Process for the production of yellow-brown zinc ferrite pigments

Details Process for the production of yellow-brown zinc ferrite pigments Process for the production of yellow-brown zinc ferrite pigments

1985-03-14

1987-07-21

Lieberman, Paul

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106296, 106309, C09C 162

Patent

active

046816372

ABSTRACT:
A process for the production of an anisometric yellow-brown zinc ferrite pigment comprising homogeneously mixing zinc oxide having a specific BET surface of more than 2 m.sup.2 /g with needle-shaped .alpha.-FeOOH obtained from an iron salt solution by mixing with alkali and subsequently oxidizing in a nucleation and pigment growth stage, the FeOOH having a specific BET surface of about 15 to 25 m.sup.2 /g, an average needle width of about 0.025 to 0.125 .mu.m and an average needle length of about 0.2 to 0.6 .mu.m, annealing the mixture at a temperature of about 700.degree. to 1000.degree. C., cooling and grinding.

REFERENCES:
patent: 2904395 (1959-09-01), Downs et al.
patent: 3382174 (1968-05-01), Hund et al.
patent: 3576656 (1971-04-01), Webb et al.
patent: 3832455 (1974-08-01), Smith et al.
patent: 4222790 (1980-09-01), Dickerson
patent: 4261966 (1981-04-01), Portes et al.
patent: 4459276 (1984-07-01), Nobuoka et al.
patent: 4491619 (1985-01-01), Biermann et al.
Chemical Abstracts 6001, vol. 95, 12/81, No. 24, p. 82.

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