Effects of Process Conditions on Properties of Nanoscale Organic Pigment Encapsulated by Poly(styrene-maleic acid) Dispersion

Abstract

The effects of process conditions on properties of nanoscale organic pigment red 122 encapsulated by poly(styrene-maleic acid) dispersion were evaluated. The results revealed that sodium hydroxide provided the dispersion superior performance as compared with other additives, regardless of it being taken as dispersant or hydrolysis reagent. An optimal process was attained by using sodium hydroxide with a dosage of 0.6-0.68 times of molar amount of ÀCOOH groups in poly(styrene-maleic acid) when the pigment/poly(styrene-maleic acid) was hydrolyzed at 45 C for 30 minutes.