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Adhesive composition, protective film for a polarizing plate, polarizing plate, and liquid crystal display

  • US 10,640,688 B2
  • Filed: 04/12/2017
  • Issued: 05/05/2020
  • Est. Priority Date: 07/01/2008
  • Status: Active Grant
First Claim
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1. A polarizer comprising:

  • a polarizing film or polarizing element; and

    a protective film attached to a side or both sides of the polarizing film or polarizing element,wherein the protective film comprises;

    a base film on the polarizing film or polarizing element, anda pressure sensitive adhesive layer in direct contact with a side of the base film opposite to the polarizing film or polarizing element,wherein the base film is a cycloolefine polymer film or an acrylic film,wherein a stress optical coefficient of the base film is 6 brewster or less and wherein the pressure sensitive adhesive layer is a cured product of a pressure-sensitive adhesive composition satisfying a condition of General Formula 1 given below and wherein the pressure-sensitive adhesive composition comprises a base resin comprising an aromatic ring-containing monomer or the pressure-sensitive adhesive composition comprises a compound having a positive stress optical coefficient;


    Δ

    X≤

    2 nm, 



    [General Formula 1]wherein Δ

    X represents an absolute value of a phase retardation (Rin) in a surface-direction, the phase retardation being measured by an equation, Rin={(nx

    ny

    d}, when a sheet-shaped pressure-sensitive adhesive that has a width of 10 mm and a length of 20 mm and that is prepared by using the pressure-sensitive adhesive composition is elongated by 500 μ

    m in a longitudinal direction at 23°

    C., wherein nx represents a refractive index along a horizontal axis in a surface of the sheet-shaped pressure-sensitive adhesive, ny represents a refractive index along a vertical axis in the surface of the sheet-shaped pressure-sensitive adhesive, and d represents a thickness of the sheet-shaped pressure-sensitive adhesive.

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