1
Qing Yang, Max P McDaniel, Joel L Martin, Tony R Crain, Randy S Muninger, Jerry T Lanier, Jeff S Fodor, Paul J Deslauriers, Chung C Tso, David C Rohlfing: Process for producing broader molecular weight distribution polymers with a reverse comonomer distribution and low levels of long chain branches. Chevron Phillips Chemical Company, Merchant & Gould P C, February 14, 2012: US08114946 (72 worldwide citation)

The present invention provides a polymerization process which is conducted by contacting an olefin monomer and at least one olefin comonomer in the presence of hydrogen and a metallocene-based catalyst composition. Polymers produced from the polymerization process are also provided, and these polyme ...


2
Qing Yang, Max P McDaniel, Joel L Martin, Tony R Crain, Randy S Muninger, Jerry T Lanier, Jeff S Fodor, Paul J Deslauriers, Chung C Tso, David C Rohlfing: Process for producing broader molecular weight distribution polymers with a reverse comonomer distribution and low levels of long chain branches. Chevron Phillips Chemical Company, Merchant & Gould P C, July 2, 2013: US08475899 (4 worldwide citation)

The present invention provides a polymerization process which is conducted by contacting an olefin monomer and at least one olefin comonomer in the presence of hydrogen and a metallocene-based catalyst composition. Polymers produced from the polymerization process are also provided, and these polyme ...


3
Chung C Tso, Joe W Ryker: Preparation of 2,5-dimethylhexane-2,5-dihydroperoxide and derivatives thereof. Phillips Petroleum Company, Lucas K Shay, May 11, 1993: US05210320 (2 worldwide citation)

A one-step process for preparing 2,5-dimethylhexane-2,5-dihydroperoxide and its alkyl derivatives comprises: (1) adding sulfuric acid to a 60-70% hydrogen peroxide solution to form a first reaction mixture where the first mixture is controlled at a temperature in the range of from about -10.degree. ...


4
Chung C Tso, Robert L Wynn: Benzylic oxidation and catalyst therefor. Phillips Petroleum Company, Lucas K Shay, January 18, 1994: US05280001 (2 worldwide citation)

Oxidation of alkylaromatics having a benzylic hydrogen atom is catalyzed by a catalyst comprising a palladium salt, a metal persulfate, a third metal salt, and a tin salt in a carboxylic acid for a period of time sufficient to convert the alkylaromatics to their corresponding oxidized derivatives. T ...


5
Chung C Tso, Melvin Hildebrand, Paul J DesLauriers, Youlu Yu: Ultra high molecular weight polyethylene fractions having narrow molecular weight distributions and methods of making and using the same. Chevron Phillips Chemical Company, Conley Rose P C, Rodney B Carroll, Cheryl L Huseman, April 6, 2010: US07691633 (1 worldwide citation)

Polymer fractions such as polyethylene fractions can be produced that have a PDI less than about 2.3 and a Mw greater than about 1,000,000 g/mol, 3,000,000 g/mol, or 6,000,000 g/mol. Such polyethylene fractions are separated from a UHMWPE parent polymer by first dissolving the parent polymer in a re ...


6
Chung C Tso, Melvin Hildebrand, Paul J DesLauriers, Youlu Yu: Ultra high molecular weight polyethylene fractions having narrow molecular weight distributions and methods of making and using the same. Chevron Phillips Chemical Company, Conley Rose P C, Rodney B Carroll, Cheryl L Huseman, July 10, 2007: US07241620 (1 worldwide citation)

Polymer fractions such as polyethylene fractions can be produced that have a PDI less than about 2.3 and a Mw greater than about 1,000,000 g/mol, 3,000,000 g/mol, or 6,000,000 g/mol. Such polyethylene fractions are separated from a UHMWPE parent polymer by first dissolving the parent polymer in a re ...


7
Errun Ding, Chung C Tso, Youlu Yu, Qing Yang, Richard M Buck: Ziegler-natta—metallocene dual catalyst systems with activator-supports. Chevron Phillips Chemical Company, Merchant & Gould P C, March 27, 2018: US09926393

Catalyst systems having both a metallocene catalyst component and a Ziegler-Natta component are disclosed. Such catalyst systems can contain a metallocene compound, an activator-support, an organoaluminum compound, and a Ziegler-Natta component comprising titanium supported on magnesium chloride.


8
Youlu Yu, Chung C Tso, David C Rohlfing, Paul J Deslauriers, Melvin Hildebrand, Max P McDaniel, Qing Yang: Hyperbranched polymers and methods of making and using same. Chevron Phillips Chemical Company, Conley Rose P C, Rodney B Carrolll, Cheryl L Huseman, January 13, 2015: US08933175

A composition comprising a polyethylene wherein the composition is enriched in polymer molecules having topological variations by an enrichment factor ω and wherein the composition displays a long chain branching frequency of greater than about 0.5 long chain branches per 1000 total carbon atoms. A ...


9
Youlu Yu, Chung C Tso, Paul J DesLauriers: Integrated on-line two-dimensional method and device for synchroned analytical temperature rising elution fractionation and gel permeation chromatography. Chevron Phillips Chemical Company, Conley Rose P C, Rodney B Carroll, Cheryl L Huseman, May 13, 2014: US08722416

An analytical method comprising performing a first fractionation of a polymer sample based on differences in crystallizability to provide a first set of sample fractions, performing a first analysis on the first set of sample fractions, performing a second fractionation of the first set of sample fr ...


10
Chung C Tso, Robert L Wynn: Benzylic oxidation and catalyst therefor. Phillips Petroleum Company, Lucas K Shay, February 2, 1993: US05183931

Oxidation of alkylaromatics having a benzylic hydrogen atom is catalyzed by a catalyst comprising a palladium salt, a metal persulfate, a third metal salt, and a tin salt in a carboxylic acid for a period of time sufficient to convert the alkylaromatics to their corresponding oxidized derivatives. T ...