Crystal polymorphs of a yellow disazo colorant, and their preparation
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United States of America Patent
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Jan 7, 2003
Grant Date -
May 30, 2002
app pub date -
Sep 13, 2001
filing date -
Sep 15, 2000
priority date (Note) -
Expired
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Abstract
The invention relates to six new crystal polymorphs, .alpha. (alpha), .beta. (beta), .gamma. (gamma), .delta. (delta), .zeta. (zeta), and .eta. (eta), of the disazo colorant of the formula I, ##STR1## having characteristic reflections in the X-ray diffraction spectrum. The novel crystal polymorphs are prepared by treatment in organic solvents.
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