[EN] DUAL METALLOCENE CATALYST FOR PRODUCING FILM RESINS WITH GOOD MACHINE DIRECTION (MD) ELMENDORF TEAR STRENGTH<br/>[FR] CATALYSEUR METALLOCENE DOUBLE POUR LA PRODUCTION DE RESINES DE FILM PRESENTANT UNE BONNE RESISTANCE AU DECHIREMENT DE TEST ELMENDORF DANS LE SENS MACHINE
申请人:CHEVRON PHILLIPS CHEMICAL CO
公开号:WO2005070977A1
公开(公告)日:2005-08-04
This invention relates to catalyst compositions comprising a first metallocene compound, a second metallocene compound, at least one chemically-treated solid oxide, and at least one organoaluminum compound. This invention also relates to methods to prepare and use the catalyst compositions and new polyolefins. The compositions and methods disclosed herein provide ethylene polymers and copolymers with lower MI, increased melt strength, and good MD tear properties.