Organic pigment copper phthalocyanine

The colloidal stability and pigment surface modification of aqueous dispersions of inorganic pigments Ti02 (rutile) and Fe203 (red) as well as organic pigment copper phthalocyanine CuPc (blue) treated in an ultrasonic field in the presence of water-soluble polymers and surfactants was studied. 

Effect of Ultrasonic Treatment on Stability of Aqueous Dispersions of Organic Pigment - copper Phthalocyanine... 

Figure 3 FTIR spectra of pigments and charges in potassium bromide pellets (A) organic pigment (copper phthalocyanine type py, (B) inorganic pigment (titanium dioxide) and (C) charge (calcite).

Photochromic Organic Dyes. Intensive investigations into this category of substances have led to numerous patent appHcations. Copper—phthalocyanine pigments, organic dyes based on cyanine (Ricoh, Pioneer), naphthochinone (Nippon Denki), and ben2othiopyrane (Sony) (123) have been described. They did not lead, however, to any commercial use. Surveys on the possibiUties of optical data storage with photochromic dyes can be found (124,125). 

Organic semiconductors are becoming increasingly important in the fabrication of electronic devices. For electron transport, metal complex pigments, such as hexa-deca-fluoro copper phthalocyanine (76), are showing potential.79... 

Dyes manufactured from the family of chemical compounds known as the phthalocyanines. Copper phthalocyanine is a pigment where, it should be noted, the copper atom is well protected by organic radicals and does not catalyse the deterioration of the rubber compound into which it has been incorporated. Phytophthora... 

It has often been observed that the coloristic properties of an organic pigment are a function not only of the size of particles but also of their shape. This is due to the anisotropy of the optical properties in different crystallographic directions within the crystal forms of a pigment. In 1974 [5, 6], it was demonstrated that of the equally sized but differently shaped particles of beta copper phthalocyanine blue, the almost completely cubic, i.e., more or less isometric form produces greenish blue shades, while acicular forms are responsible for reddish blue hues. The optical behavior of ordered pigment particles in systems has been reported in the literature [7, 8]. 

Copper phthalocyanine pigments also demonstrate good overall stability to organic solvents. A number of solvents, however, especially aromatics, may cause a change of modification in unstable types or overcrystallization in stable varieties. This phenomenon is largely due to the tendency of the stable phase to nucleate. The particle size of the resulting cystals decreases as the number of nuclei rises. (3-Copper Phthalocyanine Blue is the thermodynamically stable modification. 

The printing ink industry utilizes P.Gr.7 particularly for packaging printing inks. In this area, however, green shades are frequently also produced by combining the less expensive (3-Copper Phthalocyanine Blue with suitable organic yellow pigments. 

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