DISPERSION AGENT COMPOSITION, ITS USE AND COATING COMPOSITION COMPRISING THE SAME AND METHOD FOR IMPROVING VISCOSITY PROPERTIES OF A COATING COMPOSITION OR SLURRY

摘要

The invention relates to a dispersion agent composition for pigment pastes and/or slurries comprising calcium sulphate and used in coating of paper or board. The dispersion agent composition comprises a first component, which comprises a polycarboxylate based first dispersion agent constituent, and a second component, which comprises a water-soluble copolymer of monomers or a derivative of the copolymer. These monomers comprise sulphonic acid and a carboxylic acid groups. The invention relates also to the use of the dispersion agent composition and a coating composition. Further, the invention elates to a method for improving viscosity properties of coating compositions and/or slurries comprising calcium sulphate.