US5100436A
Expired / Lapsed
US
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Oxidative hair dyeing process with catalytic pretreatment
Assignee: P&G Hair Care Holding Inc
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Filing: 1991-03-07
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Granted: 1992-03-31
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Expires: 2011-03-07
Abstract
Abstract In a method for oxidatively dyeing hair, a pretreatment which comprises contacting hair with an aqueous solution of an effective amount of particular metal/chelate complexes followed by treatment with oxidative dye mixtures is disclosed. The process serves to conform the oxidative dyeing rate of virgin hair to that of the normally noncongruent rate of nonvirgin hair, so as to enhance the efficiency of the oxidative dyeing process, without reducing the intensity or variety of color available.
Inventors
- 👤 Gottfried Wenke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:54
CPC Classifications
A; A61; A61Q; A61Q5/00; A61Q5/10; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/30; A61K8/49; A61K8/4906; A61K8/4926; A61K2800/00; A61K2800/40; A61K2800/51
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A method for dyeing hair having virgin and nonvirgin hair portions in an oxidative hair dyeing process, comprising: (a) contacting the hair with an aqueous solution of a transition metal ion complexed with a chelating agent selected from the group consisting of 2,2'-dipyridyl and o-phenanthroline, present at a concentration sufficient to effect deposition of the complex on the hair, said contact being for a period of time to deposit a noncoloring, catalytically effective amount of said complex on the hair; and (b) contacting the catalytically treated hair with an oxidative hair dye mixture comprising dye precursors and an oxidant for a period of from 5 to 30 minutes, whereby the time to produce a desired shade of color in the hair is substantially reduced and the color imparted to the virgin and nonvirgin hair portions is substantially uniform.
Claim 2
Independent Claim
138 words
A method for dyeing hair having virgin and nonvirgin hair portions in an oxidative hair dyeing process, comprising: (a) contacting the hair with an aqueous solution of a transition metal ion complexed with a chelating agent selected from the group consisting of 2,2'-dipyridyl and o-phenanthroline, present at a concentration sufficient to effect deposition of the complex on the hair, said contact being for a period of time to deposit a noncoloring, catalytically effective amount of said complex on the hair; and (b) contacting the catalytically treated hair with an oxidative hair dye mixture comprising dye precursors and an oxidant for a period of from 5 to 30 minutes, whereby the time to produce a desired shade of color in the hair is substantially reduced and the color imparted to the virgin and nonvirgin hair portions is substantially uniform.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the transition metal is copper-II.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the amount of metal deposited onto the hair is from about 100 to about 1000 ppm.
Claim 5
Dependent Claim
22 words
The method of claim 2 wherein the amount of copper deposited on the hair is from about 100 to about 1000 ppm.
Claim 6
Dependent Claim
36 words
The method of claim 1 wherein the concentration of metal/chelate complex in aqueous solution required to effect a catalytic effective deposition onto the hair is from about 0.001 to about 0.1% by weight of the solution.
Claim 7
Dependent Claim
12 words
The method of claim 5 wherein the transition metal is copper II.
Claim 8
Dependent Claim
11 words
The method of claim 6 wherein the concentration is about 0.01%.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein step (b) is conducted at a pH of about 6 to about 8.5.
Claim 10
Dependent Claim
11 words
The method of claim 1 wherein the oxidant is hydrogen peroxide.
Claim 11
Dependent Claim
17 words
The method of claim 9 wherein the concentration of hydrogen peroxide may be as low as 0.1%.
Claim 12
Dependent Claim
24 words
The method of claim 1 wherein the period for contacting the hair with the oxidative hair dye composition is from 5.0 to 15.0 minutes.
Claim 13
Dependent Claim
11 words
The method of claim 1 wherein only virgin hair is treated.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |