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US 2013/0228192 A1Published application
Use of ascorbic acid derivatives for dyeing keratin-containing fibres
AssigneeMerck Patent GmbH
InventorsThomas Rudolph, Michaela Oberle
Life of this patent
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Abstract
The invention relates to the use of specific ascorbic acid derivatives for dyeing keratin-containing fibres or as direct dyes for the preparation of a composition for dyeing keratin-containing fibres, and to methods for dyeing keratin-containing fibres, in particular for dyeing human hair.
Claims14
A compound of the formula I or II
- where
- R1 or R2 each, independently of one another, denotes hydroxyl, —O-alkyl, —OC(O)-alkyl, —OPO3M or O-glycosyl,
- alkyl denotes a straight-chain or branched alkyl group having 1 to 10 C atoms,
- M denotes alkali or alkaline-earth metal cation or H,
- R3 or R4 each, independently of one another, stand for hydroxyl or for the formula III,
- where
- R5 to R9 each, independently of one another, denote H, —OH, straight-chain or branched alkoxy group having 1 to 20 C atoms, fluorinated straight-chain or branched alkoxy group having 1 to 20 C atoms, -A, —NH2, —NHA, —NA2, —NH—(CH2—CH2—O)n—H, —N[(CH2—CH2—O)n—H]2, —[NHA2]X, —[NA3]X, —SO3H, —[SO3]X, 2H-benzotriazol-2-yl or —OC(O)-alkyl,
- A denotes a straight-chain or branched alkyl group having 1 to 20 C atoms and
- X is the counterion to the cations [NHA2]+ and [NA3]+ or the anion [SO3]−, with the proviso that at least one of the radicals R3 or R4 conforms to the formula III, and salts thereof, useful
- for dyeing keratin-containing fibres.
7 more elements
A compound of the formula I or II
- where
- R1 or R2 each, independently of one another, denotes hydroxyl, —O-alkyl, —OC(O)-alkyl, —OPO3M or O-glycosyl,
- alkyl denotes a straight-chain or branched alkyl group having 1 to 10 C atoms,
- M denotes alkali or alkaline-earth metal cation or H,
- R3 or R4 each, independently of one another, stand for hydroxyl or for the formula III,
- where
- R5 to R9 each, independently of one another, denote H, —OH, straight-chain or branched alkoxy group having 1 to 20 C atoms, fluorinated straight-chain or branched alkoxy group having 1 to 20 C atoms, -A, —NH2, —NHA, —NA2, —NH—(CH2—CH2—O)n—H, —N[(CH2—CH2—O)n—H]2, —[NHA2]X, —[NA3]X, —SO3H, —[SO3]X, 2H-benzotriazol-2-yl or —OC(O)-alkyl,
- A denotes a straight-chain or branched alkyl group having 1 to 20 C atoms and
- X is the counterion to the cations [NHA2]+ and [NA3]+ or the anion [SO3]−, with the proviso that at least one of the radicals R3 or R4 conforms to the formula III, and salts thereof,
- as direct dye for the preparation of a composition for dyeing keratin-containing fibres.
7 more elements
Dependencies are inferred from the claim text.