US 2022/0289980 A1 · SURFACE MODIFYING AGENT FORMULATION

Abstract

The present invention describes the production of wood panel boards, or the like, in which a surface modifying agent is mixed with a polyol to prepare a stable surface modifying agent polyol composition. The resultant composition is reacted with an isocyanate, and in particular, a polymeric di-isocyanate resin, in the presence of wood chips, fibers or the like, for the production of lignocellulosic based panels, such as oriented strand board (OSB), MDF, HDF and particle board panel products. In use, the surface modifying agent polyol composition is mixed with the polymeric di-isocyanate resin and the resultant mixture is applied to a lignocellulosic material, such as wood chips or fibers, immediately prior to hot pressing of the mixture to produce the panels. Sticking of the panels to the metal press belts or press plates typically used during production, is reduced or eliminated.

Claims21

Dependent claims

A method for the production of a cured lignocellulosic panel comprising:

preparing an isocyanate-containing mixture;
spraying said resin mixture onto a lignocellulosic material to produce a sprayed mat of lignocellulosic material;
compressing said sprayed mat of lignocellulosic material in a press, at pressures of between 1 to 8 MPa specific pressure in a press heated to a temperature of between 150° C. to 220° C. to form the cured lignocellulosic panel;
and
removing said cured lignocellulosic panel from said press, wherein the resin mixture comprises an isocyanate resin in admixture with a surface modifying agent polyol comprising a mixture of a polyol and a surface modifying agent, wherein said surface modifying agent is a carboxylate having the formula (I):
wherein M is a metal selected from the group consisting of Group 1A, 2A, 4B, 4A, 1B, 2B and 8 of the Periodic Table of Elements;
and
R is a saturated or unsaturated hydrocarbon, and R is, or includes, a primary, secondary or tertiary alcohol, and has a hydroxyl functionality of between 1 and 5.

5 more elements

Dependencies are inferred from the claim text.

Surface modifying agent formulation

Life of this patent

Surface modifying agent formulation

Life of this patent

Abstract

Claims21