Polymer composition
The present invention relates to a polymer composition, an optical laminate and a display device, and can provide a polymer composition capable of forming a pressure-sensitive adhesive layer which has excellent workability, durability and dimensional stability and is capable of effectively alleviating the bending phenomenon of the display, through a polymer capable of forming a physically cross-linked structure together with a chemically cross-linked structure. In addition, the present invention can provide an optical laminate comprising a cross-linked product of the polymer composition and a display device comprising the same.
1. A polymer composition comprising a block copolymer comprising a first block having a glass transition temperature of 20° C. or higher and being in a form of a triblock copolymer, and a second block having a glass transition temperature of 10° C. or lower,
wherein the second block comprises a cross-linkable functional group,
wherein the first block comprises A blocks having a glass transition temperature of 30° C. or higher and a B block having a glass transition temperature of 0° C. or lower, wherein the A blocks are bonded to both ends of the B block, respectively, and
wherein the second block is bonded to the ends of the A blocks.
2. The polymer composition according to claim 1 , wherein each of the A blocks comprises, as a main component, a polymerized unit derived from at least one selected from the group consisting of alkyl methacrylate, acrylamide, N-alkyl acrylamide, styrene, a styrene derivative, maleimide and acrylonitrile.
3. The polymer composition according to claim 1 , wherein the B block comprises, as a main component, a polymerized unit derived from at least one selected from the group consisting of alkyl acrylate, an olefin compound, a diene compound and an alkylene oxide.
4. The polymer composition according to claim 1 , wherein the A blocks have a weight ratio in a range of 50 to 95 wt % based on the total weight of the A and B blocks.
5. The polymer composition according to claim 1 , wherein the first block has a number average molecular weight in a range of from 15,000 to 150,000.
6. The polymer composition according to claim 1 , wherein the first block has a polydispersity index (Mw/Mn) in a range of 1.01 to 3.
7. The polymer composition according to claim 1 , wherein the second block comprises, as a main component, a polymerized unit derived from alkyl acrylate.
8. The polymer composition according to claim 1 , wherein the second block further comprises a polymerized unit derived from 0.1 to 5 parts by weight of a cross-linkable monomer relative to 100 parts by weight of alkyl acrylate.
9. The polymer composition according to claim 1 , wherein the second block has a weight ratio in a range of 65 to 95 wt % based on the total weight of the first and second blocks.
10. The polymer composition according to claim 1 , wherein the block copolymer has a number average molecular weight (Mn) in a range of 100,000 to 800,000.
11. The polymer composition according to claim 1 , wherein the block copolymer has a polydispersity index (Mw/Mn) of 5 or less.
12. The polymer composition according to claim 1 , wherein the block copolymer forms a phase separated structure.
13. The polymer composition according to claim 12 , wherein the phase separated structure is a spherical structure.
14. The polymer composition according to claim 1 , further comprising a multifunctional cross-linking agent having a functional group reactive with the cross-linkable functional group.
15. The polymer composition according to claim 1 , wherein the first block does not comprise a cross-linkable functional group.
16. An optical laminate comprising an optical film; and a pressure-sensitive adhesive layer formed on one side of said optical film, wherein said pressure-sensitive adhesive layer comprises a cross-linked product of the polymer composition of claim 1 .
17. A pressure-sensitive adhesive optical film in which a pressure-sensitive adhesive layer is provided on an optical film through a primer layer, characterized in that the pressure-sensitive adhesive layer is formed by a pressure-sensitive adhesive containing the polymer composition according to claim 1 .
18. A display device comprising the optical laminate of claim 16 .