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:
Feb. 03, 1981
Filed:
Nov. 29, 1978
Otsuka Chemical Co., Ltd., Osaka, JP;
Abstract
A process for preparing tri- and tetra-phosphonitrilic chlorides in a shortened period of time in high yields by reacting ammonium chloride with phosphorus pentachloride in an organic solvent inert to chlorine in the presence of at least one catalyst selected from metal oxides of Groups II-A, II-B, III-A, IV-A, IV-B and VIII of the Periodic Table, metal sulfides, metal salts of fatty acids, metal complexes, organometallic compounds and metal peroxides of Groups II-A and II-B of the Periodic Table, metal hydroxides of Groups III-A and VIII of the Periodic Table, and magnesium hydroxide. Phosphorus pentachloride may also be produced simultaneously with the reaction by reacting phosphorus trichloride employed instead of phosphorus pentachloride with chlorine gas supplied into the reaction system, or by previously reacting phosphorus employed instead of phosphorus pentachloride with chlorine gas supplied into the reaction system to produce phosphorus trichloride and then reacting phosphorus trichloride with chlorine gas in the same manner as in the case using phosphorus trichloride as the starting material.