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:
Apr. 26, 1977
Filed:
Apr. 29, 1975
Hilmar Roszinski, Hurth-Knapsack, DT;
Bernd Lippsmeier, Hurth-Knapsack, DT;
Gerhard Hartlapp, Hurth-Hermulheim, DT;
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Abstract
Production of pure dithiophosphoric acid O,O-diesters of the general formula ##STR1## in which the radicals R.sub.1 and R.sub.2, being identical or different, each stand for linear and/or branched alkyl, cycloalkyl, alkenyl, alkinyl, aralkyl or aryl radicals having from 1 to 18 carbon atoms, from their salts of the general formula: ##STR2## in which R.sub.1 and R.sub.2, respectively, have the meanings given hereinabove, M stands for a metal or ammonium cation, and n stands for the valency of the particular cation. The compounds are made by dissolving the salts in the quantity of one or more strong acids necessary to ensure reaction with the resultant formation of two separate liquid phases, and separating the two phases from one another.