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Patent Searching and Data


Title:
BROADBAND WAVELENGTH FILM, PRODUCTION METHOD FOR SAME, AND PRODUCTION METHOD FOR CIRCULARLY POLARIZING FILM
Document Type and Number:
WIPO Patent Application WO/2019/208508
Kind Code:
A1
Abstract:
A production method for a broadband wavelength film, the production method including, in order, a first step for preparing a layer (A) that is a resin film that has a slow axis, a second step for obtaining a multilayer film by forming, on layer (A), a layer (B) of a resin that has a positive intrinsic birefringence, and a third step for obtaining a long broadband wavelength film that has a λ/2 layer and a λ/4 layer by stretching the multilayer film in a direction that is neither orthogonal nor parallel to the slow axis of layer (A). The λ/2 layer and the λ/4 layer of the broadband wavelength film satisfy formula (1). (1) θ(λ/4)={45°+2×θ(λ/2)}±5°. (θ(λ/2) is the angle formed by the slow axis of the λ/2 layer relative to the longitudinal direction of the broadband wavelength film, and θ(λ/4) is the angle formed by the slow axis of the λ/4 layer relative to the longitudinal direction of the broadband wavelength film.)

Inventors:
ISHIHARA, Jiro (6-2 Marunouchi 1-chome, Chiyoda-k, Tokyo 46, 〒1008246, JP)
OSATO, Kazuhiro (6-2 Marunouchi 1-chome, Chiyoda-k, Tokyo 46, 〒1008246, JP)
Application Number:
JP2019/017053
Publication Date:
October 31, 2019
Filing Date:
April 22, 2019
Export Citation:
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Assignee:
ZEON CORPORATION (6-2 Marunouchi 1-chome, Chiyoda-ku Tokyo, 46, 〒1008246, JP)
International Classes:
G02B5/30; B29C55/10; B32B7/023; B29L7/00; B29L9/00; B29L11/00
Domestic Patent References:
WO2016047465A12016-03-31
WO2018079745A12018-05-03
WO2018079746A12018-05-03
WO2012073462A12012-06-07
WO2016140077A12016-09-09
Foreign References:
JP2002040258A2002-02-06
JP2009282546A2009-12-03
JP2010181710A2010-08-19
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (Toranomon Mitsui Building, 8-1 Kasumigaseki 3-chome, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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