Autoxidizable hair dye containing preparations
AssigneeClairol Incorporated
InventorsRaymond Feinland, Sigmund Iscowitz, Milos S. Bil
Life of this patent
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Abstract
An autoxidizable hair preparation capable of coloring hair when applied thereto and exposed to the atmosphere comprising N,N-bis(2-hydroxyethyl)-p-phenylenediamine or an acid addition salt thereof and a triol selected from the group consisting of 1,2,4-benzenetriol and 2,4,5-trihydroxytoluene. The preparation is applied at multiple spaced intervals of time until the desired color build-up is attained. Also prepares the composition by preforming a solution of the triol by storing the corresponding triacetate in acid solution for a period of time then adding the N,N-bis(2-hydroxyethyl)-p-phenylenediamine.
Claims6
In a process for preparing a hair dye composition comprising a solution of a tinctorially effective amount of N,N-bis(2-hydroxyethyl)-p-phenylenediamine or an acid addition salt thereof and a tinctorially effective amount of a triol selected from the group consisting of 1,2,4-benzenetriol and 2,4,5-trihydroxytoluene the improvement which comprises preforming a solution containing a tinctorially effective amount of the triol by storing a triacetate of said triol at a temperature between about room temperature and 50.degree. C for about 12 to 24 hours with ethanol in dilute sulfuric acid and then incorporating in said preformed solution water and a composition containing a tinctorially effective amount of said N,N-bis(2-hydroxyethyl)-p-phenylenediamine or an acid addition salt thereof.
In a process for preparing a hair dye composition comprising a solution of a tinctorially effective amount of:
- a. a p-phenylenediamine of the formula ##STR3## or an acid addition salt thereof;
- where R is hydrogen, 2-hydroxyethyl, 2-hydroxypropyl, 3-hydroxypropyl, or 2,3-dihydroxypropyl and where R.sup.1 and R.sup.2, which may be the same or different, are hydrogen or methyl;
- and
- b. a tinctorially effective amount of a triol selected from the group 1,2,4-benzenetriol and 2,4,5-trihydroxytoluene;
- the improvement which comprises preforming a solution containing a tinctorially effective amount of the triol by storing the triacetate of said triol at a temperature between about room temperature and 50.degree. C for about 12 to 72 hours with a lower aliphatic alcohol having from 1 to 3 carbon atoms and a concentrated inorganic mineral acid selected from the group consisting of sulfuric and hydrochloric, and then incorporating in said preformed solution water and a composition containing a tinctorially effective or an acid addition salt thereof.
Dependencies are inferred from the claim text.