Surface Area

As a general rule, 2-2.5mg of polymeric dispersant, per square metre of pigment surface area will be close to the optimum amount required. A ladder series of polymeric dosage levels should be evaluated based around this 2-2.5mg/m2 level. Measurement of dispersion viscosity will show a minimum at the optimum dosage; although it is also possible to measure gloss or colour strength of the coating which will show a maximum at the same optimum dosage. Typically, the surface area of phtalocyanine blue pigment is 50 m2/g: So a typical dosage would be : Phtalocyanine blue pigment 30.0 (i.e: 10% active dispersant on the weight of pigment) Polymeric dispersing agents 3.0

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