Polycarbonates pigments

Comparatively little information is available concerning the use of additives in commercial grades of polycarbonate. Pigments, heat and ultraviolet stabilisers, blowing agents and fire retardants are used but the range of materials available... 

Table 7.2 Melt How index of polycarbonate, pigmented with % Ti02 showing the eifect of various surface treatments...

Materials. Beside inorganic materials (eg, barium chloride/fluoride crystals, doped with 0.05% samarium), transparent thermoplasts are preferred for the PHB technique, eg, poly (methyl methacrylate) (PMAIA), polycarbonate, and polybutyral doped with small amounts of suitable organic dyes, organic pigments like phthalocyanines, 9-arninoacridine, 1,4-dihydroxyanthraquinone [81-64-1] (quinizarin) (1), and 2,3-dihydroporphyrin (chlorin) (2). 

Moreover, y-P.V.19 is also found in a variety of other media, such as powder coatings and cast resins. This includes systems based on unsaturated polyester resins whose hardening is not affected by the pigment. The list of application media includes plastics which are processed at very high temperature (such as polycarbonates), in which the pigment is thermally stable up to 320°C. PUR foams and... 

P.R.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. 

A very wide range of plastics are coloured with pigments including PVC, polystyrene, polyurethane, polyamide, polycarbonate, polyester, elastomers, thermosets and thermoplastics. The choice of pigment is obviously dependent on which plastic... 

Enokida et al. (1993) measured hole mobilities of dispersions of y-TiOPc in a series of polymers polyaciylate (PA), polycarbonate (PC), polyester (PES), poly(methyl methacrylate) (PMMA), poly(styrene) (PS), polysulfone (PSL), poly(vinyl butyral) (PVB), and poly(N-vinylcarbazole) (PVK). Over a wide range of fields and temperatures, the results followed a logn < pE relationship. The temperature dependencies were described by an Arrhenius relationship with slopes that decreased with increasing field. For all temperatures, the maximum mobilities were observed at approximately 30% TiOPc. The results were also dependent on the specific form of the pigment as well as the polymer. Figure 81 shows the results obtained with different polymers. The TiOPc concentration was 30% and the temperature 295 K. 

---