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Polymeric materials are normally colored with inorganic pigments. These provide a good color stability to light, oxygen and heat. As regards color and color intensity, however, these pigments have their limitations. In addition, inorganic pigments are less desirable for environmental reasons.
Organic pigments not only offer a wider range of color possibilities with higher intensities, but are also broken down faster and better in the environment, for instance under the influence of oxygen. A major disadvantage of organic dyes, however, is that they have a relatively low temperature and UV stability. Moreover, these substances exhibit the tendency to leach out when substrates colored with them are used.
The object of the present invention is to provide a coloring pigment which combines the advantages of the known organic pigments with those of the known inorganic coloring pigments, and with which polymeric materials can be colored in an efficient, homogeneous manner. Contemplated is a class of coloring pigments with which a large number of diverse colors of high intensity can be given to a polymer substrate, which coloring pigments can be broken down properly and fast in the environment.
The coloring pigment is suitable in particular for coloring substrates of polymeric material. It is possible both to color bulk material and to color a covering layer or coating of a polymeric material.
The object can be achieved by preparing a coloring pigment in a specific manner from an organic dye and a clay. The invention provides a method for preparing a coloring pigment, wherein an anionic or cationic clay, which clay contains substantially no agglomerates of clay sheets, is subjected to an ion exchange with an organic dye.
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