1
Ramesh Krishnamurti, Sandor Nagy, Bradley P Etherton: Borabenzene based olefin polymerization catalysts. Occidental Chemical Corporation, Richard D Fuerle, September 10, 1996: US05554775 (113 worldwide citation)

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.s ...


2
Bradley P Etherton, Sandor Nagy: Polymerization catalysts based on transition metal complexes with ligands containing pyrrolyl ring. Occidental Chemical Corporation, Wayne A Jones, Richard D Fuerle, July 23, 1996: US05539124 (97 worldwide citation)

Disclosed is an azametallocene polymerization catalyst having the general formula ##STR1## where L is a ligand, or mixture of ligands, each having 4 to 30 carbon atoms and containing at least two fused rings, one of which is a pyrrolyl ring, Cp is a ligand containing a cyclopentadienyl group, B is a ...


3
Shaotian Wang, Bradley P Etherton, Karen E Meyer, Michael W Lynch, Linda N Winslow, Leonard V Cribbs, Jia Chu X Liu: Supported olefin polymerization catalysts. Equistar Chemicals, Kevin M Carroll, Jonathan L Schuchardt, April 3, 2001: US06211311 (65 worldwide citation)

A supported olefin polymerization catalyst system and a method of making it are disclosed. The catalyst system comprises: (a) a support chemically treated with an organoaluminum, organosilicon, organomagnesium, or organoboron compound; (b) a single-site catalyst that contains a polymerization-stable ...


4
Bradley P Etherton, James J McAlpin, Terrence Huff, Edward N Kresge: Unsaturated propylene/.alpha., .omega.-diene copolymers. Exxon Chemical Patent, Myron B Kurtzman, Douglas W Miller, April 2, 1996: US05504171 (47 worldwide citation)

Disclosed are unsaturated .alpha.-olefin/.alpha.,.omega.-diene copolymers, and a method of preparation thereof. The copolymers are generally crystalline, free of gel and cross-links, and contain unsaturated side chains and long chain branching. The copolymers contain up to 5 mole percent diene incor ...


5
Ramesh Krishnamurti, Sandor Nagy, Bradley P Etherton: Method of polymerizing olefins using borabenzene catalysts. Lyondell Petrochemical Company, Liddell Sapp Zivley Hill & LaBoon L, June 10, 1997: US05637659 (45 worldwide citation)

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.s ...


6
Bradley P Etherton, James J McAlpin, Terrence Huff, Edward N Kresge: Method for preparation of unsaturated alpha-olefin copolymers. Exxon Chemical Patents, D W Miller, May 7, 1996: US05514761 (43 worldwide citation)

Disclosed are unsaturated .alpha.-olefin/.alpha., .omega.-diene copolymers, and a method of preparation thereof. The copolymers are generally crystalline, free of gel and cross-links, and contain unsaturated side chains and long chain branching. The copolymers contain up to 5 mole percent diene inco ...


7
Sandor Nagy, Bradley P Etherton, Ramesh Krishnamurti, John A Tyrell: Single-site catalysts for olefin polymerization. Equistar Chemicals, Jonathan L Schuchardt, May 15, 2001: US06232260 (41 worldwide citation)

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 lig ...


8
Bradley P Etherton, Anthony D Hamer: Supported polyolefin catalyst for the polymerization of ethylene under high temperatures. Exxon Research & Engineering Co, M B Kurtzman, April 2, 1985: US04508843 (33 worldwide citation)

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, havi ...


9
Bradley P Etherton, Ramesh Krishnamurti, John A Tyrell, Sandor Nagy: .alpha.-olefin polymerization catalysts. Lyondell Petrochemical Company, Liddell Sapp Zivley Hill & LaBoon, May 26, 1998: US05756611 (33 worldwide citation)

A catalyst useful in the polymerization of .alpha.-olefins comprises the reaction product of an alcohol having the general formula ##STR1## with an organometallic compound having the general formula


10
Leonard V Cribbs, Bradley P Etherton, Mark P Mack, James H Meas Jr: Olefin polymerization process. Equistar Chemicals, Shao Guo, October 3, 2000: US06127484 (32 worldwide citation)

A multiple stage or multiple zone process for making olefin polymers is disclosed. A single-site catalyst, preferably one that contains a heteroatomic ligand, is used in the first stage or zone, and a Ziegler-Natta catalyst is used at a higher temperature in later stages or zones. A parallel multipl ...