Patent ID: 9581743
Date: 2017-02-28
CPC Classifications: B29C,B29K,C09K,G02B,G02F,Y10T

Claim:
1. An optical film roll, which has a width corresponding to a pair of opposite sides of a liquid crystal cell and is capable of being cut to a length corresponding to another pair of opposite sides of the liquid crystal cell to be continuously attached to a surface of the liquid crystal cell, the optical film roll comprising a long optical film wound into a roll shape, the long optical film obtained by subjecting a long optical raw film, which includes a polarizing film having an absorption axis in its width direction, to a slitting process in a machine direction while conveying the long optical raw film in its lengthwise direction, the polarizing film comprising a polyvinyl alcohol-based resin film that contains a dichromatic substance, wherein the polyvinyl-alcohol-based resin film that contains a dichromatic substance has a polarization degree of 99.93% or more at a single axis transmittance of 40%, and an Nz coefficient of 1.10 or more and 1.50 or less, and wherein the polarizing film is obtained by shrinking and stretching the polyvinyl alcohol-based resin film formed on a thermoplastic resin substrate in an MD (machine direction) and a TD (direction perpendicular to the machine direction), respectively.