Method for preparing a dry cationic hydrogel polymer product, polymer product and its use
AssigneeKemira Oyj
InventorsRonald VAN ROSSUM, Susanna HOLAPPA, Lasse KYLLÖNEN
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Abstract
The invention relates to a method for preparing a dry cationic hydrogel polymer product. The method comprises polymerisation of a reaction mixture comprising ethylenically unsaturated monomers in presence of water and initiator(s) by radical polymerisation and obtaining a hydrogel polymer. The hydrogel polymer is comminuted by chopping or shredding, and dried, whereby a dry hydrogel polymer product in powder form is obtained. At least one cationic reverse phase emulsion polymer is added to the hydro polymer at the comminuting step. The invention relates also to a dry cationic hydrogel polymer composition prepared by the method and its use.
Claims11
Method for preparing a dry cationic hydrogel polymer product, the method comprising
- polymerising a reaction mixture comprising ethylenically unsaturated monomers in presence of water and initiator(s) by radical polymerisation and obtaining a hydrogel polymer,
- comminuting the hydrogel polymer by chopping or shredding, and
- drying the hydrogel polymer, whereby a dry hydrogel polymer product in powder form is obtained,
- wherein
- adding at least one cationic reverse phase emulsion polymer is added to the hydro polymer at the comminuting step.
Dependencies are inferred from the claim text.