Patent ID: 7939138
Filing Date: 2011-05-10
Classification: D06M,D21H,Y10T

Abstract:
1. A method of providing grease resistance to a water-absorbent substrate comprising: applying an aqueous solution of a cross-linking agent to the water-absorbent substrate, the cross-linking agent comprising a borate, and then drying the water-absorbent substrate to a liquid content less than about 20% by weight, and then applying to the water-absorbent substrate an aqueous solution of a coating polymer, the coating polymer comprising a polyol, wherein about 1 to about 200 pounds of the coating polymer is applied to the water-absorbent substrate per ton of the substrate, and then drying the substrate; wherein the cross-linking agent cross-links the polyol after the substrate has been treated with the coating polymer to form a grease-resistant coating on the substrate; and wherein a mass ratio of the polyol applied to the substrate to the cross-linking agent applied to the substrate is in a range of about 1:1 to about 5:1.