Glass cloth and film substrate using it

Abstract

Glass cloth which is formed of a warp yarn and a weft yarn of the same glass yarn, wherein a ratio of warp yarn width to weft yarn width is not less than 0.80 and not more than 1.20 and a ratio of an elongation rate in a length direction when a load in a range of 25 N to 100 N per 25 mm width of the glass cloth is added in a warp yarn direction, to an elongation rate in a width direction when said load is added in a weft yarn direction is not less than 0.80 and not more than 1.20.

1 . Glass cloth which is composed of a warp yarn and a weft yarn of the same glass yarn, wherein a ratio of warp yarn width to weft yarn width is not less than 0.80 and not more than 1.20 and a ratio of an elongation rate in a length direction when a load in a range of 25 N to 100 N per 25 mm width of the glass cloth is added in a warp yarn direction, to an elongation rate in a width direction when said load is added in a weft yarn direction is not less than 0.80 and not more than 1.20.  
   
   
       2 . Glass cloth according to  claim 1 , which is obtained by a flattening processing under a tension exerted on the glass cloth of not more than 49 N/m per 1 m width of the glass cloth.  
   
   
       3 . Glass cloth according to  claim 1  or  2 , wherein a thickness of the glass cloth is not less than 10 μm and not more than 50 μm.  
   
   
       4 . Glass cloth according to  claim 1  or  2 , wherein an average diameter of filaments of the glass yarn forming the glass cloth is not less than 3.0 μm and less than 6.0 μm and the number of the filaments of the glass yarn is not less than 50 and not more than 204.  
   
   
       5 . A film substrate composed of one sheet of glass cloth according to  claim 1  or  2  and a matrix resin.