PRESSURE SENSITIVE ADHESIVE FOR STICKING AN ELECTROMAGNETIC WAVE-SHIELDING FILM AND AN OPTICALLY FUNCTIONAL FILM, AND A DISPLAY PANEL FILTER ELEMENT CONTAINING SAME

Abstract

A pressure sensitive adhesive for sticking together an electromagnetic wave-shielding film and an optically functional film, wherein a storage elastic modulus at 70° C. is 7.00×104 Pa or more; and a display panel filter element comprising (1) an electromagnetic wave-shielding film, the film being a laminate of a transparent substrate film, an adhesive for a metal foil, which is applied on one surface of the transparent substrate film, and a metal foil mesh formed on the adhesive for a metal foil,(2) a layer of the pressure sensitive adhesive according to (1), which is applied so as to cover the metal foil mesh of the electromagnetic wave-shielding film, and(3) an optically functional film provided on the pressure sensitive adhesive, are provided. The pressure sensitive adhesive exhibits a sufficient adhesive strength, can be filled into the inside of the pores of the metal foil mesh, and does not generate bubbles in a heating treatment.

Description

Claims

1. A pressure sensitive adhesive for sticking together an electromagnetic wave-shielding film and an optically functional film, wherein a storage elastic modulus at 70° C. is 7.00×104 Pa or more.

2. The pressure sensitive adhesive according to claim 1, wherein a storage elastic modulus at 23° C. is 1.00×105 Pa or more.

3. The pressure sensitive adhesive according to claim 1, wherein a peak temperature of loss tangent (tan δ) is −15° C. or more.

4. The pressure sensitive adhesive according to claim 1, comprising an acrylic copolymer containing (meth)acrylic alkyl ester monomers as a comonomer.

5. The pressure sensitive adhesive according to claim 4, comprising the acrylic copolymer further containing nitrogen-containing vinyl monomers as a comonomer.

6. The pressure sensitive adhesive according to claim 4, wherein said acrylic copolymer does not contain an acid comonomer.

7. The pressure sensitive adhesive according to claim 5, wherein said acrylic copolymer does not contain an acid comonomer.

8. A display panel filter element comprising

9. The display panel filter element according to claim 8, wherein a storage elastic modulus at 23° C. of said pressure sensitive adhesive is 1.00×105 Pa or more.

10. The display panel filter element according to claim 8, wherein a peak temperature of loss tangent (tan δ) of said pressure sensitive adhesive is −15° C. or more.

11. The display panel filter element according to claim 8, wherein said pressure sensitive adhesive comprises an acrylic copolymer containing (meth)acrylic alkyl ester monomers as a comonomer.

12. The display panel filter element according to claim 11, wherein said pressure sensitive adhesive comprises the acrylic copolymer further containing nitrogen-containing vinyl monomers as a comonomer.

13. The display panel filter element according to claim 11, wherein said acrylic copolymer does not contain an acid comonomer.

14. The display panel filter element according to claim 12, wherein said acrylic copolymer does not contain an acid comonomer.