Method for producing purified ultraviolet ray absorbing agent
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United States of America Patent
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Issued Date -
Oct 27, 2005
app pub date -
Nov 15, 2004
filing date -
May 27, 2002
priority date (Note) -
Abandoned
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Abstract
An object of the present invention is to provide a production method for a purified ultraviolet absorbing agent having less odor, excellent safety, as well as improved hue, which has improved industrial productivity (production cost), fewer production processes, improved safety during production, and less effect on the environment. In order to achieve this object, the present invention provides a production method for a purified ultraviolet absorbing agent comprising an absorbent treatment process in which an ultraviolet absorbing agent is contacted directly with an absorbent without using a solvent.
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