Abstract: The interaction of silica, previously calcined at 600.degree. C., with dibutylmagnesium (DBM), 1-butanol and titanium tetrachloride and a solution of methylalumoxane (MAO) and (BuCp).sub.2 ZrCl.sub.2 provides a catalyst that, in the absence of a trialkylaluminum (AlR.sub.3) cocatalyst, produces polyethylene with a bimodal MWD.

Abstract: A support containing methylalumoxane and derivatives thereof is described which is formed by an incipient impregnation technique. The most preferred support is silica. Incipient impregnation in accordance with the invention provides a supported alumoxane, methylalumoxane, which substantially eliminates the problem of fluidized bed reactor fouling when methylalumoxane is introduced into the reactor during its operation. In accordance with the invention, the process comprises providing methylalumoxane activated metallocene compound in particulate form as catalysts in fluidized bed gas phase operation.

Abstract: Blends of HDPE, peroxides and antioxidants exhibit reduced die swell which in bottle blow molding decreases bottle weight.

Abstract: Resins which are in situ catalytically produced blends of broad bimodal molecular weight distribution ethylene resin are produced. The resins of the invention are characterized by a blend of low molecular weight component and high molecular weight component with HMW component weight fraction which is greater than 0 (zero). Generally, the LMW/HMW weight fraction can be controlled within a very broad range. The resin has a molecular weight distribution, which is characterized as MFR or Mw/Mn. The bimodal molecular weight resins can be processed into films on existing equipment, and exhibit good processability in blown film production and provide film product of excellent FQR. The resin of the invention exhibits reduced tendency towards die-lip buildup and smoking in on-line operations.

Abstract: Invention process substantially improves the modification efficiency of peroxides through proper selection of anti-oxidant additives and extrusion environment.

Abstract: A bimetallic catalyst produces broad or bimodal molecular weight distribution polyolefin resin whose composition depends on the ratio of the concentration of the two metals of the catalyst producing the HMW and LMW components. The bimetallic catalyst produces a broad/bimodal MWD resin whose HMW and LMW components depend on the relative productivity of each of the transition metal sites of the catalyst. Water and/or carbon dioxide are cofed to the polymerization reactor at levels necessary to modify the weight fractions of the HMW and LMW components, thus achieving a target molecular weight distribution, MWD. The invention allows the resin MWD to be adjusted in the reactor. The weight fraction of the high molecular weight component decreases with the addition of the water and or the carbon dioxide and the FI of the overall product increases with a decrease in the HMW component weight fraction in the product.

Abstract: A support containing methylalumoxane and derivatives thereof is described which is formed by an incipient impregnation technique. The most preferred support is silica. Incipient impregnation in accordance with the invention provides a supported alumoxane, methylalumoxane, which substantially eliminates the problem of fluid bed reactor fouling when methylalumoxane is introduced into the reactor during its operation. The process comprises providing methylaluminoxane in particulate form for use as a catalytic component in the fluidized bed gas phase polymerization process.In accordance with the invention, the process comprises providing methylalumoxane activated metallocene compound in particulate form as catalysts in fluid bed gas phase.

Abstract: A support containing methylalumoxane and derivatives thereof is described which is formed by an incipient impregnation technique. The most preferred support is silica. Incipient impregnation in accordance with the invention provides a supported alumoxane, methylalumoxane, which substantially eliminates the problem of fluid bed reactor fouling when methylalumoxane is introduced into the reactor during its operation.In accordance with the invention, the process comprises providing methylalumoxane activated metallocene compound in particulate form as catalysts in fluid bed gas phase.

Abstract: A film of a linear low density copolymer of ethylene (LLDPE) having an Mz/Mw ratio of greater than 3.5 and exhibiting excellent optical properties and impact strength.

