Bayer Aktiengesellschaft

Theo Kempermann

Ernst Roos

Rudiger Schubart

Manfred Abele

Ulrich Eholzer

Thomas Scholl

Wolfgang Kremer

Paul Uhrhan

Hans J Kreuder

Gunter Marwede

Werner Jeblick

Bernd Peltzer

Reinhard Preuss

Hermann Fries

Johannes Beckers

Manfred Pieroth

Gunter P Langner

Wolfgang Redetzky

The strength of the bond between a metal and vulcanized rubber may be increased by a bonding agent containing at least one organic cobalt compound and at least one boric acid ester.

Process for the preparation of rubber/metal composite materials with a

Phenolic resins obtained by condensation from alkylphenol, aldehyde, polyamine and polyether in a molar ratio of 1:0.7 to 1.3:0.005 to 0.2:0.001 to 0.3 are suitable as tackifiers for rubber mixtures.

Phenolic resins using polyamines and polyethers in their production

Vulcanization system, rubber mixture containing said system and a

A mixture comprising sulphur or a sulphur donor, a mercapto- or sulfenamide vulcanization accelerator, a compound containing a thiophenyl radical and a standard auxiliary accelerator is used as a vulcanization system for natural or synthetic rubber.

Vulcanization system, a rubber mixture containing this vulcanization

A mixture of azodicarbonamide and an .alpha.-amidosulphone corresponding to the general formula: ##STR1## in which R represents hydrogen, a C.sub.1 -C.sub.4 -alkyl residue and/or halogen,

Mixtures of azodicarbonamide and .alpha.-amidosulphones and their

Cyclic acetals which may be obtained by reacting tri- to hexa-ols with tetrahydrobenzaldehydes can be used as non-discoloring stabilizers for natural and/or synthetic rubber against ozone attack.

Cyclic acetals of polyols, their production and their use as

Sulphenamides are obtained by reacting N-chlorothiophthalimide with compounds containing one or two olefinic double bonds. These products retard vulcanization of natural or synthetic rubber.

Sulphenamides, their production and their use as vulcanization retarders

Alkyd resin lacquers which contain cellulose nitric acid esters can be prevented from 'lifting' and yellowing by the addition of bis-[hydroxyphenyl]-alkanes which are substituted in the nucleus.

Nitrocellulose alkyd resin lacquers containing

A vulcanization system for natural and/or synthetic rubber containing light fillers comprising certain silanes, thiazoles, guanidines, and thiurams. By using this system the extremely unpleasant odor of silanes when used alone can be substantially diminished without affecting the properties of the vulcanizate.

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Cologne, Germany

Theo Kempermann