Process for preparing self-binding pigment particle suspensions
AssigneeOmya International AG
InventorsDaniel Gantenbein, Joachim Schoelkopf, Patrick A.C. Gane
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Abstract
The invention relates to a process for preparing self-binding pigment particle suspensions, to a self-binding pigment particle suspension as well as to a paper product comprising self-binding pigment particles and to the use of the self-binding pigment particle suspension as filler material.
Claims27
Paper, plastic, paint, concrete or an agriculture product comprising self-binding pigment particles prepared by the process comprising the following steps:
- a) providing an aqueous pigment material suspension, wherein the pigment of the pigment material suspension comprises calcium carbonate;
- b) providing a polymeric binder, wherein the binder consists of at least one polysaccharide comprising galactose and/or mannose units;
- c) mixing 0.1 wt.-% to 10 wt.-% of the binder of step b), based on the total weight of the aqueous pigment material suspension, with the aqueous pigment material suspension of step a), to obtain a mixture of the binder and the aqueous pigment material suspension;
- and
- d) grinding the mixture of the binder and the aqueous pigment material suspension obtained in step c) to obtain a suspension of self-binding pigment particles, wherein the weight median diameter (d50) of the self-binding pigment particles is less than the weight median diameter (d50) of the pigment from step a).
The process according to claim 26, wherein grinding step d) is carried out until the fraction of self-binding pigment particles having a particle size of less than 1 μm is greater than 20 wt.-%, based on the total weight of the pigment particles.
Dependencies are inferred from the claim text.