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Organic Pigments


Phthalocyanine Green 7

Its structure is as follows

Chemical Structure of Green-7

 

Phthalocyanine Green(now on referred to as Green 7) is a synthetic green pigment from the group of Phthalocyanine dyes, a complex of copper(II) with chlorinated Phthalocyanine. It is a very soft green powder insoluble in water. Its CAS number is [1328-45-6] and [1328-53-6]. Its chemical formula ranges from C32H3Cl13CuN8 to C32HCl15CuN8.

It is a bright, high intensity colour used in oil and acrylic based artist's paints, and in other applications.

Phthalocyanine green is a Phthalocyanine blue pigment where most of the hydrogen atoms are replaced with chlorine. The strongly electronegative chlorine atoms influence the distribution of the electrons in the Phthalocyanine structure, shifting its absorption spectrum. It is made by chlorination of the Phthalocyanine blue as a melt of sodium chloride and aluminum chloride, to which chlorine is introduced at elevated temperature. The phthalo green molecules are highly stable. They are resistant to alkali, acids, solvents, heat, and ultraviolet radiation.

Due to its stability, phthalo green is used in inks, coatings, and many plastics. In application it is transparent. The pigment is insoluble and has no tendency to migrate in the material. It is a standard pigment used in printing ink and packaging industry. It is also allowed in all cosmetics except those used around the eyes, and is used in some tattoos.

 

Phthalocyanine Blue

Its structure is as shown below

Chemical Structure of Phthalo Blue

 

Copper Phthalocyanine Blue (now on referred to as CPC Blue) is a bright, greenish-blue crystalline synthetic blue pigment from the group of Phthalocyanine dyes. Phthalocyanine blue is a complex of copper with Phthalocyanine. Its CAS number is 147 -14-8. Its chemical formula is C32H16N8Cu.

Its Qualities are:
  • Light fastness
  • Tinting strength
  • Covering power and resistance to the effects of alkalies and acids.
  • Insoluble in water and most solvents.

Due to its stability, phthalo blue is also used in inks, coatings, and many plastics. The pigment is insoluble and has no tendency to migrate in the material. It is a standard pigment used in printing ink and the packaging industry.CPC Blue is also used as a source material for manufacture of Pigment Green 7.

     

* Above Source from Wikipedia.