Charge controlled phch
AssigneeOmya International AG
InventorsDaniel Gantenbein, Patrick A.C. Gane, Joachim Schoelkopf, Maximilian Laufmann, Lars Andersson
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Abstract
The present invention concerns a process for preparing self-binding pigment particles from an aqueous suspension of a calcium carbonate containing material, wherein an anionic binder and at least one cationic polymer are mixed with the suspension.
Claims25
Process for preparing self-binding pigment particles comprising the following steps:
- a) providing a suspension comprising at least one calcium carbonate containing material,
- b) providing an anionic polymeric binder, wherein said binder comprises at least one modified polysaccharide,
- c) providing at least one cationic polymer,
- d) mixing the suspension of step a) and the binder of step b), and
- e) grinding the mixed suspension of step d),
- wherein the at least one cationic polymer of step c)
- i) is mixed in step d) with the suspension of step a) and the binder of step b), and/or
- ii) is mixed with the suspension obtained after grinding step e), and the obtained mixture is deagglomerated.
A paper product comprising self-binding pigment particles, wherein the pigment particles comprise calcium carbonate containing material particles which are at least partially coated with an anionic polymeric binder comprising at least one modified polysaccharide and at least one cationic polymer.
Dependencies are inferred from the claim text.