Coloring fine particle and toner for developing electrostatic images using the same

DETAILED DESCRIPTION The objects of the present invention are achieved by coloring fine particles, produced by heating spheroidal coloring fine particles obtained by suspension polymerization with an average particle diameter of 1 to 100 .
mu.
m to a temperature of 30.
degree.
to 200.
degree.
C.
, thereby causing the particles to fuse together in a block without completely destroying the particle interfaces, and then crushing the block to a substantially the same average particle diameter of the spheroidal coloring particle before melting.
The objects of the present invention are achieved also by a method of manufacturing coloring fine particles, produced by heating spheroidal coloring fine particles obtained by suspension polymerization with an average particle diameter of 1 to 100 .
mu.
m to a temperature of 30.
degree.
to 200.
degree.
C.
, thereby causing the particles to fuse together in a block without completely destroying the particle interfaces, and then crushing the block to a substantially the same average particle diameter of the spheroidal coloring particle before melting.
The objects of the present invention are achieved also by a toner for developing electrostatic images using coloring fine particles, produced by heating spheroidal fine coloring particles obtained by suspension polymerization with an average particle diameter of 1 to 100 .
mu.
m to a temperature of 30.
degree.
to 200.
degree.
C.
, thereby causing the particles to fuse together in a block without completely destroying the particle interfaces, and then crushing the block to a substantially the same average particle diameter of the spheroidal coloring particle.
The coloring fine particles of this invention are produced by heating, under certain conditions, the spheroidal fine particles obtained by suspension polymerization, and then crushing the product.
The shape of the coloring agent thus obtained is not specifically limited, but for example it is macroscopically spheroidal and it may be a particle having unevenness on the surface or non-spheroidal particle