dc.description.abstract |
Titanium dioxide is the most widely used white
pigment. Its predominance is due to the high refractive
index, lack of colour and chemical inertness. High
refractive index in the visual portion of spectrum
results in strong scattering of visible radiation of particles
in the correct size range. This provides the opportunity
for producing film with high opacity. Among
those substances that are available in quantities sufficient
to meet the requirements of industry, no other
material has the high refractive index and other desired
pigmentary properties possessed by titanium dioxide.
The manufacture of titanium dioxide pigments
results in the production of either the anatase or rutile
crystal structure, depending upon the processing.
Rutile pigments have the greater hiding power and also
an improved durability -or less chalking -in paint
medium. Compared with anatase pigment, they have
the disadvantages of costing rather more to produce
and a slight inferiority in color. |
en_US |