Process for the production of filler-containing papers and filler-containing paper products by addition of an aqueous suspension of at least one finely divided polymer-pigment hybrid to a paper stock and drainage of the paper stock with sheet formation, the polymer-pigment hybrid being obtainable by
Process for the production of filler-containing papers and filler-containing paper products by addition of an aqueous suspension of at least one finely divided polymer-pigment hybrid to a paper stock and drainage of the paper stock with sheet formation, the polymer-pigment hybrid being obtainable by milling an aqueous suspension of at least one inorganic pigment in the presence of at least one binder and, if appropriate, by drying the aqueous suspension thus obtainable and redispersing the dried polymer-pigment hybrid in water, and the use of the polymer-pigment hybrids thus obtainable as a filler for the production of filler-containing paper or filler-containing paper products.
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1. A process for making a filler-containing paper or product thereof, comprising: dispersing at least one inorganic pigment and at least one polymer in water to obtain a first aqueous suspension;milling said first aqueous suspension in a ball mill to obtain a second aqueous suspension comprising a p
1. A process for making a filler-containing paper or product thereof, comprising: dispersing at least one inorganic pigment and at least one polymer in water to obtain a first aqueous suspension;milling said first aqueous suspension in a ball mill to obtain a second aqueous suspension comprising a polymer-pigment hybrid as a filler;optionally drying said second aqueous suspension to obtain a dried polymer-pigment hybrid;optionally redispersing the dried polymer-pigment hybrid in water;adding said second aqueous suspension or the dried polymer-pigment hybrid redispersed in water to a paper stock; anddraining the paper stock to obtain a sheet,wherein said at least one polymer is a polydiene consisting of from 10 to 90% by weight of an aliphatic hydrocarbon having two double bonds, from 10 to 90% by weight of a vinylaromatic compound, from 0 to 20% by weight of an acid monomer, and from 0 to 20% by weight of a further monomer, ora polyacrylate consisting of from 10 to 95% by weight of a C1-C10-alkyl (meth)acrylate, from 0 to 60% by weight of a vinylaromatic compound, from 0 to 20% by weight of an acid monomer, and from 0 to 10% by weight of a further monomer, andwherein the milling of said first aqueous suspension is carried out in the presence of a polyethylene wax, said wax comprising, in copolymerized form,from 26.1 to 39% by weight of at least one ethylenically unsaturated carboxylic acid, andfrom 61 to 73.9% by weight of ethylene. 2. The process according to claim 1, wherein said at least one inorganic pigment is selected from the group consisting of titanium dioxide, alumina, aluminum hydroxide, kaolin, talc, dolomite, clay, bentonite, satin white, calcium carbonate, calcium sulfate and barium sulfate, which is present in said second aqueous suspension and in an amount of from 1 to 80% by weight during said milling. 3. The process according to claim 1, wherein the at least one inorganic pigment is calcium carbonate in the form of lime, chalk, calcite, marble, precipitated calcium carbonate, or a combination thereof. 4. The process according to claim 1, wherein said at least one polymer is a polyacrylate consisting of from 10 to 95% by weight of a C1-C10-alkyl (meth)acrylate, from 0 to 60% by weight of a vinylaromatic compound, from 1 to 5% by weight of an acid monomer, and from 0 to 10% by weight of a further monomer. 5. The process according to claim 1, wherein said at least one polymer is a polyacrylate consisting of from 10 to 95% by weight of a C1-C10-alkyl (meth)acrylate, from 0 to 60% by weight of a vinylaromatic compound, and from 1 to 5% by weight of an acid monomer. 6. The process according to claim 1, wherein a weight ratio of inorganic pigment to polymer in said first and second aqueous dispersions is between 99:1 and 1:1. 7. The process according to claim 1, wherein the second aqueous suspension comprising the polymer-pigment hybrid comprises from 5 to 80% by weight of said inorganic pigment, from 1 to 30% by weight of said polymer and from 19 to 94% by weight of water. 8. The process according to claim 1, wherein the second aqueous suspension comprising the polymer-pigment hybrid further comprises from 0.01 to 2% by weight of at least one dispersant. 9. The process according to claim 1, wherein the polymer-pigment hybrid has a mean particle diameter of from 0.01 to 50 μm. 10. The process according to claim 1, wherein said second aqueous suspension is added to the paper stock in an amount so that from 5 to 70% by weight of said polymer-pigment hybrid is present in the paper stock, based on the weight of dry paper stock. 