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Patent Searching and Data


Title:
SELECTIVE REFLECTIVE HIGH-POLYMER MOLDING AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH11125714
Kind Code:
A
Abstract:

To obtain a molding having selective circularly polarized light reflectivity at a specific wavelength by having the selective reflection maximum of circularly polarized light in a visible light region and specifying the apparent circular dichromatic absolute value by selective reflection to a specific value or above.

The molding comprise various light crystal high polymers (liquid crystal polyester, etc.), and more particularly a cellulose deriv. insofar as a chiral nematic liquid crystal layer may be formed. The molding comprising the cellulose deriv. in such a manner has the selective maximum of the circularly polarized light in a wavelength region of 300 nm and more particularly visible light region. Further, the apparent circular dichromatic absolute value by the selective reflection is ≥2,000 m°. The process for producing this molding comprises a stage for first constituting the liquid crystal phase by bringing the molding composed of the high polymer capable of forming the liquid crystal phase into contact with solvent vapor and a stage for removing the solvent from the molding after forming the liquid crystal phase. The selective reflective moldings may be efficiently produced by such stages.


Inventors:
SHIMAMOTO SHU
DEREK GEOFFREY GRAY
Application Number:
JP28832397A
Publication Date:
May 11, 1999
Filing Date:
October 21, 1997
Export Citation:
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Assignee:
DAICEL CHEM
International Classes:
G02B5/30; B29D7/01; C08J5/18; C09K19/38; G02F1/1335; B29K1/00; (IPC1-7): G02B5/30; B29D7/01; C08J5/18; G02F1/1335
Attorney, Agent or Firm:
Mitsuo Hokita