Patent ID: 6224974
Filing Date: 2001-05-01
Classification: D21H,Y10T

Abstract:
A method for making a water resistant caustically soluble aqueous paper coating to be applied to a top side of a paper label for a glass object recyclable in a caustic washing solution, comprising the steps of mixing with water:(a) a binder made of at least 40% caustic-soluble material to provide dissolvability in the caustic washing solution,(b) a water repelling agent for adding water repellency to the coating, and(c) pigment including one or more of clay, TiO.sub.2, calcium carbonate, and calcined clay, for providing opacity and brightness to the coating,to a solids level of at least 45%, whereby said paper label coating is water repellent but permits disintegration of the water repellent coating to permit the caustic washing solution to dissolve and repulp the coated paper label from the glass object.