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US 4,046,952 AGranted
Manufacture of overlayed product with phenol-formaldehyde barrier for polyisocyanate binder
AssigneeEllingson Timber Co.
InventorsPhilip D. Shoemaker, Hobert O. McQueary
Life of this patent
Estimating the term…
Abstract
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.
Claims11
A method of making an overlayed product with comminuted cellulosic material as the core thereof, comprising
- producing a furnish of the comminuted cellulosic material by mixing therewith an organic polyisocyanate which operates upon the application of heat and pressure to bond the material,
- preparing as assembly comprising a mat formed of such furnish and against a side of said mat a sheet overlay, with phenol-formaldehyde resin distributed in said overlay and presented by said overlay toward said mat, and
- consolidating the furnish in said mat and said overlay to form an integral product by the application of heat and pressure, the phenol-formaldehyde resin during such consolidation forming a resinous barrier inhibiting penetration of the polyisocyanate through the overlay.
In the manufacture of an overlayed product, the method comprising
- producing a furnish of comminuted cellulosic material by mixing it with an organic polyisocyanate which operates upon the application of heat and pressure to bond the material,
- preparing an assembly comprising a mat of such furnish with such mat disposed between overlays disposed on opposite sides of the mat, each of such overlays comprising a sheet and having phenol-formaldehyde distributed in the overlay presented by the overlay toward said mat, and
- consolidating the furnish in said mat and said overlays to form the product by the application of heat and pressure, the phenol-formaldehyde resin during such consolidation forming a resinous barrier inhibiting penetration of the overlays by said polyisocyanate.
Dependencies are inferred from the claim text.