| 摘要 |
PROBLEM TO BE SOLVED: To provide sustained release particles excellent not only in sustained release property but also in dispersibility and storage stability, and a method for producing the same.SOLUTION: The sustained release particles are obtained by: preparing a hydrophobic solution by dissolving 3-iodo-2-propynyl butyl carbamate (IPBC) in a hydrophobic polymerizable vinyl monomer; preparing an aqueous emulsifier-polyvinyl alcohol solution by blending water, an emulsifier and polyvinyl alcohol; emulsifying the hydrophobic solution in the aqueous emulsifier-polyvinyl alcohol solution; and subjecting the polymerizable vinyl monomer of the emulsified hydrophobic solution to miniemulsion polymerization in the presence of a polymerization initiator; and producing a polymer including the IPBC and having an average particle size of 1 μm or lower. In the polymer obtained by the miniemulsion polymerization, a dipole-dipole force component δof a solubility parameter δ is 5.0-7.0 [(J/cm)], and a hydrogen bonding force component δof the solubility parameter δ is 8.0-10.0 [(J/cm)]. |
