Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

Lanxess Corporation

Bayer Corporation

Zsolt Szentivanyi

Joachim Thormer

Hartmuth Buding

Heinrich Konigshofen

Hans-Josef Buysch

Dirk Achten

Werner Obrecht

Sharon X Guo

Michael Klimpel

Lothar Reif

Stephan Glander

Renke Mottweiler

Emilie Barriau

Heinrich Berg

Stefan Glander

Josef Witte

Frederic Guerin

Franz-Josef Mersmann

Bert Brassat

John W Goossens

Stephen D Pask

Rafael Warsitz

Christiane Oppenheimer-Stix

Josef Witt

Jean Mirza

Fr&eacute;d&eacute;ric Gu&eacute;rin

Jurgen Wassen

Johann Hohn

Friedrich Leibbrandt

Ernst Rohde

Gregor Dudziak

Jurgen Pabst

The present invention relates to dithiocarbamic esters, their preparation and their use for regulating the degree of polymerization during the polymerization of monomers, such as during the polymerization of chloroprene to give polychloroprene, and during the polymerization of 2,3-dichlorobutadiene to give poly-2,3-dichlorobutadiene, and during the copolymerization of chloroprene with 2,3-dichlorobutadiene. The present invention further relates to polymers which are obtainable via the polymerization of monomers in the presence of the dithiocarbamic esters of the invention. The present invention also relates to polymers which contain end groups derived from the dithiocarbamic esters of the present invention.

Dithiocarbamic esters

The present invention relates to hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art.

Low molecular weight hydrogenated nitrile rubber

The present invention relates to the process for preparing hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art.

The present invention relates to a method for the preparation of purified elastomers prepared by emulsion polymerization, wherein the level of impurity is reduced by up to 99 wt. %, expressed in terms of the unpurified elastomer. The present invention also relates to elastomers which can be obtained by the method according to the present invention, to the use of the elastomers for the production of all types of products, and to the product which is produced by processing the elastomer which can be obtained by the method according to the present invention.

Method for the preparation of purified elastomers from solution

The present invention relates to hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art. The present invention is also related to shaped articles containing hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art.

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

Rubber mixtures of hydrogenated nitrile rubber and ethylene/acrylonitrile copolymers, which contain copolymerized units of compounds with at least two (meth-)acryloyl groups, are easy to process and give vulcanized materials of high solvent resistance without any deterioration in the mechanical properties.

Cross-linkable mixtures based on hydrogenated nitrile rubber and

Products prepared by reacting isopropenyl phenols or bisphenols of the bisphenol-A type with diphenyl amine, phenothiazin or derivatives thereof in the presence of acidic catalysts are used as stabilizers for polyamides and rubbery materials.

New Stabilizers and their use for the production of stabilized

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

The invention relates to a process for the preparation of partially hydrogenated nitrile rubbers with defined residual double bond contents of between 2.0 and 5.0%, preferably 3.0 and 4.5%.

Process for the preparation of partially hydrogenated nitrile rubbers

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

Compounds corresponding to the formula ##STR1## wherein R.sup.1 and R.sup.2 represent H or C.sub.1 -C.sub.4 -alkyl,

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Leverkusen, Germany

Zsolt Szentivanyi