Cyclic urea-formaldehyde prepolymer-modified melamine-containing resins, and use in binders for cellulosic-based composites
AssigneeGeorgia-Pacific Resins, Inc.
InventorsPablo G. Dopico, Brian M. Peek, Benjamin D. Gapud, Kelly A. Shoemake, James C. Phillips
Life of this patent
Estimating the term…
Abstract
A melamine-containing resin modified with a cyclic urea prepolymer comprising urea, formaldehyde and ammonia or a primary amine. The prepolymer-modified melamine-containing resin provides useful binders alone, or when combined or coreacted with other resins. Products prepared with the binder include wood composites such as particleboard and medium density fiberboard.
Claims19
A binder comprising a cyclic urea prepolymer;
- melamine or a melamine-containing resin;
- and at least one resin selected from the group consisting of urea-formaldehyde (UF), phenol-formaldehyde (PF), phenol-urea-formaldehyde (PUF), melamine-formaldehyde (MF), phenol-melamine-formaldehyde (PMF), melamine-urea-formaldehyde (MUF), and phenol-melamine-urea-formaldehyde (PMUF);
- wherein the cyclic urea prepolymer has mole ratios of urea:formaldehyde:ammonia or a primary amine between about 0.1 to 1.0:0.1 to 3.0:0.1 to 1.0, and wherein the cyclic urea prepolymer, the melamine or the melamine-containing resin, and the at least one resin are blended, coreacted, or both.
A consolidated wood product comprising a substrate and a wood binder comprising a cyclic urea prepolymer and melamine or a melamine-containing resin;
- wherein the cyclic urea prepolymer has mole ratios of urea:formaldehyde:ammonia or a primary amine between about 0.1 to 1.0:0.1 to 3.0:0.1 to 1.0, and wherein the cyclic urea prepolymer and melamine or the melamine-containing resin are blended or coreacted to form a cyclic urea prepolymer modified melamine-containing resin.
Dependencies are inferred from the claim text.