Bayer Aktiengesellschaft

Continental Aktiengesellschaft

Peter Wendling

Werner Obrecht

Eberhard Muller

Thomas Scholl

Rudiger Musch

Wilhelm Gobel

Ulrich Eisele

Gerhard Hohmann

Rudolf Casper

Wolfgang Konter

Michael Well

Victor Monroy

Adolf Schmidt

Hermann-Josef Weidenhaupt

Hans Magg

Gottfried Pampus

Winfried Jeske

Hans-Wilhelm Engels

J&uuml;rgen Trimbach

Roland Parg

Christiane Oppenheimer-Stix

Andreas Bischoff

Michael Happ

Hans-Rafael Winkelbach

Heinrich K&ouml;nigshofen

Hans Christian Strauch

Luigi Marinelli

Jürgen Wassen

Heinz-Hermann Greve

Jean-Pierre Lambert

Bernd Stollfuss

Robert H Schuster

The present invention relates to a process for reducing mold contamination in an injection molding process by using a mixture of nitrile rubbers, in the range of from 0.1-0.5 wt. % of fatty acids and optionally further additives.

Nitrile rubber mixtures with a low tendency towards mold contamination

The present invention relates to a process for the production of rubber mixtures containing 1 to 500 parts by weight of one or more water-repellent fillers with a methanol wettability of &gE;5 wt. % to 100 parts by weight of rubber, characterized in that said water-repellent fillers are blended with one or more rubber latices and the mixture is then processes jointly, and also to rubber mixtures that can be produced with this process. The present invention relates furthermore to the use of the rubber mixtures produced by the process according to the invention for the production of tires, treads or molded articles of all kinds.

Emulsion rubber mixtures containing hydrophobic-rendered oxide or silicate type fillers and their use for producing tires

Hydrophobic, oxidic and/or siliceous fillers obtainable by treating an oxidic and/or siliceous filler with 0.1 to 50 parts by weight, per 100 parts by weight of filler, with an adduct of sulfur and unsaturated primary and/or secondary alcohols with 3 to 60 carbon atoms at temperatures of 20 to 250&deg; C., wherein the adduct has been obtained by reacting 1 to 10 moles of sulfur per mole of double bonds in the alcohol.

Hydrophobic, oxidic or siliceous fillers and their use

Rubber composition, method of formulating and blending the same and article and tires made therefrom

A rubber composition which contains a rubber mixture that can be vulcanized with a vulcanizing agent, which includes at least one rubber component, at least one filler having nucleophilic groups, gel particles comprising a rubber, having a particle size between about 3&times;10,and about 1&times;10,m and a swelling index in toluene of about 1 to about 15 and whose surface has electrophilic centers, and a substance acting as a coupling agent between the filler having nucleophilic groups and the additional filler, the substance acting as a coupling agent having the following structure: X&mdash;R,&mdash;Si&mdash;(R,),, wherein X is a nucleophilic group, R,is an alkyl group having up to about 6 carbon atoms or a phenyl group, and R,may be the same as or different from each other and from R,and is an alkyl or alkoxy group having up to 6 carbon atoms and at least one of R,is an alkoxy group. The rubber composition has improved hysteresis behavior in the vulcanized state so that with the use of this rubber composition in tires, the rolling resistance is reduced and the wet slippage behavior is improved in relation to conventional rubber compositions. A method of adding and blending the rubber composition as well as a composition useful for tire treads and vehicle tires containing the composition are disclosed.

Rubber composition, method of adding and blending the composition and vehicle tire made from the composition

A rubber composition, which contains a rubber mixture that can be vulcanized with a vulcanizing agent, which includes at least one rubber component, at least one filler, gel particles comprising a rubber, having a particle size between about 3.times.10.sup.-9 and about 1.times.10.sup.-6 m and a swelling index in toluene of about 1 to about 15 and whose surface has electrophilic centers, and a substance which acts as a coupling agent between the gel particles and which has the structure A--R--A, wherein A is a nucleophilic group, and R is a saturated or unsaturated hydrocarbon group. The rubber composition has improved hysteresis behavior in the vulcanized state so that when this rubber composition is used in tires, the rolling resistance is reduced and the wet slippage behavior is improved in relation to the conventional rubber compositions. A method of formulating the rubber composition as well as a composition useful for tire treads and vehicle tires containing the composition are disclosed.

Rubber composition, method of formulating the composition and vehicle

Rubber mixtures prepared from at least one styrene/butadiene rubber gel and at least one rubber which contains double bonds and optionally further fillers and rubber auxiliary substances are in particular suitable for the preparation of vulcanizates having unusually high damping at temperatures of from -20 to +20.degree. C. as well as unusually low damping at temperatures of from 40 to 80.degree. C. The rubber mixtures may therefore be used, for example, to manufacture vehicle tires which grip in the wet and have low rolling resistance.

Rubber mixtures which contain SBR rubber gels

Mixtures of A) polybutadiene gel and B) other rubbers containing C.dbd.C double bonds, the quantity of polybutadiene gel A), based on the sum of A)+B), being 1 to 70% by weight, show as vulcanizates a favorable combination of the properties hysteresis loss and abrasion resistance.

Rubber mixtures containing polybutadiene gel

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

Rubber mixtures containing so-called 'pre-crosslinked' polychloroprene give vulcanizates having an improved combination of low rolling resistance and low abrasion.

Rubber mixtures containing sulfur-modified polychloroprene gel

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

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

Toluene-soluble, sulphur-modified polychloroprene is obtained by emulsion copolymerization of chloroprene, sulphur and optionally further monomers which are copolymerizable with chloroprene and sulphur using a peroxy activator and subsequent working-up by stabilizing, stopping, degassing and isolating without separate peptization, in that polymerization is carried out in the presence of dithiocarbamates and/or xanthogenates and the activator is metered in continuously or batch-wise during the course of polymerization.

Process for the production of toluene-soluble, sulphur-modified

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, using a polymerization initiator comprising a mixture of

Growing community of inventors

Leverkusen, Germany

Peter Wendling