Abstract: A process for the polymerization or copolymerization of an olefinically unsaturated monomer which comprises contacting the monomer with a chromium metal catalyst composition which is the product obtained by adsorbing a chromium metal complex which contains allyl hydrocarbon radicals with an inert inorganic oxide support which has --OH groups on its surface and which is free from adsorbed water, said monomer being an olefinically unsaturated monomer other than a polar vinyl monomer.

Abstract: Film grade ethylene copolymers are prepared by copolymerizing ethylene with at least one C.sub.3 to C.sub.8 alpha olefin employing a catalyst formed from an organo aluminum activator compound and a precursor composition impregnated in very fine particle sized porous silica, said precursor composition having the formulaMG.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED.sub.q ]wherein R is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical; X is selected from the group consisting of Cl, Br, I or mixtures thereof; ED is an electron donor compound; m is .gtoreq.0.5 to .ltoreq.56; n is 0, 1 or 2; p is .gtoreq.2 to .ltoreq.116; and q is .gtoreq.2 to .ltoreq.85; and said organo aluminum activator compound having the formulaAl(R").sub.c X'.sub.d H.sub.ewherein X' is Cl or OR'"; R" and R'" are the same or different and are C.sub.1 to C.sub.14 saturated hydrocarbon radicals; d is 0 to 1.5; e is 1 or 0; and c+d+e=3.

Abstract: An ethylene polymerization catalyst comprising a supported precursor of vanadium trihalide/electron donor complex and alkylaluminum or boron halides, when combined with alkylaluminum cocatalyst and alkyl halide promoter provides enhanced polymerization and productivity plus superior polyethylene.

Abstract: Granular stereoregular butene-1 polymers having a high isotactic content, and an extractables content of no more than about 15 weight percent in boiling ethyl ether, are produced over a continuous extended period of time in a low pressure gas phase fluidized bed process, in the absence of liquid diluent components, with a stereospecific olefin polymerization catalyst under a selected set of operating conditions.

Abstract: Ethylene copolymers having a density of about 0.91 to 0.94 and a melt flow ratio of about .gtoreq.26 to .ltoreq.40 are readily produced in a low pressure gas phase process at a productivity of .gtoreq.500,000 pounds of polymer per pound of Ti with a catalyst formed from selected organo aluminum compounds and a composition prepared by copulverizing magnesium dihalide with a complex obtained by contacting a titanium compound of the structure Ti(OR).sub.a X.sub.b with an ether, ester, ketone or amine,wherein R is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, or COR' where R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical,X is Cl, Br, I or mixtures thereof, a is 0 or 1, b is 2 to 4 inclusive and a+b=3 or 4.

Abstract: A method of converting a continuous olefin polymerization reaction catalyzed by a Ziegler-type catalyst into one catalyzed by a chromium-based catalyst, without the need of emptying and recharging the polymerization reactor, by adding a hydroxyl-containing compound to the reactor containing the Ziegler-type catalyst to interact with such catalyst before the chromium-based catalyst is introduced into the reactor.

Abstract: Catalyst compositions suitable for producing ethylene polymers in a low pressure gas phase process are produced by forming a partially activated precursor composition from a magnesium compound, titanium compound, inert carrier material and an organoaluminum activator compound in an electron donor solvent.

Abstract: An improved catalyst suitable for preparing film grade ethylene copolymers formed from an organo aluminum activator compound and a precursor composition impregnated in very fine particle sized porous silica, said precursor composition having the formulaMg.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED].sub.qwherein R is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical; X is selected from the group consisting of Cl, Br, I or mixtures thereof; ED is an electron donor compound; m is .gtoreq.0.5 to .ltoreq.56; n is 0, 1 or 2; p is .gtoreq.2 to .ltoreq.116; and q is .gtoreq.2 to .ltoreq.85; and said organo aluminum activator compound having the formulaAl(R").sub.c X'.sub.d H.sub.ewherein X' is Cl or OR"'; R" and R"' are the same or different and are C.sub.1 to C.sub.14 saturated hydrocarbon radicals; d is 0 to 1.5; e is 1 or 0 and c+d+e=3.

Abstract: A catalyst formed from selected organo aluminum compounds and a precursor composition of the formulaMg.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED].sub.qwhereinED is a selected electron donor compoundm is .gtoreq.0.5 to .ltoreq.56n is 0 or 1p is .gtoreq.6 to .ltoreq.116q is .gtoreq.2 to .ltoreq.85R is a C.sub.1 to C.sub.14, aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, andX is selected from the group consisting of Cl, Br, I,or mixtures thereof, which catalyst is in particulate from and diluted with an inert carrier material; a process for preparing such catalyst; a process for using said catalyst to readily prepare ethylene homopolymer having a density of about .gtoreq.0.958 to .ltoreq.0.972 and a melt flow ratio of .gtoreq.22 to .ltoreq.32 in a low pressure gas phase process at a productivity of .gtoreq.50,000 pounds of polymer per pound of Ti. Novel polymers and molded articles are prepared.

Abstract: An article molded from ethylene hydrocarbon copolymers, which articles have superior stress crack resistance and low temperature toughness.

Abstract: A catalytic process for preparing ethylene polymers having a density of .gtoreq.0.95 to .ltoreq.0.97 and a melt flow ratio of about .gtoreq.22 to .ltoreq.32 in a low pressure gas phase process at a productivity of .gtoreq.50,000 pounds of polymer per pound of Ti with a catalyst formed from selected organoaluminum compounds and a precursor composition of the formulaMg.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED].sub.qwherein ED is a selected electron donor compoundm is .gtoreq.0.5 to .ltoreq.56n is 0, 1 or 2p is .gtoreq.2 to .ltoreq.116q=1.5 m+2R is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, andX is selected from the group consisting of Cl, Br, I or mixtures thereof,which catalyst is in particulate form and impregnated in a porous inert carrier material.

