Investigation of the Effects of Rosination in the Preparation of Lithol Red R (C.I. Pigment Red 49)

It has been found that alkali metal salts of wood rosin are amphiphilic and in certain concentrations in water exhibit mesophase behaviour. The influence of sodium and barium rosinates below and above their CMC values on the morphology and crystal structure of Lithol Red R (C.I. Pigment Red 49) has been studied by Scanning Electron Microscopy (SEM) and X-ray diffraction methods. The results indicate that the morphological changes which occur on rosination are probably due to the incorporation of the pigment in the micellar structure and also a consequence of molecular adsorption of rosin on the pigment particles