Patent ID: 6462161
Filing Date: 2002-10-08
Classification: C08F,C08J,C08L,Y10S

Abstract:
A polyolefin copolymer composition produced with a catalyst having a metallocene complex in a single reactor in a process for the polymerization of an &agr;-olefin monomer with one or more olefin comonomers, the composition having a molecular weight maximum which occurs in that 50 percent by weight of the composition which has the highest weight percent comonomer content, as expressed by having a comonomer partitioning factor Cpf which is equal to or greater than 1.10 and/or a molecular weight partitioning factor Mpf which is equal to or greater than 1.15, where the comonomer partitioning factor Cpf is calculated from the equation: Cpf=&Sum;i=1n&it;wi&CenterDot;ci&Sum;i=1n&it;wi&Sum;j=1m&it;wj&CenterDot;cj&Sum;j=1m&it;wj,where ci is the mole fraction comonomer content and wi is the normalized weight fraction as determined by GPC/FTIR for the n FTIR data points above the median molecular weight, cj is the mole fraction comonomer content and wj is the normalized weight fraction as determined by GPC/FTIR for the m FTIR data points below the median molecular weight, wherein only those weight fractions wi or wj which have associated mole fraction comonomer content values are used to calculate Cpf and n and m are greater than or equal to 3; and where the molecular weight partitioning factor Mpf is calculated from the equation: Mpf=&Sum;i=1n&it;wi&CenterDot;Mi&Sum;i=1n&it;wi&Sum;j=1m&it;wj&CenterDot;Mj&Sum;j=1m&it;wj,where Mi is the viscosity average molecular weight and wi is the normalized weight fraction as determined by ATREF-DV for the n data points in the fractions below the median elution temperature, Mj is the viscosity average molecular weight and wj is the normalized weight fraction as determined by ATREF-DV for the m data points in the fractions above the median elution temperature, wherein only those weight fractions, wi or wj which have associated viscosity average molecular weights greater than zero are used to calculate Mpf and n and m are greater than or equal to 3, wherein the composition has at least 0.01 long chain branches per 1000 carbon atoms along the polymer backbone.