Fillers dyed with polycationic dyestuffs useful for coloring paper and non-woven fabrics
AssigneeSandoz Ltd.
InventorsJuerg Troesch, Walter Portmann
Life of this patent
Estimating the term…
Abstract
Coloring compositions comprising an aqueous paste or dispersion of a filler which has been dyed with a water-soluble polycationic dyestuff, preferably together with a binding agent, are used in the coating of paper and the fixing, dyeing and printing of non-woven fabrics, including tissue paper.
Claims28
A colored composition comprising an aqueous paste or dispersion of a filler for paper or for nonwoven fabric, which filler has been dyed with at least one water-soluble polycationic dyestuff which is substantive to the filler and contains, per molecule, at least 1.3 cationic groups, said cationic groups being quaternary or protonated nitrogen atoms and being present in a total number which is at least one more than the total number of anionic groups which may be present, with the proviso that where the dyestuff is a 1:2 metal complex containing two dyestuff units per metal atom, each dyestuff unit contains at least 1.3 cationic groups, said composition containing no significant quantity of dyestuff which is not fixed on the filler.
A composition comprising a filler selected from kaolin, calcium carbonate, talc, permanent white and titanium dioxide, said filler having been dyed with at least one water-soluble polycationic dyestuff which is substantive to the filler and contains, per molecule, at least 1.3 cationic groups, said cationic groups being quaternary or protonated nitrogen atoms and being present in a total number which is at least one more than the total number of anionic groups which may be present, with the proviso that where the dyestuff is a 1:2 metal complex containing two dyestuff units per metal atom, each dyestuff unit contains at least 1.3 cationic groups, said composition containing no significant quantity of dyestuff which is not fixed on the filler.
A composition consisting of white pigment having fixed thereon at least one polycationic dyestuff which is substantive to the filler and contains, per molecule, at least 1.3 cationic groups, said cationic groups being quaternary or protonated nitrogen atoms and being present in a total number which is at least one more than the total number of anionic groups which may be present, with the proviso that where the dyestuff is a 1:2 metal complex containing two dyestuff units per metal atom, each dyestuff unit contains at least 1.3 cationic groups.
Dependencies are inferred from the claim text.