William Marsh Rice University

Univation Technologies, LLC

Exxonmobil Chemical Patents Inc.

Exxonmobil Technology and Engineering Company

Haiqing Peng

Valery Khabashesku

Mary Lou Margrave, Legal Representative

John L Margrave

C Jeff Harlan

Donna Jean Crowther

Wilbur Edward Billups

Jackie Lovell

Yunming Ying

Bruce Jon Savatsky

Robert H Hauge

James McLeod Farley

Wesley R Mariott

Enrique V Barrera

Matteo Pasquali

Brandon C Locklear

Jiang Zhu

Richard E Smalley

Roger L Kuhlman

John Francis Szul

Timothy R Lynn

Ching-Tai Lue

Robert Olds Hagerty

Michael E Muhle

Daniel Paul Zilker, Jr

Howard K Schmidt

Daniel D VanderLende

Lee Jeremy Hall

Antonios K Doufas

Fathi David Hussein

Michael D Awe

Abdelhadi Sahnoune

Henri Aime Lammens

Dragan Stojkovic

Daniel D Vanderlende

Daniel P Zilker

Donald Andrew Winesett

Irene Morin Marek, Legal Representative

Ya-Qiong Xu

Kendal K Decker

A Nicholas Parra-Vasquez

Arthur G Voepel

Timothy S McCracken

Pradeep K Rai

Manuel Joao Mendes

Jeff C Harlan

Donna J Crowther

Valery N Khabashesku

Mary Lou Lf Margrave

JohnL Margrave

Jr Zilker Daniel P

Enrique Barrera

Proppant particulates like sand are commonly used in hydraulic fracturing operations to maintain one or more fractures in an opened state following the release of hydraulic pressure. Fracturing fluids and methods of hydraulic fracturing may also use proppant particulates composed of high-flow polyolefin coated mineral particles (referred to as high-flow polyolefin coated mineral proppant particulates). In some instances, the high-flow polyolefin-coated mineral proppant particulates have a particle density of equal to or less than about 1.35 grams per cubic centimeter, and further may be prepared using a one-pot hot melt process.

High-flow polyolefin coated mineral as proppant particulate material and methods related thereto

The present disclosure provides processes for producing polyethylene resins. In at least one embodiment, a polyethylene has: a density of from about 0.91 g/cmto about 0.94 g/cm; a value of Mz of about 1,500,000 g/mol or greater; and a ratio of Mz to Mw of about 7 or greater. A process includes introducing a first feed stream having ethylene monomer and a first free radical initiator to a first inlet of a first reaction zone, where the first reaction zone has a first inlet temperature. The process further includes introducing a second feed stream having ethylene monomer and a second free radical initiator to a second inlet of a second reaction zone, where the second reaction zone has a second inlet temperature that is the same or different than the first inlet temperature.

Polyethylenes and processes for producing polyethylenes

Catalyst systems and methods for making and using the same are disclosed. A catalyst composition is provided that includes a catalyst compound supported to form a supported catalyst system, the catalyst compound including: where each of R, R, R, R, R, R, Rand X are as discussed herein.

Catalysts for control of long chain branching

Embodiments of the present disclosure are directed towards catalyst formulations including a metallocene and a stearic compound selected from bis 2-hydroxyethyl stearyl amine, aluminum distearate, and combinations thereof, where the metallocene is represented by the following formula: (Formula (I)) wherein each n-PR is n-propyl, and each X is independently CH, Cl, or F. 

Catalyst formulations

Provided herein are polyethylene compositions suitable in the fabrication of PE-RT pipes for use in cold and hot water plumbing in accordance with ISO 22391-2, and processes for making the same.

PE-RT pipes and processes for making the same

Methods for reducing gels and/or dome sheeting in gas phase polymerization processes and their resulting products are provided. The polymerization processes include polymerizing ethylene and one or more optional comonomers in a fluidized bed reactor in the presence of a metallocene catalyst, hydrogen, and at least one condensing agent.

