| 摘要 |
<p>A process for producing a powder which is excellent in powder properties such as handleability, flowability, and antiblocking property, has excellent redispersibility during melt-kneading together with other resin(s), and is reduced in fish-eye generation. The process comprises spraying an emulsion polymerization latex containing an acrylic polymer as the main component in a drying chamber, simultaneously introducing a drying gas thereinto through an inlet of the drying chamber to dry the latex and thereby form a powder of the acrylic polymer, and collecting the powder through an outlet of the drying chamber. In this process, the spraying of the latex is conducted with a spray nozzle, the temperature of the gas around the inlet of the drying chamber is regulated to below 200°C, and the temperature of the gas around the outlet of the drying chamber is regulated to a temperature lower than the temperature higher by 30°C than the minimum film-forming temperature of the emulsion polymerization latex. Thus, a powder having excellent performances is obtained.</p> |
