Adhesive composition for optical use and optical device
The present invention provides an adhesive composition for optical use, including a polyester-based urethane acrylate oligomer, an acrylate-based monomer, a photoinitiator, and a Anti-hydrolysis agent, and an optical device equipped with an adhesive layer including photocured products of the adhesive composition for optical use.
1. An adhesive composition for optical use, comprising:
a polyester-based urethane acrylate oligomer;
an acrylate-based monomer;
a photoinitiator; and
a Anti-hydrolysis agent,
wherein the polyester-based urethane acrylate oligomer comprises a mixture of a monofunctional polyester-based urethane acrylate oligomer having a weight average molecular weight (Mw) of 10,000 or more and 25,000 or less and a polyfunctional polyester-based urethane acrylate oligomer having a weight average molecular weight (Mw) of 30,000 or more and 40,000 or less, and
wherein a weight ratio of the monofunctional polyester-based urethane acrylate oligomer to the polyfunctional polyester-based urethane acrylate oligomer is 4:1 to 7:1.
2. The adhesive composition of claim 1 , wherein the Anti-hydrolysis agent has a melting point (Tm) of 0° C. or more and 40° C. or less.
3. The adhesive composition of claim 1 , wherein the Anti-hydrolysis agent is a liquid.
4. The adhesive composition of claim 1 , wherein the Anti-hydrolysis agent comprises a carbodiimide-based compound, an isocyanate-based compound, a polyfunctional hydroxy group-containing compound, a polyfunctional carboxyl group-containing compound, a polyfunctional amine-based compound, or a combination thereof.
5. The adhesive composition of claim 1 , wherein the acrylate-based monomer comprises: a monomer having a cycloalkyl group having 3 to 15 carbon atoms; a monomer having a heterocycloalkyl group having 2 to 15 carbon atoms; or a monomer having a hydrophilic functional group.
6. The adhesive composition of claim 1 , wherein a content of the Anti-hydrolysis agent is 0.1 parts by weight or more and 10 parts by weight or less based on 100 parts by weight of the polyester-based urethane acrylate oligomer.
7. The adhesive composition of claim 1 , wherein a content of the acrylate-based monomer is 10 parts by weight or more and 25 parts by weight or less based on 100 parts by weight of the polyester-based urethane acrylate oligomer.
8. The adhesive composition of claim 1 , further comprising:
one selected from a group consisting of a thixotropic agent, a plasticizer, an antioxidant, a light stabilizer, a curing agent, a curing accelerator, a tackifier, a surface lubricant, a leveling agent, a softener, an anti-aging agent, an ultraviolet absorber, a polymerization inhibitor, and a combination thereof.
9. An optical device equipped with an adhesive layer comprising photocured products of the adhesive composition for optical use according to claim 1 .
10. The optical device of claim 9 , wherein the adhesive layer has a Shore hardness of 9 or more and 12 or less.
11. The optical device of claim 8 , wherein the adhesive layer has a light transmittance of 90% or more and a haze of 1.0% or less.