Process for preparing metal salts of arylalkylphosphinic acids

US6232493A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventors

• Norbert Weferling · Hürth, DE
• Hans-Peter Schmitz · Mönchengladbach, DE

Key dates

• Filing date: Nov 24, 1998
• Grant date: May 15, 2001
• Expiry date: Nov 24, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/304
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing metal salts of arylalkylphosphinic acids, which comprises: PA1 a) reacting olefins with arylphosphonous acids or alkali metal salts thereof in the presence of a cationic free-radical initiator, and PA1 b) reacting the arylalkylphosphinic acids or alkali metal salts thereof obtained by a) with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K to give the metal arylalkylphosphinate salts. The invention also relates to the use of the products prepared by the abovementioned process for preparing flame retardants.