Modified acrylic block copolymer, method for producing same, and intended use of same

Patent metadata

Field	Value
Publication number	US-2016208149-A1
Application number	US-201414915526-A
Country	US
Kind code	A1
Filing date	Aug 29, 2014
Priority date	Aug 30, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A modified acrylic block copolymer is obtained by a method comprising subjecting a block copolymer (C) to a reaction with an amine compound, wherein the block copolymer comprises a polymer block (A) comprising a (meth)acrylic acid ester unit (a) and a polymer block (B′) comprising a (meth)acrylic acid ester unit (b′), the (meth)acrylic acid ester unit (a) is structurally different from the (meth)acrylic acid ester unit (b′), thereby partly or entirely converting the (meth)acrylic acid ester unit (b′) into at least one selected from the group consisting of an N-substituted (meth)acrylamide unit (d), a (meth)acrylic acid unit (c), and an N-substituted bis((meth)acryl)amide unit (e).

First claim

1 .- 19 . (canceled)

20 . A modified acrylic block copolymer, comprising:
a polymer block (A) comprising a (meth)acrylic acid ester unit (a), and a polymer block (B) comprising an N-substituted (meth)acrylamide unit (d); wherein a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) is 1.0 to 1.5.

21 . The modified acrylic block copolymer according to claim 20 , wherein the (meth)acrylic acid ester unit (a) is an alkyl (meth)acrylate unit that is not a methyl (meth)acrylate unit.

22 . The modified acrylic block copolymer according to claim 20 , wherein the polymer block (B) further comprises a (meth)acrylic acid ester unit (b) and/or a (meth)acrylic acid unit (c), and the (meth)acrylic acid ester unit (b) is structurally different from the (meth)acrylic acid ester unit (a).

23 . The modified acrylic block copolymer according to claim 22 , wherein the (meth)acrylic acid ester unit (b) is a methyl (meth)acrylate unit.

24 . The modified acrylic block copolymer according to claim 22 , the polymer block (B) satisfying the following relationships:
5<([ d]+[c ])<90; and 0.01<[ d]/[c]< 0.075×([ d]+[c ])+4;
wherein the [d] is a molar amount of the N-substituted (meth)acrylamide unit (d) relative to 100 mol of total molar amount of units constituting the polymer block (B) and the [c] is a molar amount of the (meth)acrylic acid unit (c) relative to 100 mol of total molar amount of units constituting the polymer block (B).

25 . The modified acrylic block copolymer according to claim 20 , wherein the N-substituted (meth)acrylamide unit (d) is a unit represented by Formula (Ia) or (Ib):

in Formulae (Ia) and (Ib), each of R 1 , R 2 , and R 3 independently represents an alkyl group optionally having a substituent, a silyl group, an amino group optionally having a substituent, a silanyl group, an alicyclic group optionally having a substituent, a heterocyclic group optionally having a substituent, or an aromatic ring group optionally having a substituent, R 1 and R 2 together with the nitrogen atom to which they are bound optionally form a ring, and each R 4 independently represents a hydrogen atom or a methyl group.

26 . The modified acrylic block copolymer according to claim 20 , wherein the polymer block (B) further comprises an N-substituted bis((meth)acryl)amide unit (e).

27 . The modified acrylic block copolymer according to claim 26 , wherein the N-substituted bis((meth)acryl)amide unit (e) is a unit represented by Formula (II):

in Formula (II), each R 3 independently represents an alkyl group optionally having a substituent, a silyl group, an amino group optionally having a substituent, a silanyl group, an alicyclic group optionally having a substituent, a heterocyclic group optionally having a substituent, or an aromatic ring group optionally having a substituent, and each of R 5 and R 6 independently represents a hydrogen atom or a methyl group.

28 . A method for producing a modified acrylic block copolymer, the method comprising
subjecting a block copolymer (C) to a reaction in the presence of an amine compound, wherein the block polymer (C) comprises a polymer block (A) comprising a (meth)acrylic acid ester unit (a) and a polymer block (B′) comprising a (meth)acrylic acid ester unit (b′), the (meth)acrylic acid ester unit (a) is structurally different from the (meth)acrylic acid ester unit (b′), thereby partly or entirely converting the (meth)acrylic acid ester unit (b′) into at least one selected from the group consisting of an N-substituted (meth)acrylamide unit (d), a (meth)acrylic acid unit (c), and an N-substituted bis((meth)acryl)amide unit (e).

29 . The method for producing a modified acrylic block copolymer according to claim 28 , wherein the converting is performed by controlling a temperature of a mixture of the block copolymer (C) and the amine compound to be not less than a softening point of the block copolymer (C).

30 . The method for producing a modified acrylic block copolymer according to claim 28 , wherein the amine compound is a primary amine or a secondary amine.

31 . The method for producing a modified acrylic block copolymer according to claim 28 , wherein the amine compound is a primary amine represented by Formula (1) or a secondary amine represented by Formula (2):

in Formulae (1) and (2), each of R 1 , R 2 and R 3 independently represents an alkyl group optionally having a substituent, a silyl group, an amino group optionally having a substituent, a silanyl group, an alicyclic group optionally having a substituent, a heterocyclic group optionally having a substituent, or an aromatic ring group optionally having a substituent, and R 1 and R 2 together with the nitrogen atom to which they are bound optionally form a ring.

32 . The method for producing a modified acrylic block copolymer according to claim 28 , wherein the (meth)acrylic acid ester unit (a) is an alkyl (meth)acrylate unit that is not a methyl (meth)acrylate unit.

33 . The method for producing a modified acrylic block copolymer according to claim 28 , wherein the (meth)acrylic acid ester unit (b′) is a methyl (meth)acrylate unit.

34 . The method for producing a modified acrylic block copolymer according to claim 28 , wherein a molar amount of the amine compound used in the reaction is 2 mol to 100 mol relative to 100 mol of the (meth)acrylic acid ester unit (b′).

35 . An acrylic adhesive comprising the modified acrylic block copolymer according to claim 20 .

36 . The acrylic adhesive according to claim 25 , further comprising a tackifier resin in an amount of not less than 1 part by mass and not more than 400 parts by mass relative to 100 parts by mass of the modified acrylic block copolymer.

37 . The acrylic adhesive according to claim 25 , further comprising a plasticizer in an amount of not less than 1 part by mass and not more than 400 parts by mass relative to 100 parts by mass of the modified acrylic block copolymer.

38 . An adhesive product comprising an adhesive layer comprising the acrylic adhesive according to claim 25 .

Assignees

• Kuraray Co

Inventors

• Kawasaki Masahiro
• Okamoto Isamu
• Nakamura Eiji

Classifications

• C09J153/005 Primary

  Modified block copolymers · CPC title

• C08F8/32

  by reaction with amines · CPC title

• C08F293/00

  Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule (on to polymers modified by introduction of unsaturated end groups C08F290/02) · CPC title

• C09J133/24

  Homopolymers or copolymers of amides or imides · CPC title

• C09J133/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title