Phthalocyanine green

The major green pigment is phthalocyanine green. It is a complex copper compound that is suitable for use in both solvent- and water-based paints. 

---

Copper Phthalocyanine Green. CPC green is obtained by electrophilic substitution of CPC blue with chlorine, the degree of chlorination reaching 14—15 chlorines per molecule. The typical polychloro-CPCs are blue-shade green pigments. To provide yellower shades of green, substitution of... 

Figure 10 Absorption spectra of a phthalocyanine green pigment and phthalocyanine infrared absorbers.

Phthalocyanine blues, 14 318 Phthalocyanine Green, pigment for plastics, 7 367t Phthalocyanine green, 14 318 Phthaloyl chlorides, 19 715 pH values... 

Largely displaced by copper phthalocyanine green pigments, this product has lost most of its commercial importance. 

At present, Phthalocyanine Blue and Phthalocyanine Green are among the most important organic pigments in the market and are sold in large volume. 

In Germany, Phthalocyanine Green was first prepared commercially in 1938, followed by US companies in 1940. 

Most phthalocyanine green pigments are derived from copper polychloro-phthalocyanines. Chlorobromo derivatives provide a yellowish green shade. 

Likewise, halogenated copper phthalocyanine green pigments also have a major impact on the market (Sec. 3.1.2.5). 

The early days of Copper Phthalocyanine Green synthesis were dominated by two competitive routes. One method was the synthesis of tetraphenyl copper phthalocyanine (Bayer), while the second method involved chlorination of copper phthalocyanine in carbon tetrachloride to form copper tetradeca to hexadeca-chloro phthalocyanine (BASF). It was on the grounds of economical considerations that manufacturers began to prefer the chlorination technique in industrial scale production. 

Copper Perbromo Phthalocyanine Green may also be obtained from tetra-bromo phthalic anhydride by the phthalic anhydride/urea process in the presence of titanium or zirconium catalysts. This route has not yet been introduced on a commercial scale. 

The similarly blue and equally polymorphous metal-free phthalocyanine existing in five different crystal modifications (a, (3, y, k, t) is chemically somewhat less stable than its copper complex [26] it decomposes slowly in a sulfuric acid solution. On the other hand, it can be chlorinated to afford metal-free Phthalocyanine Green. 

Only one cystalline modification has been reported of polyhalogenated copper phthalocyanine green pigments. This phase is closely related to a-Copper Phthalo-... 

Phthalocyanine pigments, which show high tinctorial strength, provide an excellent ratio of strength versus price. The strongest member is a-Copper Phthalocyanine Blue, while yellowish Copper Phthalocyanine Green is the weakest representative. 

The prints exhibit excellent application properties. They are, for instance, entirely fast to organic solvents, soap, alkali, and acids. They are also fast to sterilization. Metal deco prints demonstrate very good heat stability. The products withstand exposure to 200°C for 10 minutes or to 180°C for 30 minutes. Although not quite as fast to heat as halogenated types of Copper Phthalocyanine Green, P.B.15 3 is thus somewhat more heat stable than stabilized a-Copper Phthalocyanine Blue. 

FCjOj/SiOj pigment in conjunction with a mixture of Phthalocyanine Blue (Cl Pigment Blue 15.1) and Phthalocyanine Green (Cl Pigment Green 36) and Carbon Black. 

---