The present invention relates to a method of forming polymer on the surface of polymer particles, the method comprising:
(i) providing a dispersion comprising a continuous aqueous phase, a dispersed organic phase comprising one or more ethylenically unsaturated monomers, and a RAFT agent as a stabiliser for said organic phase;
(ii) polymerising the one or more ethylenically unsaturated monomers under the control of the RAFT agent to form an aqueous dispersion of seed polymer particles;
(iii) crosslinking the seed polymer particles;
(iv) swelling the crosslinked seed particles with one or more ethylenically unsaturated monomers to form an aqueous dispersion of monomer swollen crosslinked seed polymer particles;
(v) increasing the temperature of the monomer swollen crosslinked seed polymer particles to expel at least some of the monomer therein onto the surface of the particles; and
polymerising at least the expelled monomer to form polymer on the surface of the particles.
本发明涉及一种在聚合物颗粒表面形成聚合物的方法,该方法包括:(i)提供一个分散体系,该分散体系包括连续的
水相、分散的有机相,该有机相包括一种或多种
乙烯基不饱和单体以及RAFT剂作为有机相的稳定剂;(ii)在RAFT剂的控制下聚合一种或多种
乙烯基不饱和单体,形成种子聚合物颗粒的
水性分散体系;(iii)交联种子聚合物颗粒;(iv)用一种或多种
乙烯基不饱和单体膨胀交联的种子颗粒,形成
乙烯基不饱和单体膨胀交联种子聚合物颗粒的
水性分散体系;(v)提高
乙烯基不饱和单体膨胀交联种子聚合物颗粒的温度,使其中至少一部分
乙烯基不饱和单体排出到颗粒表面;并聚合至少被排出的
乙烯基不饱和单体,在颗粒表面形成聚合物。