Inhibition of polymerization of unsaturated monomers

US6660181B2 · kind B2 · utility

Assignee

• Crompton Corporation · US

Inventors

• Brigitte Benage · Wolcott, US
• Angela M. Edwards · Middlebury, US
• Vilen Kosover · Cheshire, US
• Gan Wang · Wallingford, US
• Anthony Gentile · Waterbury, US
• Jesus R. Fabian · Wethersfield, US
• Gerald J. Abruscato · Southington, US

Key dates

• Filing date: Jul 12, 2002
• Grant date: Dec 9, 2003
• Expiry date: Jul 12, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D211/94
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method is disclosed for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers a polymerization inhibiting amount of a mixture comprisingA) a first inhibitor comprising 4-amino-2,2,6,6-tetramethylpiperidinyloxy, wherein said amino group is a primary, secondary, or tertiary amino group; andB) at least one other inhibitor having the structural formula: wherein:R1 and R4 are independently selected from the group consisting of hydrogen, alkyl, and heteroatom-substituted alkyl;R2 and R3 are independently selected from the group consisting of alkyl and heteroatom-substituted alkyl;X1 and X2 (1) are independently selected alkyl groups of 1 to 15 carbon atoms or (2) taken together, form a ring structure with the nitrogen.