Bristol-Myers Squibb Compnay

Clairol Incorporated

Michael Y M Wong

Yuh-Guo Pan

Mu-Ill Lim

Gottfried Wenke

Linas R Stasaitis

Stanley Pohl

Dye compositions

Oxidative hair dyeing systems are provided that are &ldquo;root seeking&rdquo;, i.e., which produce more intense initial coloration on new growth, less porous hair compared to the initial coloration produced in older, damaged, more porous hair. More equalized coloration along the shaft of hair can be obtained with the &ldquo;root seeking&rdquo; dyeing products.

Oxidation hair dyeing systems and process for providing more equalized coloration on new and old growth hair

5-Nitroisatin is reacted with sodium hydroxide to produce an &agr;-keto acid sodium salt that is reduced with borane-tetrahydrofuran complex and then hydrogenated to produce 1-(2,5-diaminophenyl)ethylene glycol, a novel compound useful as a primary intermediate in the production of oxidative hair dyes.

Primary intermediate in oxidative hair dyeing

Growing community of inventors

Easton, CT, United States of America

Michael Y M Wong