Coated magnetic metal or alloy pigment useful in recording material - has ortho-silicate ester coating to prevent corrosion in humid aid

Magnetic metal and alloy pigments are coated with 0.2-30 (1-20 esp. 2-15) wt.% orthosilicate ester(s) (I) and/or its hydrolysates and/or condensates. (I) pref. has the formula (RO)nSi(OR')(4-n) (in which R is a 1-20C (cyclo)alkyl or alkenyl gp., which can be branched and/or have one or more 0 b...

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Bibliographische Detailangaben
Hauptverfasser:	LEITNER,LUTZ,.DR, NAUMANN,ROLF,.DR, HEINE,HEINRICH,.DR, STEINBERGER,HELMUT,.DR, BOTTA,ARTUR,.DR, BIERMANN,HANS-PETER,.DR
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ADHESIVES BASIC ELECTRIC ELEMENTS CASTING CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES ELECTRICITY FILLING PASTES INDUCTANCES INKS MAGNETS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES POWDER METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	Magnetic metal and alloy pigments are coated with 0.2-30 (1-20 esp. 2-15) wt.% orthosilicate ester(s) (I) and/or its hydrolysates and/or condensates. (I) pref. has the formula (RO)nSi(OR')(4-n) (in which R is a 1-20C (cyclo)alkyl or alkenyl gp., which can be branched and/or have one or more 0 bridges in the chain, or an ar(alk)yl gp. R' is an opt. branched 1-4C alkyl gp. n= 0-4, pref. 1-3). Pref. the coating also contains corrosion inhibitor(s) (II), pref. 0.01-5 (0.1-4, esp. 0.5-3) wt.% cpd(s). of the benzotriazole, benzothiazole, benzimidazole, guanidine, amidine and/or metal carboxylate type. The pigments are specified for use in the prodn. of magnetic recording media. The coating provides protection against attack by atmos. O2 and humidity. The coated particles have very good dispersibility and there are no compatibility problems with conventional binders.