Catalyst systems and methods for making and using the same. A method of polymerizing olefins to produce a polyolefin polymer with a multimodal composition distribution, includes contacting ethylene and a comonomer with a catalyst system. The catalyst system includes a first catalyst compound and a second catalyst compound that are co-supported to form a commonly supported catalyst system. The first catalyst compound includes a compound with the general formula (C.sub.5H.sub.aR.sup.1.sub.b)(C.sub.5H.sub.cR.sup.2.sub.d)HfX.sub.2. The second catalyst compound includes at least one of the following general formulas:

##STR00001##

##STR00002##

In both catalyst systems, the R groups can be independently selected from any number of substituents, including, for example, H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group, among others.

Embodiments of a polyethylene polymer blend having a melt index (I.sub.2)<2 g/10 min are provided, wherein the polyethylene polymer blend comprises at least about 50% by wt. of at least one high density polyethylene resin (HDPE) having a density ≧0.950 g/cm3, a melt index (I.sub.2)<4 g/10 min; a melt flow ratio (I.sub.10/I.sub.2)≦9, and a molecular weight distribution (MWD) of about 2 to about 5; and further comprises about 1% to about 20% by wt. of at least one low density polyethylene resin (LDPE) having a density ≦0.930 g/cm3, a melt index (I.sub.2) of about 0.1 to about 10 g/min, and an MWD>3.

Embodiments of a polyethylene polymer blend having a melt index (I.sub.2)<2 g/10 min are provided, wherein the polyethylene polymer blend comprises at least about 50% by wt. of at least one high density polyethylene resin (HDPE) having a density ≧0.950 g/cm3, a melt index (I.sub.2)<4 g/10 min; a melt flow ratio (I.sub.10/I.sub.2)≦9, and a molecular weight distribution (MWD) of about 2 to about 5; and further comprises about 1% to about 20% by wt. of at least one low density polyethylene resin (LDPE) having a density ≦0.930 g/cm3, a melt index (I.sub.2) of about 0.1 to about 10 g/min, and an MWD>3.

Blown films based on a blend of a C.sub.2C.sub.3 random copolymer and a C.sub.2-based plastomer, which combine low scaling initiation temperature (SIT), good optical properties and an improved stiffness/impact balance, and which also show an excellent sterilization behaviour.

Blown films based on a blend of a C.sub.2C.sub.3 random copolymer and a C.sub.2-based plastomer, which combine low scaling initiation temperature (SIT), good optical properties and an improved stiffness/impact balance, and which also show an excellent sterilization behaviour.

This disclosure relates to ethylene interpolymer products comprising a Melt Flow-Intrinsic Viscosity Index value, MFIVI, of from ≥ 0.05 to ≤ 0.80; a first derivative of a melt flow distribution function, formula (I) at a loading of 4000 g, of from ≥ -1.85 to ≤-1.51; a sum of unsaturation, SUM.sup.U, from ≥ 0.047 to ≤ 0.100 unsaturations per 100 carbon atoms; and a residual catalytic metal of from ≥ 0.03 to ≤ 5 ppm of hafnium. Ethylene interpolymer products comprise at least two ethylene interpolymers. Ethylene interpolymer products are characterized by a melt index (I.sub.2) from 0.3 to 500 dg/minute, a density from 0.855 to 0.975 g/cc and from 0 to 25 mole percent of one or more a-olefins. Ethylene interpolymer products have polydispersity, M.sub.w/M.sub.n, from 1.7 to 25; and CDBI.sub.50 values from 1% to 98%. These ethylene interpolymer products have utility in flexible as well as rigid applications.

[00001]$\frac{dLog(1/I_n)}{dLog(loading)}$

This disclosure relates to ethylene interpolymer products comprising a Melt Flow-Intrinsic Viscosity Index value, MFIVI, of from ≥ 0.05 to ≤ 0.80; a first derivative of a melt flow distribution function, formula (I) at a loading of 4000 g, of from ≥ -1.85 to ≤-1.51; a sum of unsaturation, SUM.sup.U, from ≥ 0.047 to ≤ 0.100 unsaturations per 100 carbon atoms; and a residual catalytic metal of from ≥ 0.03 to ≤ 5 ppm of hafnium. Ethylene interpolymer products comprise at least two ethylene interpolymers. Ethylene interpolymer products are characterized by a melt index (I.sub.2) from 0.3 to 500 dg/minute, a density from 0.855 to 0.975 g/cc and from 0 to 25 mole percent of one or more a-olefins. Ethylene interpolymer products have polydispersity, M.sub.w/M.sub.n, from 1.7 to 25; and CDBI.sub.50 values from 1% to 98%. These ethylene interpolymer products have utility in flexible as well as rigid applications.

[00001]$\frac{dLog(1/I_n)}{dLog(loading)}$

The present disclosure generally relates to catalyst systems, polyethylene compositions, and uses of such compositions in, e.g., films. In an embodiment is provided a film that includes a polyethylene composition, comprising: ethylene and a C.sub.3-C.sub.40 olefin comonomer, the polyethylene composition having at least 75 wt % ethylene content and from 0 wt % to 25 wt % of a C.sub.3-C.sub.40 olefin comonomer content based upon the total weight of the composition as determined by GPC-IR5-LS-VIS, the film having: an average of MD and TD 1% secant modulus of 42,000 psi or greater as determined by ASTM D-882, and a Dart Drop Impact of greater than 400 g/mil, as determined by ASTM D1709. In another embodiment is provided a process for producing a polyethylene composition, comprising: introducing, under first polymerization conditions, ethylene and a C.sub.3-C.sub.40 alpha-olefin to a catalyst system in a reactor, the catalyst system comprising a first catalyst compound, a second catalyst compound, and an activator; and forming a polyethylene composition.

The present disclosure generally relates to catalyst systems, polyethylene compositions, and uses of such compositions in, e.g., films. In an embodiment is provided a film that includes a polyethylene composition, comprising: ethylene and a C.sub.3-C.sub.40 olefin comonomer, the polyethylene composition having at least 75 wt % ethylene content and from 0 wt % to 25 wt % of a C.sub.3-C.sub.40 olefin comonomer content based upon the total weight of the composition as determined by GPC-IR5-LS-VIS, the film having: an average of MD and TD 1% secant modulus of 42,000 psi or greater as determined by ASTM D-882, and a Dart Drop Impact of greater than 400 g/mil, as determined by ASTM D1709. In another embodiment is provided a process for producing a polyethylene composition, comprising: introducing, under first polymerization conditions, ethylene and a C.sub.3-C.sub.40 alpha-olefin to a catalyst system in a reactor, the catalyst system comprising a first catalyst compound, a second catalyst compound, and an activator; and forming a polyethylene composition.

The present invention relates to an olefin polymerization process, wherein propylene and 1-butene and optionally ethylene are reacted in the presence of a Ziegler-Natta catalyst system so as to obtain a polypropylene, wherein the polypropylene comprises 1-butene-derived comonomer units in an amount of from 0.5 to 15 wt % and optionally ethylene-derived comonomer units in an amount of up to 3 wt %, and the Ziegler-Natta catalyst system comprises an external donor of the formula (I)

(R.sup.3).sub.z(R.sup.2O).sub.YSi(R.sup.1).sub.X  (I).