Polyvinyl alcohol film and polarizing film and polarizing plate using the same

Abstract

The present invention provides a polyvinyl alcohol film which has a width of 3 m or more, an in-plane retardation value of 30 nm or less and a fluctuation of in-plane retardation value of 15 nm or less.

1 - 3 . (canceled) 
     
     
         4 . A process for producing a polyvinyl alcohol film, comprising:
 a step of forming a film by a casting method and   a step of thermally treating the film by plurality of hot rolls each having a surface temperature of 40° C. or higher,   wherein a contact time of any in-plane one point of the above film with each of the above hot roll is from 1 to 6 seconds in the step of the thermal treatment.   
     
     
         5 . The process for producing a polyvinyl alcohol film according to  claim 4 , wherein the sum of the contact time of any in-plane one point of the above film with each of the above hot rolls is from 30 to 100 seconds. 
     
     
         6 . The process for producing a polyvinyl alcohol film according to  claim 4 , wherein each diameter of all the above hot rolls is from 150 to 500 mm. 
     
     
         7 - 11 . (canceled)