Patent ID: 8143353

Claim:
A process for producing a propylene polymer, the process comprising: 1) contacting a monomer composition comprising propylene with a polymerization catalyst system under homogeneous polymerization conditions and at a temperature of about 100° C. to about 195° C., wherein the polymerization catalyst system includes an activator and two catalyst compounds, where the first catalyst compound is capable of producing a polymer having a heat of fusion of 10 J/g or less at said homogeneous polymerization conditions and at a temperature of 100° C.-195° C., and the second catalyst compound is represented by the formula (A): wherein M is a transition metal selected from group 4 of the Periodic Table of the Elements; each R 1 is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, substituted silylcarbyl, germylcarbyl, or substituted germylcarbyl substituents, and optionally, adjacent R 1 groups may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent; each R 2 , R 3 , R 5 , R 6 and R 7 is independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, substituted silylcarbyl, germylcarbyl, or substituted germylcarbyl substituents; Y is a bridging group comprising carbon, silicon or germanium; and each X is, independently, hydride radicals, hydrocarbyl radicals, substituted hydrocarbyl radicals, halocarbyl radicals, substituted halocarbyl radicals, silylcarbyl radicals, substituted silylcarbyl radicals, germylcarbyl radicals, or substituted germylcarbyl radicals; or both X are joined and bound to the metal atom to form a metallacycle ring containing from about 3 to about 20 carbon atoms; or both together can be an olefin, diolefin or aryne ligand; or both X may, independently, be a halogen, alkoxide, aryloxide, amide, phosphide or other univalent anionic ligand or both X can also be joined to form a anionic chelating ligand; 2) obtaining a propylene polymer comprising a component having a crystallinity of 5% or less and a component having a crystallinity of 20% or more, said polymer having: a) a melting point of X ° C. or more where X =−0.0038(Tp) 2 +0.36(Tp)+156, where Tp is the temperature of polymerization in ° C.; b) an Mw of 10,000 g/mol or more; c) a heat of fusion of from 1-70 J/g; d) Stereodefects per 10,000 monomer units of Y or less where Y =2.35(Tp)−100 where Tp is the temperature of polymerization in ° C. for the portion of the blend that is insoluble in hexane at 23° C.; e) a dot T-Peel on Kraft paper of 1 N or more; and f) a branching factor of 0.98 or less, where branching factor is the ratio of g′ measured at Mz to g′ measured at Mw.