Abstract: A film containing a polymer such as polyvinyl chloride is rapidly and reliably bonded to a molding containing a polymer, wood or aluminum using a hot-melt adhesive by thermally activating the film by heating using electromagnetic radiation.

Abstract: The invention relates to reactive polyurethane compositions that can be produced by reacting polyols with a stoichiometric excess of mixtures consisting of asymmetric polyisocyanates having a molecular weight of less than 600 and an NCO functionality ranging from 0.175 to 2.5 and high-molecular isocyanates. These reactive polyurethane compositions re suited for producing reactive hot-melt-type adhesives, solvent-free or solvent-containing laminating adhesives, assembly foams, casting compounds, soft/hard and integral foams and for producing reactive one-component or two-component adhesives/sealants.

Abstract: Reactive polyurethanes containing free isocyanate groups but low levels of monomeric asymmetrical diisocyanate may be obtained by reacting a monomeric asymmetrical diisocyanate such as diphenylmethane-2,4′-diisocyanate (2,4′-MDI) containing less than 5% 4,4′-MDI and 2,2′-MDI, the 2,2′-MDI content being under 0.4%, with a polyhydric alcohol such as a diol with a molecular weight of 60 g/mol to 2,000 g/mol. The ratio of isocyanate groups to hydroxyl groups may be a value of 1.05:1 to 2.0:1. The reactive polyurethanes can be used to produce one- and two-component adhesive and sealant products.

Abstract: A moisture-curing hot-melt-adhesive composition in granulate, tablet or powder form can be produced by

Abstract: A cleaning composition effective for removing reactive polyurethane hotmelts and reaction products thereof is presented containing (a) a non-volatile monohydroxy compound having a boiling point at normal pressure of greater than 140° C., a secondary monoamine, or mixtures thereof, and (b) a catalyst for the production of a polyurethane or a depolymerization catalyst selected from the group consisting of an alkali metal alcoholate, an alkaline earth metal alcoholate, an aluminum alcoholate, a tertiary amine and mixtures thereof. The cleaning composition removes both residues of the reactive uncrosslinked hotmelt and also adhering deposits of already reacted, crosslinked or cracked, infusible hotmelt.

Abstract: The invention relates to thermoplastic compositions that contain reactive isocyanate groups and that are suitable for use as desiccants for packaging moisture-sensitive goods, especially for polyurethane hotmelt adhesives that are cross-linked upon exposure to moisture. The compositions are formed by the reaction of hydroxy- or amino-containing polyols, including sugars, with an excess of polyisocyanates, and admixing the resulting product with polyurethane catalysts.

Abstract: A cleaning composition effective for removing reactive polyurethane hotmelts and reaction products thereof is presented containing (a) a non-volatile monohydroxy compound having a boiling point at normal pressure of greater than 140° C., a monoamine, or mixtures thereof, and (b) a catalyst for the production of a polyurethane or a depolymerization catalyst selected from the group consisting of an alkali metal alcoholate, an alkaline earth metal alcoholate, an aluminum alcoholate, a tertiary amine and mixtures thereof. The cleaning composition removes both residues of the reactive uncrosslinked hotmelt and also adhering deposits of already reacted, crosslinked or cracked, infusible hotmelt.

Abstract: The present invention relates to compositions comprising reaction products of a polyisocyanate with a polyester block copolymer and a process for the preparation thereof. These are suitable as a moisture-curing hot melt adhesive. The hot melt adhesive composition may optionally also comprise a reaction product of a polyisocyanate with a polyester polyol and/or a reaction product of a polyisocyanate with a polyether polyol.

Abstract: The invention relates to compositions containing conversion products of a polyisocyanate with a polyester-polyether copolymer and a method for producing the same. Said compositions are suitable as a humidity-hardening hot-melt-type adhesive. The hot-melt-type adhesive composition can optionally also contain a conversion product of a polyisocyanate with a polyesterpolyol and/or a conversion product of a polyisocyanate with a polyetherpolyol. Such polyurethane hot-melt-type adhesive compositions are provided with good creep property and interfacial bonding values on synthetic materials and very high solidity values.

Abstract: Hotmelt polyurethane adhesive compositions which are solid at room temperature and capable of being cured by moisture are obtained by combining the reaction product of a polyisocyanate and a low molecular weight polymer derived from ethylenically unsaturated monomers and containing active hydrogen groups such as hydroxyl with an isocyanate-containing polyurethane prepolymer derived from one or more polyols. The low molecular weight polymer component may, for example, be obtained by free radical polymerization of mixtures of unsaturated monocarboxylic acids, alkyl esters of unsaturated monocarboxylic acids, and/or hydroxyalkyl esters of unsaturated monocarboxylic acids.

Abstract: A method is provided whereby high brightness metaborate phosphors are made by milling the reactants in a saturated aqueous solution of magnesia and boric acid prior to firing. The method increases the homogeneity of the fired metaborate phosphor cake and reduces the tendency of the fired cake to stick to the firing boats.

