Abstract: Organopolysiloxane compositions curable into elastomeric state even in the absence of atmospheric moisture, notably in a confined environment, and well adopted for the production of seals, include a ketiminoxy crosslinking agent and a natural or synthetic hydrogel hardening agent.

Abstract: A medium for electrophoresis comprising an aqueous acrylamide gel formed by crosslinking polymerization of an acrylamide compound and an acrylamide copolymer having at least one specifically selected constitutional repeating unit in the presence of water. The medium may contain a water-soluble polymer and agarose. The medium may contain a modifier such as an anionic surfactant or a compound having at least one carbamoyl group.

Abstract: A starch-based alkaline curing adhesive is disclosed. The adhesive, when employed in the preparation of corrugated paperboard provides the paperboard with superior water resistant bonds. The adhesive contains from about 6 to 35%, based on total weight of the adhesive, solids basis, of a latex polymer of a halohydrin quaternary ammonium monomer.

Abstract: An electrophoretic gel which, when used in an electrophoretic process for the separating chylomicrons, beta lipoproteins, pre-beta lipoproteins, and alpha lipoproteins, enables the separation of the alpha lipoprotein band from the faster moving free fatty acid albumin band. The electrophoretic gel comprises a matrix selected from the group consisting of polysaccharides and derivatives thereof, a buffer having a buffering capacity in an alkaline pH range, and an effective amount of a poly(oxyethylene)-poly(oxypropylene)-poly(oxyethylene) block copolymer.An improved electrophoretic technique characterized in that the above electrophoretic gel is employed therein.

Abstract: Powder of chemical material for impression taking and molding for teeth is previously packed with a water-soluble film in an amount determined by each clinical treatment. A desired impression taking or molding material is obtained by putting such pack or packs in a proper amount of water and properly kneading them.

Abstract: The invention relates to a new process for producing titanium IV and zirconium IV pyrophosphates, certain of which are new compounds, and their uses. The pyrophosphates are prepared by reacting a metal tetraester with phosphorus pentoxide, with or without the addition of an hydroxyl compound, such as an alcohol or a phenol. Depending on the molar ratio of the components, the compounds produced may contain cyclic or straight chain pyrophosphate groups and alkoxy groups attached to the metallic ion. In addition to forming new compounds, the process of the invention produces the desired products without difficult-to-separate by-products.

Abstract: Powdered alginate compositions containing polyacrylamide in an amount from about 0.01 to about 0.25 wt. % and having a particle size less than about 300 mesh have enhanced smoothness characteristics, without visible signs of undissolved polymer, upon admixing with water to obtain orally settable, dental impression material.

Abstract: An enhanced water-absorbency hydrophilic polymer material, suitable for use in for example wound dressings, is prepared by a process in which a water-containing organic hydrogel comprising a gelable polysaccharide and/or protein or polypeptide interspersed with a polymer of a hydrophilic acrylic or methacrylic acid derivative is permeated with a base, the pH of said hydrogel being raised to at least 9 during treatment with said base.

Abstract: A stencil printing ink is described, comprising 0.5 to 20% by weight pigment, 5 to 30% by weight extender pigment, 0.5 to 5% by weight water-soluble polymer (the viscosity of its 10% aqueous solution is at least 40 cps), 3 to 15% by weight (calculated as solids) o/w type resin emulsion, 5 to 20% by weight polyhydric alcohol and water. This ink can produce printed images without being affected by printing conditions such as temperature and application pressure. Thus, it is suitably used in stencil printing for non-professional or unskilled people.

Abstract: Compositions and methods are provided for forming a coated wood product having the appearance and texture of wood grain, which conceals joints on the wood surface and which is capable of accepting conventional wood stain.

Abstract: A low dusting powdery alginate impression material for dental use is disclosed which comprises:(a) an alginate,(b) a gelling agent,(c) a gelation controlling agent,(d) a filler,(e) at least one hydrophobic liquid having a vapor pressure of not higher than 3.15 mmHg at 20.degree. C. selected from the group consisting of a hydrocarbon and a silicone oil not containing a hydrophilic group,(f) polyvinylpyrrolidone, and(g) at least one compound selected from the group consisting of oxides, hydroxides and fluorides of metals.With the alginate impression material, gypsum models prepared using the negative mold of an impression have high surface precision and impressions of oral cavity having high precision can be obtained as well as substantially no dust formation is observed when taken out of a storage container and during mixing with water.

Abstract: Treated glass fibers having improved utilization of silane coupling agents are produced which have good strand handling and processing properties and which result in reinforced polymeric materials having good strength properties and good UV color stability. The treated glass fibers having an aqueous treating composition present on a substantial portion of the surface of the glass fibers, wherein the aqueous chemical treating composition has an aqueous dispersion of an internally silylated polyurethane polymer having siliconate anions and one or more dispersing agents in at least an effective dispersing amount, and water in an amount to give a total solids for the aqueous chemical composition for treatment of the glass fibers. The one or more dispersing agents, can be present as external dispersing agents in which case their amounts could be both an effective dispersing amount and an effective lubricating amount.

