Fine particle having uniform particle diameter and production thereof

Abstract

Abstract PURPOSE:To obtain fine particle having excellent uniformity of particle diameter, stress-relaxation capability and excellent solvent resistance, by using fine particle of a polymer as a seed and copolymerizing a crosslinkable monomer and a non- crosslinkable monomer in the seed particle and on the surface of the particle. CONSTITUTION:A dispersion of fine polymer particles having particle diameter of <=20mum and a standard deviation of particle size distribution of <=0.5mum is added with a monomer mixture composed of 20-50wt% crosslinkable monomer and the remaining part of a non-crosslinkable monomer. The amount of the monomer mixture is 100-3,000pts.wt. per 100pts.wt. of the polymer particles. The monomers are polymerized in the presence of an oil-soluble polymerization initiator by heating the system at the decomposition temperature of the above initiator. The rate of polymerization is maintained within a range to keep the surface of the produced particle from roughening. Spherical fine particles having a particle diameter of 1-30mum and a standard deviation of the particle size distribution of <=1mum and composed of a heterogeneous phase containing modified fine polymer particles and a homogeneous layer of crosslinked polymer on the polymer surface can be produced by this procedure.

Inventors

• 👤 Tadashi Asano
• 👤 浅野　匡司
• 👤 Ken Noda
• 👤 謙 野田
• 👤 Yutaka Moroishi
• 👤 裕 諸石
• 👤 Tsunetaka Matsumoto
• 👤 松本　恒隆

Bibliographic Details