Bayer Aktiengesellschaft

Heinrich Wolfers

Hans Rudolph

Hans J Rosenkranz

Heinrich Alberts

Fritz Mietzsch

Thomas Elsner

Wolfram Mayer

Oskar Walter

Manfred Schutte

Hans-Jurgen Rosenkranz

Wulf Wendeborn

Mosquito coils are resistant to breakage, light, flat and ensure a good active substance yield if they consist of a wood-chip and/or fiber material of a density of only 0.4 to 0.7 kg/dm.sup.3 and preferably have a thickness of 1 to 4.5 mm, the active substance being applied to the spiral (1) as a layer (2).

Mosquito coil and process for producing mosquito coils

Ethers of 1,2-disubstituted tartaric acid esters proved to be excellent initiators for thermally initiatable radical polymerization reactions. They show a high reactivity even in low concentrations and yield thoroughly hardened products.

Substituted tartaric acid esters, a process for their production and

Substituted tartaric acids and tartaric acid derivatives have proved to be highly reactive initiators for starting radical polymerization resp. hardening reactions of unsaturated compounds and mixtures of compounds, particularly unsaturated polyester resins.

Radical polymerization in the presence of substituted tartaric acid or

A process for the copolymerization of ethylene at pressures of from 200 to 3500 atms and temperatures of from 130.degree. to 300.degree. C., wherein silyl ethers are used as initiators.

Process for the polymerization of ethylene in the presence of silyl

A process for the polymerization of ethylene and optionally further .alpha.,.beta.-unsaturated monomers at temperatures of from 100.degree. to 350.degree. C. and at pressures of from 600 to 3500 in the presence of 1,2 diaryl glycols atoms or 1,2-diaryl glycol alkyl ethers as initiators.

Process for the polymerization of ethylene in the presence of diaryl

Amines, amides and amidines work as accelerators for polymerization reactions with initiators of the 1.2-diphenyl ethane type.

Accelerators for radical polymerization reactions with initiators free

Mixtures active as initiators for radical polymerization reactions comprising

Peroxide initiators

An improvement in a process for the preparation of a pinacol of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and represent optionally substituted aliphatic, cycloaliphatic, araliphatic or an aromatic hydrocarbon radical by reducing a ketone of the formula ##STR2## wherein R.sup.1 and R.sup.2 have the abovementioned meanings with a base metal, the improvement comprising carrying out the reduction in the presence of an organic halogen compound and in the presence of a phosphoric acid amide, phosphoric acid ester and/or carboxylic acid amide.

Process for the preparation of pinacols

Mixtures obtained by reaction of an .alpha.-arylketone or of an arylaldehyde and the equivalent amount of a base metal in an inert aprotic solvent with a di-, tri- or tetrachlorosilane or a chlorinated polyorganosilane or -siloxane work as initiators for free radical-initiated polymerization reactions.

Reaction mixtures, processes for their preparation and their use as

Certain new monosilyl ethers have virtually no effect on the storage stability of unsaturated polyester resins at temperatures up to 70.degree. C, but at higher temperatures effect rapid curing to give polymers which are substantially monomer-free.

Growing community of inventors

Rheurdt, Germany

Heinrich Wolfers