E.i. Dupont De Nemours and Company

E. I. Du Pont De Nemours + Company

David T Williamson

Wilson Tam

Kenneth Gene Moloy

Richard Douglas Bauer

Kalindi Dogra

Henry Max Schleinitz

Thomas M Herrod

William M Simmons

Max Henry Schleinitz

Compositions of thermoplastic polyesters containing dispersed nanoparticles of fibrous clay are made by polymerizing the polyester precursors in the presence of exfoliated fibrous clay that has not been organically modified. The compositions have good physical properties and can be melt molded into various articles. Many of these articles may be coated (painted) and are especially useful for appearance parts such as visible exterior automotive body parts.

Compositions of polyesters and fibrous clays

This invention relates to the preparation of polyamide block copolymers by sequential monomer addition. More particularly, it relates to catalysts capable of copolymerizing not only cyclic amides, but other monomers such as cyclic esters and epoxides as well, using sequential addition so as to produce useful and novel block copolymers.

Preparation of polyamide block copolymers

Linear block copolymers that have at least one hydrophilic block and at least one hydrophobic block, wherein the hydrophilic block of the copolymer has at least one carboxylic acid functionality (or salt thereof) that can readily decarboxylate. These copolymers are useful as binders and/or dispersants in inkjet inks.

Decarboxylating block copolymers

The invention is directed to nanocomposite compositions that contain at least one thermoplastic polyamide and unmodified sepiolite-type clay nanoparticles. It, also, includes articles containing such compositions.

Nanocomposite compositions of polyamides and sepiolite-type clays

Mixtures or adducts of N-heterocyclic carbenes with metal amides or metal alkoxides are effective catalysts for the polymerization of cyclic amides. The catalysts are stable at polymerization temperatures, and the polymerization is rapid, resulting in high monomer conversion, high molecular weight, and a mechanically sound material.

Polymerization of cyclic amides using N-heterocyclic carbene and metal amide and metal alkoxide catalysts

N-heterocyclic carbenes are effective catalysts for the polymerization of macrocyclic polyester oligomers. The catalysts provide rapid polymerization, high monomer conversion, high molecular weight, and a mechanically sound material.

Polymerization of macrocyclic polyester oligomers using N-heterocyclic carbene catalysts

Compounds containing a lanthanide rare earth element or yttrium are effective catalysts for the polymerization of macrocyclic polyester oligomers. The catalysts are stable at elevated temperatures, and the polymerization is rapid, resulting in high monomer conversion, high molecular weight, and a mechanically sound material.

Polymerization of macrocyclic polyester oligomers at elevated temperature using rare earth element catalysts

Metal amide and metal alkoxide species have been found to catalyze the ring opening polymerization of macrocyclic polyester oligomers. The catalysts provide rapid polymerization, high monomer conversion, high molecular weight, and a mechanically sound material.

Polymerization of macrocyclic polyester oligomers using metal amide and metal alkoxide catalysts

N-heterocyclic carbenes are effective catalysts for the ring opening polymerization of cyclic amides. The catalysts provide rapid polymerization, high monomer conversion, high molecular weight, and a mechanically sound material.

Ring opening polymerization of cyclic amides using N-heterocyclic carbene catalysts

This invention concerns a process for the preparation of semicrystalline polycarbonate compositions by synthesizing the polycarbonate in the presence of a sepiolite-type clay as a nucleating agent. The semicrystalline compositions produced are useful as starting materials for the production of high molecular weight polycarbonate by solid state polymerization.

Rapidly crystallizing polycarbonate composition

Mixtures or adducts of N-heterocyclic carbenes with metal amides or metal alkoxides are effective catalysts for the polymerization of macrocyclic polyester oligomers. The catalysts are stable at polymerization temperatures, and the polymerization is rapid, resulting in high monomer conversion, high molecular weight, and a mechanically sound material.

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Hockessin, DE, United States of America

David T Williamson