Vylon GK780 Non-crystalline copolyester Toyobo Vylon Polyester ADHESIVE Highly polymerized copolyester resin that can be dissolved by general purpose organic solvents. For its dissolution property, this product is used for a variety of solution type adhesives. Provides adhesion to metal and corrosion resistance. Highly polymerized copolyester resin. Used in adhesives for flexible printed circuit board. Provides adhesion to metal and corrosion resistance.