Abstract: A device for influencing an exhaust gas flow, in particular for controlling the sound emission in an exhaust branch of an engine, includes a closure member that is movably arranged in the exhaust gas flow. For example, the closure member comprises a flap driven by a motor to move the closure member in the exhaust gas flow. It is thus optionally possible to produce or influence pressure pulsations in the exhaust gas which lead to an audible sound emission. The device according to the invention provides for a so-called “sound design” of a combustion engine. The driving device (the drive motor and a force transmission member to the closure member) is equipped with an active cooling system.

Abstract: An adsorption element for adsorbing gases and vapors from the gaseous atmosphere in the intake tract of an internal combustion engine. The adsorption element is disposed within a wall of a flow cross section carrying the intake air, has a planar adsorption medium along which the intake air flows, and is pleated to create folds in longitudinal direction of the intake stream.

Abstract: The present invention relates to water-dispersible plastics precursors which are solid at temperatures below about 40.degree. C. The plastics precursors are based on isocyanate-terminated prepolymers which have been hydrophilically modified with ionic groups and/or ethylene oxide units and which contain specified amounts of isocyanate groups and --NH-- groups.The present invention also relates to processes for preparing aqueous dispersions from the solid plastics precursors and to using the plastics precursors for cross-linking dispersed plastics containing isocyanate-reactive groups.

Abstract: The invention relates to aqueous adhesives which are based on water-dispersible polymers and which contain water-dispersible polyisocyanate preparations having an average NCO-functionality of at least 2.2, which, in addition to an aromatic polyisocyanate or a mixture of aromatic polyisocyanates, contain a quantity of emulsifier sufficient to guarantee the dispersibility of the polyisocyanates, as additives capable of improving the bonding properties of these adhesives.

Abstract: The present invention relates to the use of soluble electrolytes as additive to aqueous dispersions of self-dispersible anionically and/or nonionically hydrophilically modified synthetic materials for the purpose of improving the water resistance and/or blocking resistance of sheet products produced from the dispersions.

Abstract: The present invention relates to aqueous dispersions or solutions of oligomers or polymers, polycondensates or polyaddition products containing from about 2 to 200 milliequivalents per 100 g of solids, of incorporated ammonium groups obtained by neutralizing incorporated tertiary nitrogen atoms with organic acids, characterized in that the organic acids on which the ammonium groups are based are acids which lose their acid character at temperatures in the range from about 20.degree. to 200.degree. C. in the absence of water without releasing corrosive decomposition products. The present invention further relates to a process for the production of these novel aqueous dispersions or solutions and to their use.

Abstract: A process is provided for preparing storage stable, aqueous dispersions of oligourethanes or polyurethanes in admixture with auxiliary agents and additives which are not soluble nor dispersible in water. The oligourethanes or polyurethanes are rendered dispersible in water by incorporating ionic and/or non-ionic hydrophilic groups. In order that the final product remains storage stable, the auxiliary agents or additives are added to the oligourethanes or polyurethanes before they are dispersed in water.

Abstract: This invention relates to a new process for the production of aqueous dispersions or solutions of polyurethane-polyureas by reacting NCO-prepolymers which have been hydrophilically modified and/or which contain external emulsifiers with organic polyamines and/or hydrazines in the aqueous phase, the above-mentioned chain extenders - in the form of their solid adducts with inorganic or organic acids - being mixed with the NCO-prepolymers to form a suspension before production of the dispersion or solution. The invention also relates to the dispersions or solutions obtainable by this process and to their use for the production of coatings or bonds.

Abstract: The present invention relates to a process for the preparation of polyurethane ureas from relatively high molecular weight polyols, diisocyanates, water as chain lengthening agent and optionally short chain glycols in a multishaft extruder equipped with kneading elements.

