Curable composition
The present application relates to a curable composition and a use thereof. The present application can provide a curable composition having excellent transparency, heat resistance and adhesion. Such a curable composition can be usefully used in direct bonding between a filler and an optical member of a display device.
1. A curable composition comprising 20 to 70 parts by weight of a polysiloxane-based urethane (meth) acrylate and 30 to 70 parts by weight of a non-reactive oligomer that has no (meth)acryl group, wherein said non-reactive oligomer is a non-reactive silicone oligomer or a non-reactive silicone modified urethane oligomer, and wherein said polysiloxane-based urethane (meth) acrylate is the reaction product of a hydroxyl group-containing polysiloxane, a polyfunctional isocyanate, and a hydroxyl group-containing (meth) acrylate.
2. The curable composition according to claim 1 , wherein
said hydroxyl group-containing polysiloxane is a compound represented by Formula 1 below:
wherein, R 1 and R 3 are each independently a hydrocarbon group or an organic group containing a hetero atom or an ether group, each of R 2 is independently an alkyl group, a cycloalkyl group or a phenyl group, a is an integer of 10 or more, b and c are each independently an integer of 0 to 3, provided that the sum of b and c is 1 or more.
3. The curable composition according to claim 1 , wherein
said polysiloxane-based urethane (meth) acrylate comprises one which is bifunctional.
4. The curable composition according to claim 3 , wherein
said polysiloxane-based urethane (meth) acrylate further comprises one which is monofunctional or one which is trifunctional.
5. The curable composition according to claim 1 , wherein
said polysiloxane-based urethane (meth) acrylate has a weight average molecular weight (Mw) of 10,000 to 100,000.
6. The curable composition according to claim 1 , wherein
said non-reactive oligomer has a weight average molecular weight (Mw) of 10,000 to 50,000.
7. The curable composition according to claim 1 , wherein
said non-reactive silicone oligomer is a compound represented by Formula 2 below:
wherein, R 4 and R 6 are each independently a hydrocarbon group or an organic group containing a hetero atom or an ether group, each of R 5 is independently an alkyl group, a cycloalkyl group or a phenyl group, and n is an integer of 10 or more.
8. The curable composition according to claim 1 , wherein
said non-reactive silicone modified urethane oligomer is the reaction product of a hydroxyl group-containing polysiloxane, a polyfunctional isocyanate, and an alkyl group or a hydroxyl group-containing monomer.
9. The curable composition according to claim 8 , wherein
said hydroxyl group-containing polysiloxane is a compound represented by Formula 1 below:
wherein, R 1 and R 3 are each independently a hydrocarbon group or an organic group containing a hetero atom, an ether group or a hydroxyl group, each of R 2 is independently an alkyl group, a cycloalkyl group or a phenyl group, a is an integer of 10 or more, b and c are each independently an integer of 0 to 3, provided that the sum of b and c is 1 or more.
10. The curable composition according to claim 1 , wherein
said curable composition after curing has an elastic modulus at 1 Hz of 10,000 Pa to 100,000 Pa, a shear strength of 20 N/cm 2 or more, and a haze of 1% or less.
11. The curable composition according to claim 1 , wherein
said curable composition has a viscosity at 1 Hz and 25° C. of 1,000 cp to 10,000 cp.
12. The curable composition according to claim 1 , wherein
said curable composition after curing and storage at 105° C. for 1000 hours has a yellow index value (Y.I) of 2.0 or less.
13. A filler for a display device comprising a cured product of a curable composition, wherein the curable composition comprising 20 to 70 parts by weight of a polysiloxane-based urethane (meth) acrylate and 30 to 70 parts by weight of a non-reactive oligomer that has no (meth)acryl group, wherein said non-reactive oligomer is a non-reactive silicone oligomer or a non-reactive silicone modified urethane oligomer.