Method of producing roll of laminate strip with polarizing film

摘要

A method of producing a roll of an optical film laminate strip including a polarizing film includes the steps of: forming a continuous web of optical film laminate including a polarizing film which consists of a polyvinyl alcohol type resin layer and has a thickness of 10 μm or less, wherein the polarizing film is formed by performing an stretching sub-step of subjecting a laminate comprising a continuous web of thermoplastic resin substrate and a polyvinyl alcohol type resin layer formed on the substrate, to a uniaxial stretching in a lengthwise direction of the laminate based on 2-stage stretching consisting of preliminary in-air stretching and in-boric-acid-solution stretching; cutting the continuous web of optical film laminate along a direction parallel to the length direction to form at least one continuous web of laminate strip having a given width; and winding the continuous web of laminate strip having the given width into a roll.

主权项

1. A roll of continuous web of an optical film laminate strip comprising:
a longitudinally continuous web of a polyvinyl alcohol (PVA) type resin layer, the PVA type resin layer having a thickness of 10 micrometers (μm) or less and having a dichroic material impregnated therein, the dichroic material oriented in said longitudinal direction of the PVA type resin layer, such that the PVA type resin layer having an absorption axis in the longitudinal direction of the web of the PVA type resin layer and having an optical property represented by formulae:
P>−(100.929T-42.4−1)×100 (wherein T<42.3); andP≧99.9 (wherein T≧42.3);orT≧42.5; andP≧99.5,where T represents a single layer transmittance and P represents a polarization degree; and
a longitudinally continuous film of a resin laminated onto the PVA type resin layer, wherein the continuous web of the optical film laminate strip has a predetermined width, and the continuous web of the optical film laminate strip is wound into the roll.