Patents by Inventor James H. Rea
James H. Rea 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).
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Patent number: 5625007Abstract: The present invention pertains to polymers comprising poly(4-hydroxystyrene) or substituted poly(4-hydroxystyrene) or both. The polymers have low optical density (absorbance) over a wavelength range from about 240 to about 260 nm, as well as low optical density over the near UV and visible spectrum (310 to 800 nm). Such polymers are produced by polymerizing 4-acetoxystyrene and/or substituted 4-acetoxystyrene monomers, with or without other comonomers, and subsequently performing transesterification. In the most preferred embodiment of the present invention, the polymers are produced using at least one alcohol as a reaction medium, a chain transfer agent and a transesterification reactant, providing an unusually economic process. These polymers are particularly useful as photoresist components for use in combination with deep UV, X-ray, and E-Beam imaging systems.Type: GrantFiled: August 24, 1994Date of Patent: April 29, 1997Assignee: Hoechst Celanese Corp.Inventors: Michael T. Sheehan, James H. Rea
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Patent number: 5304690Abstract: 4-Acetoxystyrene is reacted with a base in a solvent to form a salt of 4-hydroxystyrene via saponification. Alternatively, 4-hydroxystyrene is reacted with a base to form a salt of 4-hydroxystyrene. In the latter case, the 4-hydroxystyrene is prepared by the transesterification of 4-acetoxystyrene. Subsequently or simultaneously, the salt of 4-hydroxystyrene is reacted, preferably in situ, with di-tertiary-butyl-dicarbonate to form 4-tertiarybutoxycarbonyloxystyrene.Type: GrantFiled: June 22, 1993Date of Patent: April 19, 1994Assignee: Hoechst Celanese CorporationInventors: George Kvakovszky, James H. Rea, Michael I. Sheehan, Brad L. Smith
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Patent number: 5256809Abstract: 4-Acetoxystyrene is reacted with a base in a solvent to form a salt of 4-hydroxystyrene via saponification. Alternatively, 4-hydroxystyrene is reacted with a base to form a salt of 4-hydroxystyrene. In the latter case, the 4-hydroxystyrene is prepared by the transesterification of 4-acetoxystyrene. Subsequently or simultaneously, the salt of 4-hydroxystyrene is reacted, preferably in situ. with di-tertiary-butyl-dicarbonate to form 4-tertiary-butoxycarbonyloxystyrene.Type: GrantFiled: September 3, 1992Date of Patent: October 26, 1993Assignee: Hoechst Celanese CorporationInventors: George Kvakoyszky, James H. Rea, Michael T. Sheehan, Brad L. Smith
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Patent number: 5241098Abstract: The present invention pertains to a method of forming a salt of 4-hydroxystyrene by reacting 4-acetoxystyrene with a suitable base in a suitable solvent system. Subsequently, or simultaneously, the salt of 4-hydroxystyrene can be reacted, preferably in situ, with di-tertiary-butyl-dicarbonate to form 4-tertiary-butoxycarbonyloxystyrene.Type: GrantFiled: November 16, 1990Date of Patent: August 31, 1993Assignee: Hoechst Celanese CorporationInventors: George Kvakovszky, James H. Rea, Michael T. Sheehan, Brad L. Smith
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Patent number: 5239015Abstract: The present invention pertains to a process for the preparation of polymers comprising poly(4-hydroxystyrene) or substituted poly(4-hydroxystyrene) or both. The polymers have low optical density (absorbance) over a wavelength range from about 240 to about 260 nm, as well as low optical density over the near UV and visible spectrum (310 to 800 nm). Such polymers are produced by polymerizing 4-acetoxystyrene and/or substituted 4-acetoxystyrene monomers, with or without other comonomers, and subsequently performing transesterification. In the most preferred embodiment of the present invention, the polymers are produced using at least one alcohol as a reaction medium, a chain transfer agent and a transesterification reactant, providing an unusually economic process. These polymers are particularly useful as photoresist components for use in combination with deep UV, X-ray, and E-Beam imaging systems.Type: GrantFiled: May 28, 1991Date of Patent: August 24, 1993Assignee: Hoechst Celanese CorporationInventors: Michael T. Sheehan, James H. Rea
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Patent number: 5047542Abstract: A novel method is disclosed for the preparation of 2,3-pyridine-dicarboxylates by the reaction of a ketoester such as dimethyl oxalacetate with an .alpha.,.beta.-unsaturated aldehyde or ketone such as 2-ethylacrolein and at least 1 molar equivalent of ammonium salt in suitable solvent.Type: GrantFiled: July 1, 1988Date of Patent: September 10, 1991Assignee: Hoechst Celanese CorporationInventors: B. Franklin Gupton, James H. Rea, Werner H. Mueller, John Saukaitis
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Patent number: 4973639Abstract: In one embodiment this invention provides a novel polymerizable quaternary ammonium carbonate corresponding to the formula: ##STR1## In another embodiment this invention provides a novel copolymer of the above represented methacrylamidopropyltrimethylammonium methyl carbonate and acrylamide, which exhibits a high level clay flocculation efficiency.Type: GrantFiled: October 25, 1989Date of Patent: November 27, 1990Assignee: Hoechst Celanese CorporationInventors: Thomas C. Shen, James H. Rea
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Patent number: 4910325Abstract: In one embodiment this invention provides a novel polymerizable quaternary ammonium carbonate corresponding to the formula: ##STR1## In another embodiment this invention provides a novel copolymer of the above represented methacrylamidopropyltrimethylammonium methyl carbonate and acrylamide, which exhibits a high level clay flocculation efficiency.Type: GrantFiled: January 25, 1989Date of Patent: March 20, 1990Assignee: Hoechst Celanese CorporationInventors: Thomas C. Shen, James H. Rea
