The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1989
Filed:
Jan. 03, 1983
Christian Monnais, Neuilly-sur-Seine, FR;
Jean Cotteret, Franconville, FR;
L'Oreal, Paris, FR;
Abstract
The invention relates to oxidation dyeing compositions comprising oxidation dyestuff precursors and N-substituted ortho-nitroanilines of the formula: ##STR1## in which R.sub.1 denotes an alkyl, monohydroxyalkyl or polyhydroxyalkyl group, R.sub.2 denotes hydrogen or an amino, monoalkylamino, dialkylamino, mono- or di-(monohydroxyalkyl or polyhydroxyalkyl)-amino, (N-alkyl-N-monohydroxyalkyl or N-alkyl-N-polyhydroxyalkyl)-amino, alkoxy, monohydroxyalkoxy, polyhydroxyalkoxy or aminoalkoxy group and R.sub.3 denotes hydrogen or an alkyl group, at least one of R.sub.2 and R.sub.3 being different from H, with the proviso that if R.sub.1 denotes --CH.sub.2 CH.sub.2 OH, R.sub.2 cannot be di-(monohydroxyalkyl)-amino in an alkaline medium which is non-ammoniacal and comprises an alkali metal or ammonium bisulphite and at least one alkanolamine which is N-(C.sub.1 to C.sub.4 -alkyl-ethanolamine, N,N-di(C.sub.1 to C.sub.4 -alkyl)-ethanolamine, di-(hydroxy-C.sub.2 to C.sub.3 -alkyl)-amine, 2-amino-2-methylpropan-1-ol, 2-dimethylamino-2-methylpropan-1-ol, 2-amino-2-ethylpropane-1,3-diol, 2-amino-2-methylpropane-1,3-diol or 2-amino-2-hydroxymethylpropane-1,3-diol.