Photocrosslinkable transparent adhesive material, transparent adhesive material layered body, and layered body for constituting optical device

Abstract

Provided is a novel transparent adhesive material having low relative permittivity as well as excellent adhesive characteristics, whereby an olefinic polymer resin layer and an acrylic polymer adhesive layer can be suitably integrated. Suggested is a transparent adhesive material provided with an outermost surface layer containing an acrylic polymer (B) and a photocrosslinking initiator, and an intermediate layer containing an olefinic polymer (A), a crosslinking agent, and a photocrosslinking initiator, in which the intermediate layer contains a (meth)acrylate monomer as the crosslinking agent.

1 . A photocrosslinkable transparent adhesive material, comprising:
 an outermost surface layer comprising a photoreaction product of an acrylic polymer (B); and   an adjacent intermediate layer comprising a photoreaction product of an olefinic polymer (A),   wherein relative permittivity of the photocrosslinkable transparent adhesive material is 3.3 or less at a frequency of from 100 kHz to 1 MHz.   
     
     
         2 . The photocrosslinkable transparent adhesive material according to  claim 1 , wherein water vapor permeability at 40° C. and 90% RH is 300 g/m 2 /day or less when calculated in terms of thickness of 150 μm. 
     
     
         3 . The photocrosslinkable transparent adhesive material according to  claim 1 , wherein haze measured based on JIS K7136 is 5% or less. 
     
     
         4 . A method for producing a layered body for an optical device, the method comprising:
 attaching the photocrosslinkable transparent adhesive material according to  claim 1  on a member which constitutes an optical device; and   irradiating the transparent adhesive material with light over the member to cure the photocrosslinkable transparent adhesive material.