Claims
- 1. 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.
- 2. A process according to claim 1 including the step of adjusting with a suitable alkali the pH of the composition formed by mixing said preformed solution of said triol and said N,N-bis (2-hydroxyethyl)-p-phenylenediamine or acid addition salt thereof.
- 3. 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.
- 4. A process according to claim 3 in which said p-phenylenediamine is selected from the group consisting of p-phenylenediamine; 2,5-diaminotoluene, N,N-bis(2-hydroxyethyl)-p-phenylenediamine; 2,6-dimethyl-p-phenylenediamine; and N.sup.4,N.sup.4 -bis(2-hydroxyethyl)-2-methyl-p-phenylenediamine.
- 5. A process according to claim 3 including the step of adjusting the pH of the composition formed by mixing said preformed solution of said triol with said p-phenylenediamine or acid addition salt with a suitable alkali.
- 6. A process according to claim 3 in which from about 1 to 60 parts of said triacetate and from 0.5 to 2.0 parts of said concentrated acid are employed per 100 parts of said alcohol.
RELATED CASES
This application is a continuation-in-part of application Ser. No. 489,317, filed July 17, 1974, now U.S. Pat. No. 3,920,384.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
12,902 OF |
Jan 1900 |
UK |
Non-Patent Literature Citations (2)
Entry |
Noller, Chemistry of Organic Compounds, W. B. Saunders Company, Philadelphia (1957), pp. 167-171. |
Chemical Abstracts, vol. 74, 12300p. (1971). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
489317 |
Jul 1974 |
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