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Patent Searching and Data


Title:
LAYERED FILM, POLARIZING PLATE, DISPLAY DEVICE, AND METHOD FOR MANUFACTURING POLARIZING PLATE ROLL
Document Type and Number:
WIPO Patent Application WO/2021/199402
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing: a layered film which, despite being a thin film, has excellent conveyability, can be handled in the same manner as a conventional polarizing plate protective film, has excellent controllability of curling during polarizing plate processing, and has enhanced productivity (ability to be laminated with a polarizer) in polarizing plate processing; a high-quality polarizing plate that is provided with the layered film and that is devoid of optical unevenness; a display device; and a method for manufacturing a polarizing plate roll. In this layered film, a peelable functional layer is layered on a substrate film, and the layered film is characterized in that the thickness of the functional layer is in the range of 1-19 µm, the total thickness of the layered film is 50 µm or less, and the layered film satisfies the relationship represented by expression 1, where CHE1 (ppm/%RH) is the coefficient of thermal expansion of the substrate film at 23°C, d1 (µm) is the thickness of the substrate film, CHE2 (ppm/%RH) is the coefficient of thermal expansion of the functional layer at 23°C, and d2 (µm) is the thickness of the functional layer. Expression 1: 0.20 < |(CHE1 – CHE2)| × (d2/d1) < 2.00

Inventors:
OKUBO YASUSHI (JP)
FUJIEDA NANAE (JP)
NISHIMURA HIROSHI (JP)
TASAKA KOJI (JP)
TAKEBE TAKASHI (JP)
Application Number:
PCT/JP2020/015182
Publication Date:
October 07, 2021
Filing Date:
April 02, 2020
Export Citation:
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Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G02B5/30; B32B7/02; B32B7/023
Attorney, Agent or Firm:
KOYO INTERNATIONAL PATENT FIRM (JP)
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