Orthorhombic lead chromate pigments of greenish hue

Details Orthorhombic lead chromate pigments of greenish hue Orthorhombic lead chromate pigments of greenish hue

1987-03-03

1989-10-10

Lieberman, Paul

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106432, 106453, 106493, C09C 120

Patent

active

048729159

ABSTRACT:
The invention relates to orthorhombic lead chromate pigments of greenish hue, which contain lead chromate and lead sulfate in the weight ratio of 60:40 to 100:0, and which are characterized by a tinctorial strength of 0.067 to 0.103 at a standard depth of shade of 1/25 in accordance with DIN 53 235 and by an opacity factor Y.sub.black /Y.sub.white of 0.78 to 0.87. These pigments are obtainable by mixing an aqueous solution of a chromate and, if necessary, of a sulfate, under high turbulence.

REFERENCES:
patent: 3370971 (1968-02-01), Linton
patent: 3639133 (1972-02-01), Linton
patent: 3923538 (1975-12-01), Jackson
patent: 4046588 (1977-09-01), Einerhand et al.
patent: 4505954 (1985-03-01), Hokamura et al.
DIN 53235.
DIN 5033.
H. Kittel, "Pigmente", 1960, 278-279.

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