Composition for bonding solid lignocellulosic materials
AssigneeCarbocol Inc.
InventorJohn Stofko
Life of this patent
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Abstract
Wood surfaces are bonded together by heating and pressing using a preferably dry binder formulation constituting a thorough mixture of an isocyanate and a sugar or starch, the binder formulation also preferably containing a stabilizer and optionally a catalyst and a release agent. The binder formulation may be used with good results in an amount equal to the amount of straight isocyanate resin which would normally be used, i.e. the sugar or starch replaces a quantity of the isocyanate which would normally have been used, thereby reducing the total quantity of isocyanate, thus reducing cost without any disadvantage.
Claims15
A method of bonding wood surfaces together and thereby producing a consolidated wood product, which comprises
- contacting said wood surfaces with an amount of bonding material of 1-15 grams per square foot area or 1-12% by weight based on the weight of wood, said bonding material consisting essentially of a homogeneous mixture, initially reacted in the substantial absence of water, of 50-95% by weight of starch or sugar or other active material, 5-50% of liquid isocyanate, 0-10% catalyst, 0-50% stabilizing agent and 0-10% release agent, or a glucourethane reaction product thereof, the total quantity of said liquid isocyanate being 0.25-2% by weight based on the weight of the wood;
- pressing the coated wood surfaces together at an elevated temperature and for a time sufficient to effect bonding to produce said bonded wood product.
A method of bonding wood surfaces together and thereby producing a consolidated wood product, comprising
- contacting said wood surfaces with a homogeneous dry powdery bonding material in an amount of 1-15 grams per square foot area or 1-12% by weight based on the weight of the wood, said dry powdery bonding material consisting essentially of a homogeneous mixture of 80-98% by weight of starch or sugar or other active material, 2-20% of liquid isocyanate, 0-10% catalyst, 0-50% stabilizing agent and 0-10% release agent, or a glucourethane reaction product thereof, the total quantity of said liquid isocyanate being 0.25-2% by weight based on the weight of the wood;
- and
- pressing the coated wood surfaces together at an elevated temperature and for a time sufficient to effect bonding to produce said bonded wood product.
Dependencies are inferred from the claim text.