Process for preparing dialkylphosphinic acids

US6329544A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventors

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

Key dates

• Filing date: Mar 10, 2000
• Grant date: Dec 11, 2001
• Expiry date: Mar 10, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/30
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing dialkylphosphinic acids and/or alkali metal salts thereof by reacting olefins with alkylphosphonous and/or hypophosphorous acid and/or alkali metal salts thereof, which comprises carrying out the reaction in the presence of a azo free-radical initiator. The invention also relates to the use of the products prepared by the abovementioned process for preparing flame retardants.