E.i. Dupont De Nemours and Company

The University of North Carolina at Chapel Hill

Anju Parthasarathy

Jerald Feldman

Lynda Kaye Johnson

Edward Bryan Coughlin

Steven Dale Ittel

Kristina Ann Kreutzer

Stephan James McLain

Alison Margaret Bennett

Samuel David Arthur

Maurice S Brookhart

Christopher Moore Killian

Lin Wang

Alison Margaret Anne Bennett

Daniel Joseph Tempel

Wilson Tam

Elizabeth Forrester McCord

Yueli Wang

Dennis S Donald

Elisabeth Muriel Hauptman

Xing Shen

Lissa Taka Nelson

Robert D Simpson

Zhen-Yu Yang

This invention concerns a method for increasing the polymerization rate of polyester polymers in the solid state by adding a catalytic amount of zinc p-toluenesulfonate to a polyester polymer melt that is essentially free of antimony and germanium, before solid state polymerization.

Method for increasing solid state polymerization rate of polyester polymers

Selected olefins such as ethylene and &agr;-olefins are polymerized by nickel &lsqb;II&rsqb; complexes of certain monoanionic ligands. The polyolefins are useful in many applications such as molding resins, film, fibers and others. Also described are many novel nickel compounds and their precursors, as well a novel ligands.

Polymerization of olefins

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 &agr;-olefins by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected &agr;-diimine ligand and a selected Lewis or Bronsted acid, or by contacting selected &agr;-diimine nickel complexes with ethylene.

&agr;-olefins and olefin polymers and processes therefor

The present invention concerns compounds of Formula I R,Si&lsqb;(Q),A(CH,),H&rsqb;,or of Formula II &lsqb;H(CH,),A(Q),&rsqb;,SiR,SiR,&lsqb;(Q),A(CH,),H&rsqb;,, wherein Q is OCH,CH,, OCH,CHCH,, or any combination of one or more units of OCH,CH,and OCH,CHCH,; A is O, OC,H,, S, NH, NR, O&mdash;C(O)&mdash;; R is alkyl, aryl, or alkaryl; x is greater than 2 and less than 100;y is greater than 0; except when A&boxH;OC,H,, then y is greater than or equal to 0; z is 1 to 4; and each R,is independently selected from the group consisting of alkyl, aryl and alkaryl; B is O, C,H,, &mdash;(CH,),&mdash;, and hydrocarbylene; q is greater than 1 and less than 30; b is 1 to 3; and each R,is independently selected from the group consisting of alkyl, aryl, and alkaryl, used as nonvolatile in situ precursors to anti-fog agents for packaging films and a novel process of making such films.

Reduced volatility precursors to anti-fog agents

Disclosed herein is a process for the polymerization of ethylene, norbornenes and styrenes, by contacting in solution a selected nickel compound and a selected compound which is or can coordinated to the nickel with the olefin(s). The polymers produced are useful for films and molding resins.

Olefin polymerization process

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 .alpha.-olefins by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected .alpha.-diimine ligand and a selected Lewis or Bronsted acid, or by contacting selected .alpha.-diimine nickel complexes with ethylene.

.alpha.-olefins and olefin polymers and processes therefor

.alpha.-diimines for polymerization catalysts

Processes of polymerizing olefins

Growing community of inventors

Glenmoore, PA, United States of America

Anju Parthasarathy