Patent ID: 6709468
Filing Date: 2004-03-23
Classification: A61K,A61Q

Abstract:
A method for permanently dyeing hair which comprises subjecting said hair to a number of treatments, having a set time interval between each two consecutive such treatments, wherein each treatment comprises steps a.) and b.) below:a.) contacting said hair, for a period of about 5 seconds to about 5 minutes with a mixture prepared within a few seconds or minutes of said contacting step, the mixture comprising: i) part ai: dye intermediates in water at alkaline pH with a quaternary ammonium compound formed with one guaternary nitrogen atom having two aliphatic chains each containing about 12 to about 18 carbons and having two identical or different short chain alkyl groups of one or two carbons, each bonded to the quaternary nitrogen atom; and ii) part aii: oxidizing compound in water at acidic pH b.) rinsing said mixture from said hair with water: and wherein said number of treatments is between about 2 to about 30; and wherein said set time interval between each two consecutive treatments is between about 8 hours and 30 days.