Abstract: Described herein are processes for producing moldings comprising oxazolidinone groups, where polyisocyanate (a) is mixed with at least one organic compound (b) having two or more epoxide groups, at least one catalyst (c) for the isocyanate/epoxide reaction, and optionally auxiliary and additive materials (d) to form a reaction mixture, which is introduced into or applied to a mold and reacted to give moldings including oxazolidinone groups, where the catalyst (c) for the isocyanate/epoxide reaction includes a compound of the general formula [M(R1)(R2)(R3)(R4)]+ [X In]?, where M is a nitrogen atom or a phosphorus atom, R1, R2, R3 and R4 are an organic radical, X is fluorine, chlorine, bromine or iodine, I is iodine, and n stands for rational numbers from 0.1 to 10.

Abstract: The invention relates to polyurethanes obtainable by reaction of (a) polyisocyanates A selected from modified or unmodified 4,4?-methanediphenyl diisocyanate, higher nuclear homologs of 4,4?-methanediphenyl diisocyanate, isocyanated groups containing prepolymers based on 4,4?-methanediphenyl diisocyanate, and mixtures thereof, with (b) compounds having at least two isocyanate-reactive hydrogen atoms, comprising (b1) block copolymers formed from a polybutadienol and a cyclic ester as component B1, and (b2) low molecular weight extenders or crosslinkers each having a molecular weight of 62 to 500 g/mol as component B2.

Abstract: Described herein are processes for producing moldings comprising oxazolidinone groups, where polyisocyanate (a) is mixed with at least one organic compound (b) having two or more epoxide groups, at least one catalyst (c) for the isocyanate/epoxide reaction, and optionally auxiliary and additive materials (d) to form a reaction mixture, which is introduced into or applied to a mold and reacted to give moldings including oxazolidinone groups, where the catalyst (c) for the isocyanate/epoxide reaction includes a compound of the general formula [M(R1)(R2)(R3)(R4)]+ [X In]?, where M is a nitrogen atom or a phosphorus atom, R1, R2, R3 and R4 are an organic radical, X is fluorine, chlorine, bromine or iodine, I is iodine, and n stands for rational numbers from 0.1 to 10.

Abstract: The invention relates to a process for the production of polybutadienols from polybutadienes with number-average molar mass from 300 to 2000 g/mol comprising from 20 to 50% of 1,4 double bonds and from 50 to 80% of 1,2 vinylic and 1,2 cyclovinylic double bonds, based on the quantity of all of the double bonds, comprising the steps of i) epoxidation of some or all of the 1,4 double bonds with an epoxidizing reagent which selectively epoxidizes 1,4 double bonds, ii) reaction of the epoxidized polybutadiene with an alcohol or water to give a polybutadienol.

Abstract: The invention relates to polyurethanes obtainable by reaction of (a) polyisocyanates A selected from modified or unmodified 4,4?-methanediphenyl diisocyanate, higher nuclear homologs of 4,4?-methanediphenyl diisocyanate, isocyanated groups containing prepolymers based on 4,4?methandiphenyl diisocyanate, and mixtures thereof, with (b) compounds having at least two isocyanate-reactive hydrogen atoms, comprising (b1) block copolymers formed from a polybutadienol and a cyclic ester as component B1, and (b2) low molecular weight extenders or crosslinkers each having a molecular weight of 62 to 500 g/mol as component B2.

Abstract: The invention relates to a process for preparing a zinc dicarboxylate from a zinc compound and a C4-C10 dicarboxylic acid in the presence of a cationic emulsifier and a solvent. The invention also relates to zinc dicarboxylates obtainable by the abovementioned process and having a BET surface area of 50 to 750 m2/g.

Abstract: A thermoplastic copolymer prepared from acrylonitrile and para-alpha-dimethylstyrene via bulk or solution polymerization has an improved heat distortion temperature and can be used together with graft copolymers and further components for the preparation of thermoplastic moldings.

Abstract: The invention relates to metal nanoparticles and a process for the preparation thereof, in which a metal salt solution is reduced with a reducing agent in the presence of the derivatized polyethyleneimines or polyvinylamines. Metal salt solutions of two or more different metals can be reduced simultaneously or in succession, metal nanoparticles comprising two or more different metals being obtained. Preferred metals are silver, palladium, and platinum. Suitable reducing agents are, for example, formic acid, formaldehyde, diethanolamine, 5-pentenoic acid and sodium borohydride. Silver can be used in the form of silver oxide and/or silver nitrate, palladium in the form of alkali metal tetrachloropalladate or palladium(II) nitrate and platinum in the form of alkali metal tetrachloroplatinate or tetraamineplatinum(II) nitrate.

Abstract: A thermoplastic copolymer prepared from acrylonitrile and para-alpha-dimethylstyrene via bulk or solution polymerization has an improved heat distortion temperature and can be used together with graft copolymers and further components for the preparation of thermoplastic moldings.

Abstract: The present invention relates to a process for preparation of polycarbonates with weight-average molar mass MW?230,000 g/mol and with ?2% by weight content of cyclic compounds, including the following steps: (a) reaction of at least one oxirane with carbon dioxide in the presence of a metal-polycarboxylic acid compound in an aprotic, non-water-miscible solvent at a temperature of from 40 to 120° C. and at a pressure of from 1 to 100 bar, where the molar ratio of monomer to metal-polycarboxylic acid compound is ?75, (b) addition of an aqueous solution of an inorganic acid to the reaction mixture once the reaction has ended, (c) removal of the aqueous phase, (d) if appropriate, washing of the remaining organic phase with water, and (e) devolatilization and drying of the resultant slurry of the polycarbonate in the aprotic, non-water-miscible solvent, and to the polycarbonate prepared via the process, and also to the use of the polycarbonate.

