Pressure sensitive adhesive for sticking an electromagnetic wave-shielding film and an optically functional film, and a display panel filter element containing same

A method for manufacturing a display panel filter element, comprising:

• sticking together an electromagnetic wave-shielding film and an optically functional film with a pressure sensitive adhesive under a pressure of 0.3 to 1.5 MPa at 40 to 80° C., to produce said display panel filter element having
• (1) said electromagnetic wave-shielding film, said film being a laminate of a transparent substrate film, an adhesive for a metal foil, and a metal foil mesh formed on said adhesive for a metal foil, said adhesive being applied on one surface of said transparent substrate film, an aperture ratio of said metal foil mesh being 65 to 95% and the thickness of said metal foil mesh being 1 μm to 20 μm,
• (2) a layer of said pressure sensitive adhesive, said pressure sensitive adhesive being applied so as to cover said metal foil mesh of said electromagnetic wave-shielding film, and
• (3) said optically functional film provided on said pressure sensitive adhesive;
• wherein
• said pressure sensitive adhesive has a storage elastic modulus at 70° C. of 7.00×104 Pa to 1.00×106 Pa and a storage elastic modulus at 23° C. of 1.00×105 Pa or more,
• said pressure sensitive adhesive comprises an acrylic copolymer prepared from comonomers comprising (meth)acrylic alkyl ester and nitrogen-containing vinyl,
• said comonomers further comprise hydroxyalkyl (meth)acrylate as a monomer containing a cross-linking functional group,
• said optically functional film is selected from the group consisting of a film absorbing a near infrared or infrared light, a film absorbing a neon light, a film absorbing an ultraviolet light, a film preventing or alleviating a leakage of an electromagnetic wave in addition to the metal foil mesh, a film inhibiting a reflection of an outside light, and a film adjusting a color tone.

A display panel filter element comprising

• (1) an electromagnetic wave-shielding film, said film being a laminate of a transparent substrate film, an adhesive for a metal foil, and a metal foil mesh formed on said adhesive for a metal foil, said adhesive being applied on one surface of said transparent substrate film, an aperture ratio of said metal foil mesh being 65 to 95% and the thickness of said metal foil mesh is 1 μm 20 μm,
• (2) a layer of a pressure sensitive adhesive, for sticking together an electromagnetic wave-shielding film and an optically functional film under a pressure of 0.3 to 1.5 MPa at 40 to 80° C., wherein said pressure sensitive adhesive has a storage elastic modulus at 70° C. of 7.00×104 Pa to 1.00×106 Pa and a storage elastic modulus at 23° C. of 1.00×105 Pa or more, said pressure sensitive adhesive comprising an acrylic copolymer prepared from comonomers comprising (meth)acrylic alkyl ester and nitrogen-containing vinyl, said comonomers further comprising hydroxyalkyl (meth)acrylate as a monomer containing a cross-linking functional group, and
• (3) an optically functional film provided on said pressure sensitive adhesive, said optically functional film being selected from the group consisting of a film absorbing a near infrared or infrared light, a film absorbing a neon light, a film absorbing an ultraviolet light, a film preventing or alleviating a leakage of an electromagnetic wave in addition to the metal foil mesh, a film inhibiting a reflection of an outside light, and a film adjusting a color tone.