Imperial Chemical Industries Limited

Gwilym R Davies

Alfred Glyn Williams

Guy Q Maling

A saturated or unsaturated fluorocarbon is produced by electrolytic reduction of a saturated fluorocarbon containing at least on atom of chlorine or bromine in an electrolytic cell having a low hydrogen overpotential cathode. The cathode is preferably stainless steel, and the fluorocarbon which is produced is preferably a fluorohydrocarbon.

Electrochemical process for producing saturated or unsaturated

A multiple print head for a continuous ink jet printer has its individual ink jets produced by an electrostatic field as an array of cusps along a straight edge to which the ink is continuously supplied. The straight edge is produced by folding an electrically conductive foil to give a surface less prone to corona discharges.

Multi-jet ink jet printer

Tetrahalobenzene compounds of the formula (IX): ##STR1## in which each X is independently chloro or fluoro, are prepared by electrolyzing in a protic medium a compound of the formula (IV): ##STR2## in which X has the meaning already given, each R is independently C.sub.1-4 alkyl and A is a radical capable of forming an anion A.sup.-. The compounds are useful in the synthesis of insecticides.

Method of preparing tetrahalobenzene compounds

A process for the production of epoxides of the formula (I): ##STR1## in which the benzene ring A is substituted with 1 to 3 halogen atoms, which are the same or different, and optionally carries other substituents, and R.sup.1 is ##STR2## which is the same as or different from the other group ##STR3## or C.sub.1-6 alkyl, the process comprising electrolyzing the corresponding alkene of the formula (II): ##STR4## in a medium comprising a solvent for the alkene and an aqueous solution of a halogen salt, the solvent/water ratio by weight being greater than unity, the solvent being miscible with water at the solvent/water ratio used and being chemically inert to both the alkene and the free halogen produced from the halogen salt by the electrolysis. The epoxides are useful in the synthesis of fungicidal compounds and certain of the epoxides are novel compounds.

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Gwilym R Davies