Hydroxyl derivatives of benzaldehyde for coloring keratin fibres in the absence of oxidizing agent

Claim 2

Process for colouring keratin fibres in the absence of an oxidising agent, which comprises applying thereto at least one composition containing a cosmetically acceptable medium and a dyestuff corresponding to the formula: ##STR7## in which R denotes a linear or branched lower alkyl group which is optionally substituted by one or two hydroxyl groups, n is equal to 1, 2 or 3, m is equal to 0, 1 or 2 such that n+m is equal to 2 or 3, with the proviso that (i) if m is equal to 0 (and n is equal to 2 or 3), the OH groups occupy the following positions of the ring: ______________________________________ 2 3 4 5 6 ______________________________________ OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH ______________________________________ and (ii) if m and n both denote 1, the substituents occupy the following positions of the rings: ______________________________________ 2 3 4 5 6 ______________________________________ OH OR OR OH OH OR OH OR OH OR OH OCH.sub.2 CH.sub.2 OH (3) OH ##STR8## OH OC.sub.2 H.sub.5 ______________________________________ or a bisulphite adduct thereof.

Claim 3

Process according to claim 1 in which the dyestuff corresponds to formula (I) as defined in claim 1 in which the substituents and the position thereof are as specified in the following table: ______________________________________ Com- pound No. 2 3 4 5 6 ______________________________________ 1 OH OH 2 OH OH 3 OH OH 4 OH OH 5 OH OH OH 6 OH OH OH 7 OH OH OH 8 OH OH OH 9 OH OH OH 10 OH OCH.sub.3 11 OCH.sub.3 OH 12 OH OCH.sub.3 13 OH OCH.sub.3 14 OH OC.sub.2 H.sub.5 15 OH OC.sub.2 H.sub.5 16 OH OH OCH.sub.3 17 OH OH OCH.sub.3 18 OH OH OCH.sub.3 19 OH OCH.sub.3 OH 20 OH OH OCH.sub.3 21 OH OCH.sub.3 OH 22 OH OCH.sub.3 OH 23 OH OH OCH.sub.3 24 OH OCH.sub.3 OH 25 OH OH OCH.sub.3 26 OH OH OCH.sub.3 27 OH OCH.sub.3 OH 28 OCH.sub.3 OH OH 29 OH OH OCH.sub.3 30 OCH.sub. 3 OH OH 31 OH OCH.sub.3 OH 32 OH OC.sub.2 H.sub.5 OH 33 OH OH OC.sub.2 H.sub.5 34 OH OCH.sub.3 OCH.sub.3 35 OCH.sub.3 OH OCH.sub.3 36 OH OCH.sub.3 OCH.sub.3 37 OCH.sub.3 OH OCH.sub.3 38 OH OCH.sub.3 OCH.sub.3 39 OH OCH.sub.3 OCH.sub.3 40 OH OCH.sub.3 OCH.sub.3 41 OH OCH.sub.3 OCH.sub.3 42 OCH.sub.3 OH OCH.sub.3 43 OCH.sub.3 OH OCH.sub.3 44 OH OCH.sub.3 OCH.sub.3 45 OH OCH.sub.3 OCH.sub.3 46 OCH.sub.3 OCH.sub.3 OH 47 OCH.sub.3 OH OCH.sub.3 48 OCH.sub.3 OH OCH.sub.3 49 OH OCH.sub.2 CH.sub.2 OH 50 OH ##STR9## ______________________________________

Claim 4

Process according to claim 1 in which n+m is equal to 3.

Claim 5

Process according to claim 1 in which m is 0 and n is 2, the two OH groups being in the 2,6- or 3,5-positions.

Claim 6

Process according to claim 1 in which the dyestuff is applied in an acid medium.

Claim 7

Process according to claim 5, in which the dyestuff of formula (I) is one in which the substituents and the position thereof are as specified in the following table: ______________________________________ 2 3 4 5 6 ______________________________________ OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OCH.sub.3 OH OH OCH.sub.3 OH OH OCH.sub.3 OH OCH.sub.3 OH OH OH OCH.sub.3 OH OCH.sub.3 OH OH OCH.sub.3 OH OH OH OCH.sub.3 OH OCH.sub.3 OH OH OH OCH.sub.3 ______________________________________

Claim 8

Process according to claim 1, in which the dyestuff is applied in an alkaline medium.

Claim 9

Process according to claim 7, in which the dyestuff of formula (I) is one in which the substituents and the position thereof are as specified in the following table: ______________________________________ 2 3 4 5 6 ______________________________________ OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OCH.sub.3 OCH.sub.3 OCH.sub.3 OH OCH.sub.3 OH OCH.sub.3 OCH.sub.3 OCH.sub.3 OH OCH.sub.3 ______________________________________

Claim 10

Process according to claim 1, in which the dyestuff is applied in the form of a poultice with one or more powdered solids, and after the fibres have been impregnated, they are rinsed and dried.

Claim 11

A composition suitable for dyeing keratin fibres, which contains, in a diluent or carrier, at least one dyestuff corresponding to the formula defined in claims 1 or 2.

Claim 12

A composition according to claim 10, in which the dyestuff is one in which n+m is equal to 3.

Claim 13

A composition according to claim 11, in which the dyestuff is one in which m is 0 and n is 2, the two OH groups being in the 2,6- or 3,5-positions.

Claim 14

A composition according to claim 10, in which the dyestuff is 2,4-dihydroxybenzaldehyde, 3,4-dihydroxybenzaldehyde, 3-hydroxy-4-methoxybenzaldehyde or 4-hydroxy-3,5-dimethoxybenzaldehyde.

Claim 15

A composition according to claim 10 which is in the form of a poultice powder comprising a clay, silica, flour, starchy or mucilaginous substance and a powdered plant.

Claim 16

A composition according to claim 10 which contains one or more direct dyestuffs and/or other natural dyestuffs.

Claim 17

A composition according to claim 10 in which the diluent is aqueous and contains one or more surface-active agents, organic solvents, thickeners, antioxidants, penetrating agents, sequestering agents, film-forming polymers, buffers, alkalising or acidifying agents or perfumes.

Claim 18

A composition according to claim 10 in which the dyestuff of formula I is present in an amount from 0.05 to 10% by weight.