Title:
METHOD FOR MANUFACTURING OPTICAL FILM
Document Type and Number:
WIPO Patent Application WO/2020/012732
Kind Code:
A1
Abstract:
This method for manufacturing an optical film is for manufacturing an optical film by a solution casting film-forming method, the method including: a dope transport step in which a resin with an SP value as a solubility parameter of 10.5 (MPa)1/2 or less is dissolved in a solvent in a dissolution vessel to prepare a dope, and the dope is transported to a casting die via an intermediate vessel; and a casting step, in which the dope is cast onto a support body from the casting die. In the dope transport step, the following conditional formulas (1)–(3) are satisfied. (1) T1 > T2 > T3, (2) T1 − T3 ≤ 25°C, and (3) 5°C < T2 − T3 < 15°C, where T1 is the temperature (°C) of the dope immediately after leaving the dissolution vessel, T2 is the temperature (°C) of the dope immediately after leaving the intermediate vessel, and T3 is the temperature (°C) of the dope immediately before entering the casting die.
Inventors:
HOKITA YUKI (JP)
Application Number:
PCT/JP2019/014767
Publication Date:
January 16, 2020
Filing Date:
April 03, 2019
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
B29C41/28; B29K45/00; B29L7/00; B29L11/00
Domestic Patent References:
| WO2012035939A1 | 2012-03-22 |
Foreign References:
| JP2017121764A | 2017-07-13 |
Attorney, Agent or Firm:
SANO PATENT OFFICE (JP)
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