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Title:
OPTICAL FILM, POLARIZING PLATE, AND IMAGE DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/208786
Kind Code:
A1
Abstract:
The present invention provides an optical film, and a polarizing plate and an image display device that are provided therewith, the optical film capable of achieving excellent scuff resistance and excellent abrasion resistance, and achieving excellent antifouling performance. According to one aspect of the present invention, provided is an optical film 10 equipped with: a resin substrate 11; and a functional layer 12 provided on a first surface 11A side of the resin substrate 11, wherein a front surface 10A of the optical film 10 is a front surface 12A of the functional layer 12, when a 5 μm square region of the front surface 10A of the optical film 10 subjected to an eraser test (500 g × 4000 round trips) in which the front surface 10A of the optical film 10 is rubbed in 4000 round trips under a load of 500 g using an eraser is observed using an atomic force microscope, 1-50 (inclusive) dents having at least any of a ring shape with an outside diameter of 0.1-2.5 μm (inclusive) and a depth of 1-5 nm (inclusive), a circular shape with a diameter of 0.1-2.5μm (inclusive) and a depth of 1-150 nm (inclusive), and an indefinite shape with a diameter of 0.1-2.5μm (inclusive) and a depth of 1-150 nm (inclusive) are present within the region, the coefficient of dynamic friction of the front surface 10A of the optical film 10 before the eraser test is 0.70 or less, and the rate of change of the coefficient of dynamic friction of the front surface 10 of the optical film 10 after the eraser test (500 g × 4000 round trips) with respect to the coefficient of dynamic friction of the front surface 10A of the optical film 10 before the eraser test is 35%.

Inventors:
IWASAKI Toshiki (1-1-1, Ichigaya-Kagacho Shinjuku-k, Tokyo 01, 〒1628001, JP)
OOYARI Yoshiaki (1-1-1, Ichigaya-Kagacho Shinjuku-k, Tokyo 01, 〒1628001, JP)
OGAWA Yoshimasa (1-1-1, Ichigaya-Kagacho Shinjuku-k, Tokyo 01, 〒1628001, JP)
SATO Jun (1-1-1, Ichigaya-Kagacho Shinjuku-k, Tokyo 01, 〒1628001, JP)
Application Number:
JP2019/017974
Publication Date:
October 31, 2019
Filing Date:
April 26, 2019
Export Citation:
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Assignee:
DAI NIPPON PRINTING CO., LTD. (1-1-1, Ichigaya-Kagacho Shinjuku-ku Tokyo, 01, 〒1628001, JP)
International Classes:
G02B1/14; B32B7/023; G02B5/30; H01L27/32; H01L51/50; H05B33/02
Domestic Patent References:
WO2017073756A12017-05-04
WO2014050798A12014-04-03
Foreign References:
JP2009175500A2009-08-06
JP2018173564A2018-11-08
JP2017219597A2017-12-14
Attorney, Agent or Firm:
YOKOTA Nobutaka et al. (FIELDS IP Attorneys, 613 AIOS Nagatacho, 17-17, Nagatacho 2-chome, Chiyoda-k, Tokyo 14, 〒1000014, JP)
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