Dry coloring master batch having a high pigment content and manufacturing process
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United States of America Patent
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Apr 9, 2002
Grant Date -
N/A
app pub date -
Mar 31, 1999
filing date -
Apr 1, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
Dry master batch comprising at least one pigment and a dispersion carrier, characterized in that it contains at least 80% by weight calculated on the weight of the mixture of particles of pigment dispersed in said carrier; it can be prepared by means of a process that comprises the steps of feeding a flow of pigment obtained from a process of synthesis in aqueous or organic phase in the form of a filter pressed, tape pressed or centrifuged wet cake and a flow of a solution of a dispersant carrier in a turbo-mixer, centrifuging such flows against the inner wall of said turbo-mixer, with the formation of a dye paste arranged in a thin and dynamic layer; drying the dye paste obtaining said dry master batch, which is particularly suited for the preparation of inks and paints or for the pigmentation of plastic materials.
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