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CRAYVALLAC® PA4X20 is a pre-activated amide wax rheology modifier dispersed in a mixture of xylene and alcohols for sedimentation and sag control. Compared to CRAYVALLAC® PA3X20, this product is specifically designed for coating applications demanding a high degree of transparency or gloss. CRAYVALLAC® PA4X20 is best added to solvent-based industrial coatings following the pigment grind stage, where it provides good control of sedimentation and sag. When using a high-speed disperser, it is recommended that CRAYVALLAC® PA4X20 be added during the final stages of production, when the coating has been partially thinned to a viscosity of approximately 600 - 800 mPa.s (ICI cone and plate at 10000s -1) and the peripheral speed reduced to approximately 4 ms-1. Too high a speed results in destruction of the active components.
Arkema Rheology and Specialty Additives products include rheology modifiers, surface modifiers, and flow and leveling agents. Its products also include paint additives designed to improve properties like matting, anti-abrasion, slip and rub, sanding and texturing.