Method For Producing Optical Member And Use Of Ultraviolet Ray Cured Resin Composition For Same

Abstract

The present invention relates to a method for producing an optical member, in which at least two optical substrates, of which at least either has a light shielding portion, are bonded to each other using an ultraviolet ray cured resin composition containing (A) a (meth)acrylate and (B) a photopolymerization initiator, the method having specific Process 1 to Process 3, an optical member obtained by the producing method, the use of an ultraviolet ray cured resin composition containing (A) a (meth)acrylate and (B) a photopolymerization initiator, and the ultraviolet ray cured resin composition. A bonded optical member causing little damage to an optical substrate, and exhibiting favorable productivity and excellent cure extent and adherence, for example, a touch panel or a display body unit having an optical substrate having a light shielding portion can be produced by the producing method of the present invention, and an optical member exhibiting high cure extent of resin at a light shielding portion and high reliability can be obtained by the producing method of the present invention.

1 . A method for producing an optical member including at least an optical substrate to be bonded having a light shielding portion and at least two optical substrates bonded to each other, the method comprising the following Processes 1 to 3:
 Process 1: a process of obtaining an optical substrate having a cured product layer having a cured part present on an optical substrate side in a coating layer and an uncured part present on the opposite side to the optical substrate side by coating an ultraviolet ray cured resin composition containing (A) a (meth)acrylate and (B) a photopolymerization initiator with respect to at least an optical substrate to form the coating layer, and irradiating the coating layer with ultraviolet rays;   Process 2: a process of bonding another optical substrate or an uncured part of a cured product layer of another optical substrate obtained by Process 1 with respect to the uncured part of the cured product layer of the optical substrate obtained in Process 1; and   Process 3: a process of curing the cured product layer by irradiating a cured product layer having an uncured part in a bonded optical substrate with ultraviolet rays through an optical substrate having a light shielding portion.   
     
     
         2 . The method for producing an optical member according to  claim 1 , wherein an irradiation dose of ultraviolet rays in Process 1 is from 5 to 200 mJ/cm 2 . 
     
     
         3 . The method for producing an optical member according to  claim 1 , wherein oxygen or ozone is blown upon a surface of the opposite side to the optical substrate side of the coating layer at the time of irradiating with ultraviolet rays in Process 1. 
     
     
         4 . The method for producing an optical member according to  claim 1 , wherein the optical substrate is at least a display body unit selected from the group consisting of a transparent glass substrate having a light shielding portion, a transparent resin substrate having a light shielding portion, a glass substrate having a light shielding portion and a transparent electrode formed thereon, a liquid crystal display unit, a plasma display unit, and an organic EL display unit. 
     
     
         5 . The method for producing an optical member according to  claim 1 , wherein one optical substrate is a protective substrate having a light shielding portion and the other optical substrate to be bonded to the one substrate is a touch panel or a display body unit having a touch panel, and an optical member including at least two optical substrates bonded to each other is a touch panel having a protective substrate having a light shielding portion or a display body unit having the touch panel, and either one or both of a surface provided with a light shielding portion of a protective substrate having the light shielding portion and a touch surface of a touch panel are coated with the ultraviolet ray cured resin composition in Process 1. 
     
     
         6 . The method for producing an optical member according to  claim 1 , wherein one optical substrate is an optical substrate having a light shielding portion and the other optical substrate to be bonded to the one substrate is a display body unit, and an optical member including at least two optical substrates bonded to each other is a display body unit having an optical substrate having a light shielding portion, and either one or both of a surface provided with a light shielding portion of an optical substrate having a light shielding portion and a display surface of a display body unit are coated with the ultraviolet ray cured resin composition in Process 1. 
     
     
         7 . The method for producing an optical member according to  claim 6 , wherein an optical substrate having a light shielding portion is a protective substrate to protect a display screen in a display body unit or a touch panel, and either one or both of a surface of a side having a light shielding portion of a protective substrate or a substrate surface opposite to a touch surface of a touch panel and a display surface of a display body unit are coated with the ultraviolet ray cured resin composition in Process 1. 
     
     
         8 . The method for producing an optical member according to  claim 1 , wherein (A) the (meth)acrylate is at least a (meth)acrylate selected from the group consisting of an urethane(meth)acrylate, a (meth)acrylate having a polyisoprene backbone, and a (meth)acrylate monomer. 
     
     
         9 . The method for producing an optical member according to  claim 1 , wherein the ultraviolet ray cured resin composition includes both of (i) at least either an urethane(meth)acrylate or a (meth)acrylate having a polyisoprene backbone, and (ii) a (meth)acrylate monomer, as (A) the (meth)acrylate. 
     
     
         10 . The method for producing an optical member according to  claim 1 , wherein the ultraviolet ray cured resin composition includes both of (i) an urethane(meth)acrylate obtained by a reaction of poly C2-C4 alkylene glycol, diisocyanate, and hydroxy C2-C4 alkyl(meth)acrylate, and (ii) a (meth)acrylate monomer, as (A) the (meth)acrylate. 
     
     
         11 . The method for producing an optical member according to  claim 9 , wherein a weight average molecular weight of the urethane(meth)acrylate is from 7,000 to 25,000. 
     
     
         12 . The method for producing an optical member according to  claim 1 , wherein an acylphosphine oxide compound is included as (B) the photopolymerization initiator. 
     
     
         13 . The method for producing an optical member according to  claim 12 , wherein the acylphosphine oxide compound is at least a compound selected from the group consisting of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,4,6-trimethylbenzoylphenylethoxyphosphine oxide, bis(2,4,6-trimethyl benzoyl)-phenylphosphine oxide, and bis(2,6-dimethoxybenzoyl)-2,4,4-trimethyl-pentylphosphine oxide. 
     
     
         14 . An optical member obtained by the method for producing an optical member according to  claim 1 . 
     
     
         15 . A touch panel obtained by the method for producing an optical member according to  claim 5 . 
     
     
         16 . A display body unit obtained by the method for producing an optical member according to  claim 6 . 
     
     
         17 . Use of an ultraviolet ray cured resin composition containing (A) a (meth)acrylate and (B) a photopolymerization initiator for producing an optical member by the method for producing an optical member according to  claim 1 . 
     
     
         18 . The use of an ultraviolet ray cured resin composition according to  claim 17 , wherein (B) the photopolymerization initiator is an acylphosphine oxide compound. 
     
     
         19 . An ultraviolet ray cured resin composition to be used in the method for producing an optical member according to  claim 1 , the composition comprising (A) a (meth)acrylate and (B) a photopolymerization initiator. 
     
     
         20 . The ultraviolet ray cured resin composition according to  claim 19 , wherein (B) the photopolymerization initiator is an acylphosphine oxide compound. 
     
     
         21 . The method for producing an optical member according to  claim 10 , wherein a weight average molecular weight of the urethane(meth)acrylate is from 7,000 to 25,000. 
     
     
         22 . An optical member obtained by the method for producing an optical member according to  claim 8 . 
     
     
         23 . An optical member obtained by the method for producing an optical member according to  claim 10 .