BINDER USED FOR MAGNETIC RECORDING MEDIUM

PURPOSE:To raise resistance of a magnetic layer against abrasion, solvents, a combination of moisture and heat, etc., and to enhance durability of the magnetic recording medium, by adding a thermoplastic polyurethane resin having 15,000-45,000 average mol.wt., and further when needed, low mol.wt. po...

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Bibliographische Detailangaben
Hauptverfasser:	ITOU SHICHINOSUKE, MIDORIKAWA AKIO, KURODA SHIGEYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	PURPOSE:To raise resistance of a magnetic layer against abrasion, solvents, a combination of moisture and heat, etc., and to enhance durability of the magnetic recording medium, by adding a thermoplastic polyurethane resin having 15,000-45,000 average mol.wt., and further when needed, low mol.wt. polyisocyanate having at least 2 isocyanate groups. CONSTITUTION:Polyester diol, 100pts.wt. made from adipic acid, 1,6-hexandiole, and 2,2-dimethylpropandiole-1,3 having 1,000mol.wt. 60/40mol ratio of said hexandiole/propandiole and 112 OH value; 4.5pts.wt. 1,4-butandiole, and 0.01pt.wt. dibutyl-tin-laurate are mixed, and then 37pts.wt. diphenylmethanediisocyanate is added. Before mixing these components the mixture of polyols and diisocyanate are heated to 90 deg.C and 40 deg.C, respectively. When diisocyanate is added to the mixture of polyoles, they are mechanically mixed for about 1min to achieve sufficient contact among respective components, the reaction mixture is poured into a vat heated to 120 deg.C, left still for 1hr, and further, at 100 deg.C for 20hr to complete the reaction. The thermoplastic polyurethane resin is thus prepared.