Abstract: A process is provided for treating mineral hydraulically or non-hydraulically setting coating agent and binder compositions using water-redispersible powders wherein one or more organopolymer powders and one or more organosilicon powders are added to the dry coating agent and binder composition.

Abstract: Biomedical devices with stable, hydrophilic and antimicrobial coatings are provided. The coatings are formed using a coupling agent to bond a carboxyl containing hydrophilic coating to the surface by ester or amide linkages.

Abstract: A thermosetting powder paint composition comprising:(A) a (meth)acrylic copolymer having glycidyl groups;(B) a polybasic carboxylic acid and/or polybasic carboxylic anhydride; and(C) particles having a core/shell structure each comprising a core having Tg of 20.degree. C. or below, the core being covered at least partially with a shell having Tg of 40.degree. C. or above, and said shell having no glycidyl group.The paint composition is excellent in weather resistance as well as in impact resistance and chipping resistance.

Abstract: An antimicrobial caries-detecting composition, which comprises(i) water, a water-miscible solvent or a combination thereof, (ii) a dye capable of staining the caries-infected portions of teeth, and (iii) at least one antimicrobial agent.

Abstract: A method is provided for preparing the surface of a cyanate ester resin composite for metal plating. More particularly, a layer consisting essentially of cyanate ester resin is applied to the surface of the composite. Thereafter, the surface of the resin layer is etched, preferably by treatment with an etching solution containing either a quaternary ammonium hydroxide or a primary amine. Upon completion of the etching process, the cyanate ester resin layer may be successfully plated with metal. The method of the invention operates to improve adhesion between the cyanate ester resin composite and a subsequently-plated metal by providing the composite with a homogenous distribution of mechanical anchoring sites for a subsequently-plated metal, such that uniformity of adhesion is achieved.

Abstract: Titanium dioxide particles are dispersed in an aqueous medium with a polymeric latex which adsorbs to the surface of the titanium dioxide to give a low-viscosity slurry or pigment grind of composite titanium dioxide-polymeric latex particles. A high glass transition polymeric latex can be used as the dispersant, and a low glass transition temperature binder latex can be added. The zeta potential of the polymeric latex can be at least about 30 millivolts more negative than the zeta potential of the titanium dioxide. The adsorbed polymeric latex provides more optimal spacing of the titanium dioxide particles in films formed from coating compositions formulated using the composite particles, and consequently greater film opacity and hiding at a given pigment volume concentration.

Abstract: The molding composition contains, in a flowable binder, from 20 to 50% by vol., based on the total volume of the molding composition, of a powder comprising one or more metal oxides and, if desired, metal carbides and/or metal nitrides which cannot be reduced using hydrogen, where at least 65% by vol. of the powder has a maximum particle size of 0.5 .mu.m and the remainder of the powder has a maximum particle size of 1 .mu.m, and at least 90% by vol. of the powder comprises metal oxides which can be reduced using hydrogen. The metal oxides which can be reduced using hydrogen are Fe.sub.2 O.sub.3, FeO, Fe.sub.3 O.sub.4, NiO, CoO, Co.sub.3 O.sub.4, CuO, Cu.sub.2 O, Ag.sub.2 O, Bi.sub.2 O.sub.3, WO.sub.3, MoO.sub.3, SnO, SnO.sub.2, CdO, PbO, Pb.sub.3 O.sub.4, PbO.sub.2 or Cr.sub.2 O.sub.3, or mixtures thereof.

Abstract: A multiple component material, in particular a filler particle containing implantation material is produced and used to anchor prothesis components in bones, to strengthen bones, as dowel for bone screws and as implants for anchoring screws. The polymer component of the disclosed implantation material is preferably based on an acrylate or polymethacrylate basis, or on an acrylate and methacrylate copolymer or a mixture thereof. The polymer component encloses the filler particles at least in part. Preferably, the filler particles are 5 to 15 .mu.m in size and have at least 50% void volume. The multiple component material is stored in a dry, stable particulate form ready for use by mixing with monomer liquid.

Abstract: In accordance with the present invention there is provided a method for making a highly radiopaque polyolefin compound, wherein the radiopaque material in said compound is substantially uniformly dispersed and held within a polymer matrix. During the method one first heats an amount of polyolefin, preferably low density polyethylene, to at least its melting temperature. The amount of polyolefin is equal to at least 10% by weight of the compound. Then an amount of radiopaque metal powder is added to the polyolefin. The amount of radiopaque metal is equal to up to 90% by weight of the compound. The metal powder is preferably tantalum, tungsten, gold or platinum. Thereafter, an amount of a dispersing agent is added to the polyolefin to form a mixture. The amount of dispersing agent is equal to at least 0.2% by weight of the compound. The dispersing agent is preferably zinc stearate, aluminum stearate or calcium stearate. Lastly, the mixture is mixed and cooled below its melting temperature to form the compound.

Abstract: A process involving (a) homogeneously dispersing tris(2-aminoethyl) amine in a recycled rubber having an individual particle size no greater than 420 microns, (b) mixing the treated recycled rubber with unvulcanized rubber and (c) vulcanizing the rubber mixture.

