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:
Sep. 15, 1992
Filed:
Mar. 06, 1991
Rudolf Schumann, Raguhn, DE;
Chemie AG Bitterfeld-Wolfen, Bitterfeld, DE;
Abstract
The invention relates to a method for stabilizing phosphorus trichloride. In order to delay the formation of phosphorus oxychloride in phosphorus trichloride and to reduce it to a minimum value which no longer adversely affects further processing, one or more amines which have at least two aromatic hydrocarbon groups linked to one nitrogen atom, such as diphenylamine, phenothiazine, phenyl-4-methylphenylamine and triphenylamine, are added to the phosphorus trichloride. The amines can also be added in the form of their salts, including their quaternary ammonium compounds, or their reaction products with phosphorus halides. The amounts of amines, added fall within the range of 10.sup.-6 % to 10.sup.-1 %, based on the amount of phosphorus trichloride.