FINE HOLLOW POLYMER PARTICLE, PRODUCTION AND USE THEREOF

摘要

PURPOSE:To obtain the subject highly absorbing and oil-absorbing fine particles by dispersing a monomer mixture containing a hydrophilic monomer containing polyethylene glycol mono(meth)acrylate and crosslinkable monomer in an aqueous medium in the presence of an oil-soluble substance and polymerizing the monomer mixture. CONSTITUTION:In an aqueous medium, is dispersed 100 pts.wt. monomer mixture containing 30-90 pts.wt. hydrophilic monomer containing polyethylene glycol mono(meth)acrylate and 10-70 pts.wt. crosslinking monomer [preferably polyethylene glycol di(meth)acrylate] in the presence of 10-300 pts.wt. oil-soluble substance (e.g. isopropyl alcohol). Polymerization of the monomer mixture is then carried out to afford the objective fine particles, consisting of shell walls of an organic polymer compound having 1.5-10 swelling degree for a liquid substance and capable of providing a spherical shape in enclosing the above- mentioned liquid substance and flat shape in releasing the aforementioned liquid substance.