Provided is a polyfunctional vinyl aromatic copolymer having reactivity and solubility that can be used for manufacturing a copolymer rubber and a copolymer rubber material having processability, strength and homogeneity obtained therefrom. The polyfunctional vinyl aromatic copolymer includes: 0.5 mol% or more and 40 mol% or less of a structural unit (a) derived from a divinyl aromatic compound and 60 mol% or more and 99.5 mol% or less of a structural unit (b) derived from a monovinyl aromatic compound, in which at least some of the structural units (a) are a crosslinked structural unit (a2) represented by the following Formula (2) and a vinyl-group-containing structural unit (a1) represented by the following Formula (1):(in the formulas, R1's independently represent an aromatic hydrocarbon group having 6 to 30 carbon atoms), whereinthe molar fraction of the crosslinked structural unit (a2) with respect to the structural unit (a) is within a range of 0.05 to 0.50, the molar fraction of the vinyl-group-containing structural unit (a1) with respect to the total amount of the structural units (a) and (b) is within a range of 0.001 to 0.35, the number average molecular weight Mn of the polyfunctional vinyl aromatic copolymer is 1,000 to 50,000, and the molecular weight distribution (Mw/Mn) represented by the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 8.0 or less.


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    Title :

    多官能ビニル芳香族共重合体及びその製造方法、それから得られる共重合体ゴム、ゴム組成物、ゴム架橋物及びタイヤ部材


    Publication date :

    2024-04-22


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    C08F MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS , Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind / B60C VEHICLE TYRES , Fahrzeugreifen / C08K Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe , USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS / C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen