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US 6,641,761 B2Granted
Mixed PMDI/resole resin binders for the production of wood composite products
AssigneesBayer Aktiengesellschaft, Borden Chemical, Inc.
InventorsJames W. Rosthauser, William D. Detlefsen
Life of this patent
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Abstract
This invention relates to a process for the production of composite wood products. This process comprises a) applying a binder composition to wood particles, and b) molding or compressing the wood particles treated with the binder to form a composite wood product. Suitable binder compositions comprise a polymethylene poly(phenyl isocyanate) and a solid resole resin.
Claims12
A process for the production of wood composite materials comprising:
- A) combining wood particles with (1) a polymethylene poly(phenylisocyanate) having a functionality of about 2.1 to about 3.5, and an NCO group content of from about 25 to 33%, and a monomer content of from about 30% to 90% by weight, wherein the content of the monomer comprises up to about 5% by weight of the 2,2′-isomer, from about 1 to about 20% by weight of the 2,4′-isomer, and from about 25 to about 65% by weight of the 4,4′-isomer, based on the entire weight of the polyisocyanate;
- B) coating the combination formed in A) with (2) a solid resole resin;
- and
- C) molding or compressing the coated combination formed in B);
- wherein components (1) and (2) are present in amounts such that there is from 1 to 25% by weight, based on the total weight of the wood composite, of components (1) and (2), and the weight ratio of component (2) to component (1) is from 1:3 to 10:1.
2 more elements
A process for the production of wood composite materials comprising:
- A) combining wood particles with (2) a solid resole resin;
- B) coating the combination formed in A) with (1) a polymethylene poly(phenylisocyanate) having a functionality of about 2.1 to about 3.5, and an NCO group content of from about 25 to 33%, and a monomer content of from about 30% to 90% by weight, wherein the content of the monomer comprises up to about 5% by weight of the 2,2′-isomer, from about 1 to about 20% by weight of the 2,4′-isomer, and from about 25 to about 65% by weight of the 4,4′-isomer, based on the entire weight of the polyisocyanate;
- and
- C) molding or compressing the coated combination formed in B);
- wherein components (1) and (2) are present in amounts such that there is from 1 to 25% by weight, based on the total weight of the wood composite, of components (1) and (2), and the weight ratio of component (2) to component (1) is from 1:3 to 10:1.
2 more elements
Dependencies are inferred from the claim text.