Abstract: The invention relates to novel blend compositions comprising a linear low density copolymer of ethylene and a minor amount of an olefin containing 4 to 10 carbon atoms (LLDPE), and to films of improved properties formed from such compositions. The invention includes a process of forming blown films from such compositions which is accomplished with improved processability and at least substantial retention of the desirable properties of the linear low density polyethylene. The invention also includes a waste bag formed from such blown film products.

Abstract: Novel blends of high density polyethylene compounded with a minor amount of an at least partially isotactic, partially crystalline butene-1 polymer comprising at least about 80 wt % of polymerized butene-1. The blends can be fabricated into containers with lower swell compared to those of the unblended HDPE.

Abstract: A film of a linear low density copolymer of ethylene (LLDPE) having an Mz/Mw ratio of greater than 3.5 and exhibiting excellent optical properties and impact strength.

Abstract: A polymer blend including from about 80 to about 98 weight percent LLDPE and from about 2 to about 20 weight percent PP having an isotacticity of from about 70 to 90 percent, the blend having a viscosity ratio of LLDPE to PP greater than 3, improves the processability of LLPDE into films without loss in film properties.

Abstract: Novel polymer blends are provided comprising a major amount of a linear low density copolymer of ethylene with an olefin containing 4 to 10 carbon atoms (LLDPE) compounded with a minor amount of an ABS resin, based on the total polymer content of the blend. The blends can be fabricated with better processability into blown films having improved antiblocking, impact, and MD tear resistance properties.

Abstract: Novel polymer blends are provided comprising a linear low density copolymer of ethylene with an olefin containing 4 to 10 carbon atoms (LLDPE) compounded with a minor amount of an at least partially isotactic, partially crystalline butene-1 polymer comprising at least about 80 wt. % of polymerized butene-1. The blends can be fabricated with better processability and reduced blocking into blown films having improved impact properties.

Abstract: There is disclosed a supported olefin polymerization catalyst composition comprising a precursor and a catalyst activator. The precursor comprises a magnesium compound, e.g., dibutylmagnesium, a cyclopentadienyl group-containing zirconium compound, and a titanium and/or a vanadium compound, e.g., TiCl.sub.4, and an organic compound, e.g., an alcohol. The catalyst activator is a mixture of a conventional Ziegler/Natta co-catalyst and a zirconium sites activator, e.g., methylaluminumoxane. The catalyst is used in the presence of small amounts of hydrogen to produce polymers having multimodal molecular weight distribution in a single reactor.

Abstract: Novel polymer blends are provided comprising a linear low density copolymer of ethylene with an olefin containing 4 to 10 carbon atoms (LLDPE) compounded with minor amounts of an at least partially isotactic, partially crystalline butene-1 polymer comprising at least about 80 wt. % of polymerized butene-1, and an ABS resin. The blends can be fabricated with better processability into blown films having improved impact and MD tear resistance properties.

Abstract: Novel polymer blends are provided comprising a major amount of a linear low density copolymer of ethylene with an olefin containing 4 to 10 carbon atoms (LLDPE) compounded with a minor amount of an ABS resin, based on the total polymer content of the blend. The blends can be fabricated with better processability into blown films having improved antiblocking, impact, and MD tear resistance properties.

Abstract: Novel polymer blends are provided comprising a linear low density copolymer of ethylene with an olefin containing 4 to 10 carbon atoms (LLDPE) compounded with a minor amount of an at least partially isotactic, partially crystalline butene-1 polymer comprising at least about 80 wt. % of polymerized butene-1. The blends can be fabricated with better processability and reduced blocking into blown films having improved impact properties.

Abstract: Novel polymer blends are provided comprising a linear low density copolymer of ethylene with an olefin containing 4 to 10 carbon atoms (LLDPE) compounded with minor amounts of an at least partially isotactic, partially crystalline butene-1 polymer comprising at least about 80 wt. % of polymerized butene-1, and an ABS resin. The blends can be fabricated with better processability into blown films having improved impact and MD tear resistance properties.