| 摘要 |
<p>PURPOSE:To make a filler usable without applying classification treatment, by using a fine particle composed of a crosslinked polymer obtained by modifying a fine particle of a low crosslinked polymer obtained by a seed polymerization method with a crosslinkable monomer and a non-crosslinkable monomer. CONSTITUTION:This filler is composed of a fine particle of a crosslinked polymer obtained by absorbing a crosslinkable monomer and a non-crosslinkable monomer by a fine particle of a low crosslinked polymer and copolymerizing both monomers. Since it is generally required that the non-crosslinkable monomer and the crosslinkable monomer are excellent in heat resistance, a styrenic monomer imparting a polymer having a high glass transition point is pref. used as the non-crosslinkable monomer and divinylbenzene low in water solubility is pref. used as the crosslinkable monomer. The crosslinking degree of the fine particle composed of the low crosslinked polymer is pref set so that a swelling degree due to monomers to be used is 4-150, pref., 8-100 and the particle size thereof is pref. 0.5-15mum and the standard deviation of the particle size distribution thereof is more pref. 0.05mum or less. By this method, the filler can be used without applying classification treatment.</p> |
