Abstract: A thermoplastic olefin composition useful for making molded articles with high surface gloss and mar resistance includes (1) about 10 to about 90 parts of a propylene homopolymer, copolymer, or terpolymer, (2) about 90 to about 10 parts of either an olefin polymer composition that contains a low molecular weight ethylene copolymer rubber; an elastomeric copolymer of ethylene and a C.sub.3 -C.sub.8 .alpha.-olefin made with a metallocene catalyst, or a mixture of the two, and (3) about 0.1 to about 10 parts of a lubricant per hundred parts of (1) plus (2).

Abstract: An improved gas-phase polymerization process for producing in-situ thermoplastic polyolefins in multiple reactors using high activity Ti/Al catalysts is provided. The improvement consists of developing a control parameter derived from eight integrated regions of the copolymer .sup.13 C NMR spectrum, defining the limits of the control parameter for the process, and operating the process to maintain the parameter within the defined limits. This is accomplished by adjusting the amount of ethylene fed to the secondary reactor and adjusting other process variables as required. Thermoplastic polyolefins, i.e., modified polypropylenes, having reduced hexane extractables and improved paint adhesion are also disclosed.

Abstract: A new catalyst useful in the polymerization of at least one olefin is disclosed. The catalyst comprises the product obtained by contacting silica, in random order, with (1) at least one hydrocarbon soluble magnesium-containing compound; and (2) a first modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides and mixtures thereof followed by a second modifying compound selected from the group consisting of halides having the structural formula SiH.sub.r X.sup.2.sub.s, where X.sup.2 is halogen; r is an integer of 1 to 3; and s is an integer of 1 to 3 with the proviso that the sum of r and s is 4, a hydrogen halide and mixtures thereof. The product of this step is contacted with a first titanium-containing compound having the structural formula Ti(OR).sub.m X.sub.n, where R is hydrocarbyl or cresyl; X is halogen; m is an integer of 1 to 4; and n is 0 or an integer of 1 to 3, with the proviso that the sum of m and n is 4.

Abstract: A catalyst component useful in the polymerization of olefins is disclosed. The catalyst component comprises the product obtained by steps of (a) contacting silica with at least one hydrocarbon soluble magnesium-containing compound; (b) contacting the product of step (a) with component (1), a heterocyclic fused ring compound substituted with at least one oxygen atom, and component (2), a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides and mixtures thereof, with the proviso that components (1) and (2) be present such that the molar ratio of component (2) to component (1) is at least about 4:1; and (c) contacting the product of step (b) with a titanium-containing compound having the structural formula TiX.sub.m (OR).sub.n, where X is halogen; R is hydrocarbyl; m is an integer of 1 to 4; and n is 0 or an integer of 1 to 3 with the proviso that the sum of m and n is 4.

Abstract: A novel catalyst support and a method for preparation thereof, characterized by the presence of selected amounts of a hydrocarbon soluble magnesium-containing compound applied to the support relative to solvent, wherein a surface uniformly and essentially continuously moistened with the solvated magnesium compound in a condition of incipient precipitation to permit the formation of a regular essentially continuous distribution of the magnesium compound onto and conforming to the support material. The drying process under these conditions is effective in maintaining to a high degree the effective surface area and pore volume of the material. The support containing the adsorbed magnesium is then dried in a controlled manner to essential incipient wetness conditions providing a regular spatial distribution of stacked reticular magnesium values at a level of one to five molecular monolayers on the support.

Abstract: A new catalyst component useful in the polymerization of at least one olefin is disclosed. The catalyst component comprises the product obtained by contacting silica, in random order, with (1) at least one hydrocarbon soluble magnesium-containing compound; and (2) a first modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides and mixtures thereof followed by a second modifying compound selected from the group consisting of halides having the structural formula SiH.sub.r X.sup.2.sub.s, where X.sup.2 is halogen; r is an integer of 1 to 3; and s is an integer of 1 to 3 with the proviso that the sum of r and s is 4, a hydrogen halide and mixtures thereof. The product of this step is contacted with a titanium-containing compound having the structural formula TiX.sup.1.sub.p (OR.sup.1).sub.q, where X.sup.1 is halogen; R.sup.