Methods for making polyethylene polymers

A method of polymerizing olefins is disclosed. The method comprises contacting ethylene and at least one comonomer with a catalyst system to produce a polyolefin polymer that is multimodal. The catalyst system comprises a first catalyst that promotes polymerization of the ethylene into a low molecular weight (LMW) portion of the polyolefin polymer and a second catalyst that promotes polymerization of the ethylene into a high molecular weight (HMW) portion of the polyolefin polymer. The first catalyst and at least a portion of the second catalyst are co-supported to form a commonly-supported catalyst system and at least a portion of the second catalyst is added as a catalyst trim feed to the catalyst system.

Producing polyolefin products

We have discovered that size dependent solubility of large fullerenes in strong acids is dependent on acid strength. This provides a scalable method for separating large fullerenes by size. According to some embodiments, a method for processing a fullerene starting material comprises large fullerenes comprises mixing the starting material with a first concentrated sulfuric acid solution so as to obtain a first dispersion comprising a first portion of the large fullerenes solubilized in the first concentrated sulfuric acid solution.

Methods for solubilizing and separating large fullerenes

The present invention is directed to methods of integrating carbon nanotubes into epoxy polymer composites via chemical functionalization of carbon nanotubes, and to the carbon nanotube-epoxy polymer composites produced by such methods. Integration is enhanced through improved dispersion and/or covalent bonding with the epoxy matrix during the curing process. In general, such methods involve the attachment of chemical moieties (i.e., functional groups) to the sidewall and/or end-cap of carbon nanotubes such that the chemical moieties react with either the epoxy precursor(s) or the curing agent(s) (or both) during the curing process. Additionally, in some embodiments, these or additional chemical moieties can function to facilitate dispersion of the carbon nanotubes by decreasing the van der Waals attractive forces between the nanotubes.

Fiber-reinforced polymer composites containing functionalized carbon nanotubes

According to some embodiments, a method for separating a first fraction of a single wall carbon nanotubes and a second fraction of single wall carbon nanotubes includes, but is not limited to: flowing a solution comprising the nanotubes into a dielectrophoresis chamber; applying a DC voltage, in combination with an AC voltage, to the dielectrophoresis chamber; and collecting a first eluent from the dielectrophoresis chamber, wherein the first eluent comprises the first fraction and is depleted of the second fraction, wherein the first and second fractions differ by at least one of conductivity, diameter, length, and combinations thereof.

Flow dielectrophoretic separation of single wall carbon nanotubes

The present invention is directed toward compositions comprising carbon nanotubes (CNTs) that are sidewall-functionalized with amino acid groups, and to amino acid compositions comprising carbon nanotubes. The present invention is also directed to simple and relatively inexpensive methods for the preparation of such compositions. Such compositions are expected to greatly extend the bio-medical applications of CNTs.

Nanotube-amino acids and methods for preparing same

A method for functionalizing the wall of single-wall or multi-wall carbon nanotubes involves the use of acyl peroxides to generate carbon-centered free radicals. The method allows for the chemical attachment of a variety of functional groups to the wall or end cap of carbon nanotubes through covalent carbon bonds without destroying the wall or endcap structure of the nanotube. Carbon-centered radicals generated from acyl peroxides can have terminal functional groups that provide sites for further reaction with other compounds. Organic groups with terminal carboxylic acid functionality can be converted to an acyl chloride and further reacted with an amine to form an amide or with a diamine to form an amide with terminal amine. The reactive functional groups attached to the nanotubes provide improved solvent dispersibility and provide reaction sites for monomers for incorporation in polymer structures. The nanotubes can also be functionalized by generating free radicals from organic sulfoxides.

Method for functionalizating carbon naontubes utilizing peroxides

Method for functionalizing carbon nanotubes utilizing peroxides

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Sugar Land, TX, United States of America

Haiqing Peng