of modifier this particular pigment not present within a low viscosity dispersion is conventional and propylene carbonate provided excellent viscosity modifications at each level viscosity measurements cps for 0 1 3 5 10 and 15 additions by weight of modifier viscosity measurements cps for 0 1 2 3 5 10 and 15 by weight additions of modifier at lower concentrations pc is a much more effective viscosity modifier than eg viscosity measurements cps for 0 1 3 5 10 and 15 by weight additions of modifier propylene carbonate is an excellent viscosity modifier for this specific pigment dispersion viscosity measurements cps for 0 1 3 5 10 and 15 by weight additions of modifier for this specific pigment not in a liquid dispersion intially all of these provided excellent viscosity modifying characteristics viscosity measurements cps for 0 1 2 3 5 10 and 15 by weight additions of modifier propylene carbonate and butyrolactone are much more effective viscosity modifiers than ethylene glycol for this specific pigment dispersion viscosity measurements cps for 0 1 3 5 10 and 15 by weight additions of modifier this pigment is initially present as a paste and is made from about 25 40 carbon black 75 u2212 60 polyether polyol and a small amount of other additives the cyclic compounds such as propylene carbonate butyrolactone and caprolactone are.