MIXTURE OF OPTICAL BRIGHTENERS

摘要

Optical brighteners are prepared from 0.98-0.50 parts of a mixture prepared from 0.05-0.95 parts of compd. (I) and 0.95-0.05 parts of compd.(II), and 0.02-0.50 parts of compd. (III), where R1 = H or C1-C4 alkyl; R2 = H or C1-C4 alkyl in 6- or 7-position; A = -CN, - COOH, -COOCH3, -C6H5, or a nitrogen ring compd. containing R4 gp.; R4 = C1-C4 alkyl or β-hydroxy ethyl; and R3 = H or C1-C4 alkyl.