Commercially Available DPP Pigments

Within the range of DPP pigments presently offered to the market, P.R.254 plays the most important role. The pigments differ in their substituents and position at the phenyl ring. The p-position is the preferred one, at present only one pigment with a substituent in the m-position is commercially available. 

Dependent on the substituents the shade from orange to bluish red follows the order  

DPP/quinacridone and DPP/DPP mixed pigments ( solid solutions ) are introduced or presently being offered to the market. 

Some years ago the DPP pigment has been introduced to the market. It produces medium orange shades and is recommended mainly for the use in plastics and printing inks. Special grades for these applications are on the market. 

The plastics type is suitable among others for HDPE, PP and for PVC. 1/3 SD colorations of HDPE (1% TiOz) require 0,35% pigment. These colorations are heat resistant up to 300°C and equal step 8 on the Blue Scale for the lightfastness. The shrinkage of the polymer is only slightly affected at temperatures between 220 and 260°C and somewhat affected at temperatures up to 300°C. P.O.71 has a very good bleeding fastness in plasticized PVC. It is also of interest for the use in PP fibres. 

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