Phthalocyanine Green G

• Copper phthalocyanine
• Brillantphthalocyaningrün
• C. I. Pigment Green 7
• C. I. 74260
• Heliogene

Green, odorless powder

Fixed

2.00 g · cm -3

480 ° C ( 350 ° C decomposition)

Practically insoluble in water

> 5000 mg · kg -1 ( LD50, rat, oral)

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Phthalocyanine green, is a Polychlorkupferphthalocyanin. It is a synthetic dark green pigment and belongs to the chemical structure of the phthalocyanines. Complex organic compound is derived from phthalic acid. In the Colour Index is under C. I. Pigment Green 7 is guided.

History

Phthalocyanine green (Pigment Green 7 ), was produced in 1938, 3 years after the commercial introduction of phthalocyanine blue for the first time on a commercial scale. The brominated variant, Pigment Green 36, was introduced in 1959.

Production and representation

Polychlorkupferphthalocyanin is obtained by chlorination of copper in a Aluminiumchlorid-/Natriumchlorid-Schmelze, with currently more than 10 000 t of which are produced annually.

Properties

As the phthalocyanine blue is located in the center of the ring -halogenated compound, a Cu atom. This provides an increased color stability, which is increased by the chlorination. In addition, the generally high standard of fastness of polycyclic pigments. In addition, this pigment is extremely solvent, acid and alkali resistant and non-toxic

Use

Use of this pigment found in soaps, such as toilet soap, syndet and liquid soap. Furthermore, it is used as an additive in shampoos, shower baths, dishwashing detergents, laundry detergents and fabric softeners.

As pigment for use in paint and inks, as well as in coatings, plastics (eg contact lenses ) one finds phthalocyanine under different names ( Fast Green, Helio Fast Green, Pigment Green 7, Vert héliogène, MONASTRAL Green ) directly in the trade.

In industrial applications in paints, plastics and high-quality inks phthalocyanine green is the green pigment used as standard due to its excellent fastness levels.

As Schulmalfarbe the pigment is simply known as dark green.

Yellow types

If the 3-position is not chlorinated at all four benzene rings, but brominated, the result of the 2Y - type Phthalocyaningrüns. This yellow-green types are listed in the Colour Index as CI Pigment Green 36 is guided. All brominated pigments are summarized under this CI number. In the shade, these pigments are significantly more yellow. As the number of bromine atoms in the molecule of the yellow tinge is more apparent. If chlorine is replaced by bromine atoms at 2Y four, all Cl are replaced by Br at 8Y - type; the pigment characteristics of different manufacturers differ, however slightly. The pigments are green powder with a density of 2.3 to 2.7 g / cm ³. The demand for oil is 23 to 28 %, which is lower than for CI Pigment Green 7 color purity, color strength and opacity also correspond to the properties of the unbrominated green pigment. However, the manufacturing cost of the yellow-green pigments are higher. The trading price of the yellow types is higher by almost one-third; Therefore, the production amounts are about a quarter of the amount of chlorinated pigment. In their IR spectra, the two pigments differ significantly.