Abstract: Mixtures of polychloroprene and hydrogenated nitrile rubber give vulcanizates combining high modulus with a high dynamic stress absorption capacity.

Abstract: Hydrogenation products of olefinically unsaturated polymers having nitrile groups prepared in the presence of ruthenium catalysts in a solvent comprising a low-molecular ketone and a secondary or tertiary C.sub.3 -C.sub.6 -alcohol by hydrogenation, can be processed to vulcanizates with improved compression set values.

Abstract: The selective hydrogenation of unsaturated compounds which carry reducible groups containing nitrogen succeeds in a homogeneous phase with the preservation of the reducible groups containing nitrogen, characterized in that a compound of the formulaRuH.sub.2n L.sub.5-nis used as a catalyst, in whichL signifies a phosphane or arsane andn signifies 1 or 2.

Abstract: Thermoplastic moulding compositions consisting ofI. 75 to 99.5% by weight of a polymer ofA. 0 to 95% by weight, 95% or less by weight; of a graft copolymer prepared by grafting polymerization ofA.1 5 to 95% by weight of a mixture ofA.1.1 50 to 95% by weight of styrene, .alpha.-methylstyrene, nuclear-substituted styrene, methyl methacrylate or mixtures thereof andA.1.2 50 to 5% by weight of (meth)acrylonitrile, methyl methacrylate, maleic anhydride, N-substituted maleimide or mixtures thereof onA.2 95 to 5% by weight of a rubber with a glass transition temperature Tg or <0.degree.C., andB. 100 to 5% by weight of a thermoplastic polymer ofB.1 95 to 50% by weight of styrene, .alpha.-methylstyrene, nuclear-substituted styrene or methyl methacrylate or mixtures thereof andB.2 5 to 50% by weight of (meth)acrylonitrile, methyl methacrylate, maleic anhydride, N-substituted maleimide or mixtures thereof andII. 25 to 0.5% by weight of a hydrogenated nitrile rubber.

Abstract: An advantageous process for the heterogeneous catalytic hydrogenation of nitrile group-containing unsaturated polymers retaining nitrile groups, is characterised in that palladium supported on alkaline earth metal carbonates is used as hydrogenation catalyst.

Abstract: Statistical copolymers of from 85 to 52% by weight of a conjugated diene, from 15 to 48% by weight of at least one unsaturated nitrile and from 0 to 10% by weight of further monomers, copolymerizable with diene and nitrile, which have a molecular weight M.sub.n of from 0.5 to 30 kg/mol and a degree of hydrogenation of the double bonds of greater than 80%, give nitrile rubbers, which are mixed and colvulcanized with these copolymers, an increased ozone resistance.

Abstract: Carbon-carbon double bonds are hydrogenated selectively in a compound containing a reducible, nitrogen-containing group if the hydrogenation is carried out in the presence of a ruthenium complex catalyst. Also disclosed are new ruthenium complexes for use in such selective hydrogenation.

Abstract: Unsaturated polymers containing nitrile groups can be hydrogenated with the preservation of the nitrile group in a homogeneous phase with a catalyst of the formula:RuX[(L.sub.1) (L.sub.2).sub.n ]in whichX represents hydrogen, halogen or SnCl.sub.3,L.sub.1 represents optionally substituted indenyl,L.sub.2 represents a phosphane, bisphosphane or arsane and n signifies 1 or 2,if a low-molecular ketone is used as a solvent.

Abstract: A: Thermoplastic moulding materials made from a vinyl chloride homopolymer or copolymer containing at least 50% by weight of vinyl choloride units,B: a graft polymer, prepared by graft polymerization ofB1: 50 to 85 parts by weight of a mixture of at least two of the monomers styrene, acrylonitrile, methyl methacrylate and .alpha.-methyl styrene onB2: 50 to 15 parts by weight of an at least partially crosslinked butadiene or acrylate rubber having average particle diameters of 0.08 to 1 .mu.

Abstract: Covulcanizates with good mechanical properties obtained from mixtures of (a) from 50 to 5% by weight of chlorinated or chlorosulphonated polyethylene, acrylate rubber or ethylene vinyl alcohol copolymers and (b) from 50 to 95% by weight of partially or completely hydrogenated nitrile group-containing elastomers containing from 25 to 140 nitrile nitrogen atoms and less than 35 double bonds for each 1,000 carbon atoms, by cross linking.

