Patent ID: 6515037
Filing Date: 2003-02-04
Classification: C08F,Y10S

Abstract:
A polypropylene base resin composition for foam-molding comprising a propyleneâ€¢&agr;, &ohgr;-diene base copolymer containing 0.00001 to 2% by weight of &agr;, &ohgr;-diene and a foaming nuclear agent contained therein, wherein the propyleneâ€¢&agr;, &ohgr;-diene base copolymer is obtained by copolymerizing propylene with &agr;, &ohgr;-diene in the presence of a catalyst system for (co)polymerizing olefin comprising a metallocene supported catalyst obtained by carrying out in order the following step (a) to step (c) or a pre-activated metallocene supported catalyst obtained by carrying out in order the following step (a) to step (d) and an organic aluminum compound:(a): a step for reacting an organic transition metal compound having at least one &pgr; electron conjugated ligand with aluminoxane in an inert solvent to produce a reaction product-a which is a metallocene catalyst, (b): a step for supporting the reaction product-a which is a metallocene catalyst obtained in the step (a) into contact with an inorganic particulate carrier at a temperature of 85 to 150Â° C. in the presence of an inert solvent to support the above metallocene catalyst on the inorganic particulate carrier to produce a solid product-b which is a crude metallocene supported catalyst, (c): a step for producing a refined metallocene supported catalyst obtained by carrying out in order a step for washing at least twice the reaction product-b which is a crude metallocene supported catalyst obtained in the step (b) with aliphatic hydrocarbon at a temperature of âˆ’50 to 50Â° C., and (d): a step for supporting the metallocene supported catalyst obtained in the step (c) into contact with at least one olefin to (co)polymerize the above olefin and supporting an olefin pre-(co)polymer on the metallocene supported catalyst to produce a pre-activated metallocene supported catalyst.