ACRYLIC ACID DERIVATIVE COMPOUNDS AND POLYMERIC LIQUID CRYSTAL OBTAINED BY POLYMERIZING THE SAME

• Main Authors: GUNJIMA, TOMOKI, MURATA, KOUICHI, KUROSAWA, MITSURU
• Format: Patent
• Language: English; French; Japanese
• Published: 27.01.2000
• Edition: 7
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PHYSICS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP

Photopolymerizable liquid-crystal monomers which have high durability and a low melting point and are enantiotropic. The monomers are 4-(4-(alkyloxycarbonyloxy)benzoyloxy)phenyl acrylates represented by the formula (A) CH2=CHCOO-Ph-OCO-Ph-OCOO-R, wherein Ph is 1,4-phenylene and R is alkyl. A composition containing any of these monomers is photopolymerized to provide a polymeric liquid crystal. Also provided are an optical element containing the polymeric liquid crystal and an optical head containing the optical element as a polarizing holographic element. La présente invention concerne des monomères de cristal liquide photopolymérisable présentant une longue durée de vie, un faible point de fusion, et qui sont énantiotropes. Ces monomères sont des 4-(4-(alkyloxycarbonyloxy)benzoyloxy)phényl-acrylates représentés par la formule générale (A) suivante CH2=CHCOO-Ph-OCO-Ph-OCOO-R, dans laquelle Ph est 1,4-phénylène et R est alkyle. La photopolymérisation d'une composition contenant l'un quelconque de ces monomères permet d'obtenir un cristal liquide polymère. L'invention concerne également, d'une part un élément optique contenant ce cristal liquide polymère, et d'autre part une tête optique contenant l'élément optique considéré utilisé comme élément holographique polarisant.