Abstract: The present invention provides semi-spherical materials to be worn on the eyeball, such as contact lenses for visual acuity correction or medical treatment use, cornea protecting materials, controlled drug release contact lenses and the like, which comprise, as a main component, a glycosaminoglycan existing in the living body as an extracellular matrix component of connective tissues and satisfy various requirements such as dimentional stability, transparency, surface water wettability, tissue compatibility, oxygen permeability and the like. In other words, the material to be worn on the eyeball has a shape of semi-spherical surface compatible in shape with the mammalian eyeball and has biological and surface-physical compatibilities with ophthalmic tissues and comprises, as a main component, a substantially transparent photocured crosslinked-glycosaminoglycan obtained by allowing photoreactive groups covalently bonded to a glycosaminoglycan to crosslink mutually by photoirradiation.

Abstract: In a method for producing a cement for medical use, a liquid component containing a polymerizable substance is combined with a solid component comprising a plastic substance to provide a setting mass to form the cement. In order to e.g. improve the biological and mechanical properties of the cement and allow it to be mixed by modern mixing procedures, which further improves the cement quality, said plastic substance is mixed with a particulate crystalline ceramic material prior to combining said liquid and solid components. A cement for medical use is also defined as is the use of set cement as an anchorage for the fixation of prostheses or parts of prostheses or bone and as a substitute material for bone.

Abstract: The invention relates to dental compositions, containing(a) 5 to 70 wt. %, based on (a)+(b)+(d), of polymerizable monomers and/or polymers,(b) 0 to 95 wt. %, based on (a)+(b)+(d), of fillers,(c) 1.0 to 15 wt. %, based on (a), of at least one initiator or one initiator system,(d) 0 to 95 wt. %, based on (a)+(b)+(d), of the usual auxiliaries, including pigments, radiopaque additives and/or thixotropy aids,characterized in that constituent (a) has a chemical structure such that partial or final curing of the dental composition can be effected by ring-opening metathesis polymerization.The dental compositions are characterized by a rapid polymerization process, leading to partially or fully cured materials, which display little volume shrinkage, little abrasion tendency and good mechanical properties.

Abstract: Systems, apparatus combinations and methods for producing a coating powder are provided wherein a stream of a powder coating precursor including at least one resin and at least one additional powder coating ingredient is contacted with a process fluid effective to reduce the viscosity of the powder coating precursor to allow processing of the powder coating precursor at a lower temperature.

Abstract: Rubbery polymers in hydrocarbon solutions are emulsified in aqueous liquids and converted to latices by partitioning the emulsion through a membrane of selective permeability to the hydrocarbon solvent relative to both water and the polymer, thereby removing the hydrocarbon solvent from the emulsion. The foaming that is often associated with removing hydrocarbon solvent from aqueous emulsions by conventional means is thus avoided. Membrane partitioning mechanisms that are useful for this application include those involving both nonporous and microporous membranes, those passing the solvent both as a liquid and as a gas, those drawing off the permeate as both a liquid and a gas, and various combinations of these methods.

Abstract: A bioerodible polymeric semi-IPN alloy which comprises a first bioerodible polymer capable of producing acidic products upon hydrolytic degradation; a second bioerodible polymer, which provides a biopolymeric scaffolding or internal reinforcement; and optionally a buffering compound that buffers the acidic products within a desired pH range. In a preferred embodiment, the second bioerodible polymer comprises polypropylene fumarate (PPF), which is cross-linked, desirably by a vinyl monomer such as vinyl pyrrolidone (VP) to form the biopolymeric scaffolding which provides the semi-IPN with dimensional and geometric stability.

Abstract: A curable dental adhesive composition of the type including polymerizable monomer and polymerization initiator may be easily prepared and applied to a tooth surface by using a tool which includes fibrous or sponge material, adapted to fit within a person's mouth, and carrying at least part of the polymerization initiator. Polymerizable monomer and any remaining polymerization initiator as well as filler and other ingredients may be brought into contact with the tool to form the curable composition just prior to applying the composition to the tooth surface. The tool may be part of a kit which also includes a container for polymerizable monomer and, as necessary, one or more additional containers for remaining polymerization initiator(s), fillers, etc. No separate mixing container is required.

Abstract: A practically non-aqueous dental cement composition is disclosed and the dental cement composition comprises a polymer or co-polymer having an .alpha.,.beta.-unsaturated carboxylic acid as an essential component of a main monomer; and an inorganic powder capable of forming a metal chelate in the presence of water characterized in that the polymer or co-polymer exists as a solution in a polymerizable monomer that can dissolve the polymer or co-polymer. This provides a dental composition which has not only the advantages of the conventional glass ionomer cement but also a higher setting rate and more desirable physical properties of the setting product and is excellent also in durability, by eliminating the disadvantages in the setting rate and physical properties of the set cement.

Abstract: The invention relates to the use of special vanadium compounds as siccatives for oxidatively drying lacquers. These drying agents (siccatives) are ionogenic in nature and contain polyvalent cations of vanadium or vanadium oxide and anionic organic acid groups or other organic anions.

Abstract: A puncture sealing agent for sealing an inner surface of a tire comprises a deproteinized rubber latex that is formed by removing protein from a natural rubber latex. The puncture sealing agent includes nitrogen content at 0.1 wt. % or less of rubber solid content of the deproteinized rubber latex, and ammonia content at 0.5 wt. % or less of the rubber solid content.