Commercially Available Perylene Pigments

Representative commercial perylene pigments are listed in Table 29 Table 29 Commercially available perylene pigments. 

In plasticized PVC, P.R.149 is very fast to migration. It also shows excellent tinctorial strength. 1/3 SD samples in plasticized PVC containing 5% TiOz are formulated at only 0.63% pigment. Comparative values are 0.75% P.R.123,1.2% of the y-modification of P.V.19, a quinacridone pigment, and 1.0% of P.R.122. 

149 furnishes high lightfastness. Transparent colorations at 1/25 SD and opaque colorations at 1/3 to 1/25 SD equal step 8 on the Blue Scale for lightfastness. The pigment is not durable enough to be used in long-term exposure. The commercially available products are extremely transparent, a feature which is exploited in a variety of applications. 

149 also lends color to cast resins made from materials such as unsaturated polyester or methacrylic acid methylester, which are polymerized with peroxide catalysts. P.R.149 is equally lightfast in these media. In polycarbonate, the pigment tolerates exposure to more than 320°C. This is an asset in view of the fact that polycarbonate shows high melt viscosity and is thus processed at up to 340°C. The list of applications also includes other media, such as PUR foams and elastomers, for which P.R.149 is recommended because of its good heat stability and its coloristic properties. 

179 types demonstrate excellent weatherfastness. They are as weatherfast or even more weatherfast than substituted quinacridone pigments. The various types differ considerably in their flop behavior. Some of the commercially avail- 

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Table 16.1 summarizes the commercially available perylene pigments [3], with the general formula (1). 

Although not commercially available as pigments, the half imide/half anhydrides of PTCA (10), for example (11), are beginning to find academic and commercial interest, since they can be used to produce both unsymmetrical perylene diimides and perylene mono-imides (through decarboxylation) . ... 

P.R.206 is a mixed crystal type and consists of unsubstituted quinacridone and quinacridone quinone. The ratio between the two components as well as the crystal modification is not yet known. P.R.206 affords a very dull, yellowish shade of red, referred to as maroon. The pigment is considerably weaker than perylene pigments. All commercially available types of P.R.206 are more or less transparent and are used mostly in metallic finishes for automobiles, to which they lend reddish shades of copper. The pigment is often found to be difficult to disperse. The finishes frequently exhibit rheological problems, especially at high pigment concentration. 

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