General Electric Company

Donald R Berdahl

Susan Adams Nye

Pamela A Matsch

Gary William Yeager

James Anthony Cella

Edward Norman Peters

Joseph James Salvo

Sandra F Feldman

John Yupeng Gui

Emily Yixie Shu

Gary Keith Shank

Dana C Bookbinder

A sensitive chemiluminescence immunoassay method for field detection of the presence or the amount of low chlorinated biphenyl compounds in a solution is disclosed. The assay has a five minute analysis time and a working range of detection as low as about 1 part per billion chlorinated biphenyl. Kits for the detection of chlorinated biphenyls are disclosed.

Chemiluminescence immunoassay for chlorinated aromatic compound detection

Polyetherimide resins which crystallize from the melt contain crystallizing repeating units based on biphenoldianhydride or hydroquinone dianhydride and a linear aromatic diamine. The melt crystalline polyetherimides exhibit improved solvent resistance. The melt crystalline polymers retain the advantageous properties associated with their known amorphous polyetherimide counterparts.

Melt crystalline polyetherimides

A method is provided for preparing oxybisphthalimides by heating a nitrophthalimide compound in the presence of an alkali metal carboxylate, a phase transfer catalyst and a nonpolar organic solvent.

Method for preparing oxybisphthalimides

Polyetherimide precursor compositions are prepared by a reacting mixture of at least two diamines selected from the group consisting of o-phenylenediamine, m-phenylenediamine and 4-aminophenyl ether with the esterification product of a low molecular weight alkanol such as methanol and an ether tetracarboxylic acid dianhydride, preferably 3,4-dicarboxyphenyl ether dianhydride. Said polyimide precursor compositions may be converted to polyimides useful in composite formation, by gently heating to remove excess alkanol and subsequently baking at temperatures in the range of about 275.degree.-375.degree. C.

Polyetherimides and precursors therefor from oxydiphtalic anhydride

Polyetherimides are prepared from at least two diamines selected from the group consisting of o-phenylenediamine, m-phenylenediamine and 4-aminophenyl ether and a dicarboxyphenyl ether anhydride, or the esterification product thereof with a low molecular weight alkanol such as methanol. 3,4-Dicarboxyphenyl ether dianhydride is preferred. Said polyimides are tough, flexible and stable at high temperatures.

High temperature stable polyetherimides from oxydiphthalic dianhydride

Oxydiphthalic anhydride is prepared by effecting contact between a substituted phthalic anhydride such as 4-nitro or 4-fluoro phthalic anhydride and a dialkylaminopyridine in the presence of a refluxing nonpolar organic solvent.

Method for making oxydiphthalic anhydride

The intercondensation of aryldiamine and a mixture of oxydiphthalic anhydride and aromatic bis(ether anhydride), such as 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]-propane dianhydride, have been found to provide tough flexible transparent copolymer having T.sub.g 's from about 217.degree. C. to 300.degree. C.

Polyetherimide copolymers, and method for making

A method is provided for making oxybisphthalimides by heating an N-organonitrophthalimide in the presence of an aprotic organic solvent in an alkali metal carboxylate.

Method for making oxybisphthalimides

Solvent resistant polyimides are provided having improved T.sub.g by effecting reaction between aromatic bis(anhydride), such as aromatic bis(etheranhydride), and benzofuran amine such as 2-(4-aminophenyl)-5-benzofuranamine.

Polyimides and method for making

UV stabilized polyphenylene ether polymers and blends thereof are provided by this invention. This is accomplished by bonding UV absorbers directly to the polyphenylene ether chain or by polymerizing monomers to which the UV absorbers are bound.

Poly(phenylene ether)-bound UV absorber

Polyphenylene ether resins can be stabilized against the adverse influence of ultraviolet light by incorporating into the resin an effective amount of a benzofuran UV absorber.

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Scotia, NY, United States of America

Donald R Berdahl