Patent ID: 7294287

Claim:
A fluorescent whitening agent of formula (I) or (II) wherein X and Y, independently of each other are C 1-12 straight or branched chain alkyl, C 3-6 cycloalkyl, C 6-10 aromatic, C 3-9 saturated or unsaturated heterocycle, C 7-12 aralkyl, halogen, —OR, CF 3 , —COOR, —CONR′R, NO 2 , NR′R, SO 3 H, SO 2 NR′R or C 2-8 alkylcarbonyl, R and R′, independently of each other are hydrogen, C 1-8 straight or branched chain alkyl, C 3-6 cycloalkyl, C 6-10 aromatic, C 7-12 aralkyl or C 2-8 alkylcarbonyl, and m and n are independently 0, 1, 2, 3 or 4, when m or n is 2, 3 or 4, each X or Y substituent may be a different group as defined above with the proviso that m and n are not simultaneously 0.