| abstract |
PROBLEM TO BE SOLVED: To provide an excellent polymerization prevention method for α, β-unsaturated carboxylic acids and esters thereof. SOLUTION: As a polymerization inhibitor, the following general formula (1): (Wherein R 1 is CH 2 , CHOH, C ＝ O, CHOCOC H 3 , CHNHCOCH 3 or CHOCH 3 ) and an N-oxyl compound represented by the following general formula (2): (Wherein R 2 is CH 2 , CHOH, C ＝ O, CHOCOC A hydroxylamine compound represented by H 3 , CHNHCOCH 3 or CHOCH 3 ) in α, β-unsaturated carboxylic acid and / or α, β-unsaturated carboxylic acid ester. For preventing polymerization of .beta.-unsaturated carboxylic acids and esters thereof. |