Method for producing a hydrogenated block copolymer, hydrogenated block copolymer obtained by said production method and composition thereof

摘要

The present invention relates to a method for producing a hydrogenated block copolymer, comprises the steps of: (a) forming a block copolymer by allowing a living polymer having a specific structure to react with a bis-silane coupling agent having a specific structure; (b) hydrogenating the block copolymer to form a hydrogenated block copolymer; and (c) isolating the resultant hydrogenated block copolymer, in which the number of functional groups derived from the coupling agent in the hydrogenated block copolymer isolated in the step (c) is 1.5 or less per block copolymer molecule; a hydrogenated block copolymer obtained by the method; and a composition containing the hydrogenated block copolymer.

主权项

1. A method for producing a hydrogenated block copolymer, the method comprising:
(A) reacting a living anionic polymer of formula (I):
P—X  (I), wherein P is a copolymer chain comprising, in reacted form, an aromatic vinyl compound polymer block (A) and a conjugated diene polymer block (B) and X is an active terminal of the living anionic polymer, with a coupling agent of formula (II):
R1mY3-mSi-A-SiY3-mR1m  (II), wherein each R1 is independently an aryl group having 6 to 12 carbon atoms, a linear or branched alkyl group having 1 to 12 carbon atoms, or a hydrogen atom, each Y is independently a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkoxy group, a carboxyl group, or a carboxylic acid ester group, A is a single bond or a linear alkylene group having 1 to 20 carbon atoms, and m is 0 or 1, to obtain a block copolymer, wherein the molar ratio of the coupling agent to the active terminal of the living polymer is from 0.1 to 0.5; (B) hydrogenating the block copolymer, to form a hydrogenated block copolymer; and (C) isolating the hydrogenated block copolymer, wherein a number of functional groups derived from the coupling agent in the hydrogenated block copolymer isolated in (C) is 1.5 or less per block copolymer molecule.