kb (m) of a non-interfacial component forming a part other than an interface with the inorganic filler (C) of a crosslinked rubber phase (b) derived from the rubber (B) and a loss tangent value Kb (i) of an interfacial component forming an interface with the inorganic filler (C) of the crosslinked rubber phase (b) have a specific relationship.SELECTED DRAWING: None 【課題】ウエットグリップ性、低発熱性および耐摩耗性に優れたゴム架橋物を提供する。【解決手段】芳香族ビニル単量体単位の含有割合が２０重量％以上である共役ジエン系ゴム（Ａ）と、５重量％以下であるゴム（Ｂ）と、無機充填剤（Ｃ）とを含有するゴム組成物を架橋してなるゴム架橋物であって、特定の条件で該架橋物の損失正接を測定した際の、共役ジエン系ゴム（Ａ）由来の架橋ゴム相（ａ）のうち、無機充填剤（Ｃ）との界面以外の部分を形成する非界面成分の損失正接値Ｋａ（ｍ）と、架橋ゴム相（ａ）のうち、無機充填剤（Ｃ）との界面を形成する界面成分の損失正接値Ｋａ（ｉ）と、ゴム（Ｂ）由来の架橋ゴム相（ｂ）のうち、無機充填剤（Ｃ）との界面以外の部分を形成する非界面成分の損失正接値Ｋｂ（ｍ）と、架橋ゴム相（ｂ）のうち、無機充填剤（Ｃ）との界面を形成する界面成分の損失正接値Ｋｂ（ｉ）とが特定の関係にあるゴム架橋物を提供する。【選択図】なし