Abstract: Paper of dry strength is produced by forming an aqueous solution of papermaking cellulose fibers and adding thereto a 90:10 to 98:2 copolymer of acrylamide and maleic acid followed by addition of alum. The use of the acrylamide-maleic acid copolymer allows production of paper at a much broader pH range towards the alkaline side which eliminates the need for close control of pH and which substantially reduces corrosion of the papermaking equipment.

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: Paper of high dry strength is produced by forming an aqueous solution of cellulose fibers and adding thereto a polymeric product of acetone, formaldehyde and polyethylene polyamine, which product is prepared at reflux temperature in presence of a catalytic amount of a strong inorganic acid and has a mol ratio of 1:3:0.5, respectively.

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.