Method for producing block copolymer
AssigneeNippon Soda Co., Ltd.
InventorsShota Osumi, Toshifumi Nosaki, Masahiro Umezawa
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Abstract
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.
Claims14
A method for producing a block copolymer, the method comprising:
- a step (A) of polymerizing a vinyl aromatic monomer in a mixed solvent comprising at least one nonpolar solvent selected from methylcyclohexane and methylcyclopentane and an aprotic polar solvent by using an anionic polymerization initiator, at −5° C. to 35° C.;
- and
- a step (B) of adding a conjugated diene monomer for further polymerization at −5° C. to 35° C. after the step (A),
- wherein
- the aprotic polar solvent amount is 5 to 20 parts by weight with respect to 100 parts by weight of the at least one nonpolar solvent selected from methylcyclohexane and methylcyclopentane.
A method for producing a block copolymer, the method comprising:
- a step (A) of polymerizing a vinyl aromatic monomer in a mixed solvent comprising at least one nonpolar solvent selected from methylcyclohexane and methylcyclopentane and an aprotic polar solvent by using an anionic polymerization initiator, at −5° C. to 35° C.;
- 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),
- wherein
- the aprotic polar solvent amount is 5 to 20 parts by weight with respect to 100 parts by weight of the at least one nonpolar solvent selected from methylcyclohexane and methylcyclopentane.
Dependencies are inferred from the claim text.