Engelhard Corporation

The Harshaw Chemical Company

Basf Catalysts LLC

Jerome David Thomas

Mark Edward Gall

William Gerald Loucka

Norman G Wolcott, Jr

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&deg; C. to about 1,300&deg; 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.

Blue shade Fe-Cr black

A novel medium for a glass enamel consists essentially of at least 50, preferably at least 80, weight percent polyether glycols, solid at room temperature, having a weight average molecular weight in the range of 2000 to 9000, the remainder of the medium being incompatible vinyl-type polymers, solid at room temperature, having a viscosity at 140.degree. C. less than 1000 cps., preferably less than 500 cps. This medium is used in a minor amount with extenders, together with pigments, stabilizers, leveling agents and other additives, as desired, to make novel glass enamels useful for non-smearing patterns on glass which is to be subsequently coated with hot resins. However, this medium is equally useful in vitrifiable systems.

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Eastlake, OH, United States of America

Jerome David Thomas