Plastics quinophthalone pigments

Quinophthalone pigments are marketed in very limited number. The pigments provide yellow to red shades and are used primarily to color paints and plastics. 

P.Y.138 type quinophthalone pigments afford exceedingly lightfast and weather-fast greenish yellow shades with good heat stability. Their main fields of application are in paints and in plastics. 

Quinophthalones. The quinophthalone pigments are prepared by condensation of quinaldincs with a variety of aromatic anhydrides. One pigment in this series, Pigment Yellow 138, is a reasonably weatherfast greenish yellow pigment of good heat stability. The main field of application is paints and plastics. 

The properties described above qualify quinophthalone pigments for applications including high quality industrial finishes, coloring of plastics and metal deco inks. Commercial products are supplied as powders, pigment preparations and liquid dispersions. 

Simple quinophthalone molecules are not suitable as pigments under standard application conditions in plastics and paints. In order to improve their resistance to solvents and migration several routes were followed ... 

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