Title:
CELLULOSE ACETATE FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP2018145435
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a cellulose acylate film to be used for a polarizing plate protective film, which is suitable for an IPS type liquid crystal display device and has small optical anisotropy, and a polarizing plate and a liquid crystal display device using the cellulose acylate film, and to provide a cellulose acylate film capable of achieving a reduced thickness of a polarizing plate protective film and higher durability of a polarizing plate, which are properties demanded in recent years, compared to conventional products, and a polarizing plate and a liquid crystal display device using the cellulose acylate film.SOLUTION: The cellulose acylate film contains each at least one of the following additives (A) and (B), and shows an in-plane retardation (Re) of -5 to 5 nm and a retardation (Rth) in a thickness direction of -10 to 5 nm at a wavelength of 590 nm in an environment at a temperature of 25°C and a relative humidity of 60%, and has a thickness of 15 to 35 μm. The additives are: (A) polyester oligomers having a repeating unit comprising a dicarboxylic acid and diol and having a number average molecular weight of 500 to 3000, in which, in the above dicarboxylic acid, a molar ratio m of an aliphatic dicarboxylic acid and a molar ratio n of an aromatic dicarboxylic acid satisfy m:n ranging from 5:5 to 0:10; and (B) a sugar ester compound having at least one of a pyranose structure and a furanose structure with the number of 1 to 12, in which all or a part of hydroxyl groups in the structures are alkyl-esterified.SELECTED DRAWING: None
Inventors:
NAGURA MASATO
KUMON YOSHIAKI
INOUE RIKIO
KUMON YOSHIAKI
INOUE RIKIO
Application Number:
JP2018083267A
Publication Date:
September 20, 2018
Filing Date:
April 24, 2018
Export Citation:
Assignee:
FUJIFILM CORP
International Classes:
C08J5/18; C08K5/1545; C08L1/12; C08L67/02; G02B5/30; G02F1/1335
Domestic Patent References:
| JP2011173964A | 2011-09-08 |
Attorney, Agent or Firm:
Patent Business Corporation Koei Patent Office