Granular pigments useful to color concrete
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United States of America Patent
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Jul 6, 2004
Issued Date -
N/A
app pub date -
Jun 20, 2002
filing date -
Jun 20, 2002
priority date (Note) -
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Abstract
A method for the preparation of pigment granules includes mixing at least one pigment selected from the group consisting of iron oxide and chromium oxides with 1-25 wt. % water to form a damp powder. The damp powder is then pressure extruded through at least one die to form granules. The granules are then dried so that the final water content of the granules is less than about 1%, crumble and sieved to form the final product.
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