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Methods for manufacturing polarizing element, polarizing element roll and single sheet type polarizing element having local bleaching areas

  • US 10,436,960 B2
  • Filed: 03/25/2015
  • Issued: 10/08/2019
  • Est. Priority Date: 03/26/2014
  • Status: Active Grant
First Claim
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1. A method for manufacturing a polarizing element including locally bleached areas comprising:

  • providing a polarizing element including a polyvinyl alcohol-based polarizer in which at least one of iodine and dichroic dye is oriented in a certain direction;

    attaching a protective film to one surface of the polyvinyl alcohol-based polarizer;

    partially bleaching the polarizing element by bringing a bleaching solution into contact with the surface opposite to the surface of the polyvinyl alcohol-based polarizer to which the protective film is attached through a printing method;

    correcting an appearance of the partially bleached polarizing element; and

    washing and drying the polarizing element after the appearance correcting step,wherein the partially bleaching step is carried out using a method of an inkjet marking method or a gravure printing method,wherein the step of correcting an appearance of the partially bleached polarizing element is carried out using a method of immersing the polarizing element into a neutralizing solutionwherein the neutralizing solution includes one or more neutralizing agents selected from the group consisting of sulfuric acid, citric acid and hydrochloric acid, andwherein the locally bleached areas have single transmittance of 90% or greater in a wavelength band of 400 nm to 800 nm.

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