Abstract: Polyisocyanates are produced by reacting a polyamide solution with a phosgene solution. After the product polyisocyanate has been recovered, the solvent or a portion of the solvent employed is treated with crosslinked polymers insoluble in the solvent which polymers contain primary and/or secondary alcoholic hydroxyl groups and/or primary and/or secondary amino groups. After treatment, the polymer and any reaction products are removed. The solvent may then be reused. Preferred solvents are chlorobenzene and o-dichlorobenzene. The preferred polymers are bead polymers or bead copolymers of (meth)acrylic acid or styrene/divinyl benzene copolymer.

Abstract: A thermoplastic molding composition comprising a blend of a thermoplastic polyester, a rubber-elastic impact modifying compound and a certain blocked (capped) polyisocyanate prepolymer is disclosed characterized in that it has an improved level of impact strength.

Abstract: Isocyanates containing ester and/or amide groups are produced by reacting (a) an isocyanatocarboxylic acid chloride with (b) an organic compound containing a silylated alcoholic group and/or silylated phenolic hydroxyl group and/or silylated amino group which compound contains no other group which is reactive with isocyanate and chlorocarbonyl groups under the reaction conditions. The reaction of (a) with (b) is carried out at a temperature of from -20.degree. to 150.degree. C. This process makes it possible to produce the desired isocyanates with a high degree of selectivity.

Abstract: The present invention is directed to a process for the production of aqueous polyurethane-polyurea dispersions by reacting NCO-prepolymers having an average NCO-functionality of 2 to 2.3 and an average molecular weight of about 700 to about 5000 with organic polyamines having an average amine functionality of 2.05 to about 3 and an average molecular weight of 60 to about 2000 containing primary and/or secondary amino groups at an NCO/NH ratio about 1.05:1 to about 7:1 in the presence of a water-miscible, weakly polar solvent inert to isocyanate groups and having a boiling point at normal pressure below 100.degree. C., converting the resulting solution of the reaction products into an aqueous dispersion by the addition of water and optionally removing the solvent used by distillation, characterized in that the reactants and amounts used are selected such that the resulting reaction products have an NCO-functionality of 2.2 to about 3 and NCO-content of about 0.1 to 5% by weight.

Abstract: This invention relates to spreading pastes containing polyurethanes which are prepared from special synthesis components selected from the group of silicone resins, polyethers or polyesters containing aromatic segments or perfluorocarbon resins. The spreading pastes also contain organic solvents and optionally non-solvents for the polyurethanes so that when the coatings are used to coat textile substrates according to the direct or transfer process, the coatings may be cured based on the principle of evaporation coagulation.

Abstract: Iron oxide slurries and suspensions are made from water, iron oxide pigments and a dispersing agent which is water soluble salt of citric acid or tartaric acid. The preferred dispersing agents are the ammonium, sodium and potassium salts of citric acid and tartaric acid. The sodium salts of citric acid are particularly preferred. A known additive such as a fungicide may be included. To keep the slurries and suspension from settling, stabilizing agents may also be included.

Abstract: The present invention is directed to a continuous process for the production of aqueous polyurethane-urea dispersions by(a) mixing an emulsifiable isocyanate-terminated prepolymer with an aqueous medium in a low shear, stator-rotor dynamic mixer operating at a speed of about 500 to 8000 rpm utilizing a mixing wattage of about 0.3 to 10.0 watts/cubic centimeter and a mixing volume of at least about 0.1 liters, the average residence time of the aqueous medium and the prepolymer being about 1 to 30 seconds and the overall flow rate through the dynamic mixer being at least about 50 kg/h and(b) reacting the dispersed isocyanate-terminated prepolymer prepared in (a) with a polyamine chain extender to form an aqueous polyurethane-urea dispersion.

Abstract: The present invention is directed to a process for the production of oligourethanes having terminal mercapto groups by reacting organic polyisocyanates with sub-equivalent quantities of organic polyhydroxyl compounds and a mercapto-alkanol in the presence of at least one ester of phosphoric acid containing at least one hydroxyl group bound to phosphorus. The present invention is also directed to the mercapto group-containing oligourethanes obtainable by this process and their use as binders for oxidatively-hardenable coating and sealing compositions, additives for epoxide resins and cross-linking agents for plastics materials and plastics crude products containing olefinic double bonds.

Abstract: Polyaminohydroxyl compounds having molecular weights of from 200 to 20,000 and a functionality greater than 1 but less than or equal to 8 containing 0.165-16.5 wt. % amino and hydroxyl groups and 0.295-29.5 wt. % urethane and/or urea groups are produced by hydrolyzing the corresponding NCO prepolymer containing OH groups. The equivalent ratio of amino groups to hydroxyl groups in these polyaminohydroxyl compounds is from 99:1 to 0.1:99.9. Groups which are inert with respect to amines and isocyanates may optionally be present in the polyaminohydroxyl compounds in quantities such that the equivalent ratio of amine groups to inert groups is from 100:0 to 33.3:66.6 and the equivalent ratio of hydroxyl groups to inert groups is from 100:0 to 33.3:66.6. These polyaminohydroxyl compounds are useful in the production of polyurethanes. The polyaminohydroxyl compounds in which the difference between the sum of amino groups plus hydroxyl groups plus inert groups and the sum of hydroxyl groups plus inert groups is 2.+-.

Abstract: The present invention relates to bis-quinoxalines of the formula I ##STR1## their preparation, their use as branching agents for the preparation of branched, thermoplastic polycarbonates and the branched thermoplastic polycarbonates.

