Vestinol IB Diisobutyl phthalate 84-69-5 Degussa-Oxeno Olefinchemie Plasticizers >> Phthalate >> DBP, Di Butyl Phthalate ADHESIVE Di-iso-buty-phtalate. Major application is flexibilization of adhesives. 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 adhesives. Applicable for gelling at low temperature. Possesses a high volatility and is used in admixture with longer chain esters.