Title:
BIREFRINGENCE FILM, METHOD FOR MANUFACTURING SAME, AND METHOD FOR MANUFACTURING OPTICAL FILM
Document Type and Number:
WIPO Patent Application WO/2022/145238
Kind Code:
A1
Abstract:
A birefringence film including a crystalline polymer, a solvent A, and a solvent B, wherein the boiling point Bp(SA) (°C) of the solvent A and the boiling point Bp(SB) (°C) of the solvent B satisfy the expression Bp(SA) – Bp(SB) ≥ 5, the total content of the solvent A and the solvent B in the birefringence film is 0.01-3 wt%, and the birefringence film satisfies the expression Rth ≤ -100 nm. A manufacturing method including a step for bringing a specific film into contact with a mixed solvent including the solvent A and the solvent B to change the thickness-direction birefringence of the film.
Inventors:
SHIBATA YUJI (JP)
Application Number:
PCT/JP2021/046321
Publication Date:
July 07, 2022
Filing Date:
December 15, 2021
Export Citation:
Assignee:
ZEON CORP (JP)
International Classes:
G02B5/30; B29D7/01
Foreign References:
| JPH05346507A | 1993-12-27 | |||
| JP2011232428A | 2011-11-17 | |||
| JP2014101477A | 2014-06-05 | |||
| JP2006221140A | 2006-08-24 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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