Dispersions of magnetic particles and dispersants therefor

Details Dispersions of magnetic particles and dispersants therefor Dispersions of magnetic particles and dispersants therefor

C - Chemistry, Metallurgy

08

G

31/106, 117/24.4

C08G 63/08 (2006.01) B01F 17/00 (2006.01) B01F 17/36 (2006.01) C08G 63/682 (2006.01) C08K 3/22 (2006.01) G11B 5/70 (2006.01) G11B 5/702 (2006.01)

Patent

CA 1252799

ABSTRACT A dispersion of finely divided particles of a magnetic material in an organic liquid containing a dispersant comprising an amine carrying a poly(carbonylalkyleneoxy) chain (PCAO chain) in which the alkylene groups contain up to 8 carbon atoms, or an acid- salt thereof. The dispersion is useful for the preparation of magnetic recording media such as video, audio and computer recording tapes and discs. Certain of the dispersants are novel, especially a polyethyleneimine carrying at least two PCAO chains.

472741

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