Production of hematite pigments in the form of platelets

Details Production of hematite pigments in the form of platelets Production of hematite pigments in the form of platelets

1990-08-23

1993-09-14

Lewis, Michael

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423592, 423594, 106415, 106456, 106459, C01G 4906

Patent

active

052446492

ABSTRACT:
Iron oxides in the form of platelets are produced by hydrothermal treatment of aqueous suspensions containing iron(III) hydroxide or oxide hydrates in the presence of alkali metal hydroxides and of aluminum and/or silicon compounds in two stages. The normality of the alkali is from 0 2 to 2 N in the first stage and is increased by from 0.2 to 2.5 in the second stage.
The two-stage process according to the invention makes it possible to produce hematite pigments which are in the form of platelets, have increased luster, larger particle diameter, improved dispersibility and color hues which can be adjusted as desired.

REFERENCES:
patent: 3987156 (1976-10-01), Nobuoka
patent: 4289746 (1981-09-01), Hayakawa et al.
patent: 4373963 (1983-02-01), Uenishi et al.
patent: 4376656 (1983-03-01), Senda et al.
patent: 4404254 (1983-09-01), Franz et al.
patent: 4676838 (1987-06-01), Franz et al.
patent: 4826537 (1989-05-01), Ostertag
Derwent Publications, Abstract of JP 57057755 (Sep. 26, 1980).

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