Glass fabric base material/thermosetting resin copper-clad laminate having a high-elasticity

Abstract

A copper-clad laminate of a highly-elastic glass fabric base material/thermosetting resin formed of prepreg obtained by impregnating a glass fabric base material made of a glass woven fabric having a thickness of 25 to 150 μm, a weight of 15 to 165 g/m 2 and a gas permeability of 1 to 20 cm 3 /cm 2 /sec. with a thermosetting resin composition and drying it.

1 - 5 . (canceled)  
   
   
       6 . A process for processing a hole in a copper-clad laminate, being used in a printed wiring board, comprising a glass fabric/thermosetting resin base material, which comprises 
 adding and mixing an insulating inorganic filler with a thermosetting resin composition in an amount of 10 to 80% by weight based on said resin composition,    impregnating a glass fabric base material made of a glass woven fabric having a thickness of 25 to 40 μm, a weight of 15 to 27 g/m 2  and a gas permeability of 1 to 20 cm 3 /cm 2 /sec, with the thermosetting resin composition being dissolved in a solvent,    drying it to obtain prepreg,    placing a copper foil on the prepreg,    laminate-forming the copper foil and the prepreg to obtain the copper-clad laminate, and    irradiating the copper-clad laminate with a carbon dioxide gas laser to form a hole having a diameter of 0.15 mm or less.    
   
   
       7 . A process for processing a hole according to  claim 6 , wherein the output energy of a carbon dioxide gas laser is 20 to 60 mJ/pulse.  
   
   
       8 . A process for processing a hole according to  claim 6 , wherein the prepreg has a glass content of 25 to 70% by weight.  
   
   
       9 . A process for processing a hole according to  claim 6 , wherein a glass fabric material/thermosetting resin base material layer of the copper-clad laminate has a thickness of 30 to 150 μm.  
   
   
       10 . A process for processing a hole according to  claim 6 , wherein the thermosetting resin composition is a resin composition containing, as an essential component, a polyfunctional cyanate ester and a prepolymer of said polyfunctional cyanate ester.