Stock material or miscellaneous articles – Composite – Of carbohydrate
Patent
1977-05-16
1978-04-04
Douglas, Winston A.
Stock material or miscellaneous articles
Composite
Of carbohydrate
106304, 106308B, 428539, 252 6256, 252 6258, 252 6260, 252 6262, C09C 124
Patent
active
040829057
ABSTRACT:
An Fe.sub.3 O.sub.4 iron oxide black pigment having incorporated therein up to about 50 mole percent of .gamma.-Fe.sub.2 O.sub.3 plus Me Fe.sub.2 O.sub.4 (wherein Me is at least one of magnesium, manganese, cobalt, nickel, aluminum, chromium, titanium, copper, zinc and cadmium) having a specific surface according to BET of greater than about 12 m.sup.2 /g, up to about 10% by weight of a substantially insoluble inorganic compound as coating and a stability to oxidation with air under standardized conditions of greater than about 130.degree. C. Advantageously the coating comprises at least one of zinc hydroxide, zinc phosphate, zinc phosphite, aluminum phosphate and silica, being precipitated onto the suspended pigment from a solution. The resulting pigments are of improved resistance to oxidation, rendering them especially useful for pigmenting inorganic and organic dispersions and for use on magnetogram supports.
REFERENCES:
patent: 3873461 (1975-03-01), Mollard et al.
patent: 3931025 (1976-01-01), Woditsch et al.
Holznagel Wilhelm
Hund Franz
Stephan Bernd
Bayer Aktiengesellschaft
Douglas Winston A.
Howard J. V.
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