| 摘要 |
Pigment comprises calcium carbonate and its reaction products with medium to strong acids and aluminum silicate, synthetic silica, calcium silicate and/or a monovalent metal silicate and/or aluminum hydroxide and/or sodium and/or potassium aluminate. The pigment has a monovalent metal silicate content of less than 0.1% by dry weight of calcium carbonate and has a pH above 7.5. Mineral pigment containing calcium carbonate comprises a product formed in situ by double and/or multiple reaction with gaseous carbon dioxide formed in situ and/or derived from an external source, and the reaction products of this carbonate with one or more medium to strong hydroxonium ion donors and at least one aluminum silicate and/or synthetic silica and/or calcium silicate and/or monovalent metal silicate, e.g. sodium, potassium and/or lithium silicate, preferably sodium silicate, and/or aluminum hydroxide and/or sodium and/or potassium aluminate. The pigment has a monovalent metal silicate content of less than 0.1 % by dry weight of calcium carbonate and has a pH above 7.5. Independent claims are also included for: (1) a process for producing the pigment; (2) an aqueous suspension of the pigment, where the pigment has a BET surface area of 25-200 m 2>/g and a median particle size of 0.1-50 mu m and the suspension has a solids content of 0.3-80 wt.% and contains an anionic electrolyte in an amount of 0.05-5 % by dry weight of calcium carbonate; (3) inkjet printing paper containing and/or coated with the pigment or suspension. |
