JP2008523167A5 - - Google Patents

Claims (19)

(A) synthetic amorphous silica or aluminosilicate pigment particles;
(B) at least one water-soluble aluminum salt;
(C) at least one cationic polymer having a molecular weight of 2000 to 1000000 and a charge density of 0.2 to 12 meq / g, wherein the synthetic amorphous silica or aluminosilicate particles are silica, aluminosilicate or colloidal primary particles in the aqueous sol of these mixtures, is selected from the group consisting of mixtures of one or more of 及 beauty above types of particles, the amount of the cationic polymer based on the amount of dry pigment particles 0. A pigment composition in the form of an aqueous dispersion in an amount of 1% to 15% by weight.   The composition according to claim 1, wherein the total content of the synthetic amorphous silica or aluminosilicate pigment particles and any other pigment particles in the composition is 10 wt% to 60 wt%.   The composition according to claim 1, wherein the synthetic amorphous silica or aluminosilicate pigment particles have an average diameter of 0.005 μm to 25 μm.   The composition according to any one of claims 1 to 3, wherein the effective surface charge of the pigment particles in the composition is positive. The composition according to claim 1, wherein the synthetic amorphous silica or aluminosilicate pigment particles have a surface area of 30 to 600 m ² / g.   The synthetic amorphous silica or aluminosilicate pigment particles comprise colloidal particles in a sol prepared from alkali metal silicates by ion exchange or pH reduction and one or more precipitated silicas, gel-type silicas or fumed The composition according to any one of claims 1 to 5, which is a mixture with silica particles.   7. The at least one water-soluble aluminum salt is selected from the group consisting of aluminum chloride, polyaluminum chloride, polysulfuric acid aluminum silicate, aluminum sulfate, and mixtures thereof. Composition. Wherein the at least one water-soluble aluminum salt, calculated as% by weight of _Al 2 _{O 3} on dry pigment particles, present in an amount of 0.1 wt% to 30 wt%, any one of the preceding claims A composition according to item. Wherein the at least one water-soluble aluminum salt, dry pigment, calculated as% by weight of Al ₂ O ₃ with respect to the particles, present in an amount of 0.1 wt% to 15 wt%, The composition of claim 8.   10. The at least one cationic polymer is selected from the group consisting of PAM (polyacrylamide), polyDADMAC (polydiallyldimethylammonium chloride), polyallylamine, polyamine, polysaccharide, and mixtures thereof. The composition of any one of these.   11. A composition according to any one of the preceding claims, wherein the at least one cationic polymer is present in an amount of 0.5% to 15% by weight, based on the amount of dry pigment particles.   The composition according to claim 1, wherein the pigment composition further comprises other types of pigment particles.   13. The composition of claim 12, wherein the other type of pigment particles is selected from the group consisting of kaolinite, smectite, talcite, calcium carbonate mineral, precipitated calcium carbonate, and mixtures thereof. The synthetic amorphous silica or silicate particles, water-soluble aluminum salts, and cationic polymers having a molecular weight of 2000 to 1000000 and a charge density of 0.2 meq / g to 12 meq / g avoid gelation or precipitation were mixed in a way the method comprising the aqueous dispersion, the synthetic amorphous silica or particles of aluminosilicate, silica, aluminosilicate or a mixture thereof colloidal primary particles in the aqueous sol, 及 beauty of the 14. Selected from the group consisting of one or more mixtures of types of particles, wherein the amount of the cationic polymer is from 0.1% to 15% by weight based on the amount of dry pigment particles. The manufacturing method of the pigment composition as described in any one of these.   The pigment composition obtained by the method of Claim 14.   Use of a composition according to any one of claims 1 to 13 or 15 for coating a paper or paperboard web.   A method for producing coated paper or paperboard, comprising the step of applying a coating comprising the composition according to any one of claims 1 to 13 or 15 to at least one surface of the paper or paperboard web. The coating is covered surface per one of paper or board web, is applied in an amount sufficient to produce the pigment particles of 0.4g ^/ m ² ~40g / m 2 from the pigment composition, according to claim 17 the method of.   Paper or paperboard obtained by the method according to claim 17 or 18.