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Enhancing the color perception of artificially colored hair

The Procter & Gamble Company (Cincinnati, OH)

United States Patent 7,335,236

Summary

The invention herein encompasses the use of aminosilicones to enhance the colour perception of artificially coloured hair. Also encompassed are compositions, a method of use, a kit-of-parts and an article of manufacture.

Silicones are generally formulated as emulsions, however the inventors claim to have found that the benefit and its duration are maximised if the silicone used is provided as a composition that is a solution of the aminosilicone. This optical improvement/colour is described as "increased colour intensity", "improved colour benefit", "chroma shift", "increase colour tonality", "increased colourfulness", "increased colour brightness", "increased colour vibrancy", "increased colour richness", etc.

The CIE L C h colour system is used as a standard method of measuring colour (ref: Industrial Colour Testing, p20, by Hans G. Volz, ISBN 3-527-30436-3). Using this method it is possible to assess the improvement in optical properties of hair fibres by monitoring the L and C values using for example a handheld spectrophotometer such as Minolta 3600d, which is based on diffuser measurement geometry. However, a more useful measure employed herein is the use of the Kubelka-Munk function K/S. This value is also an accepted method for assessing the colourimetric properties of materials (ref: Industrial Colour Testing, p98, by Hans G. Volz, ISBN 3-527-30436-3).

The aminosilicones useful in the present invention include molecules having the following structure:

Formulation Example 1 – Amino Silicone Solution

% in / % in
Material / composition 1 / composition 2
ADM1100 (Supplied by Waker Co) / 30 / 5
DC200 (5 cSt) (Supplied by Dow Corning / 70 / 95

Formulation Example 2 – Amino Silicone Solution

% in / % in
Material / composition 3 / composition 4
DC2-8566 (Supplied by Dow Corning) / 20 / 10
Permethyl 99 (supplied by Chesham Chemicals Limited) / 80 / 90

6 g of examples 1 and 2 is then applied to the artificially coloured hair.

Laboratory Needs:

Formulation: Pyrex glass beakers , heat insulated gloves, safety goggles, pH indicator paper or probe, spatulas, storage jars, aluminum foil and untreated virgin hair tresses.

Laboratory Equipment: A mechanical agitator with support and fastener, mixing blades to fit inside the diameter of the glass beaker, thermometer and hot plate with temperature control, top load balance with auto calibration and tare.

A mechanical agitator Mixing blades Thermometer and hot plate top load balance

Viscometer pH Meter

Warning: Read the material safety data sheets, MSDS, of all formulation ingredients to determine special handling precautions. Prepare this formulation in a well ventilated laboratory:

·  This formulation may require handling heated or corrosive liquids and severe burning may occur.

·  Do not breath fumes

·  Wear gloves and goggles

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