Chemtura Corporation

Crompton Gmbh

Jesus A Fabian

Gerald J Abruscato

Brigitte Benage

Vilan Kosover

Istvan Lippai

A method for inhibiting the premature polymerization of styrenic monomers is disclosed wherein the method comprises adding to said monomers a combination of:

Means for controlling the exothermic reaction of styrenic monomers with sulfonic acids

Disclosed herein is a method for inhibiting and retarding the premature polymerization and the polymer growth of vinyl aromatic monomers wherein the method comprises adding to said monomers an effective amount of an inhibitor and retarder blend comprising:

Aromatic sulfonic acids, amines, and nitrophenols in combination with nitroxyl radical-containing compounds or C-nitrosanilines as polymerization inhibitors

Disclosed herein is a method for inhibiting and retarding the premature polymerization and the polymer growth of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of at least one inhibitor that is a sulfonated nitrophenol of the formula: wherein: R, R, and Rare independently selected from the group consisting of hydrogen, alkyl, NO, and SOH, provided that at least one of R, R, and Ris NOand at least one of R, R, and Ris SOH. In a preferred embodiment, at least one additional inhibitor selected from the group consisting of nitroxyl compounds, nitrosoanilines, nitrophenols, amines, and mixtures thereof is also added.

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Wethersfield, CT, United States of America

Jesus A Fabian