Process for producing acicular .gamma.-FeOOH particles

Details Process for producing acicular .gamma.-FeOOH particles Process for producing acicular .gamma.-FeOOH particles

1995-03-06

1996-07-02

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423632, 252 6256, C01G 4906

Patent

active

055319777

ABSTRACT:
Acicular .gamma.-FeOOH particles useful as precursors for magnetic particles suitable for magnetic recording are produced advantageously in industry. In a reaction of the growth of .gamma.-FeOOH nuclei by oxidizing a suspension containing .gamma.-FeOOH nuclei in a ferrous salt solution while neutralizing with alkali, a phosphorus compound is added to the reaction mixture at the time before the end of said reaction and when the ratio of Fe.sup.++ /total Fe in the reaction mixture is 0.15 or less.

REFERENCES:
patent: 3382174 (1968-05-01), Hund
patent: 4061725 (1977-12-01), Ohlinger et al.
patent: 4176172 (1979-11-01), Bennetch et al.
patent: 4295879 (1981-10-01), Steck et al.
patent: 4713261 (1987-12-01), Masaki et al.
patent: 4729785 (1988-03-01), Schwab et al.

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