Until now, pigment concentrates have generally had a high VOC content, which largely determines the final VOC content of colored coatings. To reduce this high VOC content, Evonik has developed TEGO VariPlus LK grinding resin. The new resin reduces the viscosity of the concentrate, thus permitting optimized pigment loading. Used in combination with TEGO Dispers 676 dispersing additive, the VOC content in the concentrate can be lowered by up to 75%. For the overall formulation this means a VOC reduction of up to 100g/l when adding 20% concentrate.
For the formulator, this means more formulation freedom, increased flexibility in the choice of raw materials and greater color diversity. Because the grinding resin is liquid, dissolving is unnecessary thus eliminating a production step.
“VariPlus LK is one of the first liquid grinding resins on the market,” said Daniel Brünink, director global marketing Decorative Coatings. “Up to now grinding resins have been supplied as granules which have to be dissolved in a solvent. With VariPlus LK, formulators will be able to cut out this step.”