Abstract: A novel catalyst support and a method for preparation thereof, characterized by the presence of selected amounts of a hydrocarbon soluble magnesium-containing compound applied to the support relative to solvent, wherein a surface uniformly and essentially continuously moistened with the solvated magnesium compound is achieved in a condition of incipient precipitation to permit the formation of a regular essentially continuous distribution of the magnesium compound onto and conforming to the support material The drying process under these conditions is effective in maintaining to a high degree the effective surface area and pore volume of the material. The support containing the adsorbed magnesium is then dried in a controlled manner to essential incipient wetness conditions providing a regular spatial distribution of stacked reticular magnesium values at a level of one to five molecular monolayers on the support.

Abstract: A catalyst component useful in propylene polymerization in combination with a dialkyl aluminum halide cocatalyst comprises the product of reaction of TiCl.sub.3 which is substantially free of extraneous halide with a selected electron donor compound which is dissolved in a liquid hydrocarbon solvent in which the TiCl.sub.3 is dispersed. The electron donor compound is selected from certain organic acid esters, hindered phenolic compounds and silyl esters.The catalyst of the invention provides increased activity, molecular weight control, increased isotacticity of propylene polymer products and prevents catalyst feed line pluggage, among other advantages.

Abstract: A new catalyst component useful in the polymerization of at least one olefin is disclosed. The catalyst component comprises the product obtained by contracting silica, in random order, with (1) at least one hydrocarbon soluble magnesium-containing compound; and (2) a first modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides and mixtures thereof followed by a second modifying compound selected from the group consisting of halides having the structural formula SiH.sub.r X.sup.2.sub.s, where X.sup.2 is halogen; r is an integer of 1 to 3; and s is an integer of 1 to 3 with the proviso that the sum of r and s is 4, a hydrogen halide and mixtures thereof. The product of this step is contacted with a titanium-containing compound having the structural formula TiX.sup.1.sub.p (OR.sup.1).sub.q, where X.sup.1 is halogen; R.sup.

Abstract: The present invention relates to a silica supported magnesium-containing catalytic precursor of reduced SiOH content for reaction with a titanium halide to form a catalyst for the production of a stereospecific alpha olefin polymer characterized in that prior to reacting with titanium halide the magnesium-containing silica is reacted with at least one titanium compound having the formula Ti(R).sub.n X.sub.m or Ti(OR).sub.n X.sub.m where R is aryl, alkyl, alkaryl, or mixtures thereof; X is halogen; n is an integer of 1 to 4, and m is 0 or an integer of 1 to 3 with the provision that the sum of n and m is 4. It also relates to preparing the catalyst from the precursor.

Abstract: A catalyst component useful in propylene polymerization in combination with a dialkyl aluminum halide cocatalyst comprises the product of reaction of TiCl.sub.3 which is substantially free of extraneous halide with a selected electron donor compound which is dissolved in a liquid hydrocarbon solvent in which the TiCl.sub.3 is dispersed. The electron donor compound is selected from certain organic acid esters, hindered phenolic compounds and silyl esters.The catalyst of the invention provides increased activity, molecular weight control, increased isotacticity of propylene polymer products and prevents catalyst feed line pluggage, among other advantages.

Abstract: A catalyst useful in the polymerization of olefins is disclosed. The catalyst is produced by initially treating an inert inorganic compound to remove surface hydroxy groups. The thus treated inorganic compound is contacted with a hydrocarbon soluble magnesium compound in a second step. The product of this second step is contacted with a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides, hexaalkyl disilazanes and mixtures thereof in a third step. The product of this third step is contacted a vanadium compound having the structured formula V(O).sub.s X.sup.1.sub.4-s, where X.sup.1 is halogen; and s is 0 or 1, a first titanium-containing compound having the structural formula Ti(OR.sup.2).sub.n X.sup.2 m, where R.sup.2 is hydrocarbyl; X.sup.

Abstract: A process for making a propylene polymer which comprises polymerizing propylene under propylene polymerization conditions in the presence of a catalyst system which includes a catalyst component comprising (I) the product obtained by (a) treating silica to remove surface hydroxyl groups; (b) contacting said treated silica with (1) a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides and mixtures thereof; and (2) at least one hydrocarbon soluble magnesium-containing compound; (c) contacting the product of step (b) with at least one titanium-containing compound having the structural formula Ti(OR).sub.n X.sub.m, where R is aryl, alkyl or mixtures thereof; X is halogen; n is an integer of 1 to 4; m is 0 or an integer of 1 to 3; and the sum of m and n is 4; and (d) treating the product of step (c) with a titanium-containing compound having the structural formula TiX.sup.1.sub.p (OR.sup.1).sub.q, where X.sup.1 is halogen; R.sup.

