David M Dardaris

US Patent:

6392079, May 21, 2002

Filed:

Mar 30, 1999

Appl. No.:

09/281498

Inventors:

James Manio Silva - Clifton Park NY
David Michel Dardaris - Ballston Spa NY
Peter David Phelps - Schenectady NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

C07C 6996

US Classification:

558282, 558280

Abstract:

A continuous process for the preparation of monofunctional aromatic chloroformates (MAC) having the structure (I) wherein n is an integer from 1 to 5, and R represents hydrogen, a branched or unbranched alkyl group having from 1-15 carbon atoms, an aryl group which may be substituted or unsubstituted, a cycloaliphatic group which may be substituted or unsubstituted, or an arylalkyl group which may be substituted or unsubstituted, the method comprising the steps of a) introducing 1) an aqueous caustic solution; 2) a carbonyl chloride; 3) at least one monofunctional hydroxyaromatic compound; and 4) at least one inert organic solvent into a continuous reaction system; and b) effecting contact between 1), 2), 3) and 4) for a time and at conditions sufficient to produce a MAC of structure (I).

US Patent:

6414178, Jul 2, 2002

Filed:

Jul 25, 2000

Appl. No.:

09/625476

Inventors:

James Manio Silva - Clifton Park NY
David Michel Dardaris - Ballston Spa NY
Thomas Joseph Fyvie - Schenectady NY
Pierre-Andre Bui - Clifton Park NY
Daniel Joseph Brunelle - Burnt Hills NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

C07C 6976

US Classification:

560 8, 560101, 528198, 558282

Abstract:

This invention relates to a process and apparatus for the continuous preparation of mono and bis-chloroformate products of halogenated dihydroxy compounds by an interfacial process. The mono and bis-chloroformate products may optionally be converted to capped oligomers.

US Patent:

6562937, May 13, 2003

Filed:

Mar 1, 2001

Appl. No.:

09/795180

Inventors:

James Manio Silva - Clifton Park NY
David Michel Dardaris - Ballston Spa NY
Thomas Joseph Fyvie - Schenectady NY
Daniel Joseph Brunelle - Burnt Hills NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

C08H 6368

US Classification:

528202, 528198, 528196

Abstract:

In a continuous flow reactor one or more bisphenols is converted by the action of phosgene and aqueous base into a mixture of mono- and bisphenol chloroformates which are then treated with a catalyst, additional aqueous caustic and a monophenol to afford endcapped polycarbonates. At relatively high levels of added monophenol endcapped polycarbonate oligomers are obtained. The method is especially suited for the continuous preparation of endcapped oligomers of tetrabromobisphenol A polycarbonate. The method is characterized by efficient use of phosgene, and conversion of chloroformate groups to carbonate linkages aided by trialkylamine catalysts bearing at least one methyl group on nitrogen, such as N,N-dimethylbutylamine (DMBA).

US Patent:

6664366, Dec 16, 2003

Filed:

Mar 25, 2002

Appl. No.:

10/105563

Inventors:

James Manio Silva - Clifton Park NY
David Michel Dardaris - Ballston Spa NY
Gregory Allen ONeil - Clifton Park NY
Joseph Anthony Suriano - Clifton Park NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

C08F 612

US Classification:

528486, 528489, 528490, 528497, 528499, 528194, 528176, 528302, 5283086, 528104, 525165, 525 58, 525133, 525191, 4284237, 428 358, 428 359

Abstract:

Thermally stable polymers comprising chain members derived from at least one 1,3-dihydroxybenzene moiety and at least one aromatic dicarboxylic acid moiety, said polymer being substantially free of anhydride linkages linking at least two mers of the polymer chain, are prepared using an interfacial method comprising the steps of: (a) combining at least one 1,3-dihydroxybenzene moiety and at least one catalyst in a mixture of water and at least one organic solvent substantially immiscible with water; (b) adding to the mixture from (a) a controlled stoichiometric ratio of at least one acid chloride and at least one base while maintaining the pH between about 4 and about 8. 5, and (c) adjusting the pH of the reaction mixture to a value in the range of about 7 and about 9 following complete addition of acid chloride, and stirring the reaction mixture for a time sufficient to destroy any anhydride linkages in the polymer chain.

