PROCESS FOR PRODUCING
QUINACRIDONE PIGMENT
Patent No. U.S. 6,818,053 B2
Japan Science and Technology
Corp. has received a patent for a
method for preparation of
quinacridone pigment nanocrystals
with sub micrometer to nanometer
in average size. It is comprised of
supplying supercritical or sub-critical
liquid, which can dissolve
quinacridone pigment, into a reactor
containing quinacridone pigment,
flowing out the supercritical or subcritical
liquid in which quinacridone
pigment is dissolved from the reactor
to a mixing apparatus to which
coolant is supplied, and selecting
the kind of supercritical or sub-critical
liquid and by selecting the combination
of supplying speed of each
liquid, temperature of the liquid and
the reacting pressure.