Abstract: The present invention is directed to a process for the preparation of an oligourethane and free isocyanate groups which soluble in aromatic solvents and suitable as a lacquer binder by reacting an organic diisocyanate with a high molecular polyol and a low molecular weight polyol which contains 2,2,4-trimethylpentane-1,3-diol, its ethoxylation and/or propoxylation products or addition products of this low molecular weight diol with .epsilon.-caprolactone. The present invention is also directed to oligourethanes produced by this process and to their use as the binder or binder component in moisture hardening one-component lacquers.

Abstract: Foamable, thermoplastic molding composition exhibiting an improved level of impact resistance is provided. The composition, which is suitable for the preparation of expanded molded parts, comprise a thermoplastic resin, preferably at least one selected from a group consisting of polycarbonate, polyalkylene terephthalate, aromatic polyester and polyester carbonate, a nucleating agent, a chemical blowing agent and an anhydride. It was unexpectedly found that the composition is suitable for the molding of articles having an improved level of impact resistance.

Abstract: The present invention is directed to a process for the preparation of a segmented, aliphatic-aromatic polyether-copolycarbonate containing structural units conforming to ##STR1## wherein --D-- is a diphenolate radical and units conforming to ##STR2## wherein --O--Polyether--O-- is an aliphatic polyether-diolate radical, by the phase boundary process in which aliphatic polyether diol and a mixture of dihydroxy compounds are reacted with a carbonic acid halide which is employed in molar excess in relation to the dihydroxy compounds and in which the aqueous phase is kept at a pH value of at least 13 and where the polycondensation reaction is carried out in a reactor by addition of an amine catalyst.The invention is further directed to the polyether polycarbonate which is obtained by the process and to the preparation of membranes from said polyether copolycarbonate.

Abstract: The present invention relates to a process for the improved separation of clarified liquids from biomass in the aerobic and/or anaerobic biological treatment of sewage carried out using magnetically separable materials as carriers. The magnetically separable inorganic materials are used in quantities of from 1 to 150% by weight, based on activated sludge dry matter. The carriers consist of magnetically separable inorganic materials. The magnetically separable materials used are oxides or mixed oxides of heavy metals, preferably iron oxides, such as Fe.sub.3 O.sub.4 (magnetite) and .gamma.-Fe.sub.2 O.sub.3, which are used in average particle sizes of less than 50 .mu.m, preferably less than 10 .mu.m and more preferably less than 3 .mu.m (for example from 0.1 to 1 .mu.m). These magnetic carriers provide for improved sedimentation or for magnetic separation of the biomasses containing the magnetic materials in the biological treatment of sewage.

Abstract: The present invention is directed to a process for preparing a cellular polyurethane by reacting with an NCO-reactive component in the presence of a homogeneous mixture of an optionally water-containing adduct of carbon dioxide an amine containing at least one secondary amino group, low primary amino groups and at least one primary or secondary hydroxyl group (provided there are not more primary hydroxyl groups than amino groups), an amine catalyst and optionally monofluorotrichlormethane. The present invention is directed to the homogeneous mixture these three components.

Abstract: This invention relates to polyurethane(urea) compositions which contain foam and which are preferably cationically modified, contain non-abrasively bonded fillers and have a very high water absorbability (WAF).Production is effected by reacting isocyanate-terminated prepolymers with a quantity of water far exceeding the stoichiometric quantity in the presence of foams in particle or film form. The reaction mixture may also contain lignite powder and/or peat, other inorganic and organic fillers and/or biomasses (living cells, living bacteria, enzymes).The polyurethane(urea) compositions contain up to 95% by weight of foam particles and may contain further fillers (preferably lignite and/or peat). The compositions are swollen and have a high water content during production. Their water absorbability (WAF) when suspended in water is 33 to 97% by weight of water.

Abstract: Flame resistant, reinforced thermoplastic molding compositions based on polyethylene terephthalate resins were found to have a lowered tendency to drip during burning upon the addition thereto of a sufficient amount of a particular ionic elastomer. The addition of the drip suppressant in accordance with the invention does not compromise the physical and mechanical properties of the composition.

Abstract: The present invention relates to the preparation of thermoplastic poly-(diorganosiloxane)/polycarbonate block copolymers containing monoalkylphenyl or dialkylphenyl end groups by the phase boundary process, and to the block copolymers which can be obtained by the process.

Abstract: The present invention relates to a process for the production of polyisocyanate compositions containing urethane groups and having an isocyanate content of about 0.5 to 45% by weight by the reaction of(a) an organic polyisocyanate or mixtures thereof having an isocyanate content of about 30 to 50% by weight with(b) organic polyhydroxyl compounds using an equivalent ratio of isocyanate groups to hydroxyl groups of at least 1.8:1, characterized in that the polyhydroxyl compounds (b) are based on(b1) polyhydroxypolyacrylates having an average molecular weight, determined by vapor pressure osmometry, of 232 to about 100,000 which optionally contain urethane or ester groups in side chains, and a statistical average of at least one alcoholic hydroxyl group per molecule(b2) optionally in admixture with up to about 250% by weight, based on (b1), of other polyhydroxyl compounds in the molecular weight range of 62 to about 12,000.

Abstract: A partially devitrified porcelain enamel composition is formed by melting an oxide mixture in which 20-50 wt % BaO, 30-60 wt % SiO.sub.2, and 2-20 wt % TiO.sub.2 are present to form a homogeneous melt, quenching the melt to form a frit and firing the frit. The oxide mixture may optionally include K.sub.2 O, Na.sub.2 O, Li.sub.2 O, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, As.sub.2 O.sub.3, CaO, CeO.sub.2, MgO, F.sub.2, N.sub.2 O.sub.5, PbO, P.sub.2 O.sub.5, Sb.sub.2 O.sub.3, SnO.sub.2, SrO, ZnO, ZrO.sub.2, and MoO.sub.3. Metal substrates coated with such a partially devitrified porcelain enamel composition are particularly suitable for the production of electronic circuits.