Chemische Werke Huels Aktiengesellschaft

Friedrich Heinrich

Werner Otte

Hans-Josef Ratajczak

Gerhard Franz

Jorg Dorffel

Erhard Lange

A naphtha-soluble, hydrogenated C.sub.1-4 -alkyl C.sub.6-10 -aryl ketone/formaldehyde resin, having an oxygen content of at least 6% by weight and a softening point of at least 70.degree. C. can be produced by a process comprising the step of hydrogenating a C.sub.1-4 -alkyl C.sub.6-10 -aryl ketone/formaldehyde resin under a hydrogen pressure of at least 200 bar and a temperature of 140.degree.-300.degree. C., in the presence of a nickel, palladium, palladium/copper or palladium/nickel catalyst. These resins are useful, for example, as additives to improve the hardness of varnishes and other coatings.

Naphtha-soluble, hydrogenated alkyl aryl ketone/formaldehyde resins and

A process for the catalytic skeleton isomerization of n-alkenes to isoalkenes comprises contacting the n-alkene with a fluorinated aluminum oxide as the catalyst at temperatures of 250.degree.-550.degree. C., in the presence of 0.5-150% by weight of water, based on the weight of the alkene employed and replenishing the fluorine discharged from the catalyst in metered amounts, continuously or discontinuously, using, e.g., a volatile fluorine compound. The catalyst, partially deactivated by coking, is regenerated by burning it off with an oxygen-containing gas in the presence of steam.

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Marl, Germany

Friedrich Heinrich