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Sjardijn Willem, Kramer Arris Herman: Bulk polymerization of dicyclopentadiene.. Shell Int Research, May 20, 1987: EP0222432-A1 (11 worldwide citation)

1. A process for the bulk polymerization of dicyclopentadiene which comprises contacting dicyclopentadiene with a catalyst comprising a) a tungsten compound of the formula wherein R represents a bulky alkyl group, having at least 3 carbon atoms or a hydrogen atom, with the proviso that at least one ...


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Van Der Bend Herman Th, Sjardijn Willem: Preparation of ticl component of olefin polymerization catalyst. Shell Oil Company, December 31, 1974: US3857795 (7 worldwide citation)

Titanium trichloride-containing compositions for use as catalyst component in stereoregular olefin polymerization are prepared by gradual addition of a solution of titanium tetrachloride to a solution of trialkyl aluminum in certain low-boiling inert diluents. The mixture is prepared and held at a t ...


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Sjardijn Willem, Van Der Linden Lemmers Wilhelm: Polymerization of norbornene derivatives and catalytic system suitable for use therein.. Shell Int Research, October 11, 1989: EP0336486-A2 (4 worldwide citation)

A process for the polymerization of norbornene derivatives, which comprises contacting the monomer(s) with a catalytic system, obtainable by combining the following two components: component 1 - a tungsten compound obtainable by combining a tungsten halide with a phenol compound which is not substit ...


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Binsbergen Frederik Lambertus, Sjardijn Willem, Berghaus Ulrich: Anionic extruder polymerization.. Shell Int Research, January 13, 1993: EP0522641-A2 (3 worldwide citation)

A process for preparing polymers by (co)polymerizing with an anionic initiator in an extruder a monomer feed comprising one or more ethylenically unsaturated compounds, wherein the monomer feed contains at least 50 %by weight of one or more ethylenically unsaturated compounds based on the total weig ...


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Sjardijn Willem, Snel Johannes Jacobus Maria: Polymerization of bulky norbornene derivatives and polymers obtainable therewith.. Shell Int Research, September 5, 1990: EP0385556-A2 (3 worldwide citation)

A process for the production of thermoset copolymers, having tailored product properties and more particularly a predetermined increase of the glass-transition temperature, comprising contacting at least one monomer of the formulae: with a metathesis catalyst system, obtainable by combining at least ...


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Sjardijn Willem, Snel Johannes Jacobus Maria: Process for the polymerization of structurally different monomers.. Shell Int Research, June 13, 1990: EP0372599-A2 (1 worldwide citation)

A process for the polymerization of structurally different monomers, comprising the polymerization of an ethylenically unsaturated cyclic monomer having the unsaturations in at least 1 ring of atoms, in the monomer mixture, in the presence of a metathesis-ring opening catalyst system, followed by or ...


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Sjardijn Willem, Seelen Kruijssen Josepha Maira: Polymerization of cycloolefins and catalytic system suitable for use therein.. Shell Int Research, February 24, 1993: EP0528496-A2

A catalyst system for the polymerization of cyclic olefins, comprising (1) a tungsten compound which is obtainable by combining a tungsten halide and/or a tungsten oxyhalide with a phenol compound which is substituted with a bulky alkyl group at the positions ortho with respect to the hydroxyl group ...


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Sjardijn Willem, Van Der Linden Lemmers Wilhelm, Reynhout Marinus Johannes, Schadenberg Hendrik: Viscosity modification of mineral oils.. Shell Int Research, November 22, 1990: EP0398448-A2

Mineral oil composition comprising an additive which has been prepared by copolymerizing a mixture of at least two alpha-olefins with at least 16 carbon atoms each in the presence of a catalyst comprising a) a tetravalent titanium compound on a magnesium dihalide support and an alkyl ester of an aro ...