Diaminoalkyl quaternary ammonium salts and method for their preparation and use

US5821322A · kind A · utility

Assignee

• General Electric Company · US

Inventors

• Daniel J. Brunelle · Scotia, US
• Peter D. Phelps · Schenectady, US
• Eugene Pauling Boden · Scotia, US
• Mark Erik Nelson · Minnetonka, US
• Larry I. Flowers · Evansville, US
• Paul Dean Sybert · Evansville, US
• Erik Hendrick Adriaan Capelle · Tholen, NL

Key dates

• Filing date: May 5, 1997
• Grant date: Oct 13, 1998
• Expiry date: May 5, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/24
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Diaminoalkyl quaternary ammonium salts are prepared by the reaction of alkyl halides with tertiary diamines having C.sub.2-20 primary alkyl radicals attached to nitrogen and an alkyl radical between the two nitrogen atoms in which at least three carbon atoms separate said nitrogen atoms. Said salts are preferably substantially free from corresponding diamines. They are useful as catalysts for interfacial polycarbonate preparation by the reaction of phosgene with at least one dihydroxyaromatic compound. Polycarbonate preparation using such catalysts is economical in phosgene consumption, is accompanied by a rapid conversion of chloroformate groups to desirable species and affords a product with a very low proportion of unreacted dihydroxyaromatic compound.