Commercially Available Perinone Pigments and Their Application

4 Commercially Available Perinone Pigments and Their Application 

At present, only the two isomers which constitute the original cis/trans mixture (Vat Red 14) and, to a limited extent, also the mixture itself are commercially used as pigments. 

Transparent and reduced 1/3 SD polyolefin systems are stable up to 300 to 320°C. 0.25% pigment is required in order to formulate 1/3 SD HDPE samples containing 1% TiOz. P.O.43, incorporated in injection-molded partially crystalline plastics such as HDPE, affects the shrinkage of the medium, which precludes its use in nonrotation symmetrical injection-molded articles (Sec. 1.6.4.3). 

The lightfastness of transparent systems matches step 7 to 8 on the Blue Scale, depending on the type of plastic and on the pigment content. In white reductions, at 1/3 to 1/100 SD, the pigment scores between step 8 and step 6. 

43 is useful for transparent colorations of polystyrene. At low concentrations (below 0.1%), the pigment dissolves in thermoplastic polyester to produce 

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