POLYIMIDE COMPOSITION AND METHOD FOR PRODUCING THE SAME

• Main Authors: KAMIMURA SEIJI, YOKOKURA HISAO, SUZUKI YUKIO
• Format: Patent
• Language: English
• Published: 16.06.2005
• Edition: 7
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; 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; FILLING PASTES; FREQUENCY-CHANGING; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PHYSICS; POLISHES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

PROBLEM TO BE SOLVED: To obtain a polyimide composition that comprises a block copolymer having regularity and has excellent storage stability at a normal temperature, to provide a method for producing the same, to obtain a soluble polyimide composition for liquid-crystal orientation film, which has a pretilt angle not lowering even by aging of a liquid-crystal cell and controls development of stripe domain and development of streak-like domain by rubbing flaws and to provide a method for producing the soluble polyimide composition. SOLUTION: The block copolymer is obtained by reacting an alicyclic tetracarboxylic acid dianhydride with an aromatic diamine in the presence of a lactone-based catalyst in a heated polar solvent, further adding an aromatic tetracarboxylic acid dianhydride and an alicyclic diamine to react them, adding an aromatic tetracarboxylic acid dianhydride and a trifluoromethyl group-containing fluorine-based aromatic diamine to react them at a normal temperature and directly causing imidization reaction without passing through a polyamic acid of an intermediate. COPYRIGHT: (C)2005,JPO&NCIPI