Patent ID: 6045590
Filing Date: 2000-04-04
Classification: A61K,A61Q

Abstract:
A method for reducing undesired by-product formation in a hair dye composition containing a primary intermediate, 2-methyl-1-naphthol as a coupling agent and an alkalizing agent, said composition being reactive with an oxidant to produce an oxidative dye which when applied to a keratin fiber in an amount and for a time sufficient will dye same, said method comprising substituting for the 2-methyl-1-naphthol in said composition, a molar equivalent of a compound of formula II ##STR13## wherein R.sub.3 is --COOCH.sub.3, --COCH.sub.3, or --COCH.sub.2 CH.sub.3 and R.sub.4 is hydrogen; or R.sub.3 is hydrogen and R.sub.4 is --OCH.sub.3, --OCH.sub.2 CH.sub.3, --OCH.sub.2 CH.sub.2 OH, or --OCH.sub.2 CH.sub.2 OCH.sub.3.