Surface protective film, optical member comprising the same, and display apparatus comprising the same
A surface protective film, an optical member including the same, and a display apparatus including the same are provided. A surface protective film includes: a hard coating layer, a base layer, and an adhesive layer sequentially stacked in the stated order, and a laminate of the hard coating layer and the base layer may have a storage modulus of about 900 MPa to about 1500 MPa at −20° C. and a storage modulus of about 15 MPa to about 100 MPa at 85° C.
1 . A surface protective film comprising:
a hard coating layer, a base layer, and an adhesive layer sequentially stacked in the stated order,
wherein a laminate of the hard coating layer and the base layer has a storage modulus of about 900 MPa to about 1500 MPa at −20° C. and a storage modulus of about 15 MPa to about 100 MPa at 85° C.,
wherein the base layer has a storage modulus of about 900 MPa to about 1500 MPa at −20° C. and a storage modulus of about 15 MPa to about 100 MPa at 85° C.,
wherein the base layer comprises a cast polyurethane film, and
wherein the hard coating layer is formed of a urethane (meth)acrylate-based hard coating composition consisting of: a first urethane (meth)acrylate oligomer; a second urethane (meth)acrylate oligomer; a (meth)acrylate monomer; alumina particles; an initiator; a fluorine-based additive; and optionally, a solvent.
2 . The surface protective film according to claim 1 , wherein the base layer has a thickness of about 75 μm to about 200 μm.
3 . The surface protective film according to claim 1 , wherein the base layer has a fracture elongation of about 200% or more, as measured at 25° C.
4 . The surface protective film according to claim 1 , wherein the base layer has a storage modulus of about 950 MPa to about 1200 MPa at −20° C. and a storage modulus of about 50 MPa to about 90 MPa at 85° C.
5 . The surface protective film according to claim 1 , wherein the base layer has a haze of about 1% or less.
6 . The surface protective film according to claim 1 , wherein the adhesive layer has a storage modulus of about 10 kPa to about 500 kPa at −20° C. and a storage modulus of about 10 kPa to about 500 kPa at 60° C.
7 . The surface protective film according to claim 1 , wherein the hard coating layer has a water contact angle of about 100° or more at 25° C.
8 . The surface protective film according to claim 1 , wherein the surface protective film has a number of scratches of two or fewer as measured by preparing a specimen by stacking a polyethylene terephthalate film having a thickness of 75 μm on a lower surface of the adhesive layer of the surface protective film, securing the specimen to a surface property tester with a #0000 steel wool mounted thereon, and reciprocating scratching a surface of the hard coating layer 10 times with a weight of 500 g and at a scale of 50 mm to evaluate the number of scratches thereon.
9 . The surface protective film according to claim 1 , wherein the alumina particles are about 0.01 parts to about 10 parts by weight based on a total sum of 100 parts by weight of the first urethane (meth)acrylate oligomer, the second urethane (meth)acrylate oligomer, the (meth)acrylate monomer, and the alumina particles.
10 . The surface protective film according to claim 1 , wherein the adhesive layer comprises a (meth)acrylic adhesive layer 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, or a silicone-based adhesive layer formed of an adhesive composition comprising an alkenyl group-containing organopolysiloxane.
11 . The surface protective film according to claim 10 , wherein the monomer mixture comprises about 5 wt % to about 40 wt % of a hydroxyl group-containing (meth)acrylate and about 60 wt % to about 95 wt % of a comonomer.
12 . The surface protective film according to claim 10 , wherein the alkenyl group-containing organopolysiloxane comprises at least one selected from among a component (i) and a component (ii), wherein
the component (i) comprises organopolysiloxane having at least one Si-coupled C 3 to C 10 alkenyl group per molecule; and
the component (ii) comprises organopolysiloxane having at least one Si-coupled vinyl group per molecule.
13 . The surface protective film according to claim 10 , wherein the inorganic particles comprise at least one selected from among metal oxides, metal titanates, sulfides, selenides, and tellurides.
14 . The surface protective film according to claim 10 , wherein the organic particles comprise core-shell type organic nanoparticles.
15 . The surface protective film according to claim 14 , wherein the core-shell type organic nanoparticles satisfy the following Relation (1):
Tg ( c )< Tg ( s ),
where Tg(c) is a glass transition temperature (unit: ° C.) of the core, and Tg(s) is a glass transition temperature (unit: ° C.) of the shell.
16 . A display apparatus comprising the surface protective film according to claim 1 .
17 . An optical member comprising the surface protective film according to claim 1 .
18 . The optical member according to claim 17 , comprising: a window film; and the surface protective film formed on a surface of the window film.
19 . A surface protective film comprising:
a hard coating layer, a base layer, and an adhesive layer sequentially stacked in the stated order,
wherein the base layer comprises a cast polyurethane film formed by solution casting and has a Young's modulus of about 80 MPa to about 500 MPa at 25° C., and
wherein the base layer has a storage modulus of about 900 MPa to about 1500 MPa at −20° C. and a storage modulus of about 15 MPa to about 100 MPa at 85° C., and
wherein the hard coating layer is formed of a urethane (meth)acrylate-based hard coating composition consisting of: a first urethane (meth)acrylate oligomer; a second urethane (meth)acrylate oligomer; a (meth)acrylate monomer; alumina particles; an initiator; a fluorine-based additive; and optionally, a solvent.
20 . The surface protective film according to claim 19 , wherein a laminate of the hard coating layer and the base layer has a storage modulus of about 900 MPa to about 1500 MPa at −20° C. and a storage modulus of about 15 MPa to about 100 MPa at 85° C.