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Stevens James C, Vanderlende Daniel D: Method of making interpolymers and products made therefrom. Dow Global Technologies, January 7, 2004: EP1377613-A2 (2 worldwide citation)

A polymerization process comprises contacting one or more olefinic comonomers in the presence of at least a high molecular weight catalyst and at least a low molecular weight catalyst in a single reactor; and effectuating the polymerization of the olefinic comonomers in the reactor to obtain an olef ...


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Degroot Alexander W, Stevens James C, Desjardins Sylvie Y, Weinhold Jeffrey, Carnahan Edmund, Gillespie David, Vanderlende Daniel D: High melt strength polymers and method of making same. Dow Global Technologies, April 28, 2004: EP1412398-A2 (2 worldwide citation)

A polymerization process comprises contacting one or more olefinic comonomers in the presence of at least a high molecular weight catalyst and at least a low molecular weight catalyst in a single reactor; and effectuating the polymerization of the olefinic comonomers in the reactor to obtain an olef ...


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Stevens James C, Vanderlende Daniel D, Chang Andy C: Isotactic propylene copolymer fibers, their preparation and use. Dow Global Technologies, September 8, 2004: EP1453994-A1 (2 worldwide citation)

Fibers comprising a propylene homopolymer or a copolymer of propylene and at least one of ethylene and one or more unsaturated comonomers exhibit desirable properties. The homopolymers are characterized as having C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks ...


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Frazier Kevin A, Vosejpka Paul A, Boone Harold W, Stevens James C: High activity olefin polymerization catalyst and process. Dow Global Technologies, Frazier Kevin A, Vosejpka Paul A, Boone Harold W, Stevens James C, DELINE Douglas N, November 18, 2004: WO/2004/099268 (2 worldwide citation)

Group 4 metal complexes useful as addition polymerization catalysts of the formula: (I) wherein G1 is a group containing from 1 to 40 atoms not counting hydrogen; T is a divalent bridging group of from 10 to 30 atoms not counting hydrogen, selected from mono- or di- aryl- substituted methylene or si ...


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Stevens James C, Fordyce William A: Process for propylene dimerization.. Dow Chemical, March 9, 1988: EP0258973-A2 (1 worldwide citation)

4-methyl-1-pentene is produced via the catalyst dimerization of propylene. Using a catalyst comprising at least one element selected from uranium and the rare earth metals. The selectivity to 4-methyl-1-pentene usually is at least 94 mole percent. The preferred catalysts are uranium and rare earth d ...


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Nickias Peter N, Mcadon Mark H, Patton Jasson T, Friedrichsen Bernard P, Soto Jorge, Stevens James C, Vanderlende Daniel D: Complexes metalliques contenant de lindenyle substitue et polymerisation des olefines, Substituted indenyl containing metal complexes and olefin polymerization process. The Dow Chemical Company, Dow Global Technologies, SMART & BIGGAR, May 1, 1997: CA2229608 (1 worldwide citation)

Group 4 metal complexes comprising an indenyl group substituted in the 2 or 3 position with at least one group selected from hydrocarbyl, perfluoro substituted hydrocarbyl, silyl, germyl and mixtures thereof, said indenyl group further being covalently bonded to the metal by means of a divalent liga ...


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Lai Shih Yaw, Wilson John R, Knight Georges W, Stevens James C, Chum Pak Wing Steve: Elastic substantially linear olefin polymers. The Dow Chemical Company, Lai Shih Yaw, Wilson John R, Knight Georges W, Stevens James C, Chum Pak Wing Steve, KRUPP Stephen P, April 29, 1993: WO/1993/008221 (1 worldwide citation)

Elastic substantially linear olefin polymers are disclosed which have processability similar to highly branched low density polyethylene (LDPE), but the strength and toughness of linear low density polyethylene (LLDPE). The polymers have processing indices (PI's) less than or equal to 70 percent of ...


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Stevens James C, Vanderlende Daniel D, Ansems Patricia: Crystallization of polypropylene using a semi-crystalline, branched or coupled nucleating agent. Dow Global Technologies, Stevens James C, Vanderlende Daniel D, Ansems Patricia, PLOTECHER Gary R, May 15, 2003: WO/2003/040095 (1 worldwide citation)

A method of nucleating a propylene homo- or copolymer, the method comprising contacting the propylene polymer with a semi-crystalline branched or coupled polymeric nucleating agent under nucleation conditions. In one embodiment, the propylene homopolymer is characterized as having 13C NMR peaks corr ...


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Stevens James C, Vanderlende Daniel D, Ansems Patricia: Impact resistant polymer blends of crystalline polypropylene and partially crystalline, low molecular weight impact modifiers. Dow Global Technologies, Stevens James C, Vanderlende Daniel D, Ansems Patricia, PLOTECHER Gary R, May 15, 2003: WO/2003/040233 (1 worldwide citation)

Polymer blends that exhibit good impact resistance comprise a crystalline polypropylene matrix and a partly crystalline copolymer impact modifier with a molecular weight lower than that of the matrix polymer. The matrix polymer can comprise any crystalline propylene homo− or copolymer. The impact mo ...