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US6447552B1
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Process for the preparation of stable aqueous hair dyeing emulsions
Assignee: Kao Germany GmbH
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Filing: 1999-03-19
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Granted: 2002-09-10
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Expires: 2019-03-19
Abstract
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.
Inventors
- 👤 Frank Golinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:56
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/02; A61K8/04; A61K8/06; A61Q; A61Q5/00; A61Q5/10; Y; Y10; Y10S; Y10S8/00; Y10S8/902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
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.
Claim 2
Dependent Claim
105 words
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.
Claim 3
Dependent Claim
21 words
Process according to claim 1 , wherein the oily phase is prepared at a temperature ranging from 45° to 70° C.
Claim 4
Dependent Claim
28 words
Process according to claim 1 , wherein the stable aqueous hair dyeing emulsion has a viscosity between 2,500 and 25,000 mPa.s at 20° C. in a Brookfield-Viscometer RVT.
Claim 5
Dependent Claim
26 words
Process according to claim 3 , wherein the hair dyeing emulsion has a viscosity between 5,000 and 20,000 mPa.s at 20° C. in a Brookfield-Viscometer RVT.
Claim 6
Dependent Claim
16 words
The method of claim 1 , wherein step (c) consists of mixing for about 1-3 minutes.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-09-09 | 2006-03-11 | 2006-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-09-09 | 2010-03-11 | 2010-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-09-09 | 2014-03-11 | 2014-09-10 | $7700.00 | Window Closed / Lapsed |