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AssigneeGeorgia-Pacific Resins, Inc.
InventorsF. C. Dupre, Millard E. Foucht, William P. Freese, Kurt D. Gabrielson, Benjamin D. Gapud, W. Hayes Ingram, Ted M McVay, Richard A. Rediger, Kelly A. Shoemake, Kim K. Tutin, James T. Wright
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The preparation of phenol-formaldehyde and melamine-formaldehyde resin-based binders extended with a cyclic urea-formaldehyde prepolymer and to products prepared using the binders. More particularly, the invention relates to a cyclic urea prepolymer comprising urea, formaldehyde, and ammonia or a primary amine which, when added to a phenol-formaldehyde or melamine-formaldehyde based resin, results in a useful binder for the manufacturer numerous articles.
A consolidated wood product comprising a substrate and an adhesive comprising a phenol-formaldehyde resin modified with 1 to 95 wt % based on resin solids of a cyclic urea prepolymer either during manufacture of the resin or post added to the resin wherein the cyclic urea prepolymer has a mole ratio of urea:formaldehyde:ammonia or a primary amine of about 0.1 to 1.0:0.1 to 3.0:0.1 to 1.0, wherein said consolidated wood product is selected from the group consisting of plywood, oriented strand board, wafer board, engineered lumber, particle board, hardboard and medium density fiber boards.
Dependencies are inferred from the claim text.