Abstract: Reactive hotmelt adhesives based on liquid polyether polyols and/or polyester polyols and aromatic diols with at least one diisocyanate have a very low melt viscosity and high early strength. They are particularly suitable for the bonding of substrates of poor thermal conductivity, such as foams and nonwoven materials, and heat-sensitive substrates.

Abstract: The hotmelt adhesive according to the invention containsA) at least one polyurethane prepolymer ofa) at least one polyisocyanate, more particularly toluene diisocyanate and/or MDI,b) at least one polyalkylene glycol in a concentration of more than 10% by weight, based on the hotmelt adhesive as a whole, more particularly polypropylene glycol,c) at least one polyester glycol, preferably at least two polyester glycols with different glass transition temperatures andd) at least one chain extender andB) optionally additives, such ase) a resin, more particularly a hydrocarbon resin, andf) a stabilizer, more particularly toluene sulfonyl isocyanate.The hotmelt adhesive preferably has a melt viscosity of 4 to 100 Pa.cndot.s at 170.degree. C. The PU prepolymer has only one Tg in the DSC curve. The hotmelt adhesive is distinguished by high creep resistance and high early and ultimate strengths.

Abstract: The invention relates to polyurethane compositions with a low content of monomeric diisocyanates. Trifunctional isocyanates optionally reduced in their functionality to 3.0.+-.0.7 with a monofunctional terminator are preferably used for this purpose. In this way, the compositions contain considerably smaller quantities of readily volatile isocyanates. The compositions are suitable for use as reactive hotmelt adhesives, lamination adhesives, adhesive/sealing compounds, primers and for the production of foam plastics from non-reusable pressurized containers (aerosol cans). The low content of volatile monomeric diisocyanates enables the need for safety measures in the workplace to be significantly reduced, in addition to which the disposal of residues remaining in the containers is made considerably easier.

Abstract: The invention relates to the use of moisture-curing PU hotmelt adhesives as molding compounds for the production of moldings, the PU hotmelt adhesives having a melt viscosity of less than 100 Pa.multidot.s at the processing temperature of 70.degree. to 190.degree. C. To produce the moldings, the molding compound is melted at temperatures of 70.degree. to 200.degree. C., the melt is injected into closed molds under an excess pressure of 1 to 50 bar, the cooled moldings are removed from the mold after a short time and are then cured with atmospheric moisture. Economic and technical advantages include distinctly lower processing pressures, expense on machinery and tooling and firm adhesion to various substrates. The moldings are heat-resistant and adhere to various substrates. They are particularly suitable for the production of electrical components.

Abstract: An improved electrochemical detection cell comprising a palladium reference electrode.

Abstract: A europium activated strontium tetraborate UV emitting phosphor is disclosed having a weight composition of from about 34.72% to about 35.80 strontium %, from about 17.66% to about 17.78 boron %, from about 0.37% to about 1.86% europium, and the balance oxygen. The phosphor has essentially elongated prism-like particles with the europium relatively uniformly distributed throughout the balance of the phosphor and with the particle size distribution being characterized by the 50% size being in the range of from about 7 micrometers to about 12 micrometers as determined by Coulter Counter measurement and with less than about 12% by weight of the particles having a particle size of greater than about 16 micrometers as determined by Coulter Counter measurement. The process for making the phosphor is disclosed which involves forming a mixture of strontium carbonate and europium carbonate in an aqueous solution of boric acid at a temperature of at least about 70.degree. C. with the mole ratio of SrCO.sub.3 to H.sub.

Abstract: A europium activated strontium tetraborate UV emitting phosphor is disclosed having a weight composition of from about 34.72% to about 35.80 strontium %, from about 17.66% to about 17.78 boron %, from about 0.37% to about 1.86% europium, and the balance oxygen. The phosphor has essentially elongated prism-like particles with the europium relatively uniformly distributed throughout the balance of the phosphor and with the particle size distribution being characterized by the 50% size being in the range of from about 7 micrometers to about 12 micrometers as determined by Coulter Counter measurement and with less than about 12% by weight of the particles having a particle size of greater than about 16 micrometers as determined by Coulter Counter measurement. The process for making the phosphor is disclosed which involves forming a mixture of strontium oxide and europium carbonate in an aqueous solution of boric acid at a temperature of at least about 70.degree. C. with the mole ratio of SrCO.sub.3 to H.sub.3 BO.

Abstract: A process is disclosed for producing a europium activated strontium borate phosphor having a strontium containing coating. The process involves washing a europium activated strontium borate phosphor with a solution of strontium hydroxide to produce a first washed phosphor followed by removing the first washed phosphor from the resulting wash solution. The first washed phosphor is washed with a wash solution selected from the group consisting of ammonium fluoride in alcohol, ammonium bifluoride in alcohol, and a strontium salt in ammonium hydroxide, followed by removing the resulting second washed phosphor from the resulting wash solution. The second washed phosphor is then heated to produce the coated phosphor.