Patent ID: 6583273
Filing Date: 2003-06-24
Classification: C09B,Y10S

Abstract:
A dye of formula whereinR1 is hydrogen, halogen, C1-C8alkyl, â€”NHâ€”COâ€”C1-C4alkyl or phenyl, R2 is hydrogen, halogen, C1-C8alkyl, C1-C8alkoxy, â€”NHâ€”COâ€”C1-C4alkyl or phenyl, R3 is hydrogen, C1-C8alkyl or phenyl, R4 is hydrogen, halogen or C1-C8alkyl, and X is â€”COâ€”, â€”COOâ€” or â€”SO2â€”, and n is the number 1 or 2, orof formula whereinR1, R2, R3, R4 and X are as defined above and â€”NHâ€”Xâ€”R3 is bound in the para-position to the azo bridge.