Dispersion

Details Dispersion Dispersion

1985-02-01

1987-02-24

Demers, Arthur P.

Compositions

Magnetic

Chromium or chromium compound containing

252 6253, 252 6254, 252356, 252357, 524190, 525417, 525437, 528332, 528361, H01F 102, B01F 1752

Patent

active

046456112

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.

REFERENCES:
patent: 3778287 (1973-12-01), Stansfield et al.
patent: 4153754 (1979-05-01), Huisman
patent: 4224212 (1980-09-01), Topham
patent: 4398955 (1983-08-01), Stansfield
patent: 4518435 (1985-05-01), Stansfield et al.
D-1, "The Wetting of Magnetic Pigment", given at a symposium in Hawaii in May 1983 by Lawrence B. Lueck, President, Magnetic Media Information Services, Tokyo, Japan.

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