Process for the preparation of stable aqueous hair dyeing emulsions
AssigneeGoldwell GmbH
InventorFrank Golinski
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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° and 80° 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° and 30° C. Compared to conventional processes of hot emulsification, this process substantially reduces the preparation time.
Claims5
Process for the preparation of stable aqueous hair dyeing emulsions comprising at least one oxidation dyestuff precursor, comprising the steps of:
- (a) first preparing a homogenous oily phase from oil components comprising at least one oil-soluble emulsifier and an oil, by mixing the oil components at a temperature between 40° and 80° C.,
- (b) cooling the oily phase to a temperature between about 15° and 30° C.
- (c) subsequently mixing the oily phase with an aqueous phase comprising at least one water-soluble emulsifier, under shearing force, at a temperature between 15° and 30° C., and wherein the emulsion contains at least one oxidation dyestuff precursor.
Dependencies are inferred from the claim text.