General Electric Company

Andrew J Caruso

Julia L Lee

Gary Charles Davis

Tohru Takekoshi

Ramesh Hariharan

Marc Brian Wisnudel

Joseph A King, Jr

Joseph Richard Wetzel

Jane M Terry

Edwin J Iwanowicz

Sterling B Brown

James Alfred Day

Judith Stein

David Paul Mobley

Bhaskar Bhairavnath Idage

Erik W Walles

Mohan Mark Amaratunga

Choong Y Han

John Henry Lobos

Sukhendu Bikash Hait

Aliphatic tricarboxylic acids, as exemplified by 9-carboxy-1,18-octadecanedioic acid, may be prepared by the biotransformation of an olefinic monocarboxylic acid such as oleic acid to the corresponding olefinic dicarboxylic acid, preferably 1,18-octadec-9-enedioic acid, in the presence of a strain of yeast, such as a strain of , followed by the carboxylation of the olefinic dicarboxylic acid by reaction with carbon monoxide and water in the presence of a catalyst. The product tricarboxylic acids are useful as branching agents for polycarbonates.

Tricarboxylic acids, method, and branched polycarbonates prepared therefrom

Polycarbonates suitable for use in optical article

The invention relates to polycarbonates suitable for use in optical articles, and methods for making such polycarbonates. The polycarbonates may comprise residues of m,p-BPA and SBI.

Polycarbonates suitable for use in optical articles

The crystallinity of an amorphous precursor polycarbonate is enhanced by contact in the liquid or vapor state with a non-solvent which may be water, an alkanol or a mixture thereof and which is dialkyl carbonate-free. Contact temperatures are at least about 75.degree. C. and are further defined by the relationship

Method for enhancing crystallinity of polycarbonates

The invention relates to polycarbonates suitable for use in optical articles; the polycarbonates contain residues of alicyclic bisphenols and have properties particularly suited for use in high density optical data storage media. The polycarbonates further contain residues of other monomers, such as SBI and its derivatives; bisphenols, such as bisphenol A; CD-1 and its derivatives or some combination of each.

Polyimides, especially thermoset polyimides such as those prepared by the reaction of p-phenylenediamine with 4,4'-hexafluoroisopropylidenebis(phthalic anhydride) and nadic ester, are converted to monomers which may be recycled for polyimide synthesis by heating with a solution of an alkali metal hydroxide, such as lithium hydroxide or sodium hydroxide, in a dipolar aprotic solvent such as N-methylpyrrolidone. The products are the diamine and the tetracarboxylic acid alkali metal salt corresponding to the dianhydride.

Method for depolymerizing polyimides and recovering reagents therefrom

Organic values are salvaged from scrap polycarbonate by heating in the presence of an acid catalyst and a C.sub.1-4 alkyl phenol such as m- or p-cresol. Among the compounds which can be salvaged are polyalkylated xanthenes, phenol and diaryl carbonate.

Method for recovering phenol and xanthene values from waste polycarbonate

Polyalkylated xanthenes are prepared by effecting reaction between an alkylated phenol such as m-cresol and an oxygenated organic material such as acetone in the presence of an acid catalyst such as methanesulfonic acid.

Method for making polyalkylated xanthenes

Xanthene polyesters and polyamides are provided resulting from the reaction of alkylene, cycloaliphatic or aromatic diols or organo diamines with xanthene dicarboxylic esters or xanthene dicarboxylic acid halides. These amorphous, or crystalline film forming, high performance thermoplastics which are useful in automotive applications, and include copolymers and blends of such xanthene polymers.

Xanthene polymers, and copolymers, and method for making

A method is provided for converting a 2,4,6-trialkylphenol, such as mesitol, to a dialkylphenol, for example 2,6-dimethylphenol, by effecting the selective oxidation of the 2,4,6-trialkylphenol, followed by the deformylation of the resulting 3, 5-dialkyl-4-hydroxybenzaldehyde.

Method for making a 2,6-dialkylphenol

A method is provided for recovering phenol values from bisphenol A tar by treating the bisphenol A tar with an alkyl phenol, such as cresol in the presence of an acid catalyst. In addition to recovering phenol, there is obtained a variety of dialkyl 9,9-dimethylxanthenes which can be converted to dicarboxylic acids and their corresponding diesters which are useful polymer intermediates.

Method for recovering phenol and xanthene values from bisphenol A tars

Addition-curable platinum group metal catalyzed silicone compositions are provided which utilize a bis(trialkoxysilylalkyleneoxycarbonylalkylene)amine adhesion promoter, such as NH[CH.sub.2 CH.sub.2 C(O)OCH.sub.2 CH.sub.2 CH.sub.2 Si(OCH.sub.3).sub.3 ].sub.2. Cohesive bonding is effected on both plastic and metal substrates at temperatures of 100.degree. C. or less and in 1 hour or less.

Addition-curable silicone adhesive compositions, and

Compatible compositions comprising polyarylene sulfide-polyphenylene ether copolymers are prepared by the reaction of a polyphenylene ether containing epoxy groups, typically an epoxytriazine-capped polyphenylene ether, with a polyarylene sulfide containing epoxide-reactive functional groups, preferably amine groups. It is sometimes advantageous to anneal said compositions or molded articles prepared therefrom.

Polyphenylene ether-polyarylene sulfide compositions

Polyarylene sulfides react with disulfides containing reactive functional groups, typically at temperatures within the range of about 225.degree.-375.degree. C., yielding reactively capped polyarylene sulfides. The preferred reactive functional groups are amino groups and carboxy groups and functional derivatives thereof.

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Schenectady, NY, United States of America

Andrew J Caruso