CYNTHIA MITCHELL
Nursing in Houston, TX

2009016, Jun 25, 2009

Dec 16, 2008

12/316760

David John Lohse - Bridgewater NJ, US
Cynthia A. Mitchell - Houston TX, US
Michael Sansone - North Brunswick NJ, US

C08L 9/00, C08L 23/06, B29C 47/00

525232, 525240, 2641761, 2643281, 26417211

Provided is a polymer composition having a linear, semi-crystalline thermoplastic matrix polymer and a second thermoplastic polymer. The second polymer is a substantially saturated hydrocarbon polymer including (i) a backbone chain and (ii) one or more substantially hydrocarbon sidechains connected to the backbone chain. The sidechains each have a number-average molecular weight of from 2,500 g/mol to 125,000 g/mol and an MWD by SEC of 1.0 to 3.5. The mass ratio of sidechain molecular mass to backbone molecular mass is from 0.01:1 to 100:1. The matrix polymer is present at 95 wt % or more based on the weight of the composition. The second polymer is present at 0.2 to 5.0 wt % or more based on the weight of the composition. Provided is also a method for enhancing flow-induced crystallization in a linear, semi-crystalline thermoplastic matrix polymer. Provided is also a method for processing a polymer composition.

7879940, Feb 1, 2011

Jun 21, 2004

10/561253

James M. Tour - Bellaire TX, US
Jared L. Hudson - Houston TX, US
Ramanan Krishnamoorti - Bellaire TX, US
Koray Yurekli - Cengelkoy, TR
Cynthia A. Mitchell - Houston TX, US

William Marsh Rice University - Houston TX

B60C 1/00, C08F 4/46

524495, 526173

The present invention is directed to aryl halide (such as aryl bromide) functionalized carbon nanotubes that can be utilized in anionic polymerization processes to form polymer-carbon nanotube materials with improved dispersion ability in polymer matrices. In this process the aryl halide is reacted with an alkyllithium species or is reacted with a metal to replace the aryl-bromine bond with an aryl-lithium or aryl-metal bond, respectively. It has further been discovered that other functionalized carbon nanotubes, after deprotonation with a deprotonation agent, can similarly be utilized in anionic polymerization processes to form polymer-carbon nanotube materials. Additionally or alternatively, a ring opening polymerization process can be performed. The resultant materials can be used by themselves due to their enhanced strength and reinforcement ability when compared to their unbound polymer analogs. Additionally, these materials can also be blended with pre-formed polymers to establish compatibility and enhanced dispersion of nanotubes in otherwise hard to disperse matrices resulting in significantly improved material properties.

2007025, Nov 8, 2007

Jun 23, 2004

10/561712

James Tour - Bellaire TX, US
Jared Hudson - McLean VA, US
Koray Yurekli - Istanbul, TR
Cynthia Mitchell - Houston TX, US

William Marsh Rice University - Houston TX
The University of Houston - Houston TX

C08K 7/06, C01B 31/02

523333000, 524847000, 977742000

The present invention is directed to carbon nanotube-elastomer composites, methods for making such carbon nanotube-elastomer composites, and articles of manufacture made with such carbon nanotube-elastomer composites. In general, such carbon nanotube-elastomer (CNT-elastomer) composites display an enhancement in their tensile modulus (over the native elastomer), but without a large concomitant reduction in their strain-at-break.

2010002, Feb 4, 2010

Aug 1, 2008

12/184681

Kevin B. Stavens - Houston TX, US
Cynthia A. Mitchell - Houston TX, US

C08F 2/01, B01J 19/24

526 60, 526 62, 422138

Methods and system for in-situ measurement of polymer growth within an olefin polymerization reactor are provided. The method includes polymerizing one or more olefins within a reactor at a first temperature sufficient to deposit a polymer coating therein. A second temperature is created within the reactor, and a rate of temperature change is measured from the first temperature to the second temperature. The rate of temperature change is correlated to a thickness of the polymer coating deposited within the reactor.

2012031, Dec 20, 2012

May 8, 2012

13/466182

Yu F. Wang - Houston TX, US
Cynthia A. Mitchell - Houston TX, US
Lisa B.V. Venditte - Houston TX, US
George Rodriguez - Houston TX, US
Sudhin Datta - Houston TX, US

B29C 47/76

264101, 4253021, 425 67

Methods and systems for pelletizing low molecular weight semi-crystalline polymers are provided herein. Polymer compositions comprising the semi-crystalline polymer and a solvent are provided to a devolatilizing device, where the solvent is at least partially evaporated under vacuum conditions, resulting in removal of heat from the polymer by evaporative cooling and crystallization of the polymer. Once the polymer has reached the desired temperature, the polymer exits the devolatilizer and is pelletized. Semi-crystalline polymers that may be used in the present invention include propylene-based copolymers, such as propylene-ethylene and propylene-hexene copolymers having a heat of fusion, Hf, from about 5 to about 75 J/g and a weight average molecular weight, Mw, from about 10,000 to about 200,000 g/mol.

8455583, Jun 4, 2013

Aug 2, 2005

11/659407

Ramanan Krishnamoorti - Bellaire TX, US
Cynthia A. Mitchell - Houston TX, US
Jeffrey L. Bahr - Houston TX, US

University of Houston - Houston TX

C08K 3/04

524496, 524495, 977742, 977745, 977746, 977748, 977753

The present invention is directed to carbon nanotube (CNT)/polymer composites, i. e. , nanocomposites, wherein the CNTs in such nanocomposites are highly dispersed in a polymer matrix, and wherein the nanocomposites comprise a compatibilizing surfactant that interacts with both the CNTs and the polymer matrix. The present invention is also directed to methods of making these nanocomposites. In some such methods, the compatibilizing surfactant provides initial CNT dispersion and subsequent mixing with a polymer. The present invention is also directed to methods of using these nanocomposites in a variety of applications.

2013022, Aug 29, 2013

Oct 12, 2011

13/819825

Mun Fu Tse - Seabrook TX, US
Cynthia A. Mitchell - Houston TX, US
Sudhin Datta - Houston TX, US

Exxon Mobil Chemical Patents Inc. - Baytown TX

C09J 123/14

524505, 524528

The present invention is related to adhesive compositions and their applications. In particular, the adhesive compositions described herein comprise a two or more propylene-based copolymers with varying comonomer content.