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Process of producing a polarizer, polarizer, polarizing plate, and visual display

  • US 6,760,156 B2
  • Filed: 09/19/2002
  • Issued: 07/06/2004
  • Est. Priority Date: 09/20/2001
  • Status: Active Grant
First Claim
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1. A process of producing a polarizer, comprising the steps of:

  • subjecting a non-stretched polyvinyl alcohol film to uniaxial dry stretching treatment to give a stretch ratio of 4 times or less, dyeing the film, and then subjecting the film to uniaxial stretching treatment to give a stretch ratio of less than 1.5 times in the course of a treatment with a boron compound.

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