Bayer Aktiengesellschaft

Werner Jeblick

Ernst Roos

Lothar Ruetz

Dieter W Bruck

Helmut Hurnik

Helmut Fiege

Lothar Puppe

Heinrich Konigshofen

Alfons Klein

Theo Kempermann

Manfred Abele

Lother Ruetz

Manfred Finzenhagen

4-Methyl-2-cyclohexylphenol can be prepared by alkylation of p-cresol with cyclohexanol or cyclohexene by performing the reaction in the liquid phase in the presence of 1-10% by weight, based on the amount of p-cresol, of a large pore, acidic zeolite.

Preparation of 4-methyl-2-cyclohexylphenol

The invention relates to a new blowing agent combination based on azodicarbonamide, production thereof and use thereof for foaming polymers.

New blowing agent combination based on azodicarbonamide, production

Enol ethers corresponding to the following general formula ##STR1## are suitable as non-discoloring ozone protective agents for rubber.

Process for increasing the ozone-resistance of a rubber with enol ethers

Condensation products of a diol with aldehydes corresponding to the following formula: ##STR1## in which R represents hydrogen or methyl, the methyl group being in the 3- and/or 4-position, and Y represents the number 0 or 1, a process for its production characterized in that diols are reacted with aldehyde compounds in known manner, and its use as an antiozonant for rubber.

Cyclic acetals of diols, their production of their use as

The ozone-resistance of natural and synthetic rubber is increased when an enol ether of the formula ##STR1## is incorporated.

Process for increasing the ozone-resistance of a rubber

The use of open-chain acetals or ketals corresponding to the following general formula ##STR1## as non-discoloring anti-ozonants for natural and/or synthetic rubber.

Open-chain acetals or ketals as non-discoloring antiozonants for rubber

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

A blowing agent combination comprising azodicarbonamide, zinc oxide and a benzenethiol sulphonic acid derivative having the general formula (I) ##STR1## wherein R is a hydrogen atom, a C.sub.1 -C.sub.4 alkyl radical and/or a chlorine atom,

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Leverkusen, Germany

Werner Jeblick