With Carboxylic Acid, Ester, Or Salt Thereof Patents (Class 106/169.23)
  • Retardation film, and polarizing plate and display device using the same
    Patent number: 7354633
    Abstract: A retardation film containing a polyalcohol ester, a polycarboxylic acid ester, and a cellulose ester, wherein a total acylation degree of the cellulose ester is in the range of 2.4-2.8; and a Mw/Mn value of the cellulose ester is in the range of 1.4-3.0, provided that Mw represents a weight average molecular weight and Mn represent a number average molecular weight of the cellulose ester.
    Type: Grant
    Filed: November 18, 2005
    Date of Patent: April 8, 2008
    Assignee: Konica Minolta Opto, Inc.
    Inventors: Koichi Saito, Kunio Shimizu, Isamu Michihata