POLYURETHANE RESIN, POLYURETHANE RESIN COMPOSITION, BINDER FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM USING SAID BINDER

• Main Authors: EGUCHI HITOMI, FUKUDA MASANOBU, KURODA SHIGEYOSHI
• Format: Patent
• Language: English
• Published: 23.03.1993
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PHYSICS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

PURPOSE:To obtain the title resin excellent in solution stability and an affinity for a magnetic powder by using a polyether polyurethane resin composed of a polyol moiety and a polyether moiety with a chain extended through a urethane bond, wherein the weight-average molecular weight of the resin and the polyether moiety of the resin are specified. CONSTITUTION:A polyether polyurethane resin composed of a polyol molecule part and a polyether molecule part with a chain extended through a urethane bond, wherein the average molecular weight of the resin is 20000-200000, and the polyether molecule part comprises a polyether polyol manufactured by using a low-molecular-weight diol having an SO3M group (wherein M is an alkali metal or H) (e.g. 2-sulfosodium-1,4-butanediol) as an initiator.