This invention is based on surprising results that dry-coat particles using a melt process where the dispersed melted polymer core (for example a linear polyester diol containing dispersed HAIP) can bead up effectively in a surrounding hydrophobic powder. One good coating powder is identified as organoclay. Silica coating also works well when combined with clay coating. With the coating provided, this invention enables generation of a stable powder with, for example approximately 20%, HAIP loading using a simple grinding and sieving process. The formulations provided can release less than 25% 1-MCP over a period of 4 hours under stirring conditions.
