Abstract: A durable aqueous solution of a thermosetting resin having a relatively high solid content which imparts a high degree of wet strength to paper, is produced by the reaction of an aliphatic dicarboxylic acid with a polyalkylenepolyamine to form a polyamidopolyamine, which is successively subjected to reaction with epichlorohydrin, the first reaction being carried out using a molar ratio of aliphatic dicarboxylic acid to polyalkylenepolyamine of 1:1.0 to 1.2 and continued until the viscosity at 25.degree. C. of 50% aqueous solution of resulting polyamidopolyamine reaches 400 to 1,000 cps, and the second reaction being carried out using epichlorohydrin in an amount of 1.6 to 1.7 moles per mole of the polyamide secondary amine and continued until the viscosity at 25.degree. C. of 15% aqueous solution of the resulting product reaches 30 to 150 cps.

Abstract: An improved dielectric printing paper and process for making the same, characterized by excellent resolution, contrast, and feel. The paper incorporates an inorganic salt such as magnesium chloride as a conductivity-providing ingredient. The dielectric coating is formed with a high loading of inorganic fillers and is applied by a dry process to form a discontinuous dielectric coating on the conductive paper substrate.

Abstract: A method is provided for the stabilization of a high loft, low density, air-laid pad of short length fibers by the formation of a thin, reinforcing layer on a surface thereof. The film is formed by first pretreating a surface of the pad with a light spray (at a level not higher than about 15 cc per sq. meter of the pad) of a solution of a coagulating material for a resin dispersion, and then applying the resin dispersion to the pretreated surface and limiting its penetration into the pad by instant coagulation thereof.

Abstract: A polymer is described which has particular utility as an additive imparting wet and dry strength to a paper base. The polymer is formed by the reaction of a polymer of an N,N-disubstituted vinyl-benzyl amine or homologue thereof with an epihalohydrin.

Abstract: A process for separating a collated stack of carbonless copy paper sheets into form sets, which comprises pretreating the edge of the stack of sheets to be padded with water or an aqueous solution or dispersion, drying, applying an adhesive composition, drying and separating the unit sets.

Abstract: A method of and apparatus for reducing the density and increasing the bulk of a fibrous web having an initial basis weight between 20 and 60 pounds per ream and an initial nondirectional breaking length between 50 and 500 meters.The web is loosely placed between a pair of wire screens. The screens and the web are then transported past a nozzle assembly that impinges a gaseous medium onto the surface of the web with sufficient velocity so that the fibrous web is decompacted throughout the entire thickness of the web.

Abstract: In a process for the manufacture of a lithographic printing plate having a paper base and a lithographic printing surface thereon comprising a resinous coating, lower coat weights leading to high coating speeds can be obtained by first smoothing the base to not substantially greater than about 150 Sheffield units, then size-pressing onto the smooth base either a barrier coat for the lithographic printing surface or a single coat comprising said lithographic printing surface.

Abstract: A method of printing on thermographic paper according to which the heat for causing the imaging color change in the thermographic coating is generated by means of current in a portion of the coating dampened by a thin film of a conductive salt solution which is dispensed on the thermographic coating. The current is generated by a printing head having spaced electrodes in contact with the dampened portion of the coating. The conductive salt solution may be deposited on the thermographic coating in liquid film form, combined with a thermographic material to form a conductive coating for printing in the dry state, or mixed with the thermographic material in liquid form and dispensed on plain paper in a thin film in the path of the writing head.

Abstract: An improvement in enhancing the moisture attributes of boxboard and paperboard, a coating of a flexible film forming material is applied preferably by means of a printing roller to the surface of said boxboard before any moisture barrier lacquer is applied to the same.

Abstract: Satisfactory or enhanced dry bond between the gypsum core of plasterboard and paper facing sheets is achieved by treatment of at least the inner faces of the paper sheets with a water soluble zirconium salt before contacting the sheets with a core slurry containing gypsum plaster and starch as a dry bond assistant. The preferred zirconium salt is zirconium acetate although other salts such as oxychloride, nitrate and sulphate can also be used. The preferred level of zirconium is from 1 to 2 g. per square meter of paper, expressed as zirconium dioxide, and excellent dry bonds are formed with as little as 0.2% starch by weight of core solids, which represents an important economy in the use of starch.