Abstract: Catalyst compositions suitable for producing high density ethylene polymers in a low pressure gas phase process with low accompanying ethylene hydrogenation are produced by forming a precursor composition from a magnesium compound, titanium compound and electron donor compound; diluting said precursor composition with an inert carrier material; treating said diluted precursor composition with a boron halide compound; and activating the precursor composition with an organo aluminum compound.

Abstract: A catalyst formed from selected organc aluminum compounds and a precursor composition of the formulaMg.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED].sub.qwherein ED is a selected electron donor compoundm is .gtoreq.0.5 to .ltoreq.56n is 0, 1 or 2p is .gtoreq.2 to .ltoreq.116q is .gtoreq.2 to .ltoreq.85R is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a Chd 1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, andX is selected from the group consisting of Cl, Br, I or mixtures thereof,which catalyst is in particulate form and impregnated in a porous inert carrier material.A process for preparing such catalyst.A process for using said catalyst to readily prepared ethylene copolymers having a density of about .gtoreq.0.91 to .ltoreq.0.94 and a melt flow ratio of .gtoreq.22 to .ltoreq.32 in a low pressure gas phase process at a productivity of .gtoreq.50,000 pounds of polymer per pound of Ti.Novel polymers and molded articles are prepared.

Abstract: A catalyst composition formed from selected organoaluminum compounds and a precursor composition of the formulaMg.sub.m Ti.sub.l (OR).sub.n X.sub.p [ED].sub.q [Filler].sub.rwherein ED is a selected electron donor compoundR is a C.sub.1 to C.sub.14, aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, X is Cl, Br, I, or mixtures thereof, Filler is an inert organic or inorganic compound, and, based on the total weight of such compositionm is .gtoreq.0.5 to .ltoreq.56n is 0 or 1p is .gtoreq.6 to .ltoreq.116q is .gtoreq.2 to .ltoreq.85r has a value such that the percent filler is from about 10 to about 95 weight percent based on the total weight of the precursor composition.A process for preparing such precursor composition by spray drying it from a slurry or solution in said electron donor compound, using atomization.A process for using said catalyst to readily prepare ethylene polymers having a density of about .gtoreq.0.91 to .ltoreq.

Abstract: A method for initiating polymerization of ethylene in a fluidized bed reactor employing a supported chromium oxide as catalyst in a smooth and controlled manner, and for reducing the start-up time required to initiate such polymerization, by adding a dialkylzinc compound to the reactor prior to the commencement of polymerization and subjecting the reactor containing such dialkylzinc compound to conditions conventionally employed in the polymerization of ethylene with such catalyst.

Abstract: Ethylene copolymers having improved resistance to pinstriping and gel streaking when extruded into film can be produced by continuously copolymerizing ethylene with one or more higher alpha olefin monomers in a low pressure gas phase reaction with a catalyst composition prepared by forming a precursor composition from a magnesium compound, titanium compound, and electron donor compound; diluting said precursor composition with a silica support which has been treated with a dialkylzinc compound; and activating the diluted precursor composition with an organoaluminum compound.

Abstract: Heterogeneous ethylene based hydrocarbon copolymers having high tear strength properties in film form, formed from ethylene, C.sub.3-4 monomer and C.sub.5-8 monomer with a molar ratio in the polymer of (C.sub.3-4 /C.sub.2) of about 0.006 to 0.09, a (C.sub.5-8 /C.sub.2) ratio of about 0.003 to 0.07 and having a Chain Branch Factor of about 0.2 to 0.8 and a narrow molecular weight distribution; a gas phase process for making such polymers, and film made from such polymers.

Abstract: Heterogeneous ethylene based hydrocarbon copolymers having high tear strength properties in film form, formed from ethylene, C.sub.3-4 monomer and C.sub.5-8 monomer with a molar ratio in the polymer of C.sub.3-4 /C.sub.2 of about 0.006 to 0.09, a C.sub.5-8 /C.sub.2 ratio of about 0.003 to 0.07 and having a Chain Branch Factor of about 0.2 to 0.8 and a narrow molecular weight distribution; a gas phase process for making such polymers, and film made from such polymers.

Abstract: The copolymerization of ethylene with other alpha olefins in a low pressure gas phase reaction is improved with the use of a catalyst composition prepared by forming a precursor composition from a magnesium compound, titanium compound and electron donor compound; diluting said precursor composition with an inert carrier material; treating said diluted precursor composition with a hydrocarbyl aluminum dihalide compound; and activating the precursor composition treated in this manner with an organo aluminum compound.

Abstract: Ethylene copolymers having improved optical properties in film form are prepared by continuously copolymerizing ethylene with one or more higher alpha olefin monomers in a low pressure gas phase reaction with a catalyst composition prepared by forming a precursor composition from a magnesium compound, titanium compound, and electron donor compound; diluting said precursor composition with an inert carrier material; optionally partially activating the diluted precursor composition with an organo aluminum compound prior to introducing said diluted precursor composition into the polymerization reactor; and completely activating the diluted (and optionally partially activated) precursor composition in the polymerization reactor with a mixture of a dihydrocarbyl aluminum halide compound and a trihydrocarbyl aluminum compound.