Preparation of latex carriers for controlled release by concentrated emulsion polymerization

✍ Scribed by Kyu-Jun Kim; Eli Ruckenstein

• Publisher: John Wiley and Sons
• Year: 1989
• Tongue: English
• Weight: 548 KB
• Volume: 38
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1989.070380304

✦ Synopsis

Spherical latexes of submicron diameter containing a model hydrophobic herbicide, namely, 2-(2,4-dichlorophenoxy)-propionic acid, were prepared by the concentrated emulsion polymerization method. A mixture of styrene, herbicide, and initiator was dispersed into a small amount of water (6% by volume based on the entire emulsion) containing surfactant, at room temperature. The heating at 4OoC of the foam like gel thus obtained led to the formation of latexes containing the herbicide. It was found that the model herbicide dispersed in the polymer latex was released to water over a period of several weeks and that the amount released was strongly dependent upon temperature and latex concentration in water.