General Electric Company

Sabic Innovative Plastics IP B.v.

Sabic Global Technologies B.v.

Narayan Ramesh

Patrick Joseph McCloskey

Paul Michael Smigelski, Jr

Roy Ray Odle

Kathryn Lynn Longley

Lioba Maria Kloppenburg

James Anthony Cella

Eric James Pressman

Marc Brian Wisnudel

Chellappa Balan

Jan Henk Kamps

Norberto Silvi

Mark Howard Giammattei

Michael John Bowman

Jan Pleun Lens

Paul Russell Wilson

Warren William Reilly

Andrei Colibaba-Evulet

Beatriz Penalver Bernabe

Vijay Gopalakrishnan

Harpreet Singh

Matt Kuhlman

James Alfred Day

David Bruce Hall

Albert Santo Stella

Alberto Nisoli

Matthew L Kuhlman

Shailesh Singh Bhaisora

Sauri Gudlavalleti

James D Day

Bernabe Beatriz Penalver

The present invention provides a process for measuring and controlling chemical reactions that produce thermoplastic polymers by utilizing a stoichiometry correction during a reaction cycle to produce thermoplastic resins with desired properties. The thermoplastic polymer is made from at least one first monomer having a first reactive end group and at least one second monomer having a second reactive end group by reaction of the first reactive end group with the second reactive end group and has a glass transition temperature of greater than 130&#xb0; C.

Process for controlling reaction stoichiometry during polymerization of thermoplastic resins

A method for purifying an oxydiphthalic anhydride comprises diluting a first mixture comprising an oxydiphthalic anhydride, a solvent, a catalyst, and an inorganic salt with a solvent, to provide a second mixture having a solids content of 10 to 30 percent based on total weight of the second mixture; filtering and washing the solids of the second mixture at a temperature below the crystallization point temperature of the oxydiphthalic anhydride to provide a third mixture; hydrolyzing the third mixture by adding water and a water-soluble acid to form a fourth mixture; heating the fourth mixture; then cooling to provide a solid-liquid mixture, optionally decanting a portion of the liquid, rediluting the remaining solid-liquid mixture, then filtering to provide a solid component; washing the solid component with water to provide a fifth mixture of oxydiphthalic tetraacid and water; ring closing the oxydiphthalic tetraacid to provide oxydiphthalic anhydride, and filtering the oxydiphthalic anhydride.

Method of purifying dianhydrides, the dianhydrides formed thereby, and polyetherimides formed therefrom

A method for preparing an oxydiphthalic anhydride comprises contacting, under reactive and substantially anhydrous conditions in a reactor, at least one halophthalic anhydride containing more than 250 ppm chlorophthalide impurity with a carbonate of the formula MCO, wherein M is an alkali metal, in the presence of a catalytic proportion of at least one phase transfer catalyst selected from the group consisting of hexaalkylguanidinium halides and alpha,omega-bis(pentaalkylguanidinium)alkane salts, phosphonium salts, phosphazenium salts, pyridinium salts, phosphazenium salts, ammonium salts, and combinations thereof. The phase transfer catalyst is present in a sufficient amount to prepare the oxydiphthalic anhydride when the chlorophthalide is present in an amount that is more than 250 ppm, and the oxydiphthalic anhydride is produced in a yield, based on the carbonate, of at least 70%.

Methods for preparing oxydiphthalic anhydrides, oxydiphthalic anhydrides prepared thereby, and polyetherimides derived therefrom

Disclosed herein is a method comprising combusting a feed stream to form combustion products; and reforming the combustion products to produce a gaseous composition comprising hydrogen. Disclosed herein too is a method for producing hydrogen comprising introducing a feed stream comprising natural gas and air or oxygen into a cyclical compression chamber; compressing the feed stream in the cyclical compression chamber; combusting the feed stream in the cyclical compression chamber to produce combustion products; discharging the combustion products from the cyclical compression chamber into a reforming section; and reforming the combustion products with steam in the reforming section to produce a gaseous composition comprising hydrogen.

Method and article for producing hydrogen gas

This invention relates to an extrusion method preparing polycarbonates from a solution of an oligomeric polycarbonate. A mixture of bis(methyl salicyl)carbonate (BMSC), BPA and a transesterification catalyst are first equilibrated at moderate temperatures to provide a solution of polycarbonate oligomer in methyl salicylate. The solution is then fed to a devolatilizing extruder, where the polymerization reaction is completed and the methyl salicylate solvent is removed. The solution comprising the oligomeric polycarbonate can also be pre-heated under pressure to a temperature above the boiling point of methyl salicylate and subsequently fed to a devolatilizing extruder equipped for rapid flashing off the solvent. The method provides polycarbonate with greater efficiency than the corresponding process in which unreacted monomers are fed to the extruder. Additionally, the method of the invention does not require the isolation of a precursor polycarbonate comprising ester-substituted phenoxy terminal groups.

Method for making an aromatic polycarbonate

A hydrogen reforming system includes a cyclical compression chamber having an entry port for receiving hydrogen-containing gas and an exit port for delivering reformed hydrogen-containing gas, an arrangement for heating the hydrogen-containing gas to a non-combustible temperature, and a drive system for cycling the cyclical compression chamber. The cyclical compression chamber has an operational cycle with an internal pressure and temperature absent combustion effective for reforming the hydrogen-containing gas.

Method and system for producing hydrogen by reforming hydrogen-containing gas

Polycarbonates containing low or undetectable levels of Fries rearrangement products and comprising repeat units derived from one or more of resorcinol, hydroquinone, methylhydroquinone, bisphenol A, and 4,4'-biphenol have been prepared by the melt reaction of one or more of the aforementioned dihydroxy aromatic compounds with an ester-substituted diaryl carbonate such as bis-methyl salicyl carbonate. Low, or in many instances undetectable, levels of Fries rearrangement products are found in the product polycarbonates obtained as the combined result of a highly effective catalyst system which suppresses the Fries reaction and the use of lower melt polymerization temperatures relative to temperatures required for the analogous polymerization reactions using diphenyl carbonate.

Method of polycarbonate preparation

Stable, homogeneous melt solutions are prepared at temperatures of 200&#xb0; C. or less from solid mixtures comprising at least one diaryl carbonate, at least one high melting dihydroxy aromatic compound (mp&#x3e;200&#xb0; C.), a transesterification catalyst, and optionally a lower melting dihydroxy aromatic compound. Thus, a stable, homogeneous melt solution is obtained from a solid mixture comprising 4,4'-biphenol (mp 282-284&#xb0; C.) at a temperature of about 200&#xb0; C. using either diphenyl carbonate or bis(methyl salicyl) carbonate as the diaryl carbonate component. It is shown that formation of the stable, homogeneous melt solutions requires the presence of the transesterification catalyst when substantial amounts of the high melting dihydroxy aromatic compound are present in the initial solid mixture. Solid mixtures comprising a variety of high melting bisphenols; 4,4&#x2032;-biphenol; 3,3,3,3&#x2032;-tetramethylspirobiindanbisphenol, and 4,4&#x2032;-sulfonyidiphenol are converted to stable, homogeneous melt solutions at 200&#xb0; C., a temperature substantially below the melting points of the high melting bisphenols in their pure states.

Method for making stable, homogeneous melt solutions

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Evansville, IN, United States of America

Narayan Ramesh