MANUFACTURE OF OVERLAYED PRODUCT WITH PHENOLFORMALDEHYDE BARRIER FOR POLYISOCYANATE BINDER

摘要

MANUFACTURE OF OVERLAYED PRODUCT WITH PHENOL-FORMALDEHYDE BARRIER FOR POLYISOCYANATE BINDER Production of consolidated overlayed product comprising a core of particulate cellulosic material bound with a polyisocyanate binder and an overlay bound to the core through a phenolformaldehyde resin which forms a barrier inhibiting penetration of the polyisocyanate into the overlay.