Patent ID: 7847887

Claim:
A protective film for a polarizing plate showing a water vapor transmission rate (WVTR 40 ) of 30 g/m 2 ·day or less at 60° C. and a relative humidity of 40%, a water vapor transmission rate (WVTR 95 ) of 80 g/m 2 ·day or more and 300 g/m 2 ·day or less at 60° C. and a relative humidity of 95% and a value obtained by dividing the difference between WVTR 95 and WVTR 40 by the water vapor transmission rate (WVTR 60 ) at 60° C. and a relative humidity of 60%, or (WVTR 95 -WVTR 40 )/WVTR 60 , 2.0 or more.