反应详情

768 g of water and 12 g of anhydrous sodium sulfate were charged in a 2 L reactor equipped with a stirrer, a thermometer, a N2 gas introduction pipe, a reflux condenser and a dropping funnel, and the interior was purged with N2 gas for deoxidation. Subsequently, 1 g of a partially saponified polyvinyl alcohol (saponification degree: 88%) and 1 g of lauryl peroxide were charged and the inside temperature was elevated to 60° C. After that, monomers consisting of 104 g (1.209 mol) of methyl acrylate and 155 g (1.802 mol) of vinyl acetate were dropped through a dropping funnel over 4 hours. In the course of dropping polymerization, the inside temperature was kept at 60° C. with a stirring rotation speed of 600 rpm. After the dropping polymerization was completed, the inside temperature was kept for 2 hours at 65° C. Subsequently, dehydration was carried out by centrifugation. As a result, 288 g of a vinyl acetate/methyl acrylate copolymer (water content: 10.4%) was obtained. The vinyl acetate/methyl acrylate copolymer had a mass average particle size of 180 μm.

1. customequipped with a stirrer
2. customa thermometer, a N2 gas introduction pipe, a reflux condenser and a dropping funnel, and the interior was purged with N2 gas for deoxidation
3. additionSubsequently, 1 g of a partially saponified polyvinyl alcohol (saponification degree: 88%) and 1 g of lauryl peroxide were charged
4. customwas elevated to 60° C
5. additionwere dropped through a dropping funnel over 4 hours
6. custompolymerization
7. customwas kept at 60° C. with a stirring rotation speed of 600 rpm
8. customAfter the dropping polymerization