Pressure-sensitive adhesive composition

Patent metadata

Field	Value
Publication number	US-2016376480-A1
Application number	US-201414564560-A
Country	US
Kind code	A1
Filing date	Jun 19, 2014
Priority date	Jun 19, 2013
Publication date	Dec 29, 2016
Grant date	—

Abstract

Provided are a pressure-sensitive adhesive composition, a protective film, an optical device, and a display device. The pressure-sensitive adhesive composition may exhibit excellent storage stability, suitable low speed and high speed peel-off strengths after forming a crosslinking structure, and have an excellent balance between them. Accordingly, the pressure-sensitive adhesive composition may exhibit an excellent protective effect when applied to a protective film, may be easily peeled in a high speed peel-off and thus advantageous for a high speed process, and may exhibit an excellent antistatic characteristic.

First claim

What is claimed is:

1 . A pressure-sensitive adhesive composition, comprising:
a polymer comprising a polymerization unit of a monomer of Formula 1, a polymerization unit of a nitrogen-containing monomer, a polymerization unit of a first monomer represented by Formula 2, in which alkylene groups of A and B of Formula 2 have 1 to 3 carbon atoms, and a polymerization unit of a second monomer represented by Formula 2, in which alkylene groups of A and B of Formula 2 have 4 to 8 carbon atoms, in which a ratio (A/B) of a weight (A) of the polymerization unit of the first monomer and a weight (B) of the polymerization unit of the second monomer is more than 1; and an ionic compound:

where Q is hydrogen or an alkyl group, U is an alkylene group, Z is hydrogen, an alkyl group, or an aryl group, m is a number of 1 to 20, A and B are each independently an alkylene group, and n is a number of 0 to 10.

2 . The pressure sensitive adhesive composition according to claim 1 , wherein the nitrogen-containing monomer is dialkyl (meth)acrylamide.

3 . The pressure sensitive adhesive composition according to claim 1 , wherein the polymer comprises a polymerization units of 0.1 to 6.0 parts by weight of the monomer of Formula 1, 1 to 30 parts by weight of the nitrogen-containing monomer, 0.1 to 15 parts by weight of the first monomer and 0.1 to 5 parts by weight of the second monomer.

4 . The pressure sensitive adhesive composition according to claim 1 , further comprising a compound of Formula 3:

where M 1 to M 5 are each independently R 1 —N, (R 2 )(R 3 )—C, or (R 4 )(R 5 )—C, in which R 1 is a hydrogen atom, an alkyl group, or an alkoxy group, R 2 and R 3 are each independently an alkyl group, R 4 and R 5 are each independently a hydrogen atom or an alkyl group, L is an alkylene group or an alkylidene group, P is an alkyl group or a substituent of Formula 4. In Formula 3, at least one of M 2 to M 4 is R 1 —N, and M 1 , M 2 , M 3 , M 4 , or M 5 just adjacent to M 2 , M 3 , or M 4 that is R 1 -N may be (R 2 )(R 3 )—C, and

where M 6 to M 10 are each independently R 1 —N, (R 2 )(R 3 )—C, or (R 4 )(R 5 )—C, in which R 1 is a hydrogen atom, an alkyl group, or an alkoxy group, R 2 and R 3 are each independently an alkyl group, and R 4 and R 5 are each independently a hydrogen atom or an alkyl group (however, in Formula 4, at least one of M 7 to M 9 is R 1 -N, and M 6 , M 7 , M 8 , M 9 , or M 10 just adjacent to M 7 , M 8, or M 9 that is R 1 -N may be (R 2 )(R 3 )—C).

5 . The pressure sensitive adhesive composition according to claim 4 , wherein, in Formula 3, R 1 is a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 4 to 16 carbon atoms, R 2 and R 3 are each independently an alkyl group having 1 to 12 carbon atoms, and L is, for example, an alkylene group having 4 to 12 carbon atoms or an alkylidene group having 2 to 10 carbon atoms.

6 . The pressure sensitive adhesive composition according to claim 4 , wherein the compound of Formula 3 is bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate, propanedioic acid 2- l [[3,5-bis (1,1-dimethylethyl)-4-hydroxyphenyl]methyl]-2-butyl- 1,3-bis(1,2,2,6,6-pentamethyl-4-piperidinyl) ester, bis (2,2, 6,6- tetramethyl-4-piperidyl)sebacate, or bis- (1-octyloxy-2,2,6,6- tetramethyl-4-piperidinyl)sebacate.

7 . The pressure sensitive adhesive composition according to claim 4 , wherein the compound of Formula 3 is comprised at 0.01 to 10 parts by weight relative to 100 parts by weight of the polymer.

8 . The pressure sensitive adhesive composition according to claim 1 , further comprising an aliphatic isocyanate crosslinking agent.

9 . The pressure sensitive adhesive composition according to claim 8 , wherein the crosslinking agent comprises at least one selected from the group consisting of an aliphatic cyclic isocyanate compound and an aliphatic non-cyclic isocyanate compound.

10 . The pressure sensitive adhesive composition according to claim 9 , wherein the aliphatic cyclic isocyanate compound is an isocyanate compound such as isophorone diisocyanate, methylene dicyclohexyl diisocyanate, or cyclohexane diisocyanate, a dimer or trimer of the isocyanate compound, or a reaction product of the isocyanate compound with a polyol.

11 . The pressure sensitive adhesive composition according to claim 9 , wherein the aliphatic non-cyclic isocyanate compound is an alkylene diisocyanate compound having 1 to 20 carbon atoms; a dimer or trimer of the isocyanate compound; or a reaction product of the isocyanate compound and a polyol.

12 . The pressure sensitive adhesive composition according to claim 8 , wherein the crosslinking agent is comprised at 0.01 to 10 parts by weight relative to 100 parts by weight of the polymer.

13 . A surface protective film, comprising:
a surface protective base layer; and a pressure-sensitive adhesive layer formed on one or both surfaces of the base layer and comprising the pressure-sensitive adhesive composition of claim 1 in a crosslinked state.

14 . The surface protective film according to claim 13 , wherein a peel-off strength of a pressure-sensitive adhesive layer measured at a peeling angle of 180 degrees and a peeling speed of 0.3 m/min with respect to an adherend having a surface energy of 30 mN/m or less is 1 to 40 gf/25 mm.

15 . The surface protective film according to claim 13 , wherein a peel-off strength of a pressure-sensitive adhesive layer measured at a peeling angle of 180 degrees and a peeling speed of 30 m/min with respect to an adherend having a surface energy of 30 mN/m or less is 10 to 300 gf/25 mm.

16 . An optical device in which the protective film of claim 13 is adhered to a surface thereof to be peeled.

17 . The optical device according to claim 16 , wherein the surface to which the protective film is adhered has a surface energy of 30 mN/m or less.

18 . A display device, comprising the optical device of claim 16 .

Assignees

• Lg Chemical Ltd

Inventors

• Bae Jeong Sik
• Yoon Sung Soo
• Kim Kee Young

Classifications

• C09J7/385

  Acrylic polymers · CPC title

• B32B2307/40

  having particular optical properties · CPC title

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• C09D133/066

  containing -OH groups · CPC title

• B32B2307/50

  having particular mechanical properties · CPC title