Abstract: The present invention relates to a process for preparation of polycarbonates with weight-average molar mass MW?230 000 g/mol and with ?2% by weight content of cyclic compounds, including the following steps: (a) reaction of at least one oxirane with carbon dioxide in the presence of a metal-polycarboxylic acid compound in an aprotic, non-water-miscible solvent at a temperature of from 40 to 120° C. and at a pressure of from 1 to 100 bar, where the molar ratio of monomer to metal-polycarboxylic acid compound is ?75, (b) addition of an aqueous solution of an inorganic acid to the reaction mixture once the reaction has ended, (c) removal of the aqueous phase, (d) if appropriate, washing of the remaining organic phase with water, and (e) devolatilization and drying of the resultant slurry of the polycarbonate in the aprotic, non-water-miscible solvent, and to the polycarbonate prepared via the process, and also to the use of the polycarbonate.

Abstract: Disclosed is a method for producing an aqueous polymer dispersion, according to which unsaturated monomers are first polymerized by means of suitable catalysts, whereupon the obtained polymers that are swelled with all or some of the remaining unreacted monomers are added to surface-active substances and water in a last step in which the obtained polymers are not entirely separated from the remaining monomers.

Abstract: This invention is directed to transparent blends of polypropylene carbonate with poly lactide and/or polyhydroxyalkanoates, to a process for the preparation of said blends as well as the use of said blends.

Abstract: Lactones are prepared by catalytic carbonylation of oxiranes using a catalyst system comprising a) at least one cobalt compound as component A and b) at least one metal compound of the formula (I) as component B, MXxRn-x ??(I) where M is an alkaline earth metal or a metal of group 3, 4 or preferably 12 or 13 of the Periodic Table of the Elements, R is hydrogen or a hydrocarbon radical which may be substituted on the carbon atoms other than the carbon atom bound to M, X is an anion, n is a number corresponding to the valence of M and x is in the range from 0 to n, with n and x being selected so that the compound is uncharged, as catalyst.

Abstract: Lactones are prepared by catalytic carbonylation of oxiranes using a catalyst system comprising a) at least one carbonylation catalyst A comprising uncharged or anionic transition metal complexes of metals of groups 5 to 11 of the Periodic Table of the Elements and b) at least one chiral Lewis acid B, with the exception of [(salph)Al(THF)2][Co(CO)4], as catalyst.

Abstract: A process for preparing thermoplastic poly(3-hydroxyalkanoates) with a molar mass greater than 6 000 g/mol and a melting point in the range from 70 to 170° C., by reacting an oxirane compound with carbon monoxide in the presence of a transition metal catalyst which has rhodium(0), nickel(0), iron(0), cobalt(0) or palladium(0) as central metal and has been chelated with neutral Lewis bases, and also in the presence of diisocyanates, ortho esters, acetals, anhydrides, P2O5, MgO, MgCl2, MgSO4, zeolites, or a mixture of these, at a pressure in the range from 1 to 250 bar and at from room temperature to 150° C.

Abstract: A process is described for preparing polyoxymethylene by contacting a formaldehyde source with a catalyst of the formula I [ML1aL2b]cm+Zc·m/nn???(I) where M is a metal of group VIII; L1 is a ligand having at least one ?-electron pair; each L2 is independently tetrahydrofuran or a ligand which is displaceable by tetrahydrofuran; Z is an anion; a is 1 or 2; b is an integer from 0 to 4; c is 1 or 2; and m and n are integers from 1 to 4.

Abstract: A process is described for preparing polyoxymethylene by contacting a formaldehyde source with a catalyst of the formula I [CpvMLw]m+Zm/nn???(I) where M is Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh or Ir, Cp is a cyclopentadienyl ligand C5H(5-u)R1u, where u is from 0 to 5 and R1 is alkyl, alkenyl, aryl, heteroaryl, aralkyl, COOR2, COR2, CN or NO2, and R2 is H, alkyl, aryl or aralkyl, v is 1 or 2, each L is independently a nitrile, CO or a ligand displaceable by CO, w is an integer from 0 to 4, Z is an anion, and m and n are each independently an integer from 1 to 3.

Abstract: The invention relates to a catalytical process for preparing poly(3-hydroxyalkanoates) by copolymerizing an oxirane compound with carbon monoxide in the presence of a) at least one single- or multicenter neutral transition metal complex (A) based on a metal of groups 5 to 11 of the Periodic Table of the Elements, in which the metal center(s) is/are present in the formal oxidation state 0, and/or b) at least one single- or multicenter anionic transition metal complex (B) based on a metal of groups 5 to 11 of the Periodic Table of the Elements, where multicenter transition metal complexes have metal centers which, without exception, are of the same transition metal, which comprises carrying out the copolymerization in the presence of at least one nucleophile other than hydroxy-substituted pyridine compounds.

Abstract: A process is described for preparing polyoxymethylene by contacting a formaldehyde source with a catalyst of the formula I where M is TiO, ZrO, HfO, VO, CrO2, MoO2, WO2, MnO2, ReO2, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Zn, Cd, Hg, Sn, SnO or PbO; R1, R2 and R3 are independently a radical which is selected from H, alkyl, aryl and aralkyl and the radical may be partly or fully halogenated; Z is an anion; and n is 1 or 2.