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Pigments for Water Based Inkjet Inks
In water-based inkjet inks there is presence of volatile organic
compounds (VOC) and they do have low level of toxicity, the dry rate is
relatively slow on the non-absorbent substrates. They often require a
special coated media for optimizing dot gain and drying. They also need
lamination to secure water resistance. Originally they were developed for
the desktop systems only but moved on to facilitate the growth of inkjet in
Pigments give environmental friendly products along with durability and
better compatibility with packaging. However one thing needs to be specified
here is that the colloidal properties generally associated with pigments are
more complex than dyes.
Pigments for Water based inkjet printing
Inorganic pigments that are used for making printing inks are Carbon Black
(very important), Titanium Oxide, Molybdenum Red Pigments and iron Blue all
with medium usages while Chromate Pigments (sparingly used).
To make the white inks, the most important inorganic pigment is Titanium
dioxide. Another popular inorganic pigment, calcium carbonate is used as an
extender to make white inks. But, if we want to make black ink, then the
most randomly used inorganic pigment is carbon black.
Now a days, the inorganic colored pigments are very rarely used because,
these pigments contain very high degree of metallic toxics like chromium,
cadmium and lead. In their place to create green and blue shades,
phtalocyanine pigments are used. For red and yellow shades inks, Azo
pigments are very preferred medium.
Whether the molecules of the pigments will absorb light in the visible
range or not, depends upon the presence of the conjugated system of double
bonds in these molecules.
A few type of Pigments that are used for colored printing inks
Yellow (Azo Pigment)
Magenta (lithol pigment) Cyan
Pigments are tiny combinations of a variety of molecules. They are much
bigger in size than their dye counterparts. This size advantage translates
- Less susceptibility to environmental factors and oxidising gases.
Particles that are found in a dried pigment ink has a surface that is very
rough. As a result the light that is reflected of the prints has a
predominant tendency toward scattering, giving rise to color that is less
saturated and dull.
Recipe for a perfect Pigment Inkjet Ink
- 100% of water-fastness on any type of media.
- Excellent color hue and quality for that perfect imaging effect.
- Excellent light and weather fastness.
- Particle size below the level of 0.08 micron.
- No problem of clogging.
- Quick drying.