Thermoplastic polymer composition, layered body, and protective film

Patent metadata

Field	Value
Publication number	US-2016243799-A1
Application number	US-201415025002-A
Country	US
Kind code	A1
Filing date	Sep 24, 2014
Priority date	Sep 25, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

Provided is a thermoplastic polymer composition containing an aromatic vinyl-based block copolymer (a-1) having a number average molecular weight of 30,000 to 200,000, the aromatic vinyl-based block copolymer containing a polymer block F containing a structural unit derived from an aromatic vinyl-based monomer as a main component and a hydrogenated or non-hydrogenated polymer block G containing a structural unit derived from a conjugated diene monomer or an isobutylene monomer as a main component; an acrylic polymer (a-2); an olefin-based polymer containing polar groups (a-3); and a softening agent (a-4), at the proportions that satisfy the following Expressions (1) to (3):
0.05≦ W (a-2) /W (a-1) ≦9   (1)

0.1< W (a-3) /( W (a-1) +W (a-2) +W (a-3) +W (a-4) )≦0.9   (2), and

0≦ W (a-4) /( W (a-1) +W (a-2) +W (a-3) +W (a-4) )≦0.5   (3)

wherein W (a-1) , W (a-2) , W (a-3) and W (a- 4) represent the contents (on a mass basis) of the aromatic vinyl-based block copolymer (a-1), acrylic polymer (a-2), olefin-based polymer containing polar groups (a-3) and softening agent (a-4), respectively, in the thermoplastic polymer composition.

First claim

1 . A thermoplastic polymer composition comprising:
an aromatic vinyl-based block copolymer (a-1) having a number average molecular weight of 30,000 to 200,000, the aromatic vinyl based block copolymer (a-1) containing a polymer block F containing a structural unit derived from an aromatic vinyl-based monomer as a main component, and a hydrogenated or non-hydrogenated polymer block G containing a structural unit derived from a conjugated diene monomer or an isobutylene monomer as a main component; an acrylic polymer (a-2); an olefin-based polymer containing polar groups (a-3); and a softening agent (a-4),
at the proportions satisfying the following Expressions (1) to (3):
0.05 ≦W (a-2) /W (a-1) ≦9   (1)

0.1 <W (a-3) /( W (a-1) +W (a-2) +W (a-3) +W (a-4) )≦0.9   (2), and

0 ≦W (a-4) /( W (a-1) +W (a-2) +W (a-3) +W (a-4) )≦0.5   (3)

wherein W (a-1) , W (a-2) , W (a-3) and W (a-4) represent the contents (on a mass basis) of the aromatic vinyl-based block copolymer (a-1), acrylic polymer (a-2), olefin-based polymer containing polar groups (a-3) and softening agent (a-4), respectively, in the thermoplastic polymer composition.

2 . The thermoplastic polymer composition according to claim 1 , wherein the ratio between the shear viscosity ηEa (Pa·s) at a shear velocity 1 (1/s) measured at 210° C. and the shear viscosity ηEb (Pa·s) at a shear velocity 100 (1/s) measured at 210° C., (ηEa/ηEb), is 10 or less.

3 . The thermoplastic polymer composition according to claim 1 , wherein the aromatic vinyl-based block copolymer (a-1) includes a polymer block F having a number average molecular weight of 1,000 to 50,000 and containing a structural unit derived from an aromatic vinyl-based monomer as a main component; and a polymer block G containing a polymer block g1, which is a polymer block having a number average molecular weight of 1,000 to 30,000 and in which the content of a 1,4-bond structural unit derived from a conjugated diene monomer that constitutes the polymer block is less than 30 mol %, and a polymer block g2, which is a polymer block having a number average molecular weight of 25,000 to 190,000 and in which the content of a 1,4-bond structural unit derived from a conjugated diene monomer that constitutes the polymer block is 30 mol % or more, and the aromatic vinyl-based block copolymer (a-1) contains at least one (F-g1-g2) structure.

4 . The thermoplastic polymer composition according to claim 1 , wherein the aromatic vinyl-based monomer is α-methylstyrene.

5 . The thermoplastic polymer composition according to claim 1 , wherein the olefin-based polymer containing polar groups (a-3) is at least one selected from an ethylene-vinyl acetate copolymer, an ethylene-(meth)acrylic acid ester copolymer, and an ethylene-(meth)acrylic acid copolymer.

6 . A laminate comprising:
a layer (A) formed from the thermoplastic polymer composition according to claim 1 ; a pressure-sensitive adhesive layer (B) containing an acrylic pressure-sensitive adhesive; and a substrate layer (C) containing a polyolefin-based polymer, the laminate having these layers laminated in the order of (B)-(A)-(C).

7 . The laminate according to claim 6 , wherein the acrylic pressure-sensitive adhesive contains an acrylic block copolymer (b-1) having at least one polymer block (I-1) composed of a structural unit derived from a methacrylic acid ester; and at least one polymer block (I-2) composed of a structural unit derived from an acrylic acid ester.

8 . The laminate according to claim 7 , wherein the content of the polymer block (I-1) in the acrylic block copolymer (b-1) is 5% by mass to 50% by mass.

9 . The laminate according to claim 7 , wherein the structural unit derived from an acrylic acid ester that constitutes the polymer block (I-2) is derived from an acrylic acid ester (i-1) represented by formula: CH 2 ═CH—COOR 1 (P) (wherein R 1 represents an organic group having 4 to 6 carbon atoms) and an acrylic acid ester (i-2) represented by formula: CH 2 ═CH—COOR 2 (Q) (wherein R 2 represents an organic group having 7 to 12 carbon atoms), and the mass ratio of the acrylic acid ester (i-1) and the acrylic acid ester (i-2), [(i-1)/(i-2)], is 90/10 to 10/90.

10 . The laminate according to claim 6 , wherein the ratio between the shear viscosity ηEx (Pa·s) at a shear velocity 1 (1/s) measured at 210° C. and the shear viscosity ηEy (Pa·s) at a shear velocity 100 (1/s) measured at 210° C., (ηEx/ηEy), of the acrylic pressure-sensitive adhesive is 25 or less.

11 . The laminate according to claim 6 , wherein the absolute value of the difference between the ratio (ηEa/ηEb) between the shear viscosity ηEa (Pa·s) at a shear velocity 1 (1/s) measured at 210° C. and the shear viscosity ηEb (Pa·s) at a shear velocity 100 (1/s) measured at 210° C. of the thermoplastic polymer composition; and the ratio (ηEx/ηEy) between the shear viscosity ηEx (Pa·s) at a shear velocity 1 (1/s) measured at 210° C. and the shear viscosity ηEy (Pa·s) at a shear velocity 100 (Vs) measured at 210° C. of the acrylic pressure-sensitive adhesive, is 10 or less.

12 . The laminate according to claim 6 , wherein the polyolefin-based polymer that constitutes the substrate layer (C) is a polypropylene-based polymer.

13 . The laminate according to claim 6 , wherein the layers of (A) to (C) have been laminated according to a co-extrusion molding processing method.

14 . A protective film comprising the laminate according to claim 6 .

Assignees

• Kuraray Co

Inventors

• Oshima Hiroshi
• Zento Toshiyuki
• Fukuhara Naoto
• Oshita Shinya

Classifications

• B32B27/308

  comprising acrylic (co)polymers · CPC title

• B32B2405/00

  Adhesive articles, e.g. adhesive tapes · CPC title

• B32B27/302

  comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers · CPC title

• C09J7/29

  Laminated material (metallised plastics C09J7/22) · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title