11. The process according to claim 6, wherein a weight ratio of inorganic pigment to polymer in said first and second aqueous dispersions is between 70:1 and 30:1. 12. The process according to claim 10, wherein said second aqueous suspension is added to the paper stock in an amount so that from 20 to 50% by weight of said polymer-pigment hybrid is present in the paper stock, based on the weight of dry paper stock. 13. The process according to claim 1, wherein no free polymer is present in said second aqueous suspension after said milling is carried out. 14. The process according to claim 1, wherein said milling is carried out at a temperature of from 0 to 95° C. 15. The process according to claim 1, wherein said milling is carried out at a temperature of from 15 to 80° C. 16. The process according to claim 1, wherein said milling is carried out at a temperature of from 20 to 55° C. 17. The process according to claim 1, wherein said polymer-pigment hybrid comprises a chemical bond between the polymer and the pigment. 18. The process according to claim 1, wherein said polymer is adsorbed on a surface of said pigment. 19. The process according to claim 1, wherein said at least one polymer is a polydiene consisting of from 10 to 90% by weight of an aliphatic hydrocarbon having two double bonds, from 10 to 90% by weight of a vinylaromatic compound, from 0 to 20% by weight of an acid monomer, and from 0 to 20% by weight of a further monomer. 20. The process according to claim 1, wherein said at least one polymer is a polyacrylate consisting of from 10 to 95% by weight of a C1-C10-alkyl (meth)acrylate, from 0 to 60% by weight of a vinylaromatic compound, from 0 to 20% by weight of an acid monomer, and from 0 to 10% by weight of a further monomer. 21. The process according to claim 1, wherein said at least one polymer is a polydiene consisting of from 10 to 90% by weight of butadiene, from 10 to 90% by weight of styrene, and from 0 to 20% by weight of an acid monomer. 22. The process according to claim 1, wherein said polyethylene wax has a melt mass flow rate in the range from 1 to 50 g/10 min measured at 160° C. and a load of 325 g according to EN ISO 1133. 23. The process according to claim 1, wherein said polyethylene wax has an acid number of from 100 to 300 mg KOH/g of wax, determined according to DIN 53402. 24. The process according to claim 1, wherein said polyethylene wax has a density of from 0.89 to 1.10 g/cm3, determined according DIN 53479. 25. A process for making a filler-containing paper or product thereof, comprising: dispersing at least one inorganic pigment and at least one polymer in water to obtain a first aqueous suspension;milling said first aqueous suspension in a ball mill to obtain a second aqueous suspension comprising a polymer-pigment hybrid as a filler;optionally drying said second aqueous suspension to obtain a dried polymer-pigment hybrid;optionally redispersing the dried polymer-pigment hybrid in water;adding said second aqueous suspension or the redispersed polymer-pigment hybrid in water to a paper stock; anddraining the paper stock to obtain a sheet,wherein said at least one polymer is a polydiene consisting of from 10 to 90% by weight of an aliphatic hydrocarbon having two double bonds, from 10 to 90% by weight of a vinylaromatic compound, from 0 to 20% by weight of an acid monomer, and from 0 to 20% by weight of a further monomer, ora polyacrylate consisting of from 10 to 95% by weight of a C1-C10-alkyl (meth)acrylate, from 0 to 60% by weight of a vinylaromatic compound, from 0 to 20% by weight of an acid monomer, and from 0 to 10% by weight of a further monomer, andwherein the milling of said second aqueous suspension is carried out in the presence of a polyethylene wax, said wax comprising, in copolymerized form,from 20.5 to 38.9% by weight of at least one ethylenically unsaturated carboxylic acid,from 60 to 79.4% by weight of ethylene, andfrom 0.1 to 15% by weight of at least one ethylenically unsaturated carboxylate. 26. The process according to claim 25, wherein said polyethylene wax has a melt mass flow rate in the range from 1 to 50 g/10 min measured at 160° C. and a load of 325 g according to EN ISO 1133. 27. The process according to claim 25, wherein said polyethylene wax has an acid number of from 100 to 300 mg KOH/g of wax, determined according to DIN 53402. 28. The process according to claim 25, wherein said polyethylene wax has a density of from 0.89 to 1.10 g/cm3, determined according DIN 53479.
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