Sulfonated phenols with nitrophenols as polymerization...

C - Chemistry – Metallurgy – 07 – C

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C07C 7/20 (2006.01) C07C 309/42 (2006.01)

Patent

CA 2581526

Disclosed herein is a method for inhibiting the premature polymerization and the polymer growth of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of a combination of (A) at least one inhibitor that is a sulfonated phenol of the formula (I): wherein (1) R2 is selected from the group consisting of hydrogen and hydrocarbyl; and (2) R1 and R3 are independently selected from the group consisting of hydrogen and SO3H, provided that at least one of R1 and R3 is SO3H; (B) at least one inhibitor that is a nitrophenol; and, optionally, (C) an inhibitor selected from the group consisting of nitroxyl compounds and nitrosoanilines; and (D) an amine.

L'invention concerne un procédé qui permet d'inhiber la polymérisation prématurée ainsi que la croissance polymérique de monomères éthyléniquement insaturés. Ce procédé consiste à ajouter auxdits monomères une quantité efficace d'une combinaison de (A) au moins un inhibiteur qui est un phénol sulfoné représenté par la formule (I): dans laquelle (1) R2 est choisi dans le groupe constitué par hydrogène et hydrocarbyl; et (2) R1 et R3 sont individuellement choisi dans le groupe constitué par hydrogène et SO3H, à condition que au moins R1 et/ou R3 représente SO3H; (B) au moins un inhibiteur qui est le nitrophénol; et, éventuellement, (C) un inhibiteur sélectionné dans le groupe constitué par des composés de nitroxyle et de nitrosoanilines; et (D) une amine.

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