Process for pigmenting wood

A process for pigmenting wood, which comprises treating wood in succession:

• a) with a solution comprising
• from 0.01 to 80% by weight, based on the solution, of a compound of the formula
• A(B)x (I),
• in which x is an integer from 1 to 8,
• A is the radical of a chromophore of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, indanthrone, isoindolinone, isoindoline, dioxazine, azo, phthalocyanine or diketopyrrolopyrrole series which is attached to x groups B via one or more heteroatoms, these heteroatoms being selected from the group consisting of N, O and S and forming part of the radical A,
• B is hydrogen or a group of the formula
• at least one group B not being hydrogen and, if x is a number from 2 to 8, the groups B being identical or different, and
• L is a group of the formula
• in which R1, R2 and R3 independently of one another are C1-C6alkyl, R4 and R8 independently of one another are C1-C6alkyl, C1-C6alkyl interrupted by O, S or N(R12)2, or unsubstituted or C1-C6alkyl-, C1-C6alkoxy-, halogen-, cyano- or nitro-substituted phenyl or biphenyl, R5, R6 and R7 independently of one another are hydrogen or C1-C6alkyl,
• R9 is hydrogen, C1-C6alkyl or a group of the formula
• R10 and R11 independently of one another are hydrogen, C1-C6alkyl, C1-C6alkoxy, halogen, cyano, nitro, N(R12)2 or unsubstituted or halogen-, cyano-, nitro-, C1-C6alkyl- or C1-C6alkoxy-substituted phenyl,
• R12 and R13 are C1-C6alkyl, R14 is hydrogen or C1-C6alkyl and R16 is hydrogen, C1-C6alkyl, unsubstituted or C1-C6alkyl-substituted phenyl,
• Q is p,q-C2-C6alkylene which is unsubstituted or substituted one or more times by C1-C6alkoxy, C1-C6alkythio or C2-C12dialkylamino, p and q being different locants,
• X is a heteroatom selected from the group consisting of N, O and S, m being 0 if x is O or S and 1 if x is N, and
• L1 and L2 independently of one another are [-(p′,q′-C2-C6alkylene)-Z-]n—C1-C6alkyl or C1-C6alkyl which is unsubstituted or substituted one or more times by C1-C12alkoxy, C1-C12alkylthio, C1-C24dialkylamino, C6-C12aryloxy, C6-C12arylthio, C7-C24alkylarylamino or C12-C24diarylamino, n being a number from 1 to 1000, p′ and q′ being different locants, each Z independenty of the others being a heteroatom O, S or C1-C12alkyl-substituted N, and C2-C6alkylene in the repeating units [—C2-C6alkylene-Z-] being identical or different,
• and L1 and L2 may be saturated or unsaturated 1 to 10 times, uninterrupted or interrupted at any desired points by from 1 to 10 groups selected from the group consisting of —(C═O)— and —C6H4—, and
• L1 and L2 may carry none or from 1 to 10 further substituents selected from the group consisting of halogen, cyano and nitro;
• and
• from 0.05 to 5% by weight, based on the solution, of a salt of the formula
• Kat+.An− (II),
• Kat+.½An2− (III)
• or
• Kat+.⅓An3− (IV),
• in which Kat+ is lithium, sodium, potassium or ammonium, An− is formate, acetate, propionate or hydrogen carbonate, An2− is oxalate, maleate, fumarate, malonate, carbonate or hydrogen phosphate, and An3− is citrate or phosphate,
• in water or an organic solvent or in a single-phase mixture thereof,
• b) with a solution comprising from 0.01 to 50% by weight, based on the solution, of an organic C1-C6carboxylic acid in water or an organic solvent or in a single-phase mixture thereof, and
• c) converting the compound of the formula (I) thermally to a pigment of the formula.