Bayer Aktiengesellschaft

Joachim Thormer

Hartmuth Buding

Zsolt Szentivanyi

Heinrich Konigshofen

Paul Fiedler

Friedrich Leibbrandt

Werner Obrecht

Thomas Himmler

Hans Rudolph

Thomas Scholl

Rudolf Braden

Herbert Bartl

Rudiger Musch

Wilhelm Gobel

John W Goossens

Helmut Hurnik

Wilfried Nolte

Hans-Wilhelm Engels

Jochen Schnetger

Otto Benn

Jean Mirza

Gerhard Giersiepen

Johann Hohn

Paul-Christian Fiedler

Hans H Bertram

Jurgen Pabst

Ernst Rohde

Vulcanizable rubber compositions are disclosed which contain partial polycarboxylic acid esters or their salts. Vulcanizates obtained from the compositions are readily processible and are found to have reduced compression set and high tension values, in particular after ageing by heat.

Vulcanizable rubber compositions containing salts of partial carboxylic

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

Rubber compounds of polychloroprene and hydrogenated nitrile rubber

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.

Hydrogenation of unsaturated polymers containing nitrile groups

Hydrogenated nitrile rubbers filled with sodium aluminium silicate suffer relatively little deterioration of the mechanical properties, e.g. elongation at break, during hot air aging.

Heat-stable rubber compositions based on hydrogenated nitrile rubber

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.

Low molecular weight copolymers and covulcanizates produced therefrom

This invention relates to fabric or cord coated as an individual filament or as the finished carrier material with hydrogenated nitrile rubber and the laminated materials prepared therefrom with the vulcanized rubber. It, furthermore, relates to a latex of said hydrogenated nitrile rubber.

Laminated materials of pretreated fibre material and vulcanization

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.

Polymer mixtures and covulcanizates produced therefrom

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:

Process for the selective hydrogenation of unsaturated compounds

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.

Polymer mixtures and co-vulcanizates produced therefrom

Low molecular weight copolymers and covulcanisates produced therefrom

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 formula

Hydrogenation of nitrile group-containing unsaturated polymers

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.

Shaped articles for use in the exploration for and/or production of

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.

Production of hydrogenated nitrile rubbers

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.

Polymer mixtures

Co-vulcanizates are produced from mixtures of (a) from 95 to 5% by weight of fluoroelastomers and (b) from 5 to 95% by weight of elastomers which contain nitrile groups and have from 25 to 140 nitrile-nitrogen atoms and less than 35 double bonds per 1000 carbon atoms, and (c) conventional mixture ingredients, the percentages relating to the sum total of (a) and (b). The co-vulcanizates are suitable for the production of seals and other rubber articles, in particular for areas of use which impose exacting requirements.

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Leverkusen, Germany

Joachim Thormer