Abstract: A denture fixative composition contains as the active fixative a partially neutralized and crosslinked polyacrylic acid or a precursor combination of the polyacrylic acid, neutralizing agent(s) and crosslinking agent(s) which is adapted to form the active fixative, and at least one hydrophilic polymer, preferably, sodium carboxymethyl cellulose, hydroxypropyl guar or sodium alginate.

Abstract: Water-resistant articles such as automobile surfaces are protected against soiling from asphalt undercoating, paint overspray and the like, by applying a pre-coat film of polymer that is readily flushed off with water after the soiling exposure is terminated. Pre-coat is preferably applied from aqueous dispersion and has sufficient levelling agent content to keep it from separating into droplets when applied on a heavily waxed surface. Fluorinated surfactants, by themselves or mixed with silicone surfactants, are effective levelling agents. Alginate and half-acid half-amide 3-dimethylaminopropylamine-reacted ethylene-maleic anhydride polymers are very good film-formers, although others can be used. The film-formers are preferably heavily plasticized with glycerine or other water-soluble plasticizer.

Abstract: Powdered alginate compositions formulated with a polymer comprising polyacrylamide have enhanced smoothness characteristics upon admixing with water to obtain orally settable, dental impression material.

Abstract: The formation of novel water soluble and water insoluble gels by interpolymer reactions of selective anionic polymers with selective cationic polymers in an aqueous medium, with either polymer serving as a cross-linking agent under specific conditions of speed and concentration. The selective cationic polymer is a quaternized ammonium polyelectrolyte selected from the group consisting of poly (diallyldimethylammonium chloride), poly (diallyldimethylammonium chloride-co-acrylamide), and a quaternary ammonium cellulose ether polymer. The anionic polymer is selected from the group consisting of a polysulfonic acid and alginic acid. The formation of the gel structure depends on fast and intensive interaction of the two opposite charges to insure a maximum amount of ion pair formation. The solubility of the gel depends on the formation of intimate or loose ion pairs; which depends on the charge density and structure of the polyelectrolytes. These interpolymer gels exhibit a dramatic increase in viscosity.

Abstract: Water-soluble polymers are rapidly dissolved in water by dispersing finely divided particles of the polymer into a liquid carrier in which the polymer is insoluble to form a suspension. The suspension is then added to water in order to release the polymer into the water as discrete particles that rapidly dissolve. The polymer particles are preferably prepared by cryogenic grinding, or another non-molecularly destructive process.

Abstract: An oral, settable, dental composition is prepared by interacting Component A containing an alkali metal alginate in an aqueous paste with Component B containing a divalent metal salt such as calcium sulfate and a reaction rate retarder such as tetrasodium pyrophosphate in a fluid plasticizer paste that is substantially free of unbound water. A non-grainy, smooth texture of the pre-set, blended components is obtained by incorporating into Component A a polymer comprising polyacrylamide.

Abstract: This invention is relevant to a method for saving fuel in heating plants which utilize thermal energy obtained through combustion of fuel in a boiler and in which the heat transfer medium is circulating water, said method consisting of mixing the circulating water with aqueous solution or homogeneous dispersion of a salified polymeric substance selected from amongst polymers and copolymers of acrylic or methacrylic acid, carboxymethylcellulose, alginates.

Abstract: A water borne wood stain resistant to pigment settling prior to use. A preferred formulation contains the following components in approximate parts by weight:______________________________________ Component Amount ______________________________________ Film forming resin 5-8 Pigment 5-15 Water thickener 0.5-2 Water 89.

Abstract: A novel blend of two components: one a blend of algin and tamarind; and the other, a polycationic electroconductive polymer is disclosed, which is used as a paper coating composition. The paper coated above improvement in film-forming, reduction in air porosity, and an increase in oil and solvent holdout.

Abstract: Particles of active substance each comprising a core of a high molecular substance containing an aldehyde group and a coat applied to the aforementioned core and formed of the reaction product of the aforementioned aldehyde group-containing high molecular substance with a high molecular substance containing active hydrogen, which particles are manufactured by causing particles of the aforementioned aldehyde group-containing high molecular substance to assume a swelled state and allowing the swelled particles to be reacted upon by the aqueous solution of the aforementioned active hydrogen-containing high molecular substance.

Abstract: Texturized wall coverings comprising inexpensive materials such as paper pulp fibers, textile linters, and cotton threads can be made water resistant by the incorporation therein of a blend of tamarind gum, algin, and, optionally, guar gum.