Temperature-resistant black pigment, a process for its...

Details Temperature-resistant black pigment, a process for its... Temperature-resistant black pigment, a process for its...

C - Chemistry, Metallurgy

09

D

C09D 17/00 (2006.01) C01G 49/00 (2006.01) C09C 1/00 (2006.01) C09C 1/22 (2006.01)

Patent

CA 2072667

A TEMPERATURE-RESISTANT BLACK PIGMENT, A PROCESS FOR ITS PRODUCTION AND ITS USE ABSTRACT OF THE DISCLOSURE A temperature-resistant blank pigment which is a mixed oxide of manganese and iron with the structure of hematite and having a manganese content of 3 to 35% by weight, and with absolute color values in colorimetric testing in paint systems, expressed in CIELAB units, in the lightened form (Blend of 10 parts titaniumdioxide and 1 part of black pigment) of 60 to 70 for L*, -0.5 to 1.9 for a* and -4 to -6.5 for b* useful for coloring autoclave- cured building materials and for pigmenting heat-resistant paint systems is obtained by preparing a precursor material of manganese and iron oxides or hydroxides, which contains the phase with the structure of spinel and calcining that precursor material in an oxidizing atmosphere at 500 to 1,000°C. Le A 28 211-Foreign countries

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