Magnetic recording binder containing aminoalkylphosphonate salt

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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528 71, 528 72, C08G 63692

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active

056819196

ABSTRACT:
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: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different oxyalkyl radicals having from 2 to 12 carbon atoms, R.sup.3 is an alkylene radical having from 1 to 12 carbon atoms, or an aralkylene radical having from 7 to 10 carbon atoms R.sup.4 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.sup.+ is a metal ion or an ammonium ion.

REFERENCES:
patent: 2635112 (1953-04-01), Fields et al.
patent: 4803230 (1989-02-01), Moroni et al.
patent: 5254432 (1993-10-01), Aoai
Encyclopedia of Polymer Science; vol. 13; 1988; p. 259.

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