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Polarizing fiber, polarizer, polarizing plate, laminated optical film, and image display

  • US 8,649,093 B2
  • Filed: 12/03/2012
  • Issued: 02/11/2014
  • Est. Priority Date: 06/19/2007
  • Status: Expired due to Fees
First Claim
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1. A polarizing fiber having an absorption axis in a longitudinal direction thereof;

  • whereina cross sectional form perpendicular to the longitudinal direction has a sea-island structure, the cross sectional form being made up in the longitudinal direction;

    a resin that constitutes a sea region of the sea-island structure comprises a dichroic dye;

    a resin that constitutes island regions of the sea-island structure is a transparent resin;

    the number of the island regions is 2 or more; and

    a long diameter of each of the island regions is from 0.1 to 8.0 μ

    m, and wherein when the refractive index of the resin that constitutes the island regions in a direction perpendicular to the longitudinal direction is represented by ni1 and the refractive index of the resin that constitutes the sea region in the direction perpendicular to the longitudinal direction is represented by ns1, the difference between the refractive indexes, Δ

    n1=|ns1

    ni1|, is 0.02 or less; and

    when the refractive index of the resin that constitutes the island regions in the longitudinal direction is represented by ni2 and the refractive index of the resin that constitutes the sea region in the longitudinal direction is represented by ns2, the difference between the refractive indexes, Δ

    n2=|ns2

    ni2|, is 0.03 or more and 0.05 or less.

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