Invention Grant
- Patent Title: Optical film, polarizing plate, and image display device
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Application No.: US17050720Application Date: 2019-04-26
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Publication No.: US11307339B2Publication Date: 2022-04-19
- Inventor: Toshiki Iwasaki , Yoshiaki Ooyari , Yoshimasa Ogawa , Jun Sato
- Applicant: DAI NIPPON PRINTING CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: DAI NIPPON PRINTING CO., LTD.
- Current Assignee: DAI NIPPON PRINTING CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Hamre, Schumann, Mueller & Larson, P.C.
- Priority: JPJP2018-086886 20180427
- International Application: PCT/JP2019/017974 WO 20190426
- International Announcement: WO2019/208786 WO 20191031
- Main IPC: G02B5/30
- IPC: G02B5/30 ; B32B27/08 ; G02B1/14 ; B32B27/28

Abstract:
An aspect of the present invention provides an optical film 10 including a resin base material 11 and a functional layer 12, wherein a 5-μm square region on the front surface 10A of the optical film 10 is observed to have 1 or more and 50 or less depressions having any shape at least selected from a ring shape, a circular shape, and an irregular shape, when the square region is observed using an atomic force microscope after a rubber eraser abrasion test, in which the front surface 10A is rubbed 4,000 times with a rubber eraser in a reciprocating motion under a load of 500 g; the front surface 10A has a dynamic friction coefficient of 0.70 or less before the test; and the change rate of the dynamic friction coefficient of the front surface 10A between before and after the test is 35%.
Public/Granted literature
- US20210239892A1 OPTICAL FILM, POLARIZING PLATE, AND IMAGE DISPLAY DEVICE Public/Granted day:2021-08-05
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