Fillers dyed with polycationic dyestuffs useful for coloring paper and non-woven fabrics

Claim 2

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.

Claim 3

A composition according to claim 1 in which the filler is kaolin, calcium carbonate or talc.

Claim 4

A composition according to claim 1 in which the dyestuff is biscationic.

Claim 5

A composition according to claim 1 in which the dyestuff is a 1:1 or 1:2 metal complex azo dye.

Claim 6

A composition according to claim 1 in which the dyestuff, as the metal-free cation, has a molecular weight of at least 400.

Claim 7

A composition according to claim 1 in which the dyestuff is a phthalocyanine dyestuff containing 2 or more cationic groups which are attached to the periphery of the phthalocyanine ring system.

Claim 8

A composition according to claim 1 in which the dyestuff has a substantially linear structure comprising three or more homo- or heteroaromatic rings or fused ring systems joined directly or by bridging groups in such a way that there are two terminal rings or ring systems and one or more medial ring or ring systems, there being on average at least 1.3 cationic groups per molecule attached to terminal rings or ring systems, and none elsewhere.

Claim 9

A composition according to claim 7 in which the dyestuff has one cationic group on each terminal ring or ring system and none elsewhere.

Claim 10

A composition according to claim 2 wherein the dyestuff is a metal complex of a biscationic dye and has a molecular weight of at least 400 as the metal-free cation.

Claim 11

A composition according to claim 1 containing a binding agent.

Claim 12

A composition according to claim 10 in which the binding agent is present in the amount of from 2% to 20% wt. of the total composition.

Claim 13

A composition according to claim 1 containing 0.1-10% by weight of filler of a dispersing agent.

Claim 14

A composition according to claim 12 in which the dispersing agent is a condensation product of β-naphthalene sulphonic acid with formaldehyde, containing units of structure ##STR5##

Claim 15

A composition according to claim 1 wherein the filler is a member selected from the group consisting of urea-formaldehyde condensation products, silicates, sulphates, carbonates, oxides, hydroxides, sulphides and sulphites.

Claim 16

A composition according to claim 3 wherein the filler is an inorganic filler selected from the group consisting of kaolin, talc, diatomite, French chalk, asbestine, calcium silicate, quartz sand, asbestos, gypsum, annaline, lenzine, calcium sulphoaluminate, barium sulphate, calcium carbonate, magnesite, whiterite, white lead, dolomite, calamine, alumina, bayrites, titanium dioxide, slaked lime, burned magnesia, zinc white, lithopone, zinc sulphide and calcium sulphite.

Claim 17

A composition according to claim 15 wherein the molecular weight of the metal-free cation portion of the dyestuff is 500 to 1000.

Claim 18

A composition according to claim 15 in which the dyestuff has a substantially linear structure comprising three or more homo- or hetero-aromatic rings or fused ring systems joined directly or by bridging groups in such a way that there are two terminal rings or ring systems and one or more medial rings or ring systems, there being one cationic group attached to each terminal rings or ring systems, and none elsewhere.

Claim 19

A composition according to claim 17 wherein the molecular weight of the metal-free cation portion of the dyestuff is 500 to 1000.

Claim 20

A composition according to claim 15 wherein the filler is selected from the group consisting of kaolin, calcium carbonate, talc, permanent white and titanium dioxide.

Claim 21

A composition according to claim 19 containing 0.1 to 10%, by weight of filler, of a dispersing agent.

Claim 22

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.

Claim 23

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.

Claim 24

A composition according to claim 21 wherein the polycationic dyestuff is water-soluble and has a molecular weight of 500 to 1000 in its metal-free cation portion.

Claim 25

A composition according to claim 1 wherein the molecular weight of the metal-free cation portion of the polycationic dyestuff is 500 to 1000.

Claim 26

A composition according to claim 1 wherein the filler has been dyed with a combination of polycationic dyestuffs as defined therein.

Claim 27

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.

Claim 28

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.

Claim 29

A composition according to claim 25 wherein the metal-free cation portion of the polycationic dyestuff(s) is 500 to 1000.

Claim 30

A composition according to claim 25 wherein the pigment is selected from the group consisting of kaolin, calcium carbonate, talc, permanent white and titanium dioxide.

Claim 31

A composition according to claim 27 wherein the dyestuff is a metal complex of a biscationic dye and has a molecular weight of at least 400 as the metal-free cation.