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AssigneeValtion Teknillinen Tutkimuskeskus
InventorsHannu Mikkonen, Mauno Miettinen, Kirsi Kataja, Saija Luukkanen, Soili Peltonen, Pia Qvintus-Leino
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A material which is suitable as filler or coating pigment for a fibrous web and a method for manufacturing thereof. According to the method, a feed comprising organic polymer material is cooled to at least approximately −50° C., after which it is refined in a jet refiner to a desired particle size. The present invention generates uniform pigment particles which comprise, for instance, starch esters, and which particles have a porous surface structure, in which case they are suitable for instance as coating pigments and fillers for offset and ink-jet papers.
A method of manufacturing a material, which is suitable as filler or coating pigment for a fibrous web, according to which method a feed comprising polysaccharide-based organic polymer is refined to a desired particle size, characterized in that the feed is cooled and the refining is carried out in a jet refiner.
A pigment which is used for coating and filling of the fibrous web which comprises paper or cardboard, characterized in that said pigment comprises an organic polymer, the surface structure of which has been made porous and which porosity has been obtained by jet refining the product as a feed of a temperature of −50 . . . −195° C.
Dependencies are inferred from the claim text.