KURARAY POVAL™ is used for polyvinyl acetate emulsions, specifically in wood and paper adhesives. Kuraray’s specialty PVOH grades, like EXCEVAL™, are used for water-resistant wood adhesives. KURARAY POVAL™ can also be used in general-purpose adhesives such as textile, leather, wood, and porous ceramic surfaces.
The partially hydrolyzed grades of KURARAY POVAL™ are often selected for remoistening adhesives.
As an emulsifier, KURARAY POVAL™ and EXCEVAL™ are widely used as a protective colloid in the emulsion process. They are often used during the polymerization of vinyl acetate and vinyl acetate copolymer systems (vinyl acetate/ethylene, vinyl acetate/acrylic ester, etc.) to form high-solids emulsions with stability and adhesive properties. Kuraray PVOH products are also used in emulsions for non-vinyl acetate system (styrene/butadiene, styrene/acrylic ester, acrylic ester, etc.) lattices and bead or suspension polymerization of vinyl monomers like vinyl acetate, styrene, and vinyl chloride. KURARAY POVAL™ and EXCEVAL™ are also used during post-emulsification of hydrophobic substances like wax and asphalt.
EXCEVAL™ for Adhesives and Polymerization
Due to the high water resistance of EXCEVAL™, polyvinyl acetate emulsions using EXCEVAL™ can achieve D3 performance level without using crosslinking technology. If an even higher water resistance performance is needed, it can be achieved simply by using standard crosslinking technology.