Inhibition of polymerization of vinylaromatic or vinylaliphatic

US5888356A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Thomas Keil · Marl, DE
• Manfred Kaufhold · Marl, DE
• Bernd Helpap · Recklinghausen, DE

Key dates

• Filing date: Oct 7, 1997
• Grant date: Mar 30, 1999
• Expiry date: Oct 7, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S585/952
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The polymerization of a vinylaromatic or vinylaliphatic compound at elevated temperature in the absence of air is inhibited by processing the vinylaromatic or vinylaliphatic compound in the presence of 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl or 4-acetylamino-2,2,6,6-tetramethylpiperidine-N-oxylalone or in admixture with p-nitrosophenol or 2-methyl-4-nitrosophenol.