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US 6,641,762 B2Granted
Mixed PMDI/solid novolac resin binders for the production of wood composite products
AssigneesBayer Aktiengesellschaft, Borden Chemical, Inc.
InventorsJames W. Rosthauser, H. Georg Schmelzer
Life of this patent
Estimating the term…
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 novolac 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 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% up 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 novolac 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 novolac 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 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% up 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.