Abstract: This invention relates to a catalyst composition comprising the reaction product of (a) an inorganic substrate containing a reactive hydroxyl group and selected from the group consisting of silica compounds, alumina compounds, and combinations thereof, (b) a catalyst containing terminal unsaturation and selected from the group consisting of 4-dialkylamino pyridines, 4-(N-arylalkyl-N-alkyl)amino pyridines, and combinations thereof, and (c) a hydrosilane. Also disclosed is a process for making the catalyst composition, as well as the catalyst composition by empirical structural formula.

Abstract: This invention relates to a process for preparing a dimer by the steps of: (a) cyclodimerizing a polyisocyanate in the presence of a dimerization catalyst which is covalently bound to an insoluble inorganic matrix by contacting said polyisocyanate with said catalyst at a temperature of between about 20 and about 135.degree. C. in a reaction to form an uretidione-containing cyclodimerized isocyanate wherein a portion of the isocyanate moieties comprising said polyisocyanate are converted to uretidione groups, and (b) separating said catalyst from said cyclodimerized isocyanate in order to stop said reaction after a desired amount of isocyanate moieties in said polyisocyanate have been converted to uretidione moieties.

Abstract: A catalyst component for polymerizing ethylene alone or with another alpha-olefin having from 3 to 18 carbon atoms at temperatures greater than about 150.degree. C. which catalyst component is the product obtained by treating at least one dehydrated particulate support material, such as silica, having an average particle size from about 0.05 to about 20 microns, preferably 1.0 to 10.0 microns, with(a) at least one dihydrocarbyl magnesium compound wherein the hydrocarbyl groups can be the same or different, such as butyl ethyl magnesium,(b) a transistion metal compound of Groups IVa, Va, or VIa of the Periodic Table, such as, for example, titanium tetrachloride, and (c) ethyl aluminum dichloride. In a preferred embodiment the particulate support material is treated with a halogenating agent prior to treatment with the transition metal compound.

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 catalyst composition 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.q [Filler].sub.rwhereinED 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.5r 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: An improved method for preparing ethylene polymers with certain supported chromium [II] catalysts wherein the improvement comprises employing said catalyst in the presence of phenolic antioxidant.