Polymer filler particles with filler free coating

摘要

A polymer particle produced by forming a layer of filler-free polymer (II) on the surface layer of a filler-containing polymer particle (I) by polymerization of a monomer composed mainly of an ethylenically unsaturated compound in the presence of the polymer particle (I) is suitable for uniformly carrying a biological substance such as an immunoreactive substance, enzyme or cell on its surface because it has no filler in its surface layer, and the physical properties of the filler contained in the polymer particle (I) can be utilized.