Composition for providing barrier properties, its use and a sheet-like product
AssigneeKemira Oyj
InventorsJaana Laine, Kaisa Karisalmi
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Abstract
The invention relates to a composition for providing barrier properties for a cellulosic fibre web, such as paper, board or the like. The coating composition comprises microfibrillated non-wood biomass, having a particle size D90<250 μm and particle size D50<100 μm, which microfibrillated non-wood biomass comprises at least 5 weight-% of a hemicellulose fraction and/or pectin, calculated from the dry weight of the microfibrillated non-wood biomass; an auxiliary agent comprising at least one cellulose derivative, and/or a synthetic binding agent, such as polyvinyl alcohol or polystyrene acrylate copolymer.
Claims12
A coating composition for providing barrier properties for a cellulosic fibre web, wherein the coating composition is in a form of an aqueous dispersion having a solids content of 1-30 weight-%, the coating composition comprising:
- 20-60 weight-% of microfibrillated non-wood biomass, having a particle size D90<250 μm and a particle size D50<100 μm, which microfibrillated non-wood biomass comprises at least 5 weight-% of a hemicellulose fraction and/or pectin, calculated from a dry weight of the microfibrillated non-wood biomass;
- 10-55 weight-% of an auxiliary agent comprising at least one cellulose derivative selected from water-soluble cellulose ethers selected from the group consisting of alkyl celluloses, hydroxyalkyl celluloses, hydroxyalkyl alkyl celluloses and any of their mixtures;
- and
- 20-60 weight-% of a synthetic binding agent selected from, polyvinyl alcohol or polystyrene (meth)acrylate copolymer.
Dependencies are inferred from the claim text.