Abstract: The present invention relates to novel polyether polyols containing pendant amine group and to a process for their preparation. These polyether polyols have molecular weights of from about 105 to about 35,000, and contain at least one terminal hydroxyl group and at least one pendant amine group. The process for their preparation comprises reacting a compound containing from 1 to 10 hydroxyl groups and a molecular weight of about 32 to about 15,000 with at least one epoxide which contains one or more halogen atoms, in the presence of one or more DMC catalysts, to form an intermediate polyether polyol which contains halogenated carbon atoms; then reacting this intermediate polyether polyol with an amine group containing compound having from 1 to 3 primary, secondary and/or tertiary amine groups.

Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate diols by transesterifying dimethyl carbonate (DMC) with aliphatic diols.

Abstract: The invention describes a composite component based on a sandwich structure, composed of: (a) at least two outer layers which independently of each other comprised at least one film, sheet, fiber mat and/or foam made from metal, plastic, glass, natural material and/or carbon, and (b) a core positioned between the outer layers, made from metal, plastic, natural material and/or paper having a large number of cavities, in which a casting resin system at least partially penetrates the outer layers and the core and the outer layers are bonded to the core by press molding. The composite component is characterised in that in at least one area of the sandwich structure the outer layers are pressed together and the compressed area of the sandwich structure is encapsulated with thermoplastic polymer. Composite base on a sandwich structure are obtained by encapsulating at least one area of the two outer layers. The encapsulating area is that area of the two outer layers have been pressed together.

Abstract: This invention relates to stable liquid biuret modified toluene diisocyanates, prepolymers thereof, stable liquid biuret allophanate modified toluene diisocyanates, prepolymers thereof, and to processes for the preparation of these compositions. The stable liquid biuret modified toluene diisocyanates comprise a secondary amine based biuret modified TDI having an NCO group content of about 12 to about 46% by weight.

Abstract: The invention relates to an improved process for the production of isocyanates by the reaction of an amine or a mixture of two or more amines with phosgene, the improvement involving the phosgene containing less than about 100 ppm of sulfur in elemental or bound form. The inventive process yields light-colored isocyanates that are suitable for the production of polyurethanes or their precursors (e.g. prepolymers) without the treatment processes heretofore required.

Abstract: The invention concerns hydrous compositions based on polychloroprene and hydroxylamine derivatives, processes for their production and their use as adhesives. The polychloroprene dispersions are stabilized by the addition of hydroxyalkylamine after removal of residual monomer.

Abstract: Alkaline waste waters formed in the washing of crude nitrobenzene which has been prepared by the adiabatic nitration of benzene with nitrating acid, washed in an acidic washing process, and then washed in an alkaline washing process are treated. The alkaline waste water being treated generally contains benzene in a concentration of from about 100 to about 3000 ppm and nitrobenzene in a concentration of from about 1000 to about 10,000 ppm. In the process of the present invention, undissolved benzene and/or nitrobenzene are separated from the alkaline waste water, residual benzene and/or nitrobenzene is/are then optionally stripped out of the alkaline waste water, and the alkaline waste water from which benzene and/or nitrobenzene has been removed is heated to a temperature of from 150 to 500° C. under excess pressure with the exclusion of oxygen.

Abstract: Nitrobenzene is produced and then purified using an acidic wash, an alkaline wash, a neutral wash, subjecting a dispersion formed in the neutral wash to electrophoresis to separate water and benzene from the nitrobenzene and recover purified nitrobenzene.

Abstract: The present invention provides a process for the double metal cyanide (DMC)-catalyzed production of low unsaturation polyethers from boron-containing starters. The polyethers produced by the inventive process may be reacted with one or more isocyanates to provide polyurethane products including coatings, adhesives, sealants, elastomers, foams and the like. The inventive process may be used to prepare fuel additives from C9-C30 boron-containing polyethers, more particularly from C13 alcohols.

Abstract: The invention describes a stirring device made from a gassing stirrer and a liquid mixer or two liquid mixers, which are arranged on a shaft and each have a feed and at least one exit opening, wherein the exit openings of the gassing stirrer and of the liquid mixer or the liquid mixers are at a distance from one another, the ratio, a/d, of the distance, a, between the exit openings to the diameter, d, of the gassing stirrer or liquid mixer being 0.02 to 0.5 and the ratio, b/d, of the distance, b, between the outer edges to the diameter, d, of the gassing stirrer or liquid mixer being 0.01 to 0.4.

Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate polyols by transesterifying dimethyl carbonate (DMC) with an aliphatic polyol component.

Abstract: The present invention relates to a process for the production of mixtures of di- and polyamines of the diphenylmethane series (MDA) containing less than 1,000 ppm of water and less than 200 ppm of aniline by reaction of aniline and formaldehyde in the presence of acid catalysts and subsequent separation of the acid catalyst and subsequent distillative separation of water and aniline in an at least a two-stage distillation including a flash evaporation and subsequent cooling.

Abstract: Toluenediamine is produced and separated from by-products of the reaction by: a) hydrogenating dinitrotoluene in the presence of a catalyst, b) separating the catalyst, water and optionally solvent from the hydrogenation reaction mixture to give crude toluenediamine, and c) separating by distillation the crude toluenediamine in a separating wall column into at least four product streams P1, P2, P3 and P4. The product stream P1 is a stream containing low boilers. The product stream P2 is a stream containing o-toluenediamine. The product stream P3 is a stream containing m-toluenediamine. The product stream P4 is a stream containing high boilers and m-toluenediamine.

Abstract: The present invention relates to polyol compositions which can be used to produce dimensionally stable, low density water-blown rigid foams which have acceptable compressive strengths and acceptable k-factors. In one embodiment of the present invention, the polyol compositions are composed of at least one aromatic amine-initiated polyether polyol and at least one polyether polyol having a functionality greater than or equal to 2.5 in which at least 50% by weight of the polyol composition is aromatic amine-initiated polyether polyol and in which no more than 50% by weight of the polyol composition is polyether polyol having a functionality greater than or equal to 2.5.

Abstract: The invention relates to a process for the production of sandwich elements (so-called panels), in which the rising reactive mixture is guided, when it rises, through guide elements arranged between the upper and lower outer layers. This process produces void-free panels having a regular cell structure. The invention also relates to an apparatus useful for the production of such sandwich elements.

Abstract: The present invention is directed to a process for the manufacture of three-dimensional acoustically sound automotive insulation parts. In particular, the process includes mixing a two component polyurethane resin, applying the resin to a substrate, molding the substrate and then trimming and demolding the resin applied substrate.

Abstract: The present invention relates to a process for the continuous production of polyurethane sandwich elements comprising an upper outer layer and a lower outer layer and a layer of cellular polyurethane lying in between, which is firmly bonded to the outer layers. This invention also relates to an apparatus suitable for the production of polyurethane sandwich elements as described above.

Abstract: The present invention relates to novel aspartates, their method of production and the use of these mono and polyaspartates as reactive components for polyisocyanates in two-component polyurethane coating compositions and for preparing polyurethane prepolymers.

Abstract: The invention provides composite elements containing a thermoplastic polymer layer, adhering to a layer comprising the reaction product of a reaction mixture containing a prepolymer containing isocyanate groups produced by the reaction of at least one isocyanate and one polycarbonate polyalcohol with a functionality of 2 to 3 and a hydroxyl number of about 40 to about 400 mg KOH/g, based on the condensation of carbonates with diols and/or triols with a molecular weight of about 62 to about 3000 g/mol, the prepolymer having an isocyanate group content of about 5 to about 48%, compounds reactive with respect to isocyanates and optionally catalysts blowing agents and/or auxiliary substances and/or additives. The present invention further provides a process for the production the composite elements.

Abstract: The present invention provides a catalyst containing titanium in bonded form, non-crystalline silicon dioxide and at least one crystalline silicate phase which has a zeolite structure, wherein the non-crystalline silicon dioxide is applied to at least one of the crystalline silicate phases which have a zeolite structure and wherein at least one of the crystalline silicate phases which have a zeolite structure contains silicon-carbon bonds with which non-hydrolytically separable organic groups R are bonded to silicon. Furthermore, the present invention provides a process for preparing this catalyst and a process for producing an epoxide from a compound which contains a carbon-carbon double bond (preferably from propene) comprising reacting the compound which contains a carbon-carbon double bond with hydrogen peroxide in the presence of the catalyst according to the invention.