Iron blue nacreous pigments

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter

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Details

106291, 106299, 106300, 106304, 106308B, 428404, B32B 1900, C09C 100

Patent

active

043094805

ABSTRACT:
An iron blue coated substrate nacreous pigment which yields less than ten parts per million of water-soluble cyanide due to the stability thereof to heat during drying is prepared by the admixing of the substrate, ferric ion reactant, and ferrocyanide reactant under conditions such that the ferric ion and ferrocyanide reactants are in substantially stoichiometric proportions and the pH is at constant value within the range of 2.5-4.0, and adding an aluminum-containing reactant so as to form aluminum hydroxide in addition to the iron blue on said substrate. The product shows a brighter, cleaner, and purer blue color than iron blue coated substrate products prepared by other procedures.

REFERENCES:
patent: 3087827 (1963-04-01), Klenke et al.
patent: 3087828 (1963-04-01), Linton
patent: 3087829 (1963-04-01), Linton
patent: 3951679 (1976-04-01), Bernhard et al.
patent: 4047969 (1977-09-01), Armanini et al.

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