US Patent:

6723864, Apr 20, 2004

Filed:

Aug 16, 2002

Appl. No.:

10/223030

Inventors:

James Manio Silva - Clifton Park NY
David Michel Dardaris - Ballston Spa NY
Gary Charles Davis - Albany NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G07F 718

US Classification:

556416, 556417, 556439, 556440, 556441

Abstract:

Siloxane bischloroformates are prepared in a continuous process by phosgenating siloxane bisphenols in a flow reactor using a substantial excess of phosgene and sodium hydroxide. While very high levels ( 95%) of conversion of the siloxane bisphenol to the corresponding siloxane bischloroformate are achieved using a flow reactor according to the method of the invention, only more modest conversion (Ë90%) of the siloxane bisphenol to the corresponding siloxane bischloroformate is attained when analogous batch processes are employed. The process holds promise for use in the manufacture of silicone-containing copolycarbonates which requires high purity siloxane bischloroformate intermediates.

US Patent:

6780961, Aug 24, 2004

Filed:

Oct 16, 2002

Appl. No.:

10/271363

Inventors:

James Manio Silva - Clifton Park NY
Pierre-Andre Bui - Clifton Park NY
Thomas Joseph Fyvie - Schenectady NY
David Michel Dardaris - Ballston Spa NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

C08G 6400

US Classification:

528196, 422131, 422135, 502200, 502208, 528198, 2642761, 264219

Abstract:

A new method of converting oligomeric chloroformates to high molecular weight polycarbonate is presented. By carefully controlling the relative concentrations and amounts of hydroxyl and chloroformate groups present in the oligomeric polycarbonate, the method of the invention provides for the efficient preparation of polycarbonate while minimizing phosgene usage. The product polycarbonates prepared by the method of the invention are fully capped with no additional phosgene required beyond that needed to prepare the oligomeric chloroformate starting material. The method of the present invention provides polycarbonates having non-detectable levels (5 ppm) of aromatic hydroxyl endgroups, low polydispersity, and low levels of residual monomer and endcap, thereby obviating the need for monomer and endcap recycle.

US Patent:

6812320, Nov 2, 2004

Filed:

Mar 25, 2002

Appl. No.:

10/105565

Inventors:

James Manio Silva - Clifton Park NY
David Michel Dardaris - Ballston Spa NY
Gregory Allen ONeil - Clifton Park NY
Paul Dean Sybert - Evansville IN
Zhaohui Su - Evansville IN

Assignee:

General Electric Company - Schenectady NY

International Classification:

C08G 6400

US Classification:

528198, 525461, 525462, 528176, 528193, 528194, 528196, 528271, 528272

Abstract:

Thermally stable block copolyestercarbonates comprising chain members derived from at least one dihydroxy-substituted aromatic hydrocarbon moiety and at least one aromatic dicarboxylic acid moiety, said polymer being substantially free of anhydride linkages linking at least two mers of the polyester chain segments, are prepared by a method comprising the steps of: (a) preparing a hydroxy-terminated polyester intermediate comprising structural units derived from at least one dihydroxy-substituted aromatic hydrocarbon moiety and at least one aromatic dicarboxylic acid moiety; and (b) conducting a reaction of the polyester intermediate with phosgene in a reaction mixture comprising water, a substantially water-immiscible organic solvent, and a base, wherein base and phosgene are added simultaneously to the reaction mixture at a substantially constant molar ratio of base to phosgene for a time period of at least about 60% of the total amount of phosgene added.

US Patent:

6833422, Dec 21, 2004

Filed:

Aug 16, 2002

Appl. No.:

10/223037

Inventors:

James Manio Silva - Clifton Park NY
David Michel Dardaris - Ballston spa NY
Gary Charles Davis - Albany NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

C08G 7704

US Classification:

528 29, 528 25

Abstract:

Silicone-containing copolycarbonates possessing relatively long siloxane chains and yet having low haze values and hence transparency are prepared by reacting a siloxane bischloroformate with a hydroxy-terminated polycarbonate oligomer to afford a silicone-containing polycarbonate intermediate which is then reacted with a bisphenol, phosgene and a chainstopper under interfacial reaction conditions to afford a product silicone-containing copolycarbonate. The product silicone-containing copolycarbonates have lower haze values than similarly constituted copolycarbonates prepared by other methods.