UTILIZATION OF COLZA AND SUNFLOWER OILS IN OFFSET PRINTING INKS

The care for environment and the wish to develop non alimentary vegeta ble oils uses led us, in this study, on the one hand to substitute alk yd drying oils, generally used in the printing industry (linseed) by r apeseed or sunflower alkyds, and, on the other hand, to use methylic e sters from these oils as diluents in the formulation of heatset inks. The result is that the oil drying character has no influence on the us e of these alkyds in offset inks formulations, but that methylic ester s viscosity reducing character, as well as varnishes inner cohesion en gendered by that kind of diluent does not allow to realize a simple su bstitution. As a matter of fact, it is essential to review the formula tions from the basis, to allow the use of methylic esters in this kind of application.