| 摘要 |
PURPOSE:To produce the titled polymer effectively without a caking phenomenon, by effecting suspension polymerization by adding a vinyl monomer dropwise to water heated to a temprature at which the polymerization can take place. CONSTITUTION:An aqueous medium containing a dispersant (e.g., sodium dodecylbenzenesulfonate) is heated to a temperature at which a vinyl monomer is polymerizable. Then, to this aqueous medium is added a solution comprising a mixture of a vinyl monomer (e.g., styrene) and at least 10wt% hydrophilic group-containing vinyl monomer (e.g., acrylic acid) and 0.1-15wt% polymerization initiator (e.g., benzoyl peroxide) dropwise at an average addition rate of below 16.7g/min.kg water, and the mixture is kept at this temperature for 2-8hr to complete the suspension polymerization. |
