Class of dispersants for magnetic recording coatings

Details Class of dispersants for magnetic recording coatings Class of dispersants for magnetic recording coatings

C - Chemistry, Metallurgy

07

F

117/24.4, 260/36

C07F 9/09 (2006.01) G11B 5/70 (2006.01)

Patent

CA 1324149

ABSTRACT This invention relates to the preparation of the magnetic particle dispersants for improving the high density magnetic recording binder system. The dispersants are prepared by reacting an organophosphate ester or a carboxylated polyester compound with a liquid low molecular weight bisphenol-A epoxy, under a well defined condition to convert the unreacted acid groups to epoxy ester groups. Using this end-product as a dispersion aid in the magnetic coating formulation enhances the loading and dispersibility of the magnetic particles. This dispersant additive also improves the polymer-particle compatibility which further enhances the ink stability and processability for thinner disk coating.

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