Patent ID: 7125445

Claim:
A red colorant composition with good pH value stability, comprising: at least one reactive red colorant; and at least one azo red dye having formula (I): wherein R 1 is hydrogen or an aliphatic radical having from 1 to 6 carbon atoms; n is 2, 3, or 4; X is NR 3 R 4 wherein R 3 and R 4 are independently hydrogen, aralkyl, unsubstituted aryl or an aryl substituted by COOM or SO 3 M; or R 3 and R 4 form a ring with or without inclusion of a hetero atom; or X is SR 5 in which R 5 is alkyl from 1 to 6 carbon atoms, C2 to C6 substituted alkyl where the substituents are OH, OCH 3 , COOM, or SO 3 M; or X is OR 6 in which R 6 is hydrogen or an aliphatic radical having from 1 to 6 carbon atoms; R 7 is hydrogen, alkyl of 1 to 6 carbon atoms, C2 to C6 substituted alkyl where the substituents are CN, COOM, OH, COOCH 3 , COOCH 2 CH 3 ; unsubstituted aryl or aryl substituted by CH 3 or halogen; and M is hydrogen, a metal atom, an ammonium or ammonium substituted with alkyl, alkoxyalkyl and hydroxyalkyl each having 1 to 12 carbon atoms.