Patent ID: 9272441
Filing Date: 2016-03-01
CPC Classification: B27N,B29C,E06B,Y10T

Claim Text:
1. A method of surface sealing a consolidated cellulosic article, comprising: compressing a mat comprising cellulosic material and a synthetic binding agent into a consolidated cellulosic article having a surface with pores, voids, and/or cracks, wherein the mat is compressed under an elevated temperature in the range of 300 to 500° F., the binding agent comprising at least one member selected from the group consisting of a phenol formaldehyde, a urea formaldehyde, a melamine modified urea formaldehyde, and an isocyanic resin; and applying a sealant composition to the surface of the consolidated cellulosic article and permitting the sealant composition to penetrate the surface pores, voids, and/or cracks and undergo cure while participating in a water-based foaming reaction to establish a water-resistant polymeric foam sealant impregnated into the consolidated cellulosic article, wherein the sealant composition is applied to the surface and the foaming reaction occurs at substantially room temperature, the water-resistant polymeric foam sealant comprising a member selected from the group consisting of a polyurethane and polyurea, the water for the water-based reaction originating with the consolidated cellulosic article.