Abstract: The instant invention relates to liquid sizing compositions comprising shading dyestfuffs, derivatives of diaminostilbene, binders, protective polymers, and optionally divalent metal salts which can be used for the optical brightening of substrates, including substrates suitable for high quality ink jet printing.

Abstract: Aqueous coating composition for shading substrates, preferably paper, comprising (a) at least one shading dye of formula (I) in which R1 signifies H, methyl or ethyl, R2 signifies paramethoxyphenyl, methyl or ethyl, M signifies a cation selected from the group consisting of hydrogen, an alkali metal cation, alkaline earth metal, ammonium, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched alkyl radical, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched hydroxyalkyl radical, ammonium which is, di-, tri- or tetrasubstituted by a mixture of C1-C4 linear or branched alkylradical and linear or branched hydroxyalkyl radical or mixtures of said compounds, (b) at least one white pigment, (c) at least one primary binder, (d) optionally one or more secondary binders and (e) water.

Abstract: Aqueous coating composition for optical brightening and shading of substrates comprising (a) at least one optical brightener of formula (I) in which the anionic charge on the brightener is balanced by a cationic charge composed of one or more identical or different cations selected from the group consisting of hydrogen, an alkali metal cation, alkaline earth metal, ammonium, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched alkyl radical, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched hydroxyalkyl radical, ammonium which is, di-, tri- or tetrasubstituted by a mixture of C1-C4 linear or branched alkylradical and linear or branched hydroxyalkyl radical or mixtures of said compounds, R1 and R1? may be the same or different, and each is hydrogen, C1-C4 linear or branched alkyl, C2-C4 linear or branched hydroxyalkyl, CH2CO2?, CH2CH2CONH2 or CH2CH2CN, R2 and R2? may be the same or different, and each is C1-C4 linear or branched alkyl, C2-C4

Abstract: Aqueous coating composition for optical brightening and shading of substrates comprising (a) at least one optical brightener of formula (I) in which the anionic charge on the brightener is balanced by a cationic charge composed of one or more identical or different cations selected from the group consisting of hydrogen, an alkali metal cation, alkaline earth metal, ammonium, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched alkyl radical, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched hydroxyalkyl radical, ammonium which is, di-, tri- or tetrasubstituted by a mixture of C1-C4 linear or branched alkylradical and linear or branched hydroxyalkyl radical or mixtures of said compounds, R1 and R1? may be the same or different, and each is hydrogen, C1-C4 linear or branched alkyl, C2-C4 linear or branched hydroxyalkyl, CH2CO2?, CH2CH2CONH2 or CH2CH2CN, R2 and R2? may be the same or different, and each is C1-C4 linear or branched alkyl, C2-C4

Abstract: Aqueous coating composition for shading substrates, preferably paper, comprising (a) at least one shading dye of formula (I) in which R1 signifies H, methyl or ethyl, R2 signifies paramethoxyphenyl, methyl or ethyl, M signifies a cation selected from the group consisting of hydrogen, an alkali metal cation, alkaline earth metal, ammonium, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched alkyl radical, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched hydroxyalkyl radical, ammonium which is, di-, tri- or tetrasubstituted by a mixture of C1-C4 linear or branched alkylradical and linear or branched hydroxyalkyl radical or mixtures of said compounds, (b) at least one white pigment, (c) at least one primary binder, (d) optionally one or more secondary binders and (e) water.

Abstract: Object of the invention is the method for preparing white paper which comprises adding to the pulp mass an aqueous formulation comprising a) at least one optical brightener of formula (I) in which the anionic charge on the brightener is balanced by a cationic charge composed of one or more identical or different cations selected from the group consisting of hydrogen, an alkali metal cation, alkaline earth metal, ammonium, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched alkyl radical, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched hydroxyalkyl radical, ammonium which is, di-, tri- or tetrasubstituted by a mixture of C1-C4 linear or branched alkylradical and linear or branched hydroxyalkyl radical or mixtures of said compounds, wherein R1 and R1? may be the same or different, and each is hydrogen, C1-C4 linear or branched alkyl, C2-C4 linear or branched hydroxyalkyl, CH2CO2?, CH2CH2CONH2 or CH2CH2CN, R2 and R2? may be the same o

Abstract: The instant invention relates to liquid sizing compositions comprising shading dyestfuffs, derivatives of diaminostilbene, binders, protective polymers, and optionally divalent metal salts which can be used for the optical brightening of substrates, including substrates suitable for high quality ink jet printing.

Abstract: The instant invention relates to liquid sizing compositions comprising shading dyestuffs, derivatives of diaminostibene, binders, protective polymers, and optionally divalent metal salts which can be used for the optical brightening of substrates, including substrates suitable for high quality ink jet printing.