Evonik Degussa Gmbh

Huls Aktiengesellschaft

Frank Kraushaar

Manfred Neumann

Phillip R James

Oliver Erpeldinger

Stefanie Weyler

Jaroslaw Monkiewicz

Horst Pennewiss

Roland Streck

Hans Guenther Wey

Felix Nissen

Stefanie Rinker

Michael Stehr

Dirk Hoppe

An olefinically unsaturated monomer is stabilized by a retarder-containing composition which comprises a solvent and a quinone methide as a retarder.

Process for stabilizing olefinically unsaturated monomers

A method for preparing a substituted 1,4-quinone methide from a 3,5-disubstituted 4-hydroxybenzaldehyde is provided. Also provided is a method to prepare a 3,5-disubstituted 4-hydroxybenzaldehyde from the corresponding 2,6-disubstituted phenol.

Process for preparing substituted 1,4-quinone methides

The invention relates to the use of polymethylalkanes having terminal methyl groups and methylene and ethylidene groups of the formula I ##STR1## in which the total number of C atoms n+2 m+2 is 20 to 100 and the ratio of the methyl and methylene groups to the ethylidene groups is 3 to 20:1 and the ethylidene groups are always separated by at least one methylene group, as biodegradable base oils for lubricants and functional fluids. Suitable polymethylalkanes are obtained by oligomerization of .alpha.,.omega.-diolefins, for example in particular according to P 41 19 332.6, or by pyrolysis of ethene/propane copolymers and subsequent hydrogenation in each case. The polymethylalkanes can be combined with conventional additives and other degradable or non-degradable base oils.

Use of polymethylalkanes as biodegradable base oils in lubricants and

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Essen, Germany

Frank Kraushaar