E.i. Dupont De Nemours and Company

Forty Ten L.l.c.

Edward G Brugel

Robert DiCosimo

Wilson Tam

Anna Panova

Robert Di Cosimo

Royce Elton Ennis

Frank P Gay

Israel A David

Walter Yllo

Jerry W Soape

Thomas G Priest

Richard P Chmiel

Richard L Iazzetti

Christopher J Bish

Hydrolytic enzymes capable of catalyzing amidation reactions can be used to produce cyclic amide oligomers from diesters and diamines. The cyclic amide oligomers are useful for the production of higher molecular weight polyamides.

Enzymatic production of macrocyclic amide oligomers

A continuous process for the process for the enzyme-catalyzed preparation of cyclic ester oligomers from linear ester oligomers. The process may use a linear or recirculating reactor.

Continuous bioreactor process for the preparation of polyester cyclic oligomers

Enzymes which are capable of catalyzing esterifications and/or transesterifications such as selected lipases and esterases can, under specified conditions, convert certain lower linear oligomers of polyesters to their cyclic ester oligomers in quantities greater than would be predicted by thermodynamic calculation or prior art methods. The cyclic ester oligomers are useful for the production of higher molecular weight linear polyesters.

manufacture of certain cyclic ester oligomers

Chemically different cyclic ester oligomers can be copolymerized to form copolyesters whose properties can be tailored by the choice of cyclic ester oligomers used. The copolyesters formed are especially useful as encapsulants and as coatings. In many instances the copolyesters, assuming they are not randomized in later transesterification reactions, have unique microstructures related to the sequencing of repeat units the their polymer chains.

Copolymerization of cyclic ester oligomers

Cyclic ester oligomers (CEOs) are manufactured from linear polyesters or their precursors by a continuous reactive extraction in which the linear polyesters are converted to the CEOs and the CEOs selectively removed from the mixture by extraction with a fluid. The fluid may be a liquid or a gas. The CEOs prodcued are useful as monomers, for example in a reaction injection molding process to rapidly form polyesters from low viscosity liquids.

Manufacture of cyclic ester oligomers

A soluble mono-alkyl Stannoic Acid/glycol liquid phase catalyst produced from the reaction of a mono-alkyl Stannoic Acid and a glycol at a temperature of from at least 180.degree. C., and its use in preparing high molecular weight polyester polymers.

Soluble mono-alkyl stannoic acid catalyst and its use in preparing high

A coating material for coating a substratehas been invented, the coating material including solvent, chlorosulfonated polyethylene dissolved in the solvent, hardener, and strengthener material. A process for producing a coating material for coating a substrate has been invented, the process including reacting chlorosulfonated polyethylene with an amino silane producing reaction product by the cross-linking of the chlorosulfonated polyethylene with the amino silane, adding carbon black to the reaction product, adding kaolin clay to the reaction product, and dissolving the reaction product, carbon black, and kaolin clay in a solvent forming a solution, the solution applyable to a substrate to form a coating thereon upon evaporation of the solvent.

Coatings for concrete containment structures

An improved process for preparing high molecular weight polyester polymers, such as poly(butylene terephthalate), an alkylene glycol and a di- or tricarboxylic acid by first preparing a pre-polymer in the form of uniform solid particles having an intrinsic viscosity of from 0.1 to about 0.3 dL/gm and a chemical composition which contains greater than a 1% stoichiometric excess of the alkylene glycol above the amount required to produce a high molecular weight polymer, and polymerizing the pre-polymer in the solid state.

Process for preparing high molecular weight polyesters

Sulfonate salts produced by basic hydrolysis of chlorosulfonated ethylene/propylene polymers grafted with an unsaturated acid or anhydride having chlorine contents of 20-70 weight percent and sulfur contents of 1.5-10 weight percent, and 2-10 weight percent copolymerized ethylene units provide self-stabilized resin latexes of unusual stability.

Stable chlorosulfonated resin latex related applications

Self-stabilized resin latexes are provided which contain sulfonate salts produced by basic hydrolysis of chlorosulfonated C.sub.2 -C.sub.8 alpha-olefin polymers grafted with an unsaturated acid or anhydride, the polymers having chlorine contents of 20-70 weight percent and sulfur contents of 1.5-10 weight percent.

Stable chlorosulfonated resin latex

Non-discolored chlorinated and chlorosulfonated olefin polymers having low levels of residual solvent are prepared in a process wherein monofluorobenzene is used as a reaction medium and isolation of the polymer is by means of a series of vented closed loop extruders. The process also results in suppression of the formation of monochloromonofluorobenzene as a by-product.

Process for preparation of chlorinated and chlorosulfonated olefin

Curable multilayer coated plastic substrates are provided having enhanced gasoline resistance and topcoat adhesion. The plastic is coated with a primer layer which is either a chlorosulfonated grafted polypropylene polymer or a mixture of a chlorinated grafted propylene polymer and a chlorosulfonated olefin polymer and which is free of crosslinking agents for the chlorosulfonated polymer. The primer layer is coated with a coating layer having free hydroxyl, primary amino, or secondary amino groups capable of reacting with the chlorosulfonyl groups of the primer layer.

Gasoline resistant coated multilayer plastic substrate

Low molecular weight olefin resins are blended with small amounts of high molecular weight olefin resins and the blends are chlorinated or chlorosulfonated. Melt and film strengths of the resultant low molecular weight chlorinated and chlorosulfonated resins are thereby increased sufficiently to enable recovery by means of methods which require film or strand formation. The chemical properties and solution characteristics of the blends are substantially maintained compared to those of the low molecular weight chlorinated resins themselves.

Process for isolation of low molecular weight chlorinated and

Olefin polymers of melt index 1-500 g/10 minutes are chlorinated or chlorosulfonated in perfluorinated alkane, perfluorinated ether, or perfluorinated tertiary amine suspension.

Growing community of inventors

Wilmington, DE, United States of America

Edward G Brugel