Vestinol IB Diisobutyl phthalate 84-69-5 Degussa-Oxeno Olefinchemie Plasticizer >> Phthalate Inks Printing Inks & Varnishes Di-iso-buty-phtalate. Major application is flexibilization of printing inks. The plasticizer is applicable for gelling at low temperature, in production of foam and for high speed processing. Because of its high volatility, this product is preferably used in admixture with longer chain esters. Di-iso-buty-phtalate. Used as a plasticizer for the flexibilization of printing inks. Applicable for gelling at low temperature. Possesses a high volatility. Can be used in admixture with longer chain esters.