RUBBER COMPOSITION AND MOLDED PRODUCT

• Main Author: ABE SHOTA
• Format: Patent
• Language: English; Japanese
• Published: 22.02.2021
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

To provide a rubber composition excellent in rubber elasticity, particularly tensile permanent set and to provide a molded product produced by crosslinking the rubber composition.SOLUTION: The rubber composition contains (A) a liquid modified ethylene-based random copolymer and (B) a rubber component. The liquid modified ethylene-based random copolymer (A) is a copolymer having an unsaturated silane compound component graft-copolymerized with (a0) an ethylene-based random copolymer in which the copolymer (a0) has a structural unit (30 to 90 mol%) derived from ethylene and a structural unit derived from a C3 to C20 α-olefin and has an intrinsic viscosity [η] of 0.01 to 0.50 dl/g; and the unsaturated silane compound component is a 2-20C unsaturated silane compound and has a grafting ratio of 0.2 to 300 pts.mass based on 100 pts.mass of the copolymer (a0).SELECTED DRAWING: None 【課題】ゴム弾性、特に引張永久歪みに優れるゴム組成物およびこれを架橋して得られる成形体を提供すること。【解決手段】液状変性エチレン系ランダム共重合体（Ａ）とゴム成分（Ｂ）とを含有し、前記液状変性エチレン系ランダム共重合体（Ａ）が、エチレン系ランダム共重合体（ａ０）に不飽和シラン化合物成分がグラフト共重合された共重合体であって、共重合体（ａ０）は、エチレンから導かれる構造単位（３０〜９０モル％）と、Ｃ３−Ｃ２０α−オレフィンから導かれる構造単位とを有し、且つ０．０１〜０．５０ｄｌ／ｇの極限粘度［η］を有し、前記不飽和シラン化合物成分は、炭素数が２〜２０の不飽和シラン化合物であり、そのグラフト割合は共重合体（ａ０）１００質量部に対して０．２〜３００質量部である、ゴム組成物。【選択図】なし