COPPER PHTHALOCYANINE BLUE AND GREEN
EDPR/1152/EIRI
Phthalocyanine Blue (Pigment Blue 15) refers to both the alpha and beta crystal forms of copper phthalocyanine, encompassing several minor variations. These pigments are known for their exceptional durability, including excellent lightfastness whether used in full concentration (masstone) or diluted (tint), strong resistance to acids and alkalis, and stability (no bleeding) when exposed to solvents. The development of these desirable properties in modern production methods overcame initial challenges such as crystallization and flocculation that occurred with early versions of the pigment.
The alpha-crystal form is the one that is unstable to high temperatures and certain solvents. Temperatures a little above 200oF or contact with aromatic solvents for halogen or oxygen containing solvents causes the alpha form to convert to the beeta form of copper phthalocyanine, generally with a loss of strength and always with a change in shade.
Four types of alpha-copper phthalocyanine are (1) the crystallizing type. (2) a crystallization-resistant type. (3) a noncrystallizing type, and (4) a noncrystallizing, nonflocculating type. They become slightly greener in shade in going from the crystallizing to the noncrystallizing, nonflocculating type. Redder shade types of noncrystallizing, nonflocculating pigments are available, but they are a trifle dull compared to the crystallizing type (the reddest of the four types listed above).
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