Abstract: A two-component binder system for exterior grade fiberboard and other products, the first component comprising a stable aqueous solution of about 10 to 15 weight percent urea, about 30 to 40 weight percent formaldehyde, about 25 to 40 weight percent water, about 15 to 25 weight percent melamine, about 0.4 to 1.0 weight percent of a buffering agent which maintains the pH at about 6.5 to 7.0 and optionally up to about 6 weight percent of an alkanol of 1 to 6 carbon atoms, the solution having a viscosity when formed of less than about 60 cps and a viscosity after about 7 days of less than about 1000 cps. The second component is a solution comprising about 35 to 55 weight percent urea, about 45 to 65 percent water and optionally up to about 4 weight percent of a catalyst which promotes the reaction of urea, formaldehyde and melamine. The two components may be admixed at room temperature in a ratio of about 3 to 5 parts of the first component to one part of the second component to form the binder.

Abstract: A one-component curable amino resin binder system is disclosed for use in the preparation of fiberboard and other products wherein the binder system comprises formaldehyde, urea, an oxime compound soluble in the binder system, and optionally a water miscible alcohol and or melamine.

Abstract: Curable amino resins are prepared from a system having two components, each of which remains storage stable for extended periods of time. The two components are drawn from separate storage vessels and combined in an in-line mixer immediately prior to the point of use. The system reduces mixing costs and provides greater control over changes in viscosity, precipitation and resin particle size occurring during the mixing process. The resins are used as adhesives (binders) for wood fiber, particles and chips, as well as for paper products and plywood materials.

Abstract: Fiberboard is produced by a process in which fibrous material is impregnated with curable amino resins. The resins are prepared from a system having two components, each of which remains storage stable for extended periods of time. The two components are drawn from separate storage vessels combined in an in-line mixer and sprayed onto the fibrous material. The process reduces mixing costs and provides greater control over changes in viscosity, precipitation and resin particle size occurring during mixing.