Patent ID: 8354041
Filing Date: 2013-01-15
Classification: C07D,C09K,D21H

Abstract:
1. A composition suitable for surface treatment of paper, comprising: (a) at least one fluorescent whitening agent of the formula (I) wherein m and n represent, independently of each other, an integer from 0 to 3; R 1 , R 2 , R 3 , R 4 , R 5 and R 6 represent, independently of each other, hydrogen, cyano, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, C 1 -C 4 hydroxyalkyl, wherein the alkyl is linear or branched; or R 3 and R 4 or R 5 and R 6 independently of each other together with a N atom form a morpholine ring, a piperidine ring or a pyrrolidine ring; or —(CH 2 ) l —SO 3 M, wherein l is 1, 2 or 3; or wherein the —SO 3 M groups can be in o-, m-, or p-position and k is an integer from 1 to 3; or —(C 1 -C 4 alkylene)-COOR, —(C 1 -C 4 alkylene)-CONHR, —(C 1 -C 4 alkylene)-COR, wherein the alkylene is linear or branched, R is C 1 -C 3 alkyl or M; wherein M represents hydrogen, or one equivalent of a cation selected from the group consisting of Li, Na, K, Ca, Mg, and ammonium, wherein the ammonium is mono-, di-, tri- or tetra-substituted by C 1 -C 4 alkyl or C 2 -C 4 hydroxyalkyl; (b) at least one salt of a bivalent cation; (c) at least one carrier; and (d) water, wherein the composition comprises component (a) in an amount of 0.02 to 3 weight-%, component (b) in an amount of 0.2 to 8 weight-%, and component (c) in an amount of 3 to 20 weight-%, each based on 100 weight-% of the composition.