WERKWIJZE VOOR HET OPTISCH BLEKEN VAN NATUURLIJKE OF SYNTHETISCHE VEZELS OF VEZELVORMENDE POLYMEREN, DE ALDUS VERKREGEN OPTISCH GEBLEEKTE NATUURLIJKE OF SYNTHETISCHE VEZELS OF VEZELVORMENDE POLYMEREN EN WERKWIJZE VOOR HET BEREIDEN VAN TRIAZOLYLVINYLEENFENYLEENVERBINDINGEN GESCHIKT VOOR GEBRUIK BIJ DE HIERVOOR BESCHREVEN WERKWIJZE.

摘要

The invention provides novel compounds of formula IN WHICH R signifies a substituted or unsubstituted mono- or bi-nuclear aryl radical, or a radical of formula II, R1 and R3, which may be the same or different, each signifies a substituted or unsubstituted alkyl radical of 1 to 6 carbon atoms or mono- or bi-nuclear aryl radical, R2 and R4, which may be the same or different, each signifies a hydrogen or chlorine atom, a substituted or unsubstituted alkyl radical of 1 to 6 carbon atoms, or a group -CN, -CONH2, -COOR5, in which R5 signifies a hydrogen atom or an unsubstituted or substituted alkyl radical of 1 to 6 carbon atoms, or -NH-CO-R6, in which R6 signifies a substituted or unsubstituted alkyl radical of 1 to 6 carbon atoms, N SIGNIFIES 1 TO 6, AND THE RING(S) B may be unsubstituted or substituted, PROVIDED THAT N SIGNIFIES OTHER THAN 1, WHEN R signifies a radical of formula II stated above useful as optical brighteners.