Patent number: 6645257
Abstract: 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 any desired group suitable for solubilization; and
from 0.05 to 5% by weight, based on the solution, of a salt of the formula
Kat+.An− (II),
Kat+.
Type:
Grant
Filed:
September 15, 2000
Date of Patent:
November 11, 2003
Assignee:
Ciba Specialty Chemicals Corporation
Inventors:
Hans-Thomas Schacht, Gilbert Moegle, Reiner Jahn, Christiane Griessen, Peter Scheibli