Abstract: A solid, particulate reactant is continuously added to a first zone and a liquid reactant is continuously added to a second zone. A conduit between the zones allows the solid and liquid reactants to pass counter-currently between the zones, the reaction being accomplished on contact between the reactants. During steady state operation, a clear layer is established in each zone above a slurry layer of the particles in solution. The clear layer is withdrawn from the top of each zone and introduced at the bottom thereof causing agitation in the slurry layer which promotes the reaction. The solid reactant is withdrawn from the second zone while the spent liquid reactant is withdrawn from the first zone.

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: An aqueous adhesive composition having pH of about 8 to 10 containing from about 25 to 75% by weight of water, the water having dispersed therein:A. from about 25 to 75% by weight of the composition, of a water-insoluble linear polymer of interpolymerized monoethylenically unsaturated monomers in amounts by weight based on the linear polymer:(1) from about 50 to 99% of an acrylic ester monomer of the formula ##STR1## or a mixture thereof, where R is H or methyl and R.sup.2 is lower alkyl of 1 to 4 carbon atoms,(2) from about 0.1 to 10% of acrylic acid or methacrylic acid,(3) from about 0.1 to about 10% of a nitrogen containing monomer selected from the group consisting essentially of vinyl amines and salts thereof, vinyl ureido monomers, vinyl compounds having heterocyclic nitrogen containing groups, and mixtures thereof, andB. 0.001 to 2% of a silane containing both alkoxy and epoxy functionalities.

Abstract: Polyketone resins are used as an ingredient of the release coating for a flexible pressure-sensitive tape. The release coatings are printable and at the same time remain effective as release agents due to the presence of the polyketone resins. The polyketone resins are blended with a monomeric or polymeric release agent and an elastomeric or resinous film former to give the improved properties.

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: Display cards for thick packages such as tubes of cement are provided with an off-center hole for hanging on a pin and with a clipped upper corner that allows overlapping of the cards, close spacing, and simultaneous display of adjacent tubes of product.

Abstract: An adhesive composition which comprises for each 100 parts, by weight, of an aqueous dispersion having a pH of from about 3 to 10 of the following ingredients dispersed in 25 to 75 parts of water.A. from 25 to 70 parts by weight of a water insoluble polymer containing the following interpolymerized monoethylenically unsaturated monomers.A. at least 50% by weight, based on the polymer, of acrylate monomers;B. from about 0.1 to 10% by weight based on the polymer, of N-methylolacrylamide, andC. from about 0.1 to 25% by weight, based upon the polymer, of a monoethylenically unsaturated monomer containing carboxylic acid groupsD. from about 2 to 40% based upon the polymer of an acrylonitrileE. from 0 to 40% by weight based on the polymers of an addition polymerizable vinyl monomer other than those defined aboveF. from 0 to 1% by weight based on the polymer of a cross-linking agentB.

Abstract: This composition includes 50 to 85% by weight water, 10 to 25% relatively non-volatile inert organic solvent, 0.1 to 5% of a medium foamer detergent and 5 to 15% of a N-alkyl-2-pyrrolidone lubricant.

Abstract: Panels are provided with a glossy, tough coating by a method comprising the steps of applying on the panel surface a conventional resin adhesive; spreading thereon vinyl-modified lignocellulosic particles made by polymerization of vinyl monomers on substrate lignocellulosic particles; and subjecting the assembly to heat and pressure. Over a wide range of add-on ratio of vinyl polymer to lignocellulosic particles, coatings can be produced which have neither the solvent sensitivity of the polymer nor the water sensitivity of the cellulose. The novel, esthetically pleasing marbleized appearance is heightened by the use of dyed particles.

Abstract: Vinyl modified lignocellulosic particles are made by polymerization of vinyl monomer on substrate lignocellulosic particles. An improved initiator for the in situ polymerization such as sulfoxy compounds is provided. Over a wide range of add-on ratio of vinyl polymer to lignocellulosic particles, coatings for panels can be produced which have neither the solvent sensitivity of the polymer nor the water sensitivity of the cellulose.

Abstract: Paper of high dry strength is produced by adding to a solution of fibers from 0.1 to 2% of a cationic resin and from 0.1 to 2% of an anionic resin. Proportion of cationic to anionic resin is in the range of 99:1 to 50:50. The preferred cationic resin is a condensation product of acetone, formaldehyde and polyalkylene polyamine which is prepared in presence of a catalytic amount of a strong inorganic acid and has a mol ratio of 1:3:0.5, respectively. The anionic resin is a copolymer of acrylamide and maleic acid or its anhydride having a mol ratio of from 90:10 to 98:2.

Abstract: Gas stream containing primarily hydrogen and carbon monoxide as well as small quantities of acetylene, oxygen and ethylene is passed through a bed of copper catalyst to remove all or substantial portion of acetylene, oxygen and ethylene.

Abstract: An adhesive composition which comprises, for each 100 parts by weight thereof, an aqueous dispersion having pH of about 8 to 12 of the following components dispersed in 25 to 75 parts of water:A. from 25 to 75 parts by weight of water insoluble linear polymer containing the following interpolymerized unsaturated monomers in parts by weight based on the weight of the polymer:1. at least 50 parts and up to 99 parts of an acrylate monomer containing from about 4 to 27 carbon atoms selected from alkyl acrylates, alkyl methacrylates, and mixtures thereof:2. from about 0.1 to 10 parts of a nitrogen monomer selected from vinyl amines and salts thereof; vinyl ureido monomers; vinyl compounds having heterocyclic nitrogen containing groups and halogen, hydroxyalkyl or aminoalkyl substituted derivatives thereof; amino and loweralkyl amino loweralkyl acrylates and methacrylates; and mixtures thereof;3. from about 0.1 to 25 parts of an acid selected from acrylic acid, methacrylic acid and mixtures thereof;B.

Abstract: Improved high temperature and high humidity resistant release agents for pressure sensitive tapes are provided. Reaction products of (1) a polyanhydride resin and (2) water or an amine or an alcohol are applied as a thin coating to the tape to permit easy unwinding of the tape, even though it may have been stored at elevated temperature or humidity.

Abstract: A printing plate is coated with a composition comprising 20 to 50% saturated halogenated polyester, 10 to 45% polyacrylate, 5 to 15% metal acrylate and an effective amount of photoinitiator. The composition is applied in the form of a dispersion of the components in an inert organic solvent.

Abstract: Starter cultures for cheese production are prepared using culture media containing on a 100 parts dry basis 0.1 to 30 parts of a nitrogen source, 1-30 parts of a nitrogen source, 1-30 parts of a citrate source and a milk product being the remainder which is selected from the group consisting of undecalcified sweet whey or a major amount of undecalcified sweet whey and a minor amount of nonfat dry milk. The media results in a high and uniform bacteria count, and starter cultures produced therefrom produce cheese that cures fast and has enhanced flavor.

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: Methylenedisalicylic acid is added to ink containing a pigment derived from fluorescein to overcome tinting and scumming when the ink is used in offset printing.

Abstract: An improved apparatus for canning elongated, limp materials such as string beans or asparagus that includes a means for cutting the beans while in the can and means for adjusting the liquid in the head space of a can to a uniform and desired level. The improved process averts a separate clamping and cutting step formerly required in canning processes.

Abstract: This invention involves terpolymers of vinyl chloride, vinyl acetate and hydroxyalkyl acrylate wherein there is incorporated about 2.00 to about 5.5% by weight of the latter two monomers. These polymers provide efficacious protective coatings capable of forming a particularly effective adhesive bond to metallic substrates.