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Method for stretching polymer film, polarizing film and method for producing the same, polarizer, birefringencial film and liquid crystal display device

  • US 20040022965A1
  • Filed: 07/31/2003
  • Published: 02/05/2004
  • Est. Priority Date: 07/10/2000
  • Status: Active Grant
First Claim
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1. A method for stretching an optical polymer film by holding both edges of the continuously supplied polymer film by holding means, and imparting tension thereto while advancing said holding means in a longitudinal direction of the film, which comprises allowing a locus L1 of the holding means from a substantial holding initiation point to a substantial holding release point on one edge of the polymer film, a locus L2 of the holding means from a substantial holding initiation point to a substantial holding release point on the other edge of the polymer film, and a distance W between the two:

  • substantial holding release points to satisfy the following equation (1), maintaining the supporting property of the polymer film, stretching the film in the presence of a state in which the volatile content is 5% or more, and then, decreasing the volatile content while shrinking the film;

    |L2−

    L1|>

    0.4W



    (1)

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