Methacrylic Acid → Methacrylic Acid

Participants

Reaction Conditions

Reaction Steps

In a 2-liter three-neck flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen gas introduction tube, 560.0 g of methyl ethyl ketone were placed and the surrounding temperature of the reaction container was increased to 87° C. While maintaining the refluxed state in the reaction container (refluxed until the reaction was completed), a mixed solution of 429.2 g of methyl methacrylate, 87.0 g of benzyl methacrylate, 29.0 g of PME-1000 (trade name, methoxypolyethylene glycol methacrylate (n=23), available from NOF Corporation), 34.8 g of methacrylic acid, 108.0 g of methyl ethyl ketone and 2.32 g of V-601 (trade name, available from Wako Pure Chemical Industries, Ltd.) was dropped therein at a constant rate so that the dropping was completed in 2 hours. After the completion of dropping, the mixture was stirred for 1 hour, and thereafter (1): a solution of 1.16 g of V-601 and 6.4 g of methyl ethyl ketone was further added and stirred for 2 hours. Subsequently, the process (1) was repeated 4 times, and a solution of 1.16 g of V-601 and 6.4 g of methyl ethyl ketone was further added and stirred for 3 hours. A resin solution of methyl methacrylate/benzyl methacrylate/PME-1000/methacrylic acid (=74/15/5/6 [mass ratio]) copolymer was thus obtained.

Provenance & Evidence