Pigment Concentrates

TEGO® VariPlus LK: Lower VOC Content in Pigment Concentrates

Emission limits for volatile organic compounds (VOC) are being lowered worldwide. As a result, coatings formulators are increasingly limited in their choice of raw materials and hence their formulations. TEGO® VariPlus LK, the new grinding resin, drastically lowers the VOC content in pigment concentrates for solventborne coatings and for the overall formulation.

Until now, solventborne pigment concentrates have generally  had a high VOC content, which affects the final VOC content of colored coatings. To reduce the high VOC content, Evonik has developed the grinding resin TEGO® VariPlus LK. This new resin reduces the viscosity of the concentrate, thus permitting optimized pigment loading. When used in combination with the dispersing additive TEGO® Dispers 676, 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.

TEGO® VariPlus LK is one of the first liquid grinding resins on the market. Until now, grinding resins have been supplied as granules which must be dissolved in a solvent. With TEGO® VariPlus LK, formulators will be able to eliminate this production step.

Advantages of TEGO® VariPlus LK

  • more formulation freedom
  • increased flexibility in the choice of raw materials
  • greater color diversity
  • elimination of production step "dissolving"
  • ultimate viscosity reduction with TEGO® Dispers 676

The new grinding resin is compatible with all common binders, with only minimal effect on coating properties.

Tested binder systems

  • short-oil alkyd resin
  • medium-oil alkyd resin
  • long-oil alkyd resin
  • self-crosslinking acrylate
  • 2-pack PU acrylate
  • 1-pack polyester
  • 2-pack polyester
  • polyether
  • poly-aspartic acid ester
  • epoxy resin
  • nitrocellulose
  • urea-formaldehyde resin