Blue shade Fe-Cr black

Details Blue shade Fe-Cr black Blue shade Fe-Cr black

2000-09-28

2001-05-22

Green, Anthony (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

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

C106S170580, C106S198100, C106S459000, C524S407000, C423S594120

Reexamination Certificate

active

06235106

ABSTRACT:

FIELD OF THE INVENTION
The present invention generally relates to various aspects related to blue shade black pigments containing iron and chromium. In particular, the present invention relates to blue shade black pigments having desirable weathering characteristics, methods of making the blue shade black pigments, plastics and other materials containing the blue shade black pigments, and methods of using the blue shade black pigments.
BACKGROUND OF THE INVENTION
Iron oxide is often used with other components to make black Complex Inorganic Color Pigments (CICP). A CICP is a pigment made by heating a number of different metal oxides. Relatively large, coarse, and/or hard particles often lead to problems in some CICP applications.
The large, coarse, and/or hard CICP particles may be employed in substances such as concrete. However, CICP particles used for coloring coatings, plastics, lacquers and synthetic resins are typically subjected to intensive grinding. The disadvantages associated with intensive grinding include the undesirable formation dust, difficulties in measuring the ground CICP particles, and difficulties in dispensing with the ground CICP particles.
Moreover, in order for CICP particles used for coloring coatings, plastics, lacquers and synthetic resins, high temperature stability is required since these materials are often processed or exposed to high temperatures. As a result, black pigments based upon Fe
3
O
4
cannot be used for coloring coatings, plastics, lacquers and synthetic resins. This is because Fe
3
O
4
is oxidized to brown or red Fe
2
O
3
at high temperatures, such as above 180° C.
Most black CICP formulations have one or two desirable properties as well as several undesirable properties. For example, some black pigments are strong, but have poor weathering characteristics, poor heat resistance, undesirable brown, red and/or yellow shades, and/or costly starting materials. Specifically, PBK 30 is strongly black, but is expensive since it contains nickel. PBK 30 also has improvable weathering characteristics.
Given these circumstances, when employing a black CICP formulation, one must accept a compromise on at least one desirable property. There is thus an unmet need in the art for a black CICP formulation having many desirable properties.
SUMMARY OF THE INVENTION
The present invention provides black CICP formulations that possess high pigment strength, good weathering characteristics, high temperature resistance, and a blue shade. The black CICP formulations of the present invention possess many desirable characteristics thus minimizing the compromises typically required when selecting a black pigment.
One aspect of the invention relates to a blue shade black pigment composition, containing at least iron oxide, chrome oxide, wherein the ratio of iron to chromium is from about 1:1 to about 5:1 by weight; and manganese oxide.
Another aspect of the invention relates to a method of making a blue shade black pigment involving combining iron oxide, chrome oxide, and manganese oxide to form a mixture; heating the mixture to a temperature from about 700° C. to about 1,300° C. for a time from about 1 to about 5 hours; and optionally agitating the heated mixture to provide the blue shade black pigment.
Yet another aspect of the invention relates to a plastic composition containing a plastic material and a blue shade black pigment composition containing at least iron oxide, chrome oxide, and manganese oxide.


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