Pressure-sensitive adhesive composition

Patent metadata

Field	Value
Publication number	US-2016369136-A1
Application number	US-201615181517-A
Country	US
Kind code	A1
Filing date	Jun 14, 2016
Priority date	Jun 16, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

Provided is a PSA composition for forming a PSA comprising a (meth)acrylic polymer, comprising, as monomeric components constituting the (meth)acrylic polymer: (A) a C 2-18 alkyl (meth)acrylate, (B) an alicyclic monomer, and (C) a monomer having at least either a hydroxyl group or a carboxyl group. The average number of carbons of alkyl group in the (A) is 8 or less. The monomeric components comprise the (C) at 3% by weight or greater while the weights Wb and Wc of the (B) and (C) satisfy a relationship 0.8≦Wb/Wc.

First claim

1 . A pressure-sensitive adhesive composition for forming a pressure-sensitive adhesive comprising a (meth)acrylic polymer, comprising, as monomeric components constituting the (meth)acrylic polymer,
(A) an alkyl (meth)acrylate having an alkyl group with 2 to 18 carbons at an ester end, (B) an alicyclic monomer, and (C) a monomer having at least either a hydroxyl group or a carboxyl group, wherein: the alkyl group in the (A) has an average 8 or less carbons, the monomeric components comprise the (C) at 3% by weight or greater, and the (B) and (C) in the monomeric components have weights Wb and Wc, respectively, satisfying a relationship 0.8≦Wb/Wc.

2 . The pressure-sensitive adhesive composition according to claim 1 , wherein the (A) comprises an alkyl (meth)acrylate having an alkyl group with up to 5 carbons at the ester end.

3 . The pressure-sensitive adhesive composition according to claim 1 , wherein the average number of carbons of the alkyl group in the (A) is less than 8.

4 . The pressure-sensitive adhesive composition according to claim 1 , wherein the monomeric components comprise the (B) and (C) at 15 to 85% by weight in total.

5 . The pressure-sensitive adhesive composition according to claim 1 , wherein Wb and Wc satisfy a relationship 1≦Wb/Wc≦5.

6 . The pressure-sensitive adhesive composition according to claim 1 , wherein the (C) comprises a monomer having a hydroxyl group.

7 . The pressure-sensitive adhesive composition according to claim 1 , wherein a copolymer corresponding to the composition of the monomeric components has a glass transition temperature higher than −45° C., but no higher than −20° C.

8 . The pressure-sensitive adhesive composition according to claim 1 , wherein the Tg value of the copolymer corresponding to the composition of the monomeric components is higher by 8° C. or more than the Tg value of a copolymer corresponding to the composition of the monomeric components excluding the component (B).

9 . The pressure-sensitive adhesive composition according to claim 1 , wherein the monomeric components comprises a polyfunctional monomer.

10 . The pressure-sensitive adhesive composition according to claim 1 comprising a polymerized product of the monomeric components.

11 . The pressure-sensitive adhesive composition according to claim 1 comprising a partially-polymerized product of a monomer mixture comprising at least some of the monomeric components.

12 . The pressure-sensitive adhesive composition according to claim 1 further comprising a photopolymerization initiator.

13 . A pressure-sensitive adhesive layer comprising a (meth)acrylic polymer, wherein the monomeric components constituting the (meth)acrylic polymer comprises:
(A) an alkyl (meth)acrylate having an alkyl group with 2 to 18 carbons at an ester end; (B) an alicyclic monomer, and (C) a monomer having at least either a hydroxyl group or a carboxyl group; the alkyl group in the (A) has an average 8 or less carbons, the monomeric components comprise the (C) at 3% by weight or greater, and the (B) and (C) in the monomeric components have weights Wb and Wc, respectively, satisfying a relationship 0.8≦Wb/Wc.

14 . The pressure-sensitive adhesive layer according to claim 13 , wherein the thickness of the pressure-sensitive adhesive layer is 2 μm or greater, but 150 μm or less.

15 . The pressure-sensitive adhesive layer according to claim 13 , wherein the (A) comprises an alkyl (meth)acrylate having an alkyl group with up to 5 carbons at the ester end.

16 . The pressure-sensitive adhesive layer according to claim 13 , wherein the average number of carbons of the alkyl group in the (A) is less than 8.

17 . The pressure-sensitive adhesive layer according to claim 13 , wherein the monomeric components comprise the (B) and (C) at 15 to 85% by weight in total.

18 . The pressure-sensitive adhesive layer according to claim 13 , wherein Wb and Wc satisfy a relationship 1≦Wb/Wc≦5.

19 . The pressure-sensitive adhesive layer according to claim 13 , wherein the (C) comprises a monomer having a hydroxyl group.

20 . A pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer according to claim 13 at least on one face of a support.

Assignees

• Nitto Denko Corp

Inventors

• Suzuki Tatsuya
• Kamiya Katsuhiko
• Shigetomi Kiyoe
• Hoshino Shinji

Classifications

• C09J7/20

  characterised by their carriers · CPC title

• C09J133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09J7/385 Primary

  Acrylic polymers · CPC title

• C08F220/1818

  C13or longer chain (meth)acrylate, e.g. stearyl (meth)acrylate · CPC title

• C08F220/18 Primary

  with acrylic or methacrylic acids · CPC title