Abstract: A catalyst useful in the polymerization of olefins is disclosed. The catalyst is produced by initially treating an inert inorganic compound to remove surface hydroxy groups. The thus treated inorganic compound is contacted with a hydrocarbon soluble magnesium compound in a second step. The product of this second step is contacted with a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides, hexaalkyl disilazanes and mixtures thereof in a third step. The product of this third step is contacted a vanadium compound having the structured formula V(O).sub.s X.sup.1.sub.4-s, where X.sup.1 is halogen; and s is 0 or 1, a first titanium-containing compound having the structural formula Ti(OR.sup.2).sub.n X.sup.2.sub.m, where R.sup.2 is hydrocarbyl; X.sup.

Abstract: A new catalyst useful in the polymerization of olefins, especially propylene, is disclosed. The catalyst is produced by contacting at least one hydrocarbon soluble magnesium compound with a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides and mixtures thereof. The product of this contact is contacted with a first titanium-containing compound having the structural formula Ti(OR).sub.n X.sub.m, where R is hydrocarbyl; X is halogen; n is an integer of 1 to 4; and m is 0 or an integer of 1 to 3, with the proviso that the sum of n and m is 4, and a second titanium-containing compound having the structural formula Tix.sup.1.sub.p (OR.sup.1).sub.q where X.sup.1 is halogen; R.sup.1 is hydrocarbyl; p is an integer of 1 to 4; and q is 0 or an integer of 1 to 3, with the provisos that the sum of p and q is 4 and that the first and second titanium-containing compounds are not identical.

Abstract: A catalyst comprising the product formed by(a) treating silica to remove surface hydroxyl groups;(b) contacting said treated silica with (1) a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides and mixtures thereof; and (2) at least one hydrocarbon soluble magnesium-containing compound selected from the group consisting of hydrocarbyloxy magnesium, hydrocarbyloxymagnesium halides and mixtures thereof; said contacting steps (1) and (2) occurring in random order;(c) contacting the product of step (b) with at least one titanium-containing compound having the structural formula Ti(OR).sub.n X.sub.m, where R is aryl, alkyl or mixtures thereof; X is halogen; n is an integer of 1 to 4; m is 0 or an integer of 1 to 3; and the sum of m and n is 4; and(d) treating the product of step (c) with a titanium-containing compound having the structural formula TiX.sup.1.sub.p OR.sup.1).sub.q, where X.sup.1 is halogen; R.sup.

Abstract: A method is disclosed for increasing the productivity of an olefin polymerization catalyst. The catalyst contains an aluminum chloride co-crystallized titanium halide. The catalyst component is simultaneously washed with an olefin and electron donor is added to the catalyst component, thereby greatly increasing its productivity without significantly adversely affecting the crystallinity of the polymer produced.

Abstract: A method is disclosed for increasing the productivity of an olefin polymerization catalyst. The catalyst contains an aluminum chloride co-crystallized titanium halide modified with an electron donor containing an ester group. The catalyst component is washed with an olefin, thereby greatly increasing its productivity without significantly adversely affecting the crystallinity of the polymer produced.

Abstract: A method is disclosed for increasing the productivity of an olefin polymerization catalyst. The catalyst contains an aluminum chloride co-crystallized titanium halide modified with an electron donor containing an ester group. The catalyst component is washed with an olefin and then electron donor is added back to the washed catalyst component, thereby greatly increasing its productivity without significantly adversely affecting the crystallinity of the polymer produced.

Abstract: A supported catalyst for the polymerization and copolymerization of ethylene which comprises a reduced tetravalent titanium compound, an aluminum alkyl and a substituted polystyrene resin support. After treatment of the polymer with magnesium salts, either the titanium component or the aluminum component is prereacted with the substituent groups of the polystyrene resin which are selected from the group consisting of hydroxymethyl, chloromethyl, and sulphonate.