Vylon GK140 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. High molecular weight type of GK130 Highly polymerized copolyester resin. Used in adhesives for flexible printed circuit board.