Magnetic recording medium in which an N-acylsarcosine derivative

Details Magnetic recording medium in which an N-acylsarcosine derivative Magnetic recording medium in which an N-acylsarcosine derivative

1978-04-10

1979-05-08

Robinson, Ellis P.

Stock material or miscellaneous articles

Metal continuous phase interengaged with nonmetal continuous...

252 6251, 252 6252, 252 6253, 252 6254, 428425, 428426, 428457, 428480, 428475, 428522, 428524, 428900, 428537, H01F 102

Patent

active

041537548

ABSTRACT:
The invention relates to a magnetic recording medium, for example a magnetic tape, which comprises a carrier and a magnetizable coating provided thereon which comprises a binder as well as a magnetic pigment dispersed in the binder by means of a dispersing agent. As a dispersing agent is used an N-acylsarcosine derivative. Herewith an optimum dispersion of the pigment in the binder is obtained in a short dispersion time. An excess of dispersing agent serves as a lubricant upon migration. The acyl group comprises preferably an aliphatic or olefinic hydrocarbon chain having 12-22 carbon atoms. Furthermore are to be preferred salts of N-acrylsarcosine, in particular metal salts, alkali metal salts, alkaline earth metal salts and amine salts.

REFERENCES:
patent: 3647539 (1972-03-01), Weber
patent: 3687725 (1972-08-01), Hartmann
patent: 3804810 (1974-04-01), Fryd
patent: 4020236 (1977-04-01), Aonuma
patent: 4063000 (1977-02-01), Aonuma

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