反应详情

First, 70 parts by weight of 2-ethylhexyl acrylate (which may hereinafter be referred to as “2-EHA”) as the monomer (a), 10 parts by weight of N-hydroxyethylacrylamide (which may hereinafter be referred to as “HEAA”) as the monomer (b), 20 parts by weight of N-vinyl-2-pyrrolidone (which may hereinafter be referred to as “N-VP”) as the monomer (c), and 333.3 parts by weight of ethyl acetate as a solvent were loaded into a reaction vessel provided with a cooling tube, a nitrogen gas-introducing tube, a temperature gauge, a dropping funnel, and a stirring machine, and then the contents were stirred at room temperature for 1 hour while nitrogen gas bubbling (100 mL/min) was performed. After that, the contents in the reaction vessel were heated, and 0.2 part by weight of 2,2′-azobisisobutyronitrile (AIBN) as a polymerization initiator was added when the temperature of the contents reached 60° C. Such control that the temperature of the contents was kept at 60° C. was performed, and then polymerization was performed in a stream of a nitrogen gas for 6 hours. Next, the temperature was held at 76° C. for 15 hours. A solution of an acrylic copolymer (2-EHA/HEAA/N-VP=70/10/20) was obtained by solution polymerization based on the above-mentioned system.

1. customwere loaded into a reaction vessel
2. customprovided with a cooling tube, a nitrogen gas-introducing tube
3. custombubbling (100 mL/min)
4. temperatureAfter that, the contents in the reaction vessel were heated
5. addition0.2 part by weight of 2,2′-azobisisobutyronitrile (AIBN) as a polymerization initiator was added when the temperature of the contents
6. customreached 60° C
7. customwas kept at 60° C.
8. custompolymerization
9. waitwas performed in a stream of a nitrogen gas for 6 hours
10. waitNext, the temperature was held at 76° C. for 15 hours