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 ...

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.

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 ...

Harlin Ali, Alastalo Kauno, Korhonen Esa, Kivelae Jouni: Process and apparatus for preparing propylene homopolymers and copolymers. Borealis, December 30, 1998: EP0887379-A1 (194 worldwide citation)

Described herein is a process and an apparatus for preparing propylene homopolymers and copolymers, which comprises polymerizing propylene optionally with comonomers in the presence of a catalyst at elevated temperature and pressure in at least one slurry reactor and at least one gas phase reactor, ...

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.

Osborne K McKinney, David A Eversdyk, Michael E Rowland: Process for producing homogeneous modified copolymers of ethylene/alpha-olefin carboxylic acids or esters. The Dow Chemical Company, January 29, 1991: US04988781 (142 worldwide citation)

A homogeneous, random interpolymer of ethylene and an alpha-olefinically unsaturated carboxylic acid or ester having a melt flow rate in the range of about 0.1 to about 300 g/10 minutes, as determined by ASTM D-1238 (190.degree. C./2160 g), is improved during its manufacture when made in a substanti ...

R William Fowells: Method of making spunbonded webs from linear low density polyethylene. Crown Zellerbach Corporation, Stanley M Teigland, February 17, 1987: US04644045 (133 worldwide citation)

Spunbonded nonwoven webs having excellent properties, particularly softness, can be made from linear low density polyethylene having a critical combination of certain key properties. These properties are percent crystallinity, cone die melt flow, die swell, relation of die swell to melt index, and p ...

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 ...


Scholten Henricus Paulus Huber, Aten Willem Cornelis, Sonderman Marc Stephen, Vermeulen Jan: Polymeric products of ethylene and vinyl esters.. Shell Int Research, December 21, 1988: EP0295727-A2 (117 worldwide citation)

Latices prepared by emulsion polymerisation comprise an interpolymer of (a) vinyl acetate, (b) ethylene and (c) the vinyl ester of a tertiary aliphatic carboxylic acid in which the acid moiety contains 9 carbon atoms. Such latices are particularly suitable for use in emulsion paints.