MAGNETIC RECORDING MEDIUM

PURPOSE: To enhance wear resistance and residual magnetic induction at and under a high temp. and high humidity and to obtain a defectless layer surface and a narrow magnetic field intensity distribution by using OH group-contg. polyurea urethane and polyurethane urea (meth)acrylate as a binder comp...

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Hauptverfasser:	BUERUNAA RENTSU, NORUBERUTO SHIYUNAIDAA, ATEIRA BUASU, AUGUSUTO REENAA, BUERUNAA ROTSUHO, GUREEGORU BUROTO
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 GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS 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 TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PURPOSE: To enhance wear resistance and residual magnetic induction at and under a high temp. and high humidity and to obtain a defectless layer surface and a narrow magnetic field intensity distribution by using OH group-contg. polyurea urethane and polyurethane urea (meth)acrylate as a binder compsn. in a magnetic layer. CONSTITUTION: The polyurethane urea (meth)acrylate consists of poly (meth) acrylate having terminal OH groups up to two pieces per mol and a mol.wt. of 200 to 50000, 0.1 to 10wt.% diisocyanate, 30 to 80wt.% triisicyanate, 20 to 60wt.% isocyanate exhibiting functional 4 to 10. The polyurea (meth)acrylate is brought into reaction with an aliphat. polyisocyanate mixture having average functionality of NCO groups of 3 to 6 pieces per mol. The NCO groups of 2 to 3 pieces per piece of the OH group react and the residual NCO groups are converted to a substd. terminal urea group having multifunctional amine or plural kinds of the multifunctional amine mixture varying from each other.