Adhesive sheet and method for manaufacturing same

Abstract

The present invention relates to a pressure sensitive adhesive sheet 1 comprising a base material 11 and a pressure sensitive adhesive layer 12 wherein a plurality of through holes 2 passing through one face of the pressure sensitive adhesive sheet 1 to the other face are formed. The hole diameter of the through holes 2 is 0.1 to 300 μm and the hole density is 30 to 50,000/100 cm 2 . It is preferable to form the through holes 2 using a laser beam machining. According the pressure sensitive adhesive sheet 1 , an air trapping or a blister can be prevented or removed without disfiguring the pressure sensitive adhesive sheet and while securing a sufficient adhesive strength.

1 . A pressure sensitive adhesive sheet, comprising a base material and a pressure sensitive adhesive layer in which a plurality of through holes passing through one face to the other face are formed, wherein the hole diameter of the through holes at the base material and the pressure sensitive adhesive layer is 0.1 to 300 μm and the hole density is 30 to 50,000/100 cm 2 .  
   
   
       2 . The pressure sensitive adhesive sheet according to  claim 1 , wherein the hole diameter of the through holes gets gradually smaller from the back surface to the surface of the pressure sensitive adhesive sheet.  
   
   
       3 . The pressure sensitive adhesive sheet according to  claim 1  or  2 , wherein the through holes are formed by a laser beam machining.  
   
   
       4 . A method for production of pressure sensitive adhesive sheet, comprising the steps of; 
 preparing a pressure sensitive adhesive sheet comprising a base material, a pressure sensitive adhesive layer and, as desired, further a release material, and    performing a hole-forming processing on the pressure sensitive adhesive sheet to form through holes such that the hole diameter at the base material and the pressure sensitive adhesive layer is 0.1 to 300 μm and the hole density is 30 to 50,000/100 cm 2 .    
   
   
       5 . The method for production of pressure sensitive adhesive sheet according to  claim 4 , wherein the hole-forming processing is a laser beam machining.  
   
   
       6 . The method for production of pressure sensitive adhesive sheet according to  claim 5 , wherein the laser beam machining is performed from the back surface side of the pressure sensitive adhesive sheet.  
   
   
       7 . The method for production of pressure sensitive adhesive sheet according to  claim 6 , wherein a laser is directly radiated to the pressure sensitive adhesive layer.  
   
   
       8 . The method for production of pressure sensitive adhesive sheet according to  claim 6 , wherein the release material laminated on the pressure sensitive adhesive layer is peeled from the pressure sensitive adhesive layer, a laser is directly radiated to the pressure sensitive adhesive layer, and then the release material is laminated again on the pressure sensitive adhesive layer.  
   
   
       9 . The method for production of pressure sensitive adhesive sheet according to any one of  claims 4  to  8 , wherein the laser beam machining is performed while a process material or a removable protective sheet is laminated on the surface of the base material.