Abstract: The present invention relates to a process for the preparation of aqueous dispersions or solutions of isocyanate polyaddition products characterized in that oligourethanes(a) which have an average molecular weight of less than about 15,000,(b) which contain from about 0 to 120 milliequivalents, per 100 g of solid content, of built-in ionic groups and/or from about 0 to 25% by weight, based on the total weight of the oligourethane, of built-in ethylene oxide units --CH.sub.2 --CH.sub.

Abstract: The present invention relates to a process for the preparation of aqueous dispersions or solutions of polyurethanes which have urea end groups and contain non-ionic hydrophilic segments and which are capable of being cross-linked with the aid of cross-linking agents which are reactive with urea groups, characterized in that prepolymers which have isocyanurate end groups and which(i) have an average molecular weight of less than about 15,000 and(ii) contain from about 2 to 30%, by weight, of ethylene oxide units corresponding to the following formula:--CH.sub.2 --CH.sub.2 --O--within a polyether chain (containing ethylene oxide units)are reacted at from about 10.degree. to 70.degree. C.

Abstract: This invention relates to coating compositions based on aqueous polyurethane dispersions and to the use of these coating compositions for the production of top coats or finishes on PVC. The coating compositions according to the invention contain a mixture of two aqueous polyurethane dispersions which have particular chemico-physical properties.

Abstract: A process for preparing modified aqueous synthetic resin dispersions, comprising introducing organic diisocyanates which are liquid at room temperature into polyurethane-containing, non-sedimenting, aqueous synthetic resin dispersions, optionally in the presence of catalysts which accelerate the isocyanate polyaddition reaction and/or the dimerization of isocyanate groups and/or the carbodiimidization of isocyanate groups and/or the trimerization of isocyanate groups, mixing the organic diisocyanate with the aqueous dispersion at a temperature at which no visible foaming occurs, maintaining the temperature after addition of all the diisocyanate until at least 50% of the isocyanate groups in the added diisocyanate have undergone reaction and, if desired, completing the reaction by subsequently heating to temperatures up to 100.degree. C.These modified aqueous dispersions contain dispersed latex particles which are enveloped with polyurea formed from the diisocyanates.

Abstract: This invention relates to a process for the production of new, non-foamed urethane and/or urea group-containing polyisocyanate polyaddition products which contain both cationic and also anionic groups chemically bound into the same molecule of said polyisocyanate polyaddition products, to the polyaddition products obtainable by this process and to the use thereof for coating flexible and non-flexible sheet-form materials.

Abstract: The present invention is concerned with a process for preparing aqueous dispersions from solid polymer precursors which are polyester or polyurethane oligomers containing both hydrophilic centers and cross-linking sites and subsequently coating substrates with the thus obtained dispersions. The aqueous dispersion is applied to a substrate and dried with resultant cross-linking of the film.

Abstract: This invention relates to a process for the production of water dispersible polyurethanes by reacting polyisocyanates with sulphonate group containing diols. The sulphonate diols have the general formula: ##STR1## WHEREIN A and B, which may be the same or different, each represents a divalent aliphatic hydrocarbon group containing from 1 to 6 carbon atoms,R represents hydrogen, an aliphatic hydrocarbon group containing 1 to 4 carbon atoms or a phenyl group,X.sup.(+) represents an alkali metal cation or ammonium group which may be substitutedn and m, which may be the same or different, each represents an integer between 0 and 30 inclusive,o and p, represent 0 or 1, andq represents an integer of 0 or 2.Sufficient amounts of this diol are used to provide the final polymer with a sulphonate group content of about 0.1 to 6 wt.%. In a preferred embodiment, a prepolymer is formed in substance with the sulphonate bearing diol, the polyisocyanate and optionally other reactive hydrogen bearing compounds.

Abstract: This invention relates to a novel process for the production of polyurethane via an intermediate stage of aqueous dispersions of oligomeric polyurethane prepolymers having ionic and/or non-ionic hydrophilic groups which ensure their dispersibility in water, followed by conversion of these water-dispersible oligomers into cross-linked high molecular weight sheets.