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Stevens James C, Timmers Francis J, Wilson David R, Schmidt Gregory F, Nickias Peter N, Rosen Robert K, Knight George W, Lai Shih Yaw: Constrained geometry addition polymerization catalysts, processes for their preparation, precursors therefor, methods of use, and novel polymers formed therewith.. Dow Chemical, March 13, 1991: EP0416815-A2 (544 worldwide citation)

Metal coordination complexes comprising a metal of Group 3 (except Sc), 4-10 or the lanthanide series and a delocalized PI -bonded moiety have said moiety substituted with a constrain-inducing moiety which reduces the angle at the metal between the centroid of said PI -bonded moiety and at least one ...


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Arthur William Anderson, Gelu Stoeff Stamatoff: Hydrocarbon interpolymer compositions. E I Du Pont de Nemours and Company, Roger A Hines, February 28, 1978: US04076698 (442 worldwide citation)

Interpolymers composed of ethylene and higher olefinic hydrocarbons having 5 to 18 carbon atoms per molecule. Said interpolymers being useful as molding, pipes and wire cotaings.


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Ewen John Alexander, Welborn Howard Curtis Jr: Process and catalyst for polyolefin density and molecular weight control.. Exxon Research Engineering Co, December 27, 1984: EP0129368-A1 (420 worldwide citation)

Catalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) and an alumoxane are employed in a process of producing polyolefins of controlled molecular weight.


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Turner Howard William, Hlatky Gregory George: Catalysts, method of preparing these catalysts, and polymerization processes wherein these catalysts are used.. Exxon Chemical Patents, August 3, 1988: EP0277003-A1 (238 worldwide citation)

A catalyst is prepared by combining a bis(cyclopentadienyl)zirconium compound which may be represented by one of the following general formulae: (A-Cp)MX1X2 (A-Cp)MX'1X'2 (A-Cp)ML; and (Cp*)(CpR)MX1 wherein: M is a metal selected from the Group consisting of titanium (Ti), zirconium (Zr) and hafnium ...


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Charles Cozewith, Sudhin Datta, Weiguo Hu: Propylene ethylene polymers. ExxonMobile Chemical Patents, S D Prodnuk, February 25, 2003: US06525157 (225 worldwide citation)

Ethylene propylene copolymers, substantially free of diene, are described. The copolymers will have a uniform distribution of both tacticity and comonomer between copolymer chains. Further, the copolymers will exhibit a statistically insignificant intramolecular difference of tacticity. The copolyme ...


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Canich Jo Ann Marie: Olefin polymerization catalysts.. Exxon Chemical Patents, April 3, 1991: EP0420436-A1 (192 worldwide citation)

The invention is a catalyst system including a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.


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Dietz Richard E: Olefin polymerization catalyst. Phillips Petroleum Company, June 3, 1975: US3887494 (122 worldwide citation)

A method for preparing a composition of matter comprising silica and titanium, convertible to a catalyst suitable for olefin polymerization by the addition of chromium and the process performable therewith, the preparation involving adding an alkali metal silicate to an acid containing a titanium co ...


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Kenichi Tominari, Hiroshi Inoue, Masayuki Sakai: Linear ethylene copolymer. Mitsui Petrochemical, Sherman and Shalloway, May 26, 1987: US04668752 (119 worldwide citation)

Ethylene/C.sub.4 -C.sub.20 alpha-olefin copolymers are disclosed which have new characteristics in regard to composition distribution, degree of branching, randomness and crystallinity by DSC melting points. These copolymers have excellent transparency, impact strength, tear strength, blocking resis ...


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