Interlayer filler material for touch panels, and laminate

Abstract

The present invention aims to provide an interlayer filling material for a touch panel which is used for filling an interlayer space between a touch panel and another component or an interlayer space between transparent conductive films included in the touch panel in production of a personal digital assistant, which is excellent in followability to steps of a decorative printing portion or wiring upon filling of an interlayer space (lamination) and also excellent in defoaming properties to release air bubbles entrapped during filling of an interlayer space (lamination) or air bubbles left near the steps, which is less likely to be whitened and less likely to deteriorate an ITO film even under a high-temperature and high-humidity environment. The present invention also aims to provide a laminate produced using the interlayer filling material for a touch panel. The present invention relates to an interlayer filling material for a touch panel used for filling an interlayer space between a touch panel and another component or an interlayer space between transparent conductive films included in the touch panel, the interlayer filling material including: a polyvinyl acetal; a plasticizer; and an organic acid, the plasticizer being at least one selected from the group consisting of triethylene glycol-di-2-ethylhexanoate, tetraethylene glycol-di-2-ethylhexanoate, triethylene glycol-di-pivalate, and di-(2-butoxyethyl)adipate, the organic acid being at least one selected from the group consisting of 2-ethylhexanoic acid, adipic acid, and phthalic acid.

1 . An interlayer filling material for a touch panel used for filling an interlayer space between a touch panel and another component or an interlayer space between transparent conductive films included in the touch panel,
 the interlayer filling material comprising:   a polyvinyl acetal;   a plasticizer; and   an organic acid,   the plasticizer being at least one selected from the group consisting of triethylene glycol-di-2-ethylhexanoate, tetraethylene glycol-di-2-ethylhexanoate, triethylene glycol-di-pivalate, and di-(2-butoxyethyl)adipate,   the organic acid being at least one selected from the group consisting of 2-ethylhexanoic acid, adipic acid, and phthalic acid.   
     
     
         2 . The interlayer filling material for a touch panel according to  claim 1 ,
 wherein the total amount of the polyvinyl acetal and the plasticizer is 50% by weight or more.   
     
     
         3 . The interlayer filling material for a touch panel according to  claim 1 ,
 wherein the polyvinyl acetal is polyvinyl butyral.   
     
     
         4 . The interlayer filling material for a touch panel according to  claim 1 ,
 wherein the another component is at least one of a surface protection panel and a polarizing film.   
     
     
         5 . A laminate comprising:
 a touch panel; and
 the interlayer filling material for a touch panel according to  claim 1 ,
 the interlayer filling material for a touch panel filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel. 
 
   
     
     
         6 . The interlayer filling material for a touch panel according to  claim 2 ,
 wherein the polyvinyl acetal is polyvinyl butyral.   
     
     
         7 . The interlayer filling material for a touch panel according to  claim 2 ,
 wherein the another component is at least one of a surface protection panel and a polarizing film.   
     
     
         8 . The interlayer filling material for a touch panel according to  claim 3 ,
 wherein the another component is at least one of a surface protection panel and a polarizing film.   
     
     
         9 . The interlayer filling material for a touch panel according to  claim 6 ,
 wherein the another component is at least one of a surface protection panel and a polarizing film.   
     
     
         10 . A laminate comprising:
 a touch panel; and
 the interlayer filling material for a touch panel according to  claim 2 ,
 the interlayer filling material for a touch panel filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel. 
 
   
     
     
         11 . A laminate comprising:
 a touch panel; and
 the interlayer filling material for a touch panel according to  claim 3 ,
 the interlayer filling material for a touch panel filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel. 
 
   
     
     
         12 . A laminate comprising:
 a touch panel; and
 the interlayer filling material for a touch panel according to  claim 6 ,
 the interlayer filling material for a touch panel filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel. 
 
   
     
     
         13 . A laminate comprising:
 a touch panel; and
 the interlayer filling material for a touch panel according to  claim 4 ,
 the interlayer filling material for a touch panel filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel. 
 
   
     
     
         14 . A laminate comprising:
 a touch panel; and
 the interlayer filling material for a touch panel according to  claim 7 ,
 the interlayer filling material for a touch panel filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel. 
 
   
     
     
         15 . A laminate comprising:
 a touch panel; and
 the interlayer filling material for a touch panel according to  claim 8 ,
 the interlayer filling material for a touch panel filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel. 
 
   
     
     
         16 . A laminate comprising:
 a touch panel; and
 the interlayer filling material for a touch panel according to  claim 9 ,
 the interlayer filling material for a touch panel filling at least one interlayer space selected from the group consisting of an interlayer space between a surface protection panel and the touch panel, an interlayer space between the touch panel and a polarizing film, and an interlayer space between transparent conductive films included in the touch panel.