Magnetic recording binder containing aminoalkylphosphonate salt

C - Chemistry – Metallurgy – 07 – F

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C07F 9/40 (2006.01) C08G 18/08 (2006.01) C08G 18/38 (2006.01) C08G 18/83 (2006.01) C08G 63/692 (2006.01) C08G 63/91 (2006.01) G11B 5/702 (2006.01)

Patent

CA 2143353

A magnetic recording medium is prepared by applying a magnetic coating composition onto a non-magnetic support and curing said composition, said coating composition containing ferromagnetic particles dispersed in a binder comprising a thermoplastic resin selected from the group consisting of polyurethanes and polyester wherein there is chemically bonded to said resin at least one aminoalkylphosphonate represented by the formula: (see fig. I) wherein R1 and R2 are the same or different oxyalkylene radicals having from 2 to 12 carbon atoms, R3 is an alkylene radical having from 1 to 12 carbon atoms, or an aralkylene radical having from 7 to 10 carbon atoms, R4 is an alkyl radical having from 1 to 12 carbon atoms, a cycloalkyl radical having from 5 to 12 carbon atoms, or an aryl radical having from 6 to 12 carbon atoms wherein the aryl radical may contain a halogen atom, a hydroxyl group, or an amino group, and M+ is a metal ion or an ammonium ion.

On prépare un milieu d'enregistrement magnétique en appliquant une composition de revêtement magnétique sur un support non magnétique et en la faisant durcir. Cette composition contient des particules ferromagnétiques dispersées dans un liant contenant une résine thermoplastique. Cette résine est choisie parmi le groupe constitué par les polyuréthanes et les polyesters, dans lesquels au moins un aminoalkylphosphonate, représenté par la formule (voir figure I), est lié chimiquement à cette résine. Dans cette formule : R1 et R2 sont des radicaux oxyalkylènes en C2-C12, identiques ou différents; R3 est est un radical alkylène en C2-C12 ou un radical aralkylène en C7-C10; R4 est un radical alkyle en C1-C12, un radical cycloalkyle en C5-C12 ou un radical aryle en C6-C12, ce dernier pouvant contenir un atome d'halogène, un groupement hydroxyle ou un groupement amino; et M+ est un ion métallique ou ammonium.

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