Patents by Inventor Patrick Joseph McCloskey

Patrick Joseph McCloskey has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Polycarbonate redistribution method with catalyst decomposition
    Patent number: 5886073
    Abstract: Redistribution of polycarbonate compositions is effected in the presence of a tetraorganophosphonium hydroxide as catalyst and a catalyst decomposing amount of a polyhydroxyaliphatic compound such as glyceryl monostearate, pentaerythritol or ethylene glycol. Catalyst decomposition after redistribution improves the stability of the redistributed polycarbonate composition.
    Type: Grant
    Filed: November 3, 1997
    Date of Patent: March 23, 1999
    Assignee: General Electric Company
    Inventors: Patrick Joseph McCloskey, David Michel Dardaris
  • Tetraphenols and their use as polycarbonate branching agents
    Patent number: 5863992
    Abstract: Branched polycarbonates having properties suitable for blow molding are prepared by equilibrating a linear or branched aromatic polycarbonate with certain tetraphenols, especially 2,2,5,5-tetrakis (4-hydroxyphenyl)hexane and ?1,1-bis(p-hydroxyphenyl)ethyl!-phenyl ether.
    Type: Grant
    Filed: December 17, 1996
    Date of Patent: January 26, 1999
    Assignee: General Electric Company
    Inventors: Patrick Joseph McCloskey, David Michel Dardaris, YeGang Lin, Pin-Pin Wu, Jimmy Lynn Webb
  • Method for preparing 1,1,1-tris(4-hydroxyphenyl)ethane
    Patent number: 5763686
    Abstract: 1,1,1-Tris(4-hydroxyphenyl)ethane, a branching agent for polycarbonates, is prepared by the reaction of phenol with 2,4-pentanedione in the presence of sulfuric acid and at least one mercapto sulfonic acid such as 3-mercaptopropanesulfonic acid as promoter. By employing specific proportions of the promoter and sulfuric acid, high product yields can be obtained in relatively short times.
    Type: Grant
    Filed: December 16, 1996
    Date of Patent: June 9, 1998
    Assignee: General Electric Company
    Inventors: Patrick Joseph McCloskey, Eric James Pressman
  • Quaternary bisphenolates, methods for their preparation, and uses thereof
    Patent number: 5756843
    Abstract: Quaternary salts having a double helix structure are prepared by the reaction of dihydroxyaromatic compound, preferably a bisphenol, with an alkali metal hydroxide and a quaternary salt, such as a tetraalkylammonium or hexaalkylguanidinium chloride. The quaternary salts and their alkaline hydrolysis products are useful as catalysts in various reactions, including imide formation from bisphenol salts and halo- or nitro-substituted phthalimides and redistribution and equilibration of polycarbonates.
    Type: Grant
    Filed: December 17, 1996
    Date of Patent: May 26, 1998
    Assignee: General Electric Company
    Inventors: Jimmy Lynn Webb, Matthew Hal Littlejohn, Joseph John Caringi, Thomas Link Guggenheim, Robert Joseph Nick, Patrick Joseph McCloskey, Joseph Anthony King, Jr.
  • Method for preparing and purifying 1,1,1-tris(4-hydroxyphenyl)ethane
    Patent number: 5756859
    Abstract: 1,1,1-Tris(4-hydroxyphenyl)ethane in admixture with bisphenol A is obtained by the reaction of 2,4-pentanedione with excess phenol under acidic conditions and in the presence of a mercapto compound as promoter. The products may be separated by extracting bisphenol A with a chlorinated alkane. Purification of the resulting 1,1,1-tris(4-hydroxyphenyl)ethane is achieved by slurrying in and/or recrystallization from methanol-water, optionally with addition of an alkali metal borohydride or dithionite.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: May 26, 1998
    Assignee: General Electric Company
    Inventors: Patrick Joseph McCloskey, Paul Dean Sybert, Julia Lam Lee, David Michel Dardaris
  • Method for purifying 1,1,1-tris(4-hydroxyphenyl)-alkanes
    Patent number: 5672776
    Abstract: Tris(4-hydroxyphenyl)alkanes such as 1,1,1 -tris(4-hydroxyphenyl)ethane are purified by formation of an adduct with a molar excess of a C.sub.1-4 primary alkyl tertiary amine, preferably triethylamine. Adduct formation is preferably effected in a polar organic solvent such as methanol. The pure tris(4-hydroxyphenyl)alkane may be recovered from the adduct by thermal or aqueous acid-promoted cracking.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: September 30, 1997
    Assignee: General Electric Company
    Inventors: Patrick Joseph McCloskey, Julia Lam Lee
  • Redistribution of organic polyestercarbonate compositions
    Patent number: 5652312
    Abstract: Polyestercarbonates, particularly those containing aliphatic dicarboxylic acid-derived structural units, are redistributed by heating in the presence of a carbonate redistribution catalyst, and, optionally, a diaryl carbonate. The redistribution products have weight average molecular weights different from, and typically lower than, the initial molecular weight.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: July 29, 1997
    Assignee: General Electric Company
    Inventors: Peter David Phelps, Eugene Pauling Boden, Patrick Joseph McCloskey, David Michel Dardaris, Adelbert Hermannus Leonardus Groothuis
  • Polycarbonate redistribution using diethyldimethylammonium hydroxide as catalyst
    Patent number: 5650470
    Abstract: Polycarbonate compositions are redistributed by melt equilibration using diethyldimethylammonium hydroxide as the redistribution catalyst. This catalyst affords an odorless polycarbonate product having a very low residual amine level.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: July 22, 1997
    Assignee: General Electric Company
    Inventors: Patrick Joseph McCloskey, Eric Thomas Gohr, Timothy Hans Lemmen