Composition for dyeing human hair
View Patent ↗This invention relates to a hair dyeing composition showing excellent dyeing ability comprising at least one direct acting hair dye and benzylurea and/or benzyl carbamate and/or N-(2-methoxybenzyl)urea. The direct acting hair dyes are preferably selected from anionic, acidic dyestuffs. In addition to benzylurea and/or benzyl carbamate and/or N-(2-methoxybenzyl)urea compositions further comprise organic solvents as penetration enhancers. Compositions according to the invention has a pH in the range from 1 to 5 and preferably comprises polymeric thickening agents, organic and/or inorganic acids and conditioning agents.
1. A colouring composition for hair, comprising
(a) benzylurea; and
(b) at least one direct acting, acidic, anionic dyestuff.
2. The colouring composition for hair according to claim 1 , wherein component (a) is present at a concentration of 0.1-10% by weight, calculated to the total composition.
3. The colouring composition for hair according to claim 1 , wherein the dyestuff is present at a concentration of 0.001-5% by weight calculated to the total composition.
4. The colouring composition for hair according to claim 1 , further comprising organic solvents.
5. The colouring composition for hair according to claim 1 , wherein the pH of the composition is in the range from 1 to 5.
6. The colouring composition fix hair according to claim 1 , further comprising organic or inorganic acids or their mixtures.
7. The colouring composition for hair according to claim 1 , further comprising at least one physiologically compatible hair conditioning agent selected from oily substances, non-ionic substances, cationic amphiphilic compounds, cationic polymers and their mixtures.
8. The colouring composition for hair according to claim 1 , further comprising polymeric thickening agents.
9. The colouring composition for hair according to claim 1 , having a viscosity from 1,000 mPa·s to 60,000 mPa·s measured at 20° C. with Brookfield viscosimeter.