Calcium Carbonate Masterbatch

In pigmentary masterbatch, suitable organic or inorganic pigment is dispersed in a carrier resin to produce masterbatch of desired colour. In general, organic pigments have better tinctorial strength, higher brillance, lower opacity, lower toxicity, poor heat and light stability and poor migration resistance as compared to inorganic pigments.
Hence, while selecting a pigment or combination of pigments for making a particular coloured masterbatch, following points are considered.
Hue, value, chroma of the pigment.
Heat and light stability required in the end product viz. organic pigments cannotwithstand higher processing temperature above 240°C.
Resistance to migration and bleeding required.
Dispersion of the pigment in carrier resin.
Some of the pigments cannot be used in direct food contact applications due to their toxicity.
Price of the pigment.Either a single pigment or combination of pigments are used to produce any desired colour.