Pressure-sensitive adhesive composition, polarizing plate, and optical member
The present application relates to a photocurable solventless pressure-sensitive adhesive composition, a pressure-sensitive adhesive polarizing plate and a display device. According to the present application, a pressure-sensitive adhesive composition, a polarizing plate and a liquid crystal device, which have excellent durability and antistatic abilities, can be provided.
1. A pressure-sensitive adhesive polarizing plate comprising:
a polarizing film; and
a pressure-sensitive adhesive layer formed on at least one side of the polarizing film, wherein the pressure-sensitive adhesive layer is a photocured product of a solventless photocurable pressure-sensitive adhesive composition, and
the solventless photocurable pressure-sensitive adhesive composition comprises:
40 parts by weight to 95 parts by weight of: a first resin having a weight average molecular weight in a range of 1,000,000 to 3,500,000, and comprising polymerized units derived from a (meth)acrylic acid ester monomer;
5 parts by weight to 60 parts by weight of: a second resin which is different from the first resin, wherein the second resin has a weight average molecular weight smaller than 1,000,000, and comprises polymerized units derived from 50 parts by weight to 90 parts by weight of a (meth)acrylic acid ester monomer and 10 to 50 parts by weight of a monomer represented by Formula 1 below:
wherein, Q is hydrogen or an alkyl group having 1 to 20 carbon atoms, each U is independently an alkylene having 1 to 4 carbon atoms, m is a number in a range of 1 to 15, and Z is hydrogen, an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 25 carbon atoms;
a bifunctional urethane acrylate oligomer having two acrylate groups at the terminals thereof, in a content of 0.01 to 5 parts by weight relative to 100 parts by weight of the total content of the first resin and the second resin; and
an antistatic agent which is an organic salt, in a content of 0.5 to 5 parts by weight relative to 100 parts by weight of the total of the first resin and the second resin, having a uniform surface distribution in the composition.
2. The pressure-sensitive adhesive polarizing plate according to claim 1 , wherein Z is hydrogen or an alkyl group having 1 to 20 carbon atoms.
3. The pressure-sensitive adhesive polarizing plate according to claim 1 , when the first resin further comprises polymerized units derived from a compound capable of hydrogen bonding.
4. The pressure-sensitive adhesive polarizing plate according to claim 3 , wherein the compound capable of hydrogen bonding has a hydroxyl group, a carboxyl group, a urethane group, an amine group or an amide group.
5. The pressure-sensitive adhesive polarizing plate according to claim 4 , wherein the first resin comprises 30 parts by weight or less of polymerized units derived from the compound capable of hydrogen bonding.
6. The pressure-sensitive adhesive polarizing plate according to claim 1 , wherein the solventless photocurable pressure-sensitive adhesive composition further comprises a multifunctional (meth)acrylate and a photoinitiator.
7. The pressure-sensitive adhesive polarizing plate according to claim 6 , wherein in the solventless photocurable pressure-sensitive adhesive composition, the multifunctional (meth)acrylate is present in an amount of 5 parts by weight or less relative to 100 parts by weight of the total amount of the first resin and the second resin.
8. The pressure-sensitive adhesive polarizing plate according to claim 6 , wherein in the solventless photocurable pressure-sensitive adhesive composition, the photoinitiator is present in an amount of 5 parts by weight or less relative to 100 parts by weight of the total amount of the first resin and the second resin.
9. The pressure-sensitive adhesive polarizing plate according to claim 1 , wherein the pressure-sensitive adhesive layer has a surface resistance of 1×10 10 Ω/sq, and peel force in a range of 300 to 700 gf/inch, as measured at a speed of 300 mm/min and an angle of 90° when peeled from a glass base material.
10. A display device comprising a liquid crystal panel that the pressure-sensitive adhesive polarizing plate according to claim 1 is attached to one side or both sides thereof.
11. The display device according to claim 10 , wherein the liquid crystal panel comprises a first substrate, a pixel electrode, a first alignment film, a liquid crystal layer, a second alignment film, a common electrode and a second substrate.
12. The pressure-sensitive adhesive polarizing plate according to claim 1 , wherein the polarizing film comprised a polyvinyl alcohol-based resin having a gelation degree of about 85 mol % to about 100 mol %, and a polymerization degree of about 1,000 to about 10,000.
13. A solventless photocurable pressure-sensitive adhesive composition comprising:
40 parts by weight to 95 parts by weight of: a first resin having a weight average molecular weight in a range of 1,000,000 to 3,500,000, and comprising Polymerized units derived from a (meth)acrylic acid ester monomer;
5 parts by weight to 60 parts by weight of: a second resin which is different from the first resin, wherein the second resin has a weight average molecular weight smaller than 1,000,000, and comprises polymerized units of 50 parts by weight to 90 parts by weight of a (meth)acrylic acid ester monomer and polymerized units of 10 to 50 parts by weight of a monomer represented by Formula 1 below:
wherein, Q is hydrogen or an alkyl group having 1 to 20 carbon atoms, each U is independently an alkylene having 1 to 4 carbon atoms, m is a number in a range of 1 to 15, and Z is hydrogen, an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 25 carbon atoms;
a bifunctional urethane acrylate oligomer having two acrylate groups at the terminals thereof, in a content of 0.01 to 5 parts by weight relative to 100 parts by weight of the total content of the first resin and the second resin; and
an antistatic agent which is an organic salt, in a content of 0.5 to 5 parts by weight relative to 100 parts by weight of the total of the first resin and the second resin, having a uniform surface distribution in the composition.
14. The solventless photocurable pressure-sensitive adhesive composition according to claim 13 , wherein Z is hydrogen or an alkyl group having 1 to 20 carbon atoms.
15. The solventless photocurable pressure-sensitive adhesive composition according to claim 13 , wherein the composition further comprises a multifunctional (meth)acrylate and a photoinitiator.