Process for the preparation of stable aqueous hair dyeing emulsions
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United States of America Patent
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Sep 10, 2002
Grant Date -
N/A
app pub date -
Mar 19, 1999
filing date -
Apr 6, 1998
priority date (Note) -
Expired
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Abstract
A simplified process is presented for the preparation of stable, aqueous hair dyeing emulsions, comprising at least one oxidation hair dyestuff precursor, by first preparing a homogenous oily phase comprising at least one oil-soluble emulsifier by mixing the oil components at an increased temperature between 40.degree. and 80.degree. C., and subsequently mixing this oily phase with an aqueous phase, comprising at least one water-soluble emulsifier under shearing force at a temperature between 15.degree. and 30.degree. C. Compared to conventional processes of hot emulsification, this process substantially reduces the preparation time.
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