A flame retardant with which fire retardancy is improved and the fire retardancy is able to be secured stably for a long time is provided. An internal layer 11 containing a polymer and a flame retardant factor layer 12 that is formed outside of the internal layer 11 and that contains a polymer to which at least one of a sulfonate group and a sulfonate base is bonded are included. Thereby, compared to a case that the flame retardant factor layer 12 is not included, moisture is hardly absorbed, and respective particles of the flame retardant are inhibited from being adhered to each other. Accordingly, blocking is inhibited.
本发明提供了一种阻燃剂,该阻燃剂的阻燃性能得到改善,并且能够长期稳定地保持阻燃性能。该阻燃剂包括含有聚合物的内层 11 和形成于内层 11 外部的阻燃因子层 12,该阻燃因子层 12 含有粘结了
磺酸基和
磺酸基中至少一种的聚合物。因此,与不包含阻燃剂因子层 12 的情况相比,几乎不吸收
水分,阻燃剂的各个颗粒也不会相互粘连。因此,阻塞现象得到抑制。