Title:
PHASE DIFFERENCE FILM, CIRCULARLY POLARIZING PLATE, AND METHOD FOR MANUFACTURING PHASE DIFFERENCE FILM
Document Type and Number:
WIPO Patent Application WO/2019/003503
Kind Code:
A1
Abstract:
The present invention provides a phase difference film capable of minimizing a change in a phase difference value under high temperature and high humidity environment. A manufacturing method according to the present invention is used to produce a phase difference film with an in-plane retardation that satisfies the relationship of Re(450) < Re(550). The manufacturing method includes a heat treatment step of heating a stretched film for two minutes or longer at a temperature of 105°C or higher, the stretched film exhibiting a shrinkage of 0.4% or less along the slow axis in the TMA of heating which repeats the cycle of heating and cooling the stretched film between 30°C and Tg - 25°C three times or the stretched film exhibiting a shrinkage of 0.7% or less along the slow axis in the TMA of humidification which changes the environment in order of 25°C/25%RH, 85°C/2%RH, 85°C/85%RH, and 85°C/2%RH.
Inventors:
SUZUKI MITSURU (JP)
SUMIMURA HIROSHI (JP)
TAKAMATSU HIDEYUKI (JP)
SHIMIZU TAKASHI (JP)
YAGINUMA HIRONORI (JP)
TOMOHISA HIROSHI (JP)
SUMIMURA HIROSHI (JP)
TAKAMATSU HIDEYUKI (JP)
SHIMIZU TAKASHI (JP)
YAGINUMA HIRONORI (JP)
TOMOHISA HIROSHI (JP)
Application Number:
PCT/JP2018/009158
Publication Date:
January 03, 2019
Filing Date:
March 09, 2018
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
G02B5/30; B29C55/06; H01L51/50; H05B33/02; B29L7/00; B29L11/00
Domestic Patent References:
| WO2016060144A1 | 2016-04-21 | |||
| WO2015072486A1 | 2015-05-21 |
Foreign References:
| JP2015127830A | 2015-07-09 | |||
| JP2012181536A | 2012-09-20 | |||
| JP2008247934A | 2008-10-16 | |||
| JP2008102498A | 2008-05-01 |
Attorney, Agent or Firm:
MOMII Takafumi (JP)
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