CHANGE OF INTERNAL DONOR FOR MG(OET)(2)-SUPPORTED TICL4 CATALYST

During the in-situ preparation of Mg(OEt)(2)/di-n-butylphthalate(DNBP)/TiCl4 catalyst, some amount of DNBP converted into its derivatives such as diethylphthalate(DEP) >> ethyl-n-butylphthalate(EBP). With binary DNBP/DEP internal donor, DNBP and DEP contents in catalyst could be controlled, and it was found that catalyst activity depends on relative amounts of DNBP and DEP rather than total diester content. With addition of Ti(OBu)(4), DEP formation was suppressed and molecular weight distribution of polypropylene became wider.