The present invention relates to a particulate kaolin suitable for use as a filler material in compositions for making uncoated paper, the kaolin having a mean particle size ranging from 0.7 μm to 3 μm and a shape factor of at least 60. The invention also relates to compositions comprising
The present invention relates to a particulate kaolin suitable for use as a filler material in compositions for making uncoated paper, the kaolin having a mean particle size ranging from 0.7 μm to 3 μm and a shape factor of at least 60. The invention also relates to compositions comprising a particulate kaolin, and methods for making uncoated paper sheets.
대표청구항▼
The invention claimed is: 1. A particulate kaolin, wherein the kaolin has a mean particle size ranging from 0.9 μm to 2.5 μm, and a shape factor of at least 60. 2. The particulate kaolin according to claim 1, wherein the shape factor is at least 65. 3. A composition comprising filler
The invention claimed is: 1. A particulate kaolin, wherein the kaolin has a mean particle size ranging from 0.9 μm to 2.5 μm, and a shape factor of at least 60. 2. The particulate kaolin according to claim 1, wherein the shape factor is at least 65. 3. A composition comprising filler materials, wherein the composition comprising filler materials comprises the particulate kaolin according to claim 1, and at least one additional filler chosen form hydrous kaolin, calcined kaolin, talc, calcium sulfate and alkaline earth metal carbonates. 4. The composition according to claim 3, wherein the composition comprises particulate kaolin in amount ranging from at least 50% by weight, relative to the total weight of the composition. 5. The composition according to claim 4, wherein the composition comprises particulate kaolin in amount ranging from 60% to 80% by weight, relative to the total weight of the composition. 6. The composition according to claim 3, wherein the at least one additional filler comprises calcium carbonate. 7. The composition according to claim 6, wherein the calcium carbonate comprises a material obtained from a natural source and processed by grinding. 8. The composition according to claim 6, wherein the calcium carbonate comprises a material prepared by chemical synthesis. 9. The composition according to claim 8, wherein at least one additional solid is bonded to the calcium carbonate. 10. The composition according to claim 6, wherein the calcium carbonate has a mean particle size ranging from 0.5 μm to 1.5 μm. 11. The composition according to claim 10, wherein the calcium carbonate has a mean particle size ranging from 0.7 μm to 1.3 μm. 12. The composition according to claim 6, wherein the calcium carbonate has a steepness factor of at least 40. 13. The composition according to claim 12, wherein the calcium carbonate has a steepness factor of at least 50. 14. The composition according to claim 6, wherein the calcium carbonate is in the form of a composition containing at least one chemical additive in an amount ranging from greater than 0 to 15% by weight on an active basis, wherein said at least one chemical additive is capable of stabilizing the carbonate in acidic conditions. 15. The composition according to claim 6, wherein the particulate kaolin has a mean particle size of at least 1.2 μm, and wherein the weight ratio of kaolin:calcium carbonate in the composition is at least 50:50. 16. The composition according to claim 15, wherein the particulate kaolin has a mean particle size ranging from 1.2 μm to 1.7 μm, and wherein the weight ratio of kaolin:calcium carbonate in the composition ranges from 60:40 to 80:20. 17. The composition according to claim 6, wherein the particulate kaolin has a mean particle size ranging from 0.9 μm to 1.2 μm, and wherein the weight ratio of kaolin:calcium carbonate in the composition to 50:50 or less. 18. The composition according to claim 17, wherein the particulate kaolin has a mean particle size ranging from 1.2 μm to 0.9 μm, and wherein the weight ratio of kaolin:calcium carbonate ranges from 40:60 to 20:80. 19. A method of making uncoated paper sheets, comprising preparing an aqueous paper-making composition from a pulp and mineral filler particles, and forming the composition into paper sheets, wherein the mineral filler particles comprise a composition according to claim 3. 20. The method according to claim 19, wherein the paper sheets are calendared by a supercalendar process. 21. The method according to claim 19, wherein the pulp comprises mechanical pulp in an amount ranging from at least 70% by weight. 22. The method according to claim 19, wherein the paper sheets are suitable for printing upon by a process chosen from a gravure printing process and an offset printing process. 23. A method of making uncoated paper sheets, comprising preparing an aqueous paper-making composition from a pulp and mineral filler particles, and forming the composition into paper sheets, wherein the mineral filler particles comprise a particulate kaolin according to claim 1. 24. The method according to claim 23, wherein the paper sheets are calendared by a supercalendar process. 25. The method according to claim 23, wherein the pulp comprises mechanical pulp in an amount ranging from at least 70% by weight. 26. The method according to claim 23, wherein the paper sheets are suitable for printing upon by a process chosen from a gravure printing process and an offset printing process.
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