Abstract: A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is &pgr;-bonded to M. The key ligand is made in two steps from readily available indanones and aryl hydrazines. Reaction of its anion with a source of the metal completes a remarkably simple synthetic route to a new family of single-site olefin polymerization catalysts.

Abstract: A method of preparing a sterile article is disclosed. A polymer having a halogen-containing repeating unit is prepared that contains about 0.

Abstract: Disclosed is a solution that comprises

Abstract: Disclosed is a method of inhibiting the discoloration of a halogen-containing polymer, particularly poly(vinyl chloride), after exposure to gamma radiation. About 0.0001 to about 5 wt % of a dithiocarbamate or a dithiophosphate stabilizer is added to the polymer. The stabilizer can be added during polymerization or during compounding. Also disclosed is a composition of a halogen-containing polymer and a dithiocarbamate or dithiophosphate stabilizer.

Abstract: Disclosed is a method of inhibiting the formation of scale on reactor surfaces in contact with a polymerizing vinyl monomer comprising contacting said monomer with a terpolymer which comprises the condensation reaction product of (A) an aromatic compound that contains the group where Q is OR or SR and R is hydrogen, alkyl from C1 to C15, or aryl, alkaryl, or aralkyl from C6 to C15: (B) about 0.1 to about 10 moles of a carbonyl compound per mole of said aromatic compound; and (C) about 0.1 to about 10 moles of a thiourea per mole of said aromatic compound.

Abstract: A single-site olefin polymerization catalyst is described. The catalyst comprises an activator and an organometallic compound that includes an amine derivative ligand. The catalyst is highly productive, incorporates comonomers well, and gives polymers with narrow molecular weight distributions.

Abstract: Olefin polymerization is performed in the presence of a catalyst comprising a compound of the formula wherein M is a Group 3-10 transition metal; A is O, S, N—R″, or P—R″; L is an anionic ligand; X is hydride, halide, C1-C20 alkoxy, siloxy, hydrocarbyl, or dialkylamido; R, R′, and R″, which are the same or different, are selected from the group consisting of hydrogen and C1-C20 hydrocarbyl; and m+n equals the valency of M minus 1; and an activator.

Abstract: A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is -bonded to M. The key ligand is made in two steps from readily available indanones and aryl hydrazines. Reaction of its anion with a source of the metal completes a remarkably simple synthetic route to a new family of single-site olefin polymerization catalysts.

Abstract: A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is &pgr;-bonded to M. The key ligand is made in two steps from readily available indanones and aryl hydrazines. Reaction of its anion with a source of the metal completes a remarkably simple synthetic route to a new family of single-site olefin polymerization catalysts.

Abstract: Disclosed is a catalyst having the general formula where L is a ligand having the formula L′ is L, Cp, Cp*, indenyl, fluorenyl, NR2, OR, or halogen, L can be bridged to L; X is halogen, NR2, OR, or alkyl from C1 to C12, M is zirconium or hafnium, R is alkyl from C1 to C12 or aryl from C6 to C12, R1 is R, alkaryl from C6 to C12, aralkyl from C6 to C12, hydrogen, or Si(R)3, R2 is R1, halogen, COR, COOR, SOR, or SOOR, R3 is R2, OR, N(R)2, SR, or a fused ring system, Cp is cyclopentadienyl, Cp* is pentamethylcyclopentadienyl, n is 0 to 3, and LB is an optional Lewis base. Also disclosed is a method of making a poly-&agr;-olefin comprising polymerizing an &agr;-olefin monomer using a catalyst such as that described above where M can be titanium, zirconium, or hafnium.

Abstract: A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition or lanthanide metal, M, and at least one homoaromatic anionic ligand that is &pgr;-bonded to M. Molecular modeling results indicate that single-site catalysts based on homoaromatic anionic ligands (e.g., bicyclo[3.2.1]octa-2,6-dienyl) will rival the performance of catalysts based on cyclopentadienyl and substituted cyclopentadienyl ligands.

Abstract: Disclosed is a method of polymerizing vinyl chloride monomer using a catalyst having the general formula where L is a ligand covalently bonded to the cobalt atom, each D is independently selected from donor ligands, R is hydrogen, hydrocarbon from C1 to C30, or hydrohalocarbon from C1 to C30, and X− is an anion. The catalyst is activated by the addition of an acid.

Abstract: A single-site olefin polymerization catalyst is described. The catalyst comprises an activator and an organometallic compound that includes an amine derivative ligand. The catalyst is highly productive, incorporates comonomers well, and gives polymers with narrow molecular weight distributions. The compound is of the formula wherein M is a group 3-10 metal; A is O, S, N—R″ or P—R″; L is cyclopentadienyl, boraaryl, pyrrolyl, azaboralinyl, quinolinyl, or pyridinyl, or is another RR′N—A− or RR′C═N—A′ group; X is a hydride, halide, alkoxy, siloxy, hydrocarbyl or amido; R,R′ and R″ are hydrogen or hydrocarbyl; m+n equals the valence of M minus 1.

