N-oxyl radicals

US6639033B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Susanne Brinkmann-Rengel · Ober-Olm, DE
• Sylke Haremza · Neckargemünd, DE
• Heinz Friedrich Sutoris · Bischofswerda, DE
• David Christie · Mannheim, DE
• Roman Benedikt Raether · Speyer, DE
• Jizhuang Cao · Shanghai, CN

Key dates

• Filing date: Feb 19, 2002
• Grant date: Oct 28, 2003
• Expiry date: Feb 19, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K15/30
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention provides a process for the free radical polymerization of one or more ethylenically unsaturated monomers, said process comprising polymerizing one or more ethylenically unsaturated monomers in the presence of one or more N-oxyl radicals of formula II, whereinX is S, NR5, O, SO or SO2,R5 is C1-C20-alkyl or C5-C8-cycloalkyl andR3 and R4 independently of one another, are C1-C4-alkyl, phenyl, naphthyl or an aromatic five-membered ring, or R3 and R4 together are —(CH2)o— and p and o, independently of one another, are an integer from 2 to 7.