Bayer Aktiengesellschaft

Rudiger Musch

Wilhelm Gobel

Eberhard Muller

Wolfgang Konter

Rudiger Schubart

Werner Obrecht

Peter Wendling

Gerhard Hohmann

Peter R Muller

Gottfried Pampus

Oskar Nuyken

Ulrich Eisele

Rudolf Casper

Michael Happ

Heinrich Alberts

Hartmuth Buding

Heinrich Konigshofen

Joachim Thormer

Hans Magg

Gunter Arend

Wilfried Nolte

Stephen D Pask

Anthony Sumner

Renke Mottweiler

Stefan Kelbch

Ludwig Mott

Karl-Heinz Schabel

Jean Mirza

Friedrich Leibbrandt

Michael Walter

Thomas Dittmer

Steven Pask

Heinz-Hermann Greve

Axel Vischer

Hans-Peter Muhlbauer

Compositions comprising new halogenated butyl rubbers with a defined, low content of halogen, a defined content of non-halogenated double bonds and a defined content of anti-agglomeration/vulcanisation control agents and containing polymer compounds comprising special amidines, mercapto or zinc mercapto compounds and polymers possess outstanding mechanical and physiological properties, so that they are suitable for the production of tyres, particularly tyre inner liners, tyre sidewalls and tyre treads.

Polymer compounds and their use for the vulcanization of halogenated

The polymer compounds according to the invention prepared from specific amidines, zinc mercapto compounds and elastomers are ideally suitable for the production of thermally stable rubber vulcanisates containing halogen. The vulcanisates of rubbers containing halogen obtained by means of the polymer compounds are distinguished by a reduced tendency towards unwanted post-vulcanization and, at elevated storage temperatures, are resistant to thermal and oxidative degradation.

Polymer compounds and the use thereof for vulcanising rubbers containing

The polymer compounds according to the invention, comprising special amidines, mercapto compounds and elastomers, are mainly suitable for the production of thermally stable, halogen-containing vulcanized rubbers. The vulcanized, halogen-containing rubbers obtained by means of the polymer compounds are distinguished by a reduced tendency to undergo unwanted subsequent vulcanization and are stable towards thermal and oxidative degradation at high storage temperatures.

Polymer compounds and their use for the vulcanisation of

Vulcanizable, mercaptan- and/or xanthogen-disulfide-regulated polychloroprene rubber are produced by emulsion polymerization of chloroprene and, based on polymerizable monomer used, 0 to 30 parts by weight ethylenically unsaturated, other monomers copolymerizable with chloroprene in an alkaline medium by a process in which

Process for the production of vulcanizable mercaptan-and/or xanthogen

The metal oxide vulcanization of polychloroprene in the presence of amidine compounds, but in the absence of magnesium oxide, leads to vulcanizates which are capable of withstanding high temperatures, even under dynamic stress.

Process for the vulcanization of polychloroprene

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

Vulcanizates of polychloroprene materials containing fluorinated polyolefin have a decreased rebound elasticity without having a significantly adverse effect on the mechanical properties.

Suitable polychloroprene materials for the production of high-damping

This invention relates to mixtures of polychloroprene elastomers which are distinguished by their good processibility and excellent cold resistance.

Mixtures of chloroprene polymers

The polymerization of chloroprene leads to non-colored products when a mixture of 2.0 to 5.0% by weight of a salt of disproportionated abietic acid and 0.1 to 1.0% by weight, in each case relative to the total amount of monomer, of a compound of the formula ##STR1## in which R.sub.1 and R.sub.2, independently of one another, denote hydrogen or CH.sub.3,

Process for polymerization of chloroprene

The combination of unmodified resinic acids and direct peptization in the production of sulfur-modified polychloroprene leads to a favorable ratio of elasticity to viscosity.

Process for the production of sulfur-modified polychloroprene

The invention relates to a polychloroprene rubber which shows advantages over the prior art in the sum total of its performance properties, namely vulcanization rate, tensile strength, elongation at break, modulus, tear propagation resistance and thermal stability of the vulcanizate.

Polychloroprene mixtures

Storage-stable polychloroprene is obtained, by aqueous emulsion polymerization, using xanthogen disulphides as molecular weight regulators, when a peptizing agent is added after the end of the polymerization.

Process for the preparation of polychloroprene

Gel-free polychloroprene is obtained, at high monomer conversions, using a polymerization initiator comprising sodium dithionite or a mixture of sodium dithionite with formamidinesulphinic acid or with potassium peroxydisulphate or with formamidinesulphinic acid and potassium peroxodisulphate or with potassium peroxodisulphate and sodium anthraquinon-.beta.-sulphonate or with formamidinesulphinic acid and potassium peroxodisulphate and sodium anthraquinone-.beta.-sulphonate, and in the presence of oxygen and a chain transfer agent when 30 to 90% of the initiator is present at the commencement of polymerization and the remainder is added in portions during the polymerization, only further sodium dithionite being added at a conversion &gt;60% in the case of an initiator combination, and when 20 to 80% by weight of the total amount of chain transfer agents is present before or at the commencement of polymerization and the remaining amount is added in one or more parts at monomer conversions of greater than 20%.

Polymerization of chloroprene

The production of polymers containing terminal halogen groups from cationically polymerizable monomers using a metal halide boiling below 50.degree. C. at normal pressure as catalyst and an organic halide corresponding to the following general formula ##STR1## in which X is halogen,

Process for the production of polymers containing reactive terminal

Polychloroprene rubbers having favorable processing behavior and excellent properties are obtained if mono-, di- or trichlorosubstituted polyisobutylene is added as plasticizer before vulcanization.

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Bergisch Gladbach, Germany

Rudiger Musch