LIQUID-CRYSTAL POLYESTER AND MANUFACTURING PROCESS THEREFOR

• Main Authors: SAITO, SHINTARO, MATSUMI, YASUO
• Format: Patent
• Language: English; French; Japanese
• Published: 09.08.2012
• Subjects: ADHESIVES; BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DYES; FREQUENCY-CHANGING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; MECHANICAL ENGINEERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PHYSICS; POLISHES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WEAPONS

The present invention addresses the problem of providing a liquid-crystal polyester having high lightness. The present invention pertains to a liquid-crystal polyester which comprises repeating units (1) derived from an aromatic hydroxycarboxylic acid, repeating units (2) derived from an aromatic dicarboxylic acid, and repeating units (3) derived from an aromatic diol, an aromatic hydroxylamine or an aromatic diamine. In the liquid-crystal polyester, the contents of the repeating units (1), (2) and (3) are 50 to 80mol%, 10 to 25mol%, and 10 to 25mol%, respectively, relative to the sum total of all the repeating units, and the content of repeating units (A) that each have a 1,2- or 1,3-phenylene skeleton in the backbone chain is 5 to 30mol% relative to the sum total of all the repeating units. Further, the liquid-crystal polyester exhibits a flow initiation temperature of 270 to 320°C. La présente invention aborde le problème consistant à procurer un polyester à cristaux liquides ayant une clarté élevée. La présente invention concerne un polyester à cristaux liquides qui comprend des unités répétitives (1) issues d'un acide hydroxycarboxylique aromatique, des unités répétitives (2) issues d'un acide dicarboxylique aromatique et des unités répétitives (3) issues d'un diol aromatique, d'une hydroxylamine aromatique ou d'une diamine aromatique. Dans le polyester à cristaux liquides, les teneurs des unités répétitives (1), (2) et (3) sont respectivement de 50 à 80 % en moles, de 10 à 25 % en moles et de 10 à 25 % en moles, par rapport à la somme totale de toutes les unités répétitives, et la teneur d'unités répétitives (A) qui ont chacune un squelette 1,2- ou 1,3-phénylène dans la chaîne de squelette est de 5 à 30 % en moles par rapport à la somme totale de toutes les unités répétitives. En outre, le polyester à cristaux liquides présente une température de début d'écoulement de 270 à 320°C.