Multilayer adhesive sheet, optical member comprising the same and display apparatus comprising the same
A multilayer adhesive sheet, an optical member including the same, and a display apparatus including the same are provided. A multilayer adhesive sheet includes: a base layer; a first adhesive layer stacked on a surface of the base layer; and a second adhesive layer stacked on another surface of the base layer, and the base layer includes a polyurethane-based film manufactured by solution casting and has a storage modulus of 700 MPa to 1,500 MPa at −20° C. and a storage modulus of 10 MPa to 100 MPa at 85° C.
1 . A multilayer adhesive sheet comprising: a base layer; a first adhesive layer stacked on a surface of the base layer; and a second adhesive layer stacked on another surface of the base layer,
wherein the base layer comprises a polyurethane-based film manufactured by solution casting and has a storage modulus of 700 MPa to 1,500 MPa at −20° C. and a storage modulus of 10 MPa to 100 MPa at 85° C.,
wherein the base layer has a thickness of 10 μm to 20 μm,
wherein a laminate of the first adhesive layer, the base layer, and the second adhesive layer has a tensile modulus of 0.12 GPa to 0.2 GPa at 25° C.,
wherein the first adhesive layer is formed of an adhesive composition comprising a monomer mixture for a hydroxyl group-containing (meth)acrylic copolymer; particles or a particle mixture comprising at least one selected from among organic particles and inorganic particles; and an initiator, and
the second adhesive layer is formed of an adhesive composition comprising a monomer mixture for a hydroxyl group-containing (meth)acrylic copolymer; particles or a particle mixture comprising at least one selected from among organic particles and inorganic particles; and an initiator, and
the first adhesive layer has a storage modulus of 10 kPa to 500 kPa at −20° C. and a storage modulus of 10 kPa to 100 kPa at 60° C., and the second adhesive layer has a storage modulus of 10 kPa to 500 kPa at −20° C. and a storage modulus of 10 kPa to 100 kPa at 60° C.
2 . The multilayer adhesive sheet according to claim 1 , wherein the base layer has a Young's modulus of 50 MPa to 500 MPa at 25° C.
3 . The multilayer adhesive sheet according to claim 1 , wherein each of the first adhesive layer and the second adhesive layer has a thickness of 10 μm to 50 μm.
4 . The multilayer adhesive sheet according to claim 1 , wherein a tensile modulus of the base layer at 25° C. is 75% to 200% of the tensile modulus of the laminate of the first adhesive layer, the base layer, and the second adhesive layer at 25° C.
5 . The multilayer adhesive sheet according to claim 1 , wherein the multilayer adhesive sheet has a pen-drop impact resistance of 5.5 cm or greater.
6 . The multilayer adhesive sheet according to claim 1 , wherein the thickness of the base layer is 10% to 90% of an entire thickness of the first adhesive layer and the second adhesive layer.
7 . The multilayer adhesive sheet according to claim 6 , wherein the thickness of the base layer is 10% to 50% of the entire thickness of the first adhesive layer and the second adhesive layer.
8 . An optical member comprising:
an optical element; and
the multilayer adhesive sheet according to claim 1 stacked on a surface of the optical element.
9 . The optical member according to claim 8 , wherein the optical element comprises a plastic plate or a glass plate.
10 . A display apparatus comprising the multilayer adhesive sheet according to claim 1 .
11 . A multilayer adhesive sheet comprising: a base layer; a first adhesive layer stacked on a surface of the base layer; and a second adhesive layer stacked on another surface of the base layer,
wherein the base layer comprises a polyurethane-based film manufactured by solution casting and has a storage modulus of 700 MPa to 1,500 MPa at −20° C. and a storage modulus of 10 MPa to 100 MPa at 85° C.,
wherein the base layer has a thickness of 10 μm to 20 μm,
wherein the base layer has a Young's modulus of 100 MPa to 500 MPa at 25° C.,
wherein a laminate of the first adhesive layer, the base layer, and the second adhesive layer has a tensile modulus of 0.12 GPa to 0.2 GPa at 25° C.,
wherein the first adhesive layer is formed of an adhesive composition comprising a monomer mixture for a hydroxyl group-containing (meth)acrylic copolymer; particles or a particle mixture comprising at least one selected from among organic particles and inorganic particles; and an initiator, and
the second adhesive layer is formed of an adhesive composition comprising a monomer mixture for a hydroxyl group-containing (meth)acrylic copolymer; particles or a particle mixture comprising at least one selected from among organic particles and inorganic particles; and an initiator, and
the first adhesive layer has a storage modulus of 10 kPa to 500 kPa at −20° C. and a storage modulus of 10 kPa to 100 kPa at 60° C., and the second adhesive layer has a storage modulus of 10 kPa to 500 kPa at −20° C. and a storage modulus of 10 kPa to 100 kPa at 60° C.