Yellow iron oxide pigment and method for manufacture thereof

Details Yellow iron oxide pigment and method for manufacture thereof Yellow iron oxide pigment and method for manufacture thereof

1982-08-31

1984-07-10

McCarthy, Helen M.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

106304, C01G 4902, C09C 124

Patent

active

044592760

ABSTRACT:
Yellow iron oxide crystals having lengths in the range of 100 to 1000 nm and a major axis/motor axis length ratio in the range of 1.5 to 4.5 are produced by adding an aqueous ferric salt solution to an aqueous alkali solution, causing the two solutions to react with each other at a temperature in the range of -5.degree. to 30.degree. C. thereby inducing precipitation of iron hydroxide, allowing the precipitate to age, then subjecting the aged precipitate to a hydrothermal treatment thereby producing crystals and, when necessary, further allowing the crystals to grow.

REFERENCES:
patent: 3969494 (1976-07-01), Nobuoka et al.
patent: 3974267 (1976-08-01), Urban
patent: 4251504 (1981-02-01), Hamabata et al.
patent: 4339425 (1982-07-01), Tokuoka
patent: 4349456 (1982-09-01), Sowman

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