Abstract: A high activity olefin polymerization catalyst catalyzes the production of polymeric lower .alpha.-olefin having good properties. The catalyst is produced from an organoaluminum cocatalyst, a selectivity control agent and a novel olefin polymerization procatalyst which is prepared by contacting a tetravalent titanium halide, an optional inert diluent, an electron donor and a novel solid procatalyst precursor obtained by contacting (a) a carbonated magnesium alkoxide of the general formula ##STR1## wherein R is a hydrocarbyl group having up to 12 carbon atoms and x is a number from 0.1 to about 2; and (b) at least one halogenating compound which is a non-transition metal halogenated compound or non-metallic halogenated compound. A process for polymerizing one or more .alpha.-olefins utilizing the novel high activity polymerization catalyst.

Abstract: Polypropylene impact copolymer compositions containing a nucleating agent demonstrate not only good low temperature properties, including impact strength, but also resistance to stress whitening when the numerical ratio of the intrinsic viscosity of the copolymer rubber phase to the intrinsic viscosity of the homopolymer phase is near unity and ethylene contents of the copolymer phase are in the range of 38% to 60% by weight. The impact copolymer compositions are useful in the production of molded and extruded articles, shaped containers, and films having good clarity.

Abstract: Disclosed is a process for pelletizing ultra high melt flow crystalline polymers to produce dust-free, uniform ultra high melt flow crystalline pellet products. The process comprises feeding polymer into melting/mixing means, resulting in molten polymer. The molten polymer is transferred to a droplet forming means that produces droplets of the molten polymer. The droplets collect on a continuously moving cooling conveyer and solidify to form dust-free, uniform ultra high melt flow crystalline polymer pellets. Further, the process produces ultra high melt flow crystalline polymer pellets which are uniformly compounded.

Abstract: A polymer composition having a good balance of improved mechanical properties and optical properties such as low haze, which comprisesa) propylene-butene random copolymer,b) at least one additive, andc) a clarifying agent which is calcium montanate, at least one polyolefin wax or combinations thereof.

Abstract: A solid catalyst component for alkene polymerization comprising a magnesium halide, an electron donor and a phenoxy-titanium halide, the latter being a dihalophenoxy-titanium halide or a dialkoxyphenoxy-titanium halide in which the alkoxy groups each have from 1 to 8 carbon atoms.

Abstract: This invention relates to a continuous process for incorporating additives into or onto polymer granules by high speed/high intensity mixing of entrained polymer granules and additive particles, wherein the additive is provided in the form of an additive dispersion.

Abstract: An improved high activity olefin polymerization catalyst catalyzes the production of polymeric lower .alpha.-olefin having good properties and a relatively narrow particle size distribution. The catalyst is produced from an organoaluminum cocatalyst, a selectivity control agent and a novel olefin polymerization procatalyst which is prepared by contacting a tetravalent titanium halide, a halohydrocarbon, an electron donor and the solid procatalyst precursor obtained by heating an adduct of a carbonated magnesium ethoxide and a phenolic compound of enhanced acidity.

Abstract: A catalyst composition obtained by contacting (a) a Group IVA metal compound of the general formula(Cp).sub.p MeX.sub.4-pwherein Cp is, independently, cyclopentadienyl groups substituted with one or more hydrocarbyl groups, and at least one cyclopentadienyl group is substituted with a single, optionally substituted, aryl group, Me is a Group IVA metal, X is one or more non-cyclopentadienyl substituents attached to the Group IVA metal, wherein the substituents are hydrocarbyl groups, hydrocarboxy groups, hydrocarbamide groups, hydrogen or halogen, and p is an integer of from 1 to 4; and (b) an aluminoxane. Further, a process for polymerizing one or more alpha-olefins by contacting the one or more alpha-olefins with the catalyst composition of the invention to produce polymers.

Abstract: Polypropylene impact copolymer compositions demonstrate not only good low temperature properties, including impact strength, but also resistance to stress whitening when the numerical ratio of the intrinsic viscosity of the copolymer phase to the intrinsic viscosity of the homopolymer phase is near unity and ethylene contents of the copolymer phase are in the range of 38% to 60% by weight. The impact copolymer compositions are useful in the production of molded and extruded articles, shaped containers, and films having good clarity.

Abstract: Polypropylene impact copolymer compositions and visbroken derivatives thereof demonstrate a good balance of low temperature properties and resistance to stress whitening when the homopolymer phase is at least predominantly homopolymeric polypropylene and the rubber phase comprises a major proportion of ethylene with a minor proportion of .alpha.-olefin of at least 4 carbon atoms and a minor proportion of propylene.

Abstract: An improved process for separation of valuable components of a waste stream resulting from production of an olefin polymerization procatalyst by the addition to the waste stream of a separation solvent of intermediate boiling point, subjecting the resulting mixture to a first distillation zone to separate the desired waste stream components from the upper portion of the zone and passing the bottoms product to a second distillation zone wherein separation solvent is recovered from the upper portion of the zone for recycle and passing the bottoms product to disposal or further processing.

Abstract: Novel stabilized compositions comprise organic material normally subject to oxidative degradation stabilized by the presence therein of a stabilizing quantity of a novel, at least partial ester of poly(vinylphenol) and a 3,5-dialkyl-4-hydroxybenzoic acid wherein at least one of the alkyl groups is a bulky alkyl.

Abstract: Ethylene-propylene-diene monomer terpolymers having a high degree of random polymerization are produced by employing a high activity, stereo-regular olefin polymerization catalyst comprising a titanium halide-containing procatalyst, an organoaluminum compound cocatalyst and a moderately hindered aromatic heterocyclic amine as selectivity control agent. The terpolymers are elastomeric and exhibit good processability.

Abstract: A complex alkoxide compound containing magnesium, titanium and boron species comprises the reaction product of elemental magnesium, titanium tetraalkoxide, an alkyl borate ester and alkanol at elevated temperature in an inert diluent. This complex alkoxide compound is contacted with a tetravalent titanium halide, a halohydrocarbon and an electron donor to form an olefin polymerization procatalyst. Contact of the procatalyst with an organoaluminum cocatalyst and a selectivity control agent produces a high activity catalyst for the polymerization of lower .alpha.-olefins to polymer product of good properties in good catalyst productivity.

Abstract: An improved high activity olefin polymerization catalyst catalyzes the production of polymeric lower .alpha.-olefin having good properties and a relatively narrow particle size distribution. The catalyst is produced from an organoaluminum cocatalyst, a selectivity control agent and a novel olefin polymerization procatalyst which is prepared by contacting a tetravalent titanium halide, a halohydrocarbon, an electron donor and the solid procatalyst precursor obtained by heating an adduct of a carbonated magnesium ethoxide and a phenolic compound of enhanced acidity.

Abstract: The present invention includes:(i) a method for making a coated particulate comprising the steps offorming a polyolefin emulsion or dispersion;fluidizing additive particles;spraying the emulsion or dispersion on the fluidized additive particles; andforming discrete substantially coated additive particles;(ii) a coated particulate made by the above process; and(iii) a process for providing in-reactor stabilization of a polyolefin during a polymerization reaction using the coated additives prepared by the above described method.