Magnetic recording vehicle - comprising a magnetic pigment dispersion in a copolymer forming a hard coating

    公开(公告)号:DE2060214A1

    公开(公告)日:1972-06-15

    申请号:DE2060214

    申请日:1970-12-08

    Applicant: BASF AG

    Abstract: A magnetic recording vehicle is mfd. by preparing a dispersion of a finely divided magnetic pigment (eg. gamma-Fe(III)-oxide) in a binder based on a copolymer of monoolefinically unsatd. monomers and an inert solvent (eg. toluene), with opt. admixture of usual additives; applying a layer of the dispersion onto a substrate (eg. a PVC or polyester film or tape) and drying or hardening. The copolymer used forms hard coatings and contains (A) 5-40 wt.% of units of formula R(CH2)C-X-Y-O-CO-CH2-Z (where X is COO or S; Y is divalent aliphatic 2-12 C (oxa)hydrocarbon; Z is COCH2 or CN; and R is R when X is S, or H or CH3 when X is COO; and (B) 60-95 wt.% of units of acrylates and/or methacrylates which may be replaced by up to 30% units of other comonomer units. Good abrasion resistance hence long service life.

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