Title:
METHOD FOR MANUFACTURING OPTICAL FILM CONTAINING POLYIMIDE-BASED RESIN
Document Type and Number:
WIPO Patent Application WO/2022/004861
Kind Code:
A1
Abstract:
The present invention pertains to a method for manufacturing an optical film, the method comprising: step (I) for dissolving a polyimide-based resin in a solvent to prepare a varnish; step (II) for applying the varnish onto a substrate to form a coating film; and step (III) for drying the coating film to form a film, wherein the polyimide-based resin contains a structural unit derived from an aliphatic diamine, the solvent in step (I) has a moisture absorption rate per unit area of at least 25 mass%/h·m2 as measured by the Karl Fischer method, and time T from the completion of the formation of the coating film in step (II) to the start of drying of the coating film in step (III) satisfies equation (A) [in equation (A), Vs represents the moisture absorption rate per minute (mass%/min) of the solvent as determined by the Karl Fischer method].
Inventors:
SAKURAI TAKASHI (JP)
ZOOMBELT ARJAN (US)
KERSZULIS JUSTIN (US)
ZOOMBELT ARJAN (US)
KERSZULIS JUSTIN (US)
Application Number:
PCT/JP2021/025023
Publication Date:
January 06, 2022
Filing Date:
July 01, 2021
Export Citation:
Assignee:
SUMITOMO CHEMICAL CO (JP)
ZYMERGEN INC (US)
ZYMERGEN INC (US)
International Classes:
B29C41/12; C08G73/10; C08J5/18; G02B1/04; G02B5/30
Domestic Patent References:
| WO2019069723A1 | 2019-04-11 | |||
| WO2015186594A1 | 2015-12-10 | |||
| WO2019156717A2 | 2019-08-15 |
Foreign References:
| JP2019195991A | 2019-11-14 | |||
| JP2002060512A | 2002-02-26 |
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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