Lynda Wall Johnson

US Patent:

6403738, Jun 11, 2002

Filed:

Jul 28, 1999

Appl. No.:

09/362432

Inventors:

Lynda Kaye Johnson - Wilmington DE
Lissa Taka Jennings Nelson - Highland Park IL

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 444

US Classification:

526161, 526172, 526352, 526115, 526116, 526117, 556 20, 556 51, 556 57, 556137, 556138, 502162, 502167, 502168

Abstract:

Various olefins may be polymerized using a catalyst systems containing selected -diimine, urethane or urea ligands, some of them novel, complexed to nickel, palladium or other selected transition metals. The polymers are useful as molding resins and elastomers.

US Patent:

6410660, Jun 25, 2002

Filed:

Mar 22, 1999

Appl. No.:

09/273410

Inventors:

Lynda Kaye Johnson - Wilmington DE
Joel David Citron - Wilmington DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 4642

US Classification:

526115, 526113, 526117, 526118, 526119, 526172, 525240, 502155

Abstract:

Mixtures of different polyolefins may be made by direct, preferably simultaneous, polymerization of one or more polymerizable olefins using two or more transition metal containing active polymerization catalyst systems, one of which contains nickel complexed to selected ligands. The polyolefin products may have polymers that vary in molecular weight, molecular weight distribution, crystallinity, or other factors, and are useful as molding resins and for films.

US Patent:

6458979, Oct 1, 2002

Filed:

Apr 24, 2000

Appl. No.:

09/556204

Inventors:

Lynda Kaye Johnson - Wilmington DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C07F 1500

US Classification:

556 34, 556 36, 556 37, 564272

Abstract:

Polyethylene is formed by contacting ethylene with a novel iron or cobalt complex of a selected 1,4,7-triaza-3-oxa-1,4,6-heptatriene or 2,5,8-triaza-1,8-nonadiene, optionally in the presence of a cocatalyst such as an alkylaluminum compound. The polymers formed as useful for molding and in films.

US Patent:

6482907, Nov 19, 2002

Filed:

Feb 1, 2000

Appl. No.:

09/496105

Inventors:

Lin Wang - Hockessin DE
Samuel David Arthur - Wilmington DE
Elizabeth Forrester McCord - Hockessin DE
Yueli Wang - Morisville NC
Peter Arnold Morken - Wilmington DE
Lynda Kaye Johnson - Wilmington DE

Assignee:

E.I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 470

US Classification:

526171, 526172, 526239, 526273, 526277, 526279, 526286, 526293, 5263078, 526316, 5263186, 526329, 526332, 526339, 526335, 526281, 526308

Abstract:

Olefins containing selected functional groups such as silyl, ether and alkenyl, and often containing a blocking group, may be copolymerized with unsubstituted olefins such as ethylene and propylene in the presence of certain coordination compounds of nickel or palladium. The resulting polymers are useful as molding resins, elastomers, in adhesives and for films.

US Patent:

6495646, Dec 17, 2002

Filed:

Feb 29, 2000

Appl. No.:

09/514880

Inventors:

Samuel David Arthur - Wilmington DE
Patricia Metzger Cotts - Greenville DE
Zhibin Guan - Hockessin DE
Lynda Kaye Johnson - Wilmington DE
Christopher Moore Killian - Gray TN
Elizabeth Forrester McCord - Hockessin DE
Stephan James McLain - Wilmington DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE
University of North Carolina at Chapel Hill - Chapel Hill NC

International Classification:

C08F 2002

US Classification:

5263171, 526319, 526352

Abstract:

Polyolefins with unique highly branched structures, and which have unusually low Mark-Houwink constants are described. They are useful for instance as elastomers, viscosity index modifiers and lubricating oil bases.

US Patent:

6506861, Jan 14, 2003

Filed:

May 31, 2001

Appl. No.:

09/871100

Inventors:

Lin Wang - Hockessin DE
Lynda Kaye Johnson - Wilmington DE
Alex Sergey Ionkin - Kennett Square PA

Assignee:

E. I. du Pont de Nmeours and Company - Wilmington DE

International Classification:

C08F 406

US Classification:

526172, 526170, 526171, 526161, 526164, 526169, 5261691

Abstract:

Olefins are polymerized by novel transition metal complexes of selected iminocarboxylate and iminoamido ligands, sometimes in the presence of cocatalysts such as alkylaluminum compounds or neutral Lewis acids. Olefins which may be (co)polymerized include ethylene, -olefins, and olefins containing polar groups such as olefinic esters for example acrylate esters. Also described are certain âZwitterionicâ transition metal complexes as polymerization catalysts for making polar copolymers. The resulting polymers are useful as thermoplastics and elastomers.

US Patent:

6541585, Apr 1, 2003

Filed:

May 31, 2001

Appl. No.:

09/870597

Inventors:

Lynda Kaye Johnson - Wilmington DE
Alison Margaret Anne Bennett - Wilmington DE
Kerwin D. Dobbs - Wilmington DE
Alex Sergey Ionkin - Kennett Square PA
Steven Dale Ittel - Wilmington DE
Ying Wang - West Chester PA
Catherine E. Radzewich - Wilmington DE
Lin Wang - Hockessin DE
Elisabeth Hauptman - Wilmington DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 444

US Classification:

526161, 526171, 526172, 526178, 526348, 526352, 502155, 502167

Abstract:

Polymers are produced using transition metal complexes that have sites capable of binding a Lewis acid in close proximity to the metal center.

US Patent:

6573353, Jun 3, 2003

Filed:

Sep 12, 2000

Appl. No.:

09/660578

Inventors:

Maurice S. Brookhart - Chapel Hill NC
Lynda Kaye Johnson - Wilmington DE
Christopher Moore Killian - Chapel Hill NC
Elizabeth Forrester McCord - Hockessin DE
Stephan James McLain - Wilmington DE
Daniel Joseph Tempel - Carrboro NC

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 1006

US Classification:

526351, 526161, 526172

Abstract:

Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalyzed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc. Also described herein is the synthesis of linear -olefins by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected -diimine ligand and a selected Lewis or Bronsted acid, or by contacting selected -diimine nickel complexes with ethylene.