Abstract: Single site nitrogen and oxygen metallacyclic catalysts comprising at least two polymerization-stable anionic ancillary ligands and a Group 4-10 metal are disclosed wherein the nitrogen or oxygen heterocyclic catalyst is produced by dimerizing an alkylamido or trimerizing a metal containing oxane. The polymerization-stable anionic ancillary ligands are preferably either cyclopentadienyl, borataaryl, pyrrolyl, azaboralinyl, pyridinyl, or a quinolinyl ring. In a preferred embodiment, the invention relates to catalysts of the formula: ##STR1## wherein M is a transition metal of Groups 3-10;L is a polymerization-stable anionic ancillary ligand;R is a hydrocarbyl group containing up to about 12 carbon atoms optionally substituted with halogen; andE is R or halogen, alkoxy from C.sub.1 to C.sub.20, siloxy from C.sub.1 to C.sub.20, N(R).sub.2, hydrogen or another univalent anionic ligand, or mixtures thereof.

Abstract: Catalysts for the polymerization of olefins contain units of the formula: wherein ##STR1## each R is independently selected from a C.sub.1 to C.sub.10 aliphatic or cycloaliphatic group or a C.sub.6 to C.sub.18 aryl, aralkyl, or alkaryl;each R.sup.2 is independently selected from hydride, R, and Q radicals wherein at least one R.sup.2 is Q;Q has the general formulaLM.sup.p L'.sub.r X.sub.p-r-1whereinL is a monoanionic aromatic ancillary ligand pi-bonded to M and covalently bonded to Si;L' is a monoanionic aromatic ancillary ligand pi-bonded to M and optionally bonded to L through a covalent bridging group;M is a metal selected from Groups 3-10 of the Periodic Table or lanthanides;X is independently selected from a hydride radical, halide radical, hydrocarbyl radical, halocarbyl radical, silahydrocarbyl, alkoxy radical, aryloxy radical, alkylsulfonate radical, arylsulfonate radical or (R).sub.

Abstract: Disclosed is a method of inhibiting the formation of scale on reactor surfaces in contact with a polymerizing vinyl monomer comprising contacting said monomer with a terpolymer which comprises the condensation reaction product of(A) an aromatic compound that contains the group ##STR1## where Q is OR or SR and R is hydrogen, alkyl from C.sub.1 to C.sub.15, or aryl, alkaryl, or aralkyl from C.sub.6 to C.sub.15 :(B) about 0.1 to about 10 moles of a carbonyl compound per mole of said aromatic compound; and(C) about 0.1 to about 10 moles of a thiourea per mole of said aromatic compound.

Abstract: Disclosed is a method of preparing a sterile medical article. A poly(vinyl chloride) or polyvinylidene chloride polymer is produced that contains about 0.001 to about 5 wt % of a metal complex having at least one anionic ligand that has at least one resonance structure in which the charge is localized on a carbon atom. A medical article is fabricated from the chlorinated polymer and the medical article is exposed to gamma radiation.

Abstract: Single-site catalyst systems containing alkylimido ligands are disclosed. The catalyst systems comprise a co-catalyst and a Group 3-10 transition metal catalyst. The catalyst includes an alkyl- or arylimido ligand and a polymerization-stable, anionic ligand selected from boraaryl, pyrrolyl, and azaborolinyl. When used to polymerize olefins, the catalyst systems are highly productive, give good comonomer incorporation, and give polymers with narrow molecular weight distributions.

Abstract: A catalysis system containing an olefin polymerization catalyst having at least one Group 3 to Group 10 transition metal or one of the Lanthanide series of the Periodic Table and an organic support is homogeneous and has particular applicability in the production of polyolefins having narrow molecular weight distribution. The support of the catalysis system is the reaction product of a silicone and a polyamine. The catalysis system has high thermal stability.

Abstract: Disclosed is a catalyst having the general formula ##STR1## where Q is a ligand containing the ring ##STR2## R is hydrogen, N(R').sub.2, OR', or R', each R' is independently selected from alkyl from C.sub.1 to C.sub.10, aryl from C.sub.6 to C.sub.15, alkaryl C.sub.7 to C.sub.15, and aralkyl from C.sub.7 to C.sub.15, each X is independently selected from hydrogen, halogen, alkoxy from C.sub.1 to C.sub.10, dialkylamino from C.sub.1 to C.sub.10, methyl, ##STR3## each R.sub.1 is independently selected from halogen, alkoxy from C.sub.1 to C.sub.10, and R', L is ##STR4## Q, or X, where one .pi.-ligand can be bridged to second .pi.-ligand, B is an optional base, "n" is 0 to 5, and M is a Group 3-10 metal.