Abstract: In coating a support, such as a flexible web of synthetic organic polymer, with a coating composition comprising a film-forming material in an evaporable liquid vehicle, at least two of (1) the temperature of the atmosphere in the coating zone, (2) the temperature of the coating composition at the point where it is coated on the support, and (3) the temperature of the support at the point where the coating composition is applied thereto, are maintained at a temperature substantially equivalent to the equilibrium surface temperature of the coated layer within the coating zone. The equilibrium surface temperature is defined as the temperature assumed by the surface of a layer of the coating composition under steady state conditions of heat transfer following evaporative cooling of the layer in the coating zone. Such temperature control minimizes thermal gradients within the coated layer and significantly reduces the formation of mottle and similar coating defects.

Abstract: Leaching of a fire retardant salt, such as a mixture of ammonium phosphates, impregnated into a wood substrate is inhibited by a process comprising:A. impregnating the wood substrate with an aqueous solution of a cyclic sulfonium zwitterion (CSZ), exemplified by structural formula (I), andB. curing the resulting CSZ-impregnated wood substrate. ##STR1## CSZ impregnation of the wood substrate can be either concurrent with or subsequent to the fire retardant salt impregnation of same. This process provides a significant degree of leach protection to otherwise very leachable fire retardant salts.

Abstract: A method for applying various coating liquids on the surface of a travelling web, such as plastic films, paper, metallic sheets, etc., with a discontinuity thereon, e.g., due to a connection of pieces of the web comprising preworking a web portion so that the web surface downstream of the discontinuity is coplanar to or higher than the maximum height of the discontinuity, whereby irregularities in coating of liquids are eliminated.

Abstract: Intumescent compositions are described which when deposited on a substrate protect the substrate against heat and fire damage for an appreciable time, and these compositions are readily removed from the substrate by water washing or water scrubbing both before and after intumescing. Another advantage of these compositions is that they give off very little smoke when exposed to heat and fire. The most effective of these compositions comprise monoammonium phosphate and/or diammonium phosphate as a heat- and fireproofing agent, urea and/or cyanoguanidine (dicyandiamide) as a gas forming or gas generating agent to promote the intumescence, sucrose (sugar) together with the phosphate to promote initial intumescence at low temperature and titanium dioxide as a heat-reflecting agent. Certain possible alternatives to the compounds named above are also named.

Abstract: This invention relates to an improvement in a process for preparing reinforced, artificial sausage casings wherein a tubular porous web is passed through a die, impregnated with a polymeric dope, and the polymer regenerated. The improvement resides in employing a porous web having incorporated therein from about 25 to 500 ppm based on the dry weight of the porous web of an alkyl imidazoline ethoxylate of the formula ##EQU1## wherein R is a fatty acid radical having from 10 - 22 carbon atoms in the structure and x is a number from about 3 - 10.

Abstract: A high pressure laminate comprising an overlay sheet impregnated with a melamine resin, and an unimpregnated decorative sheet of fibrous cellulosic material, a thin resin coating on preferably the backside of said decorative layer, and a core comprising a multiplicity of sheets of cellulosic material impregnated with a phenolic resin.

Abstract: Surface-treated paper in the form of a continuous web is made by first roughening a base paper which serves as a starting material on the sides to be treated. The roughened web is then passed over and in direct contact with a discharge slot from a container that extends across the web and through which the desired treatment liquid is flowed onto the surface of the web, and the surface-treated paper is then dried and finally reeled.

Abstract: A method of applying a stable, aqueous, low viscosity resin composition to porous or absorbent materials and controlling the migration thereon which comprises: treating the porous or absorbent materials with an alkaline material to raise its pH above about 7 and give it an alkaline reserve potential; and applying to the porous or absorbent materials a stable, aqueous, acidic low viscosity resin composition having a viscosity of less than about 1,000 centipoises and an acidic pH less than about 7 and comprising from about 10% to about 60% by weight on a solids basis of a synthetic resin and from about 0.

Abstract: A water resistant corrugated paperboard material is prepared wherein the paperboard components (medium and liner or liners) are each coated on both sides with a thermoplastic film which acts as a water barrier and a water resistant adhesive for bonding the components together. The corrugated medium is also pretreated with an internal size treatment to prevent edge wicking, and, for the purpose of corrugating the medium without deleteriously affecting the thermoplastic film, the corrugating rolls are preheated to a temperature slightly less than the melting point of the thermoplastic film while a lubricating material is simultaneously applied to either the corrugating rolls or the medium at the corrugating nip.