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Polarizer protection film

  • US 20030063237A1
  • Filed: 07/31/2002
  • Published: 04/03/2003
  • Est. Priority Date: 07/31/2001
  • Status: Active Grant
First Claim
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1. A polarizer protection film obtained by melt film formation of a norbornene resin having (1) a glass transition temperature Tg (measured in accordance with JIS K 7121) of 135°

  • C. to 180°

    C., and (2) an inherent viscosity (η

    inh) of 0.4 or more, which is calculated by the following equation (1) from the drop time T (sec.) between marked lines measured at 30°

    C. with an Ubbelohde viscometer for a solution of the resin in chloroform having a resin concentration of C (g/dl) and the drop time B (sec.) between marked lines measured at 30°

    C. with an Ubbelohde viscometer for chloroform, the solvent, wherein (3) the above-mentioned Tg and η

    inh are within the range indicated by the following equation (2);

    η

    inh={ln(T/B)}/C



    (1) T;

    the drop time (sec.) between marked lines of a sample solution B;

    the drop time (sec.) between marked lines of a solvent alone C;

    the concentration (g/dl) of the sample solution 45η

    inh

    58.5−

    0.2Tg



    (2)

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