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Patent Searching and Data


Title:
OPTICAL FILM OR SHEET
Document Type and Number:
Japanese Patent JP3732531
Kind Code:
B2
Abstract:

PURPOSE: To obtain a film or sheet superior in heat resistance and film forming properties, an oriented film for a novel phase difference plate useful for a liquid crystal display, and a substrate for a liquid crystal display by using a polycarbonate having a structure as shown by formula I.
CONSTITUTION: A polycarbonate (co)polymer in use contains a repeating unit shown by formula I as an essential component. In the formula, R1-R4 are hydrogen atom or methyl group. Generally, methyl group has an effect of raising a solubility without lowering Tg. In addition, X is 5-10C cycloalkylene group, 7-15C aralkylene group, or 1-5C haloalkylene group. The polycarbonate (co)polymer in use contains a repeating unit shown by the formula I by more than 30mol%.


Inventors:
Yonemura Yumin
Kaoru Iwata
Hideaki Nitta
Masanori Abe
Application Number:
JP19958893A
Publication Date:
January 05, 2006
Filing Date:
August 11, 1993
Export Citation:
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Assignee:
Teijin Limited
International Classes:
B29D7/01; C08G64/00; C08G64/06; C08J5/18; G02B5/30; G02F1/1333; B29K69/00; (IPC1-7): B29D7/01; C08G64/06; G02B5/30; G02F1/1333; //B29K69:00
Domestic Patent References:
JP288634A
JP2113455A
Foreign References:
Attorney, Agent or Firm:
Hideko Mihara