Title:
BIAXIALLY ORIENTED LAMINATE POLYESTER FILM
Document Type and Number:
Japanese Patent JP2015208864
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a polyester film that can be suitably used for a backlight unit of a liquid crystal display, can be inexpensively obtained, has excellent light-diffusing property and excellent luminance characteristics, and exhibits excellent scratch-prevention property for other members when the polyester film is assembled in a backlight unit, excellent processability, suppressed interferential coloring, and good visibility.SOLUTION: A biaxially oriented polyester film having a laminated structure of three or more layers is provided, in which both outermost layers have a thickness of 2.5 μm or more, at least one layer other than the outermost layers contains a copolymer polyester that comprises ethylene glycol and a dicarboxylic acid component containing terephthalic acid and isophthalic acid. The film has an in-plane retardation of 1500 nm or less, a film haze of 3 to 25%, a total ray transmittance of 87% or more, and a roughness (Ra) of 40 to 500 nm in one film surface.
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Inventors:
AMAKO KATSUYA
KUBOTA MASARU
KUBOTA MASARU
Application Number:
JP2014089689A
Publication Date:
November 24, 2015
Filing Date:
April 24, 2014
Export Citation:
Assignee:
MITSUBISHI PLASTICS INC
International Classes:
B32B27/36