Abstract: This invention relates to novel catalyst compositions based on Ruthenium- or Osmium-based complex catalysts of the Grubbs-Hoveyda, Grela or Zhan type and specific co-catalysts comprising at least one vinyl group, pref. ethyl vinyl ether, and to a process for selectively hydrogenating nitrile rubbers in the presence of such catalyst compositions, preferably with a preceding metathesis step using the same complex catalyst as in the hydrogenation step.

Abstract: A copolymer rubber includes, based on a total amount of 100% by weight of all monomer units, ?,?-ethylenically unsaturated nitrile units, conjugated diene units, and ?,?-ethylenically unsaturated monocarboxylic acid monoester units selected from the group consisting of methoxyethyl (meth)acrylates, and polyethylene glycol (meth)acrylates. The rubber has a glass transition temperature lower than ?20° C., an oil swelling of not more than 20 vol %, and provides a balance of good low-temperature stability and oil resistance.

Abstract: Power transmission belts have a hydrogenated nitrile-butadiene-PEG acrylate copolymer of 25% to 38% by weight by weight of at least one ?,?-ethylenically unsaturated nitrile unit, 40% to 60% by weight by weight of at least one conjugated diene unit and 10% to 25% by weight by weight of at least one PEG acrylate unit derived from a PEG acrylate of the general formula (I) where R is hydrogen or branched or unbranched C1-C20-alkyl, preferably methyl, ethyl, butyl or ethylhexyl, n is 1 to 8, preferably 2 to 8, more preferably 2 to 5 and most preferably 3 and R1 is hydrogen or CH3-, where the hydrogenated nitrile-butadiene-PEG acrylate copolymer, if n is 1, does not contain any further copolymerizable monomer unit having a free carboxylic acid group.

Abstract: The present invention relates to ruthenium- or osmium-based complex structures, to the synthesis thereof and their use as catalysts for hydrogenating unsaturated substrates.

Abstract: The present invention relates to polymers functionalized by terminal groups that have, at the chain ends thereof, an ether-containing group of the formula (V) —[—O-A-O?]nXn+??(V) where A is a divalent organic moiety, and X is either H, and n=1, or X is a metal and n is an integer of 1 to 4.

Abstract: Novel rubbers are provided which are stabilized by a specific combination of at least three different anti ageing compounds. Said rubbers dispose of an increase storage stability as well as an improved colour stability over the short term as well as over the long term. The invention also relates a process for producing said novel rubbers, vulcanizable mixtures based thereon, a process for producing vulcanizates from those mixtures and the vulcanizates obtained.

Abstract: The invention relates to a process for preparing 1,3-butadiene by means of ene-yne metathesis over at least one transition metal catalyst of the element ruthenium.

Abstract: The present invention relates to copolymers of ethylene, vinyl esters of an alkyl carboxylic acid and other specific unsaturated carboxylic esters which have lower glass transition temperature than copolymers of ethylene and vinyl esters of an alkyl carboxylic acid, and also to production and use of these, to vulcanizable mixtures comprising the copolymers of the invention, to crosslinking of these and to vulcanizates and moldings obtainable therefrom.

Abstract: The present invention relates to a composition obtainable by mixing to incorporate at least one microgel (B) that has been crosslinked by means of free-radical generators photochemical by using a wavelength>0.1 ?m and/or thermally and that contains hydroxy groups and that is based on polybutadiene-acrylonitrile copolymers (NBR) into polyvinyl chloride (PVC) in an extruder, to processes for production thereof and to use thereof for reproduction of transparent thermoplastically processable molded items, and also to molded items produced from the said compositions.

Abstract: The invention relates to a process for determining the degree of branching of modified polymers wherein the polymers are modified in the sense that their degree of branching after polymerization was increased once more, wherein the modified polymers are treated with a polar transformation mixture comprising a compound of general formula (I) R1—S—S—R1?? (I) wherein the Mooney viscosity (ML 1+4 at 100° C.) of the polymers is determined before and after the treatment with the polar transformation mixture and the degree of branching is determined.

Abstract: The present invention relates to hydrogenated nitrile-butadiene-PEG acrylate copolymers, to the preparation thereof, to vulcanizable mixtures comprising hydrogenated nitrile-butadiene-PEG acrylate copolymers and the preparation thereof, and vulcanizates based on hydrogenated nitrile-butadiene-PEG acrylate copolymer.

Abstract: The present invention relates to vulcanizable compositions on the basis of hydrogenated nitrile rubber, a mineral filer with specific surface area (N2 surface area) smaller than 10 m2/g comprising at least 40% by weight silicate (SiO2) and at least 10% by weight aluminium oxide (Al2O3), a sodium silicate and a crosslinking system on the basis of free-radical donors. The invention further relates to the production of these vulcanizable compositions, and also to vulcanized products which are produced therefrom and their use in particular in gaskets, belts, roll coverings, hoses and cables.

Abstract: Essentially ETU-free cross linkable compositions comprising chloroprene rubber, a cross-linker and a vulcanization accelerator, which have a defined content of ions from the second or third main group and resinate anions and thus possesses improved curing characteristics, a process for vulcanization of such compositions and vulcanizates obtained thereby.

Abstract: Essentially ethylene thiourea free cross linkable composition comprising a chloroprene rubber having defined contents of cations from the second or third main group and resinate anions are provided, which possess improved curing characteristics for increased productivity and lower vulcanization temperatures for energy-saving manufacturing methods and vulcanizates obtained by using said chloroprene rubber.

Abstract: The invention relates to specific nanocomposites comprising at least one sheet silicate and at least one rubber, to a process for production thereof and to various products based on these nanocomposites.

Abstract: The invention relates to vulcanizable compositions comprising (a) at least one ethylene-vinyl acetate copolymer containing epoxy groups and having a vinyl acetate content of at least 20% by weight, preferably at least 30% by weight, more preferably at least 40% by weight, based on the ethylene-vinyl acetate copolymer containing epoxy groups, and (b) at least one carboxylated nitrile rubber.

Abstract: The present invention is related to a process for the preparation of polymers containing amino groups by hydrogenation of nitrile groups containing polymers by heterogeneous catalysis.

Abstract: The present invention relates to ruthenium- or osmium-based complex structures, to the synthesis thereof and their use as catalysts for hydrogenating unsaturated substrates.

Abstract: Particulate compositions solid at 20° C. and comprising at least one copolymer based on at least the following comonomers a) to d) a) conjugated diene, b) ?,?-unsaturated nitrile, c) at least one polyfunctional radically polymerizable comonomer and d) at least one carboxyl-, hydroxyl-, epoxy- and/or amino-group-functional radically polymerizable comonomer, which possess an average particle diameter of the primary particles of 5 to 500 nm, characterized in that these compositions possess a pourability to EN DIN 6186:1998 (funnel diameter 15 mm) of not more than 33 s.

Abstract: The invention relates to vulcanizable compositions based on carboxylated nitrile rubbers, at least one resol crosslinker, at least one silicatic filler and at least one specific silane, to a process for preparing these vulcanizable compositions, to a process for producing vulcanizates therefrom and to the vulcanizates thus obtained. The vulcanizates feature good mechanical and dynamic properties and an excellent compression set.