Adhesive film and method for producing adhesive film
An adhesive film or the like which is a laminate containing a substrate film containing a polycarbonate, a primer layer laminated on the surface of the substrate film, and an adhesive layer laminated on the surface of the primer layer opposite the substrate film.
1 . An adhesive film which is a laminate comprising:
a substrate film containing a polycarbonate;
a primer layer laminated at least on a surface of one side of the substrate film; and
an adhesive layer laminated on a surface of the primer layer on the other side from the substrate film,
wherein
the primer layer comprises a UV curable urethane acrylate resin,
the substrate film and the primer layer are in direct contact; and
the urethane acrylate resin contains at least a mixture of a hexafunctional urethane acrylate and a bifunctional acrylate, wherein the bifunctional acrylate is represented by the following structure:
wherein R is hydrogen or a methyl group, or
the urethane acrylate resin has an isocyanate-derived structural unit and a structural unit derived from a compound having a (meth) acryloyloxy group and a hydroxy group.
2 . The adhesive film according to claim 1 , wherein the surface of the primer layer on the adhesive layer side has a wetting index of 30 (mN/m) or more in accordance with JISK6768.
3 . The adhesive film according to claim 1 , wherein the adhesive layer contains at least one of a silicone adhesive agent, an acrylic adhesive agent and a urethane adhesive agent.
4 . The adhesive film according to claim 1 , wherein the thickness of the primer layer is 2 μm or more but less than or equal to 10 μm.
5 . The adhesive film according to claim 1 , wherein the primer layer contains any of an antistatic agent, an UV shielding agent, a near-infrared shielding agent, a light diffusion agent and metal particles.
6 . The adhesive film according to claim 1 , wherein the thickness of the adhesive layer is 10 μm or more but less than or equal to 100 μm.
7 . The adhesive film according to claim 1 , wherein the thickness of the substrate film is 30 um or more but less than or equal to 200 μm.
8 . The adhesive film according to claim 1 , wherein the thickness of the adhesive film is 40 μm or more but less than or equal to 300 μm.
9 . The adhesive film according to claim 1 , wherein the adhesive film has peel adhesion of 0.001 (N/25 mm) or more but less than or equal to 3 (N/25 mm) in a peel test where the adhesive film is laminated on a polycarbonate mirror-finished film having a thickness of 0.05 (mm) in an environment of 23° C. and relative humidity of 50%, and then peeled off in the 180° direction at 152 mm/min.
10 . The adhesive film according to claim 1 , wherein the glass transition temperature of the substrate film is higher than 140° C. but lower than 160° C.
11 . The adhesive film according to claim 1 , wherein the refractive index of the polycarbonate composing the substrate film is 1.55-1.65.
12 . A laminate comprising a molded resin body and the adhesive film according to claim 1 attached to the molded resin body.
13 . A method for fabricating the adhesive film according to claim 1 , the method comprising:
applying a primer solution onto a surface of the substrate film to form the primer layer; and
applying an adhesive agent to the surface of the primer layer on the other side from the substrate film to form the adhesive layer.
14 . The laminate according to claim 12 , wherein the molded resin body is a polycarbonate film.
15 . The laminate according to claim 12 , wherein the molded resin body is a polyimide film.