The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 1991
Filed:
Mar. 16, 1989
Steffen Dapperheld, Kriftel, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Process for the preparation of unsaturated halogenated hydrocarbons of the formula R.sup.1 --CR.sup.2 .dbd.CR.sup.2 --R.sup.2 in which R.sup.1 and R.sup.2 independently of one another are hydrogen, chlorine or fluorine, R.sup.2 is also --C(R.sup.1).sub.2 --R.sup.3 or the grouping [C(R.sup.1).sub.2 ].sub.m --C(R.sup.1).sub.2 represents two of the radicals R.sup.2, by electrolysis in the presence of certain onium compounds and metal salts, the electrolysis cells being divided or undivided. The process can be carried out continuously or discontinuously under atmospheric pressure or under an elevated pressure up to 10 bar and at temperatures from -40.degree. C. up to the boiling point of the electrolyte; the current density is in the range from 1 to 600 mA/cm.sup.2. The cathode is generally composed of carbon material. The products obtained are suitable for use as starting materials for the preparation of polymers containing fluorine.