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Patent number: 4871859Abstract: A novel method is disclosed for the preparation of 2,3-pyridine-dicarboxylates by the reaction of a ketoester such as dimethyl oxalacetate with an .alpha.,.beta.-unsaturated aldehyde or ketone such as 2-ethylacrolein and at least 1 molar equivalent of ammonium salt in suitable solvent utilizing a dehydrogenation catalyst such as palladium on carbon.Type: GrantFiled: March 2, 1988Date of Patent: October 3, 1989Assignee: Hoechst Celanese CorporationInventors: B. Franklin Gupton, James H. Rea, Werner H. Mueller
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Patent number: 4414053Abstract: A polymer composition is disclosed and consists essentially of 100 parts by weight of an ethylene-alkyl acrylate copolymer and about 1 to 5 parts by weight of a polymer of a higher alkyl ester of acrylic or methacrylic acid. The polymer compositions have a lower heat seal strength than the ethylene-alkyl acrylate copolymer contained therein.Type: GrantFiled: December 6, 1982Date of Patent: November 8, 1983Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, James H. Rea
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Patent number: 4373066Abstract: Compatible blends of polymers are disclosed which contain (a) a low density ethylene polymer, (b) a copolymer of ethylene and an alkyl ester of acrylic or methacrylic acid or vinyl acetate, (c) an ionomer resin, and (d) a tackifying resin such as an aromatic hydrocarbon resin.Type: GrantFiled: January 12, 1981Date of Patent: February 8, 1983Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, Pallavoor R. Lakshmanan, James H. Rea
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Patent number: 4367113Abstract: Compatible blends of polymers are disclosed which contain (a) a high density ethylene polymer or an isotactic propylene polymer, (b) a copolymer of ethylene and an alkyl ester of acrylic or methacrylic acid or vinyl acetate, (c) an ionomer resin, and (d) a tackifying resin such as a terpene resin.Type: GrantFiled: June 29, 1981Date of Patent: January 4, 1983Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, Pallavoor R. Lakshmanan, James H. Rea
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Patent number: 4337297Abstract: Blends of thermoplastic polymers which may be coextruded to form bonding layers in film laminates contain (a) a copolymer of ethylene with a lower alkyl acrylate or methacrylate or vinyl acetate, (b) a chlorinated ethylene polymer and optionally (c) a tackifying resin.Type: GrantFiled: July 16, 1981Date of Patent: June 29, 1982Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, James H. Rea
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Patent number: 4337298Abstract: Compatible blends of polymers are disclosed which contain (a) a low density ethylene polymer, (b) a copolymer of ethylene and an alkyl ester of acrylic or methacrylic acid or vinyl acetate, (c) an ionomer resin, and (4) optionally a tackifying resin such as a glyceryl ester of a rosin acid.Type: GrantFiled: August 5, 1981Date of Patent: June 29, 1982Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, Pallavoor R. Lakshmanan, James H. Rea
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Patent number: 4288572Abstract: A compatible blend of polymers is disclosed and consists essentially of 100 parts by weight of an ethylene-alkyl acrylate copolymer and about 0.2 to 3 parts by weight of either poly(ethylene adipate) or poly(trimethylene adipate). The polymer blends have a lower sealing temperature than the ethylene-alkyl acrylate copolymer contained therein.Type: GrantFiled: July 28, 1980Date of Patent: September 8, 1981Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, James H. Rea
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Patent number: 4288573Abstract: A compatible blend of polymers is disclosed and consists essentially of 100 parts by weight of a low density ethylene polymer and about 0.2 to 3 parts by weight of either poly(ethylene adipate) or poly(trimethylene adipate). The polymer blends have a lower sealing temperature than the low density ethylene polymer contained therein.Type: GrantFiled: July 28, 1980Date of Patent: September 8, 1981Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, James H. Rea
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Patent number: 4283551Abstract: A group of heat curable resins are provided which have good physical properties, which properties are retained to a surprising degree after prolonged exposure to temperatures as high as 300.degree. C. The products are acetylene end-capped polyesters prepared by reacting a hydroxyphenylacetylene with a diacid chloride of an aromatic dibasic acid such as 4,4'-benzophenone dicarboxylic acid dichloride.Type: GrantFiled: September 13, 1979Date of Patent: August 11, 1981Assignee: Gulf Oil CorporationInventors: Wai Y. Chow, Daniel J. Hurley, James H. Rea, S. Paul Thackaberry
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Patent number: 4276111Abstract: A polymer composition is disclosed and consists essentially of 100 parts by weight of an ethylene-alkyl acrylate copolymer and about 1 to 15 parts by weight of an ester formed from a rosin acid and ethylene glycol, propylene glycol, or glycerine. The polymer compositions have a lower heat sealing temperature than the ethylene-alkyl acrylate copolymer contained therein.Type: GrantFiled: July 31, 1980Date of Patent: June 30, 1981Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, James H. Rea
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Patent number: 4273893Abstract: Compatible ternary polymer blends are disclosed which consist essentially of a low density ethylene polymer, an ethylene-alkyl acrylate copolymer, and an amorphous isobutylene polymer. The compositions seal well at temperatures below those required for heat sealing ethylene polymers.Type: GrantFiled: July 31, 1980Date of Patent: June 16, 1981Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, James H. Rea
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Patent number: 4225550Abstract: Fine particles of acetylene end-capped polyimide oligomers are copression-molded at ambient temperature. The preformed moldings are cured without melting the resin by heating to an elevated temperature which is lower than the oligomer's melting point.Type: GrantFiled: November 24, 1978Date of Patent: September 30, 1980Assignee: Gulf Oil CorporationInventors: Khalid A. Karim, James H. Rea