Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
1998-12-18
2001-04-24
Bell, Mark L. (Department: 1755)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C106S400000, C106S401000
Reexamination Certificate
active
06221147
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to pigments for plastics, glasses and other types of materials, and more particularly relates to bismuth manganese oxide pigments.
BACKGROUND INFORMATION
Pigments are widely used in various applications such as paints, inks, plastics, rubbers, ceramics, enamels and glasses. For example, U.S. Pat. No. 5,336,612 to Byrne et al. discloses bismuth-containing colorants.
SUMMARY OF THE INVENTION
The present invention provides bismuth manganese oxide pigments which may be used as additives to plastics, plastic or organic coating compositions, textiles, glass and ceramic coating compositions, and the like. The bismuth manganese oxide pigments preferably comprise Bi
2
Mn
4
O
10
having an orthorhombic crystal structure. The pigments provide improved heat buildup properties.
The bismuth manganese oxide pigments of the present invention may be used in many applications such as automotive and marine paints, and colored plastics such as vinyl siding, where one property of the bismuth manganese oxide pigments is very high infrared reflectance. These infrared reflective properties exhibit much less heat buildup and much higher infrared radiation reflectance in comparison with commercial black pigments.
Another use is in the ceramic industry in applications such as enamel borders around windshields, back lights, etc. used for automobiles to enhance appearance and to prevent ultraviolet (UV) degradation of underlying adhesives.
Compositions including the present bismuth manganese oxide pigments also have advantages in architectural, container, and other glass or ceramic decorative applications where reduced heat buildup is desired.
Another property exhibited by the present bismuth manganese oxide pigments is the ability to render a surface markable when exposed to a laser, allowing the formation of a high contrast mark with minimal disruption of the surface. Some laser marking uses would be in plastics, organic coatings, metal marks, and any other type of similar mark which can be made readable by interaction with the laser beam.
An aspect of the present invention is to provide a pigment comprising bismuth manganese oxide. The bismuth manganese oxide preferably comprises Bi
2
Mn
4
O
10
having an orthorhombic crystal structure.
Another aspect of the present invention is to provide a coating composition including a liquid carrier and a pigment comprising bismuth manganese oxide dispersed therein.
A further aspect of the present invention is to provide an enamel composition comprising glass frit and bismuth manganese oxide pigment.
Another aspect of the present invention is to provide an article including a substrate matrix and bismuth manganese oxide pigment dispersed in the matrix.
A further aspect of the present invention is to provide an article including a substrate and a coating comprising a bismuth manganese oxide pigment covering at least a portion of the substrate.
Another aspect of the present invention is to provide a method of making a bismuth manganese oxide pigment. The method includes the steps of mixing powders of bismuth oxide and manganese oxide and calcining the mixture.
A further aspect of the present invention is to provide a method of coloring a substrate. The method includes the steps of providing a substrate, and adding a bismuth manganese oxide pigment to the substrate. The bismuth manganese oxide pigment may be dispersed in the substrate or coated on the substrate.
These and other aspects of the present invention will be more apparent from the following description.
REFERENCES:
patent: 5336312 (1994-08-01), Byrne et al.
patent: 5747395 (1998-05-01), Smith et al.
Baidikova et al. “Characterization of bismuth-manganese oxide . . . ” Appl. Catal., A, 89(2), 169-82, Sep. 1992.*
Tutov et al., “New Compounds in the Systems Bi2O3-Me2O3(Fe3+, Al3+, Ga3+, Mn3+)”,Soviet Physics—Solid State, Oct. 1964, pp. 963-964, vol. 6, No. 4.
Baidikova et al., “Oxidative Dehydrodimerization of Methane on Bi-Mn Oxides: Catalysts Active Component and Reaction Mechanism”,Catalysts Today, 1992, pp. 511-516, vol. 13.
Novotny Miroslav
Sakoske George Emil
Sarver Joseph E.
Bell Mark L.
Cerdec Aktiengesellschaft Keramischre Farben
DiVerdi Michael J.
Eckert Seamans Cherin & Mellot LLC
Tower Alan G.
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