Patent ID: 6409887
Filing Date: 2002-06-25
Classification: C07B,C07C,Y10S

Abstract:
A monomer composition, stabilised against premature polymerisation, comprising:a) an ethylenically unsaturated monomer or mixture of monomers polymerisable by free radical initiation, and b) an effective amount, sufficient to inhibit premature polymerisation of component (a) of a mixture of: i) 1 to 99% by weight, based on the total weight of components (i) and (ii) of a mixture of at least one aromatic amine and at least one organic acid in a molar ratio of 10:1 to 1:10, and ii) 99 to 1% by weight based on the total weight of components (i) and (ii) of at least one stable radical compound, wherein the aromatic amine is selected from the group consisting of 3,5-ditertiarybutyl-4-oxy, N,N-dimethylbenzlamine; 1,4-phenylenediamine; and N,Nâ€²-bis-(1,4dimethylpentyl)-1,4-phenylenediamine; wherein the organic acid is a carboxylic acid; and wherein the stable radical compound is a sterically hindered nitroxyl selected from 1-oxyl-2,2,6,6-tetramethylpiperidin-4-ol, 1-oxyl 2,2,6,6-tetramethylpiperidin-4-one, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl acetate, 1-oxyl 2,2,6,6-tetramethylpiperidin-4-yl sterate, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl benzoate, 1-oxyl 2,2,6,6-tetramethylpiperidin-4-yl 4-tert-butykbenzoate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) succinate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4yl) sebacate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl benzoate) adipate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) n-butylmalonate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) phthalate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) isophthalate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl)terephthalate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) hexahydoterephthalate, N,Nâ€²-bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) adipamine, and N-(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) caprolactam.