Patents Assigned to Occidental Chemical Corporation
  • Glycidyl diamines containing aromatic trifluoromethyl group and epoxy resins prepared therefrom
    Patent number: 5283270
    Abstract: Disclosed are glycidyl diamines having the formulas ##STR1## where n is 1 or 2, m is 0, 1, or 2, X is Y or ##STR2## and Y is --, O, S, SO, SO.sub.2, CO, C(CH.sub.3).sub.2, or C(CF.sub.3).sub.2. An epoxy resin can be made by mixing the glycidyl diamine with an epoxy curing agent. The epoxy resins can be used as adhesives or to make composites.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: February 1, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Robert A. Buchanan, Robert L. Ostrozynski
  • Vanadium removal in aqueous streams
    Patent number: 5279804
    Abstract: Disclosed is a method of removing soluble vanadium from an aqueous stream containing sodium chromate or sodium bichromate. The liquor is passed over a water-insoluble trivalent chromium compound, and the vanadium in the liquor is extracted from the liquor onto the trivalent chromium compound. The process is especially useful in removing vanadium from a recycled concentrated sodium bichromate liquor to prevent the buildup of vanadium therein.
    Type: Grant
    Filed: August 27, 1992
    Date of Patent: January 18, 1994
    Assignee: Occidental Chemical Corporation
    Inventors: Robert L. Zeller, III, Russell J. Morgan, Ursula I. Keller
  • Process for preparing chloro-N-phenylphthalimide
    Patent number: 5264588
    Abstract: Disclosed is a method of preparing a chloro-N-phenylphthalimide. A solution is prepared of a chlorophthalic acid or anhydride and aniline in water as the only solvent and the solution is heated to produce the product. The preferred chlorophthalic acid is 3,4,6-trichlorophthalic acid.
    Type: Grant
    Filed: September 17, 1992
    Date of Patent: November 23, 1993
    Assignee: Occidental Chemical Corporation
    Inventor: Chandrasekhar Krishnan
  • Method of denuding sodium mercury amalgam and producing sodium alcoholates
    Patent number: 5262133
    Abstract: Disclosed is a method of denuding a sodium-mercury amalgam to recover mercury therefrom and produce a sodium alcoholate. The amalgam is reacted with a C.sub.1 to C.sub.4 alcohol in the presence of a catalyst selected from the group consisting of tungsten carbide, iron treated high density carbon, iridium, ruthenium, and mixtures thereof. The resulting sodium alcoholate is separated from the mercury.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: November 16, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Robert G. Adams, Tilak V. Bommaraju, Sharon D. Fritts
  • Method of cleaning epoxy articles
    Patent number: 5244507
    Abstract: Disclosed is a method of removing synthetic and natural resins from an article containing an epoxy resin without damaging the epoxy resin. The article is contacted with a solvent having the formula ##STR1## where n is 1 or 2, which dissolves the synthetic and natural resins and forms a solution. The solution is then separated from the article. The solvent can be recovered from the solution.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: September 14, 1993
    Assignee: Occidental Chemical Corporation
    Inventor: Edward A. Rowe
  • Method and apparatus for cleaning articles
    Patent number: 5242502
    Abstract: Disclosed is a method and degreasing apparatus for cleaning articles. The articles are contacted with a chlorinated benzotrifluoride liquid which is subsequently washed from the articles using liquid methylene chloride. The degreaser includes means for applying the liquids to the articles and can also include means for evaporating some of the methylene chloride to render vapors of the chlorinated benzotrifluoride nonflammable.
    Type: Grant
    Filed: June 2, 1992
    Date of Patent: September 7, 1993
    Assignee: Occidental Chemical Corporation
    Inventor: Edward A. Rowe
  • Process for making polyvinyl chloride using phenothiazine oligomer
    Patent number: 5243000
    Abstract: A microsuspension polymerization process for polymerizing vinyl chloride and optional comonomers to polyvinyl chloride and optional copolymers is disclosed which comprises conducting the polymerization in a tubular reaction zone without agitation in the presence of a compound having the formula ##STR1##
    Type: Grant
    