Methacrylic Acid → Methyl methacrylate isobornyl methacrylate methacrylic acid

Participants

Reaction Conditions

Reaction Steps

540.0 g of methyl ethyl ketone was introduced into a 2-L three-necked flask equipped with a mechanical stirrer, a thermometer, a reflux cooling tube and a nitrogen gas inlet tube, and the temperature of the content was raised to 75° C. While the temperature inside the reaction vessel was maintained at 75° C., a mixed solution containing 216.0 g of methyl methacrylate, 270.0 g of isobornyl methacrylate, 54.0 g of methacrylic acid, 108 g of methyl ethyl ketone, and 2.16 g of “V-601” (trade name, manufactured by Wako Pure Chemical Industries, Ltd.; polymerization initiator), was added dropwise to the reaction vessel at a constant rate so that the dropwise addition was completed in 2 hours. After completion of the dropwise addition, a solution containing 1.08 g of “V-601” and 15.0 g of methyl ethyl ketone was added to the flask, and the mixture was stirred for 2 hours at 75° C. Subsequently, a solution containing 0.54 g of “V-601” and 15.0 g of methyl ethyl ketone was further added to the flask, and the mixture was stirred for 2 hours at 75° C. Subsequently, the mixture was heated to 85° C. and was continuously stirred for another 2 hours. Thus, a resin solution of a methyl methacrylate/isobornyl methacrylate/methacrylic acid (=40/50/10 [mass ratio]) copolymer was obtained.

Provenance & Evidence