RHOBARR™ 620 Barrier Dispersion

An aqueous acid-modified dispersion intended for barrier coating on fiber based packaging applications. This base dispersion can be formulated with pigments (dry and slurries), various additives and other components as required, forming a resistant coating on proper curing. RHOBARR™ 620 Barrier Dispersion combines the performance of high-molecular weight thermoplastics with the application advantages of high-solid waterborne dispersions. The dispersion can be applied directly to paper, paperboard, or onto pre-coats such as styrene-acrylic, styrene-butadiene, pigmented systems, and starch using traditional wet application methods (e.g. air knife, rod, blade, curtain, printing techniques, dipping, spraying, etc.). In typical use, the dispersion is applied to achieve a dry coat weight of 4 to 10 g/m2 depending on end use and barrier requirements. Drying conditions will vary depending on the line speed and heating equipment. It is recommended that the surface temperature of the coating reach at least 80 degrees Celcius to achieve proper film formation and remove water to a suitable paper moisture level (application and type dependent, but typically 3-6 wt %).