Wood composites bonded with phenol-formaldehyde by steam injection pressing
AssigneeGeorgia-Pacific Chemicals LLC
InventorsPaul S. Baxter, Robert A. Breyer, Melissa J. Cannon, John D. Cothran, Jessica D. Jennings, James H. Knight, Herman D. Watts, Jr., Daniel C. Yeager
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Abstract
The present invention relates to a method for preparing a wood composite, and the related wood composite itself formed by steam injection pressing using a phenol-formaldehyde resin binder composition capable of rapidly curing in a saturated or superheated steam atmosphere.
Claims13
A method for preparing a wood composite by steam injection pressing of a mixture of wood pieces and binder using phenol-formaldehyde resin as binder characterized in that (1) from 80 to 20 percent by weight of the phenol-formaldehyde resin is supplied as an aqueous composition prepared at a formaldehyde to phenol mole ratio (F:P) in the range of 2.15:1 to 2.65:1, the phenol-formaldehyde resin supplied as the aqueous composition having a weight average molecular weight in a range of 2000 to 8000;
- (2) from 20 to 80 percent by weight of the phenol-formaldehyde resin is supplied as particulate solids with a mole ratio of formaldehyde to phenol (F:P) in the phenol-formaldehyde resin particulate solids in the range of 2.1:1 to 2.6:1, the phenol-formaldehyde resin supplied as particulate solids having a weight average molecular weight in a range of 1500 to 4500 and (3) steam is injected into the mixture of wood pieces and binder during formation of the wood composite at a maximum pressure within a range of 15 to 95 psig.
Dependencies are inferred from the claim text.