Hoechst Aktiengesellschaft

Clariant Corporation

Cassella Aktiengesellschaft

Heinz Wittkus

Martin Hille

Ulrich Riegel

Friedrich Engelhardt

Frank Weinelt

Werner Reimann

Fritz Engelhardt

Hans Jurgen Scholz

Bernd Windhausen

Wolfgang Friede

The present invention relates to environmentally friendly diesel fuel, containing natural, liquid triglycerides of natural or animal origin, such as rapeseed or soybean oil, and acetals of the formula (I) or (II) ##STR1## in which the substitutents have the meaning defined in the description. This diesel fuel is biodegradable and free of sulfur, nitrogen and aromatics.

Environmentally friendly diesel fuel

The invention relates to mixtures comprising acetals and oleophilic alcohols and/or oleophilic esters which are suitable for the preparation of inverted emulsion drilling muds and emulsion drilling muds. They completely or partly replace here the base oils, diesel oil, purified diesel oil, white oil, olefins and alkylbenzenes known to date. The invention furthermore relates to the use of the inverted emulsion drilling mud and emulsion drilling mud as claimed in claim 10.

Use of acetal-containing mixtures

Acetals are used as a mineral oil substitute, oil component or base oil in invert-emulsion drilling muds, emulsion drilling muds, engine oils, gearbox oils, lubricating oils and also metal-working fluids, coolants, cooling lubricants and hydraulic fluids. As compared with conventional mineral oils, acetals show good biodegradability and are less toxic.

Use of acetals

The water-soluble copolymer comprises 5-90% by weight of groups of the formula ##STR1## in which R.sup.1 is hydrogen or methyl, R.sup.2 is C.sub.2 -C.sub.10 -alkylene, and Me is ammonium or an alkali metal, 5-90% by weight of groups of the formula

Water-soluble copolymers useful in drilling fluids

Cement slurries for deep holes, with a content of copolymers which are composed of 5-95% by weight of groups of the formula ##STR1## in which R.sub.1 is hydrogen or methyl,

Cement slurries for deep holes, with a copolymer content for reducing

Outstandingly suitable drilling mud additives are water soluble copolymers consisting essentially of a random distribution of

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Frankfurt am Main, Germany

Heinz Wittkus