1
Vivek Rohatgi, Jeffrey F Greco, Yongwoo Inn, Qing Yang, Alfred E Brown Jr: Polymers with improved ESCR for blow molding applications. Chevron Phillips Chemical Company, Merchant & Gould P C, October 27, 2015: US09169337 (9 worldwide citation)

Disclosed herein are ethylene-based polymers having a higher molecular weight component and a lower molecular weight component, and characterized by a density greater than 0.945 g/cm3, a melt index less than 1.5 g/10 min, and a ratio of high load melt index to melt index ranging from 40 to 175. Thes ...


2
Bruce E Kreischer, Paul J DesLauriers, Ronald D Knudsen, Vivek Rohatgi, Mark E Lashier, R Kim Perry, Chung Ching Tso: Oligomerization processes and polymer compositions produced therefrom. Chevron Phillips Chemical Company, Merchant & Gould P C, November 3, 2015: US09175109 (3 worldwide citation)

Disclosed herein are methods for recovering a by-product stream of an ethylene oligomerization process, and systematically processing this stream in order to form a polymer composition that can be pelletized conventionally. This polymer composition can have a bimodal molecular weight distribution, w ...


3
Lili Cui, Ashish M Sukhadia, Vivek Rohatgi: Peroxide treated metallocene-based polyolefins with improved melt strength. Chevron Phillips Chemical Company, Merchant & Gould P C, May 24, 2016: US09346897 (3 worldwide citation)

Disclosed herein are ethylene-based polymers having low densities and narrow molecular weight distributions, but high melt strengths for blown film processing. Such polymers can be produced by peroxide-treating a metallocene-catalyzed resin.


4
Vivek Rohatgi, Jeffrey F Greco, Yongwoo Inn, Qing Yang, Alfred E Brown Jr: Polymers with improved ESCR for blow molding applications. Chevron Phillips Chemical Company, Merchant & Gould PC, October 25, 2016: US09475898 (2 worldwide citation)

Disclosed herein are ethylene-based polymers having a higher molecular weight component and a lower molecular weight component, and characterized by a density greater than 0.945 g/cm3, a melt index less than 1.5 g/10 min, and a ratio of high load melt index to melt index ranging from 40 to 175. Thes ...


5
Ladislav Bednarik, Vivek Rohatgi, David V Reed: Enhanced adhesion of polyethylene terephthalate to paperboard. International Paper Company, Thomas W Barnes III, Matthew M Eslami, Kenneth R Schaefer, September 18, 2007: US07270876 (2 worldwide citation)

A unique primer emulsion chemistry yields excellent adhesion of polyethylene terephthalate (PET)resin to clay coated paperboard (with high starch content)at reduced coatweights of the primer emulsion and the resin as compared to other primer and tie-resin chemistries currently employed for moisture ...


6
Jeff F Greco, Qing Yang, Vivek Rohatgi, Mark L Hlavinka, Jim B Askew: Polymers with improved ESCR for blow molding applications. Chevron Phillips Chemical Company, Merchant & Gould P C, November 15, 2016: US09493589 (1 worldwide citation)

Disclosed herein are ethylene-based polymers generally characterized by a density greater than 0.954 g/cm3, high load melt index ranging from 10 to 45 g/10 min, a ratio of high load melt index to melt index ranging from 175 to 600, a rheological slope parameter ranging from 0.15 to 0.30, and an ESCR ...


7
Ladislav Bednarik, Vivek Rohatgi, David V Reed: Enhanced adhesion of polyethylene terephthalate to paperboard. International Paper Company, Thomas W Ryan III, March 24, 2009: US07507473 (1 worldwide citation)

A unique primer emulsion chemistry yields excellent adhesion of polyethylene terephthalate (PET)resin to clay coated paperboard (with high starch content) at reduced coatweights of the primer emulsion and the resin as compared to other primer and tie-resin chemistries currently employed for moisture ...


8
Jeff F Greco, Qing Yang, Vivek Rohatgi, Mark L Hlavinka, Jim B Askew: Methods for controlling die swell in dual catalyst olefin polymerization systems. Chevron Phillips Chemical Company, Merchant & Gould P C, May 16, 2017: US09650459

Methods for controlling the die swell of an olefin polymer produced using a dual catalyst system are disclosed. The die swell of the olefin polymer can be increased or decreased as a function of the catalyst weight ratio and the reactant molar ratio used during the olefin polymerization process.


9
Vivek Rohatgi, Yongwoo Inn, Ashish M Sukhadia, Qing Yang, Paul J DesLauriers: Polymers with improved processability for pipe applications. Chevron Phillips Chemical Company, Conley Rose P C, Rodney B Carroll, Chad E Walter, November 28, 2017: US09828451

A crosslinked metallocene-catalyzed polyethylene copolymer having a higher molecular weight (HMW) component and lower molecular weight (LMW) component wherein the HMW component is present in an amount of from about 10 wt. % to about 30 wt. % and wherein the LMW component is present in an amount of f ...


10
Vivek Rohatgi, Ashish M Sukhadia: System and method for blending polymers. Chevron Phillips Chemical Company, Fletcher Yoder P C, July 28, 2015: US09089831

The present techniques provide an extruder screw comprising a high shear melting and mixing zone starting a distance away from an entry point of the screw corresponding to 35%-50% of the overall screw L/D. The extruder screw may also include elements capable of increasing a degree of fill of the hig ...