Dying composition comprising a particular disulfide dye and dying method thereof
A disulfide, dyeing method technology, applied in the field of hair dyeing and human keratin fibers, can solve the problems of color discoloration and the like
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0293]
[0294] A solution consisting of 500 mg cystamine dihydrochloride (2.22 mmol) and 20 ml 0.05M borate buffer (pH 9) was prepared, the buffer adjusted to pH 9 by addition of molar sodium hydroxide. To this solution was added 4.6 grams of reactive blue 44 [Cas 12225-56-8] (60% purity, ie 4.44 mmol). The mixture was stirred at room temperature for 18 hours, and the precipitated dye was filtered and dried. 1.67 g of blue dye (I) were recovered.
Embodiment 2
[0296]
[0297] A solution consisting of 500 mg cystamine dihydrochloride (2.22 mmol) and 20 ml 0.05M borate buffer (pH 9) was prepared, the buffer adjusted to pH 9 by addition of molar sodium hydroxide. To this solution was added 6.23 grams of Active Orange 64 [Cas 61901-80-2] (purity 50%, ie 4.44 mmol). The mixture was stirred at room temperature for 18 hours, and the precipitated dye was filtered and dried. 2.03 g of orange dye (II) were recovered.
Embodiment 3
[0299]
[0300] Basic cystamine (552.2 mg; 3.62 mmol) obtained by addition of sodium hydroxide and extraction with ethyl acetate was dissolved in 2 ml of pentanol using cystamine dihydrochloride. Add a suspension of 2-[(4-methoxyphenyl)diazinyl]-1,3-dimethyl 1H-imidazol-3-ium chloride (2.42 mg; 9.1 mmol) in 80 ml of dichloromethane liquid. The mixture was warmed to 50°C and kept stirring for 1 hour. Concentration in vacuo (removal of dichloromethane) was carried out, 20 ml of water were added and the reaction mixture was maintained at 50° C. for a further hour. The mixture was then cooled and poured into 50 ml of pentanol; a red precipitate appeared, which was filtered, washed with acetone, and dried in vacuo. This gave 1.1 g of a dark red powder having the above structure.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More