Joncryl 646 Acrylic colloidal emulsion Johnson Polymer North America South and Central America Acrylic Resins >> Acrylic Emulsions Inks INKS Joncryl 646 is high molecular weight acrylic colloidal emulsion designed for cost-effective carbon black inks, letdown vehicles and corrugated inks. High molecular weight acrylic colloidal emulsion. Used for carbon black inks and corrugated inks.