AROMATIC-ALIPHATIC POLYCARBONATE COPOLYMER

PURPOSE:To obtain the titled transparent copolymer, having low water absorption properties, low photoelasticity constant and well balanced refractive index and dispersion value and suitable as lenses, prisms, optical disk substrates, etc., by copolymerizing specific constituent units. CONSTITUTION:T...

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Bibliographische Detailangaben
Hauptverfasser:	KAWAKI TAKAO, IWAO SUMIO, SHINTANI NOBUHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS ORGANIC MACROMOLECULAR COMPOUNDS PHYSICS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the titled transparent copolymer, having low water absorption properties, low photoelasticity constant and well balanced refractive index and dispersion value and suitable as lenses, prisms, optical disk substrates, etc., by copolymerizing specific constituent units. CONSTITUTION:The aimed copolymer, obtained by dissolving (A) bis chloroformate of 2,2-bis(4-hydroxyphenyl)propane and (B) 70-10mol.% tricyclo (5.2.1.0 , )decanedimethanol in, e.g., an inert solvent (e.g., methylene chloride), adding an acid binder (e.g., pyridine) and reacting the components, preferably at 0-30 deg.C and having constituent units expressed by formulas I and II and 0.3-1.0g/dl reduced viscosity [etaSP/C].