Patent ID: 6627742
Filing Date: 2003-09-30
Classification: C09B

Abstract:
A hydroxypyridonemethide azo dye conforming to the formula (I) and its tautomeric forms whereX1is H, Cl, Br, â€”CN, â€”CH&boxH;O, â€”COâ€”T, â€”CO2â€”R2, â€”SO2â€”T, or â€”NO2, X2, X3 and X4 are independently H, Cl or Br, R1 is H, T, or â€”CF3, and R2 is straight-chain or branched C1-C4-alkyl, where T is straight-chain or branched C1-C10-alkyl which may be interrupted by 1 or 2 oxygen atoms in ether function and/or substituted by one or more phenyl or hydroxyl radicals, or is phenyl which may be substituted by 1 to 2 radicals selected from the group consisting of Cl, Br and C1-C2-alkyl.