Patent ID: 8580902

Claim:
A process for the production of one or more copolymer compositions comprising contacting propylene and one or more comonomers with a catalyst system under polymerization conditions including conducting the polymerization in a homogeneous solution at a temperature of from about 80° C. to about 200° C. and a monomer conversion of from 5 to 90%, where: a. the catalyst system comprises a transition metal compound and an activator, the activator having the formula: [R n AH][Y] − , where the R groups may be identical or different and are a C 1 to C 3 alkyl group; A is nitrogen; n is 3; and [Y] − is a non-coordinating anion represented by [B(R 4 ) 4 ] − , with R 4 being an aryl group or a substituted aryl group, of which the one or more substituents are identical or different and are selected from the group consisting of alkyl, aryl, a halogen atom, halogenated aryl, and haloalkylaryl groups; and wherein the transition metal compound is a dialkylsilylbis(indenyl) metallocene, wherein the metal is a Group 4 metal and the indenyl is unsubstituted or substituted by one or more substituents selected from the group consisting of a halogen atom, C 1 to C 10 alkyl, C 5 to C 15 aryl, C 6 to C 25 arylalkyl, C 6 to C 25 alkylaryl, and wherein the metallocene has two leaving groups, X 1 and X 2 , which are both halogen or C 1 to C 3 alkyl; and b. the copolymer composition comprises units derived from propylene and ethylene, where the copolymer comprises from about 0.1 to about 20 wt % units derived from ethylene, and: i. the density of the copolymer composition is less than about 0.970 g/cc, ii. the heat of fusion of the copolymer composition is less than about 75 J/g, iii. the melting point of the composition satisfies the relation T m >−6.2*e +125, where e is the ethylene content of the composition in wt % and Tm is the melting point in degrees Celsius, iv. the copolymer is prepared using one dialkylsilylbis(indenyl) metallocene, and v. the copolymer composition has a T 75 −T 25 value of less than 35, where T 25 is the temperature in degrees Celsius at which 25% of the eluted polymer is obtained and T 75 is the temperature in degrees Celsius at which 75% of the eluted polymer is obtained via temperature rising elution fractionation (TREF); wherein the Mw of the polymer formed increases or at least does not substantially decrease with increasing monomer conversion at a given reaction temperature.