METHOD FOR PRODUCING BLOCK COPOLYMER

A method for producing a block copolymer that includes a step (A) of polymerizing a vinyl aromatic monomer at −5° C. to 35° C. in a mixed solvent including at least one nonpolar solvent selected from methylcyclohexane and methylcyclopentane and an aprotic polar solvent using an anionic polymerizatio...

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Bibliographische Detailangaben
Hauptverfasser:	NOSAKI, Toshifumi, OSUMI, Shota, UMEZAWA, Masahiro
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A method for producing a block copolymer that includes a step (A) of polymerizing a vinyl aromatic monomer at −5° C. to 35° C. in a mixed solvent including at least one nonpolar solvent selected from methylcyclohexane and methylcyclopentane and an aprotic polar solvent using an anionic polymerization initiator; a step (B) of adding a conjugated diene monomer for further polymerization at −5° C. to 35° C. after the step (A); and a step (C) of adding a vinyl aromatic monomer for further polymerization at −5° C. to 35° C. after the step (B) if necessary.