Abstract: Particulate thermosetting adhesive compositions exhibiting heat softening properties and capable of resisting penetration into porous substrates can be made at significantly lower cost than conventional adhesives by coating inorganic carrier particles with a previously prepared liquid thermosetting resin and spray drying the resulting mixture.

Abstract: Particulate thermosetting adhesive compositions exhibiting heat softening properties and capable of resisting penetration into porous substrates can be made at significantly lower cost than conventional adhesives by coating inorganic carrier particles with a previously prepared liquid thermosetting resin and spray drying the resulting mixture.

Abstract: Portable apparatus is used for dispensing of urea formaldehyde foam for use as a sound and heat insulator. The apparatus includes a framework having mounted therein three valves which are simultaneously actuated by a single handle lever. One valve dispenses air to a connection downstream of another of the valves which dispenses a mixture of water, detergent, and resin hardener while the third valve controls the flow of urea formaldehyde resin. The air and water-detergent mixture are combined in a frothing chamber and together they are conveyed in foamed condition to a mixing chamber. The resin is sprayed into the mixing chamber to combine with the froth and the resulting mixture is propelled into a cavity which will house the insulation.

Abstract: A foaming system includes a foaming agent solution and a resin solution. In a preferred embodiment, the foaming agent solution includes from 1.6 to 4.8 mmols of dibutyl naphthalene sulfonic acid as surfactant, from 5 to 20 mmols of phosphoric acid as catalyst and foam intumescent agent, from 0 to 45.5 mmols of resorcinol as foam anti-collapsing agent, from 9.1 to 54.6 mmols of chloral hydrate as fire retardant agent and sufficient water to make a solution of about 5% solids concentration. The resin solution includes urea formaldehyde resin produced by reacting from 1.0 to 2.4 mols of formaldehyde per mol of urea, from 6.5 to 500 mmols polyethylene glycol as foam charring component, from 0.3 to 1.