Abstract: The selective hydrogenation in a homogeneous phase of unsaturated compounds carrying reducible groups containing nitrogen so as to preserve the reducible groups containing nitrogen succeeds with excellent yields if a compound corresponding to the following general formula:RuH.sub.m (R.sub.1 CO.sub.2).sub.n (L).sub.pwhereinR.sub.1 represents an optionally substituted alkyl, aryl, cycloalkyl or aralkyl group;L represents a phosphane or arsane;m represents 0 or 1;n represents 1 or 2; andp represents 2 or 3;is used as catalyst.

Abstract: Co-vulcanizates which have good mechanical properties, a good resistance to oil, an effective flame resistance and a low smoke gas density are obtained from mixtures of (a) from 95 to 5% by weight of EVA rubber and (b) from 5 to 95% by weight of elastomers which contain nitrile groups and have from 25 to 140 nitrile groups and less than 35 double bonds per 1000 carbon atoms, by radical cross-linking.

Abstract: Carbon-carbon double bonds are hydrogenated selectively in a compound containing a reducible, nitrogen-containing group if the hydrogenation is carried out in the presence of a ruthenium complex catalyst. Also disclosed are new ruthenium complexes for use in such selective hydrogenation.

Abstract: The present invention relates to thermoplastic moulding compositions of (A) thermoplastic polycarbonates, if appropriate mixed with (B) thermoplastic polyalkylene terephthalates and, if appropriate, additionally with (C) elastomeric graft polymers, characterized in that they contain (D) a terpolymer of acrylates, vinyl esters and unsaturated nitriles.

Abstract: Statistical copolymers of from 85 to 52% by weight of a conjugated diene, from 15 to 48% by weight of at least one unsaturated nitrile and from 0 to 10% by weight of further monomers, copolymerizable with diene and nitrile, which have a molecular weight M.sub.n of from 0.5 to 30 kg/mol and a degree of hydrogenation of the double bonds of greater than 80%, give nitrile rubbers, which are mixed and colvulcanized with these copolymers, an increased ozone resistance.

Abstract: Equipment for the exploration and/or production of petroleum and natural gas having elastomeric components have high resistance to materials encountered if the elastomeric components are shaped from a hydrogenated butadiene-acrylonitrile copolymer with a residual double bond content less than 1% and unhydrogenated nitrile groups.

Abstract: Nitrile group-containing polymers are hydrogenated in a homogeneous phase with preservation of the nitrile groups in a low molecular weight ketone as a solvent and with a compound corresponding to formulaRuX[(L.sub.1)(L.sub.2).sub.n ]as a catalyst, whereinX represents hydrogen, halogenL.sub.1 represents hydrogen, halogen, optionally substituted cyclopentadienyl,L.sub.2 represents a phosphane, bisphosphane or arsane andn is 1, 2 or 3 and[(L.sub.1)(L.sub.2).sub.n ] represents a cyclopentadienyl bisphosphane.

Abstract: The hydrogenation of NBR in an aromatic solvent with tris-(triphenylphosphane)-rhodium-(I) halide as catalyst under hydrogen pressures of from 20 to 350 bars and at temperatures in the range from 100.degree. to 145.degree. C. leads to products having degrees of hydrogenation of at least 90% and outstanding properties when the catalyst concentration amounts to between 0.05 and 0.6% by weight, based on solid rubber, and when hydrogenation is carried out in the presence of at most 2% by weight of triphenylphosphane.

Abstract: Co-vulcanizates having good mechanical properties are obtained from mixtures of: (a) from 35 to 5%, by weight, of hydrocarbon elastomers; (b) from 65 to 95%, by weight, of nitrile group-containing elastomers having from 25 to 140 nitrile nitrogen atoms and less 12 double bonds per 1000 carbon atoms; by radical cross-linking.

Abstract: The selective hydrogenation of unsaturated compounds which carry reducible groups containing nitrogen succeeds in a homogeneous phase with the preservation of the reducible groups containing nitrogen, characterized in that a compound of the formulaRuH.sub.2n L.sub.5-nis used as a catalyst, in whichL signifies a phosphane or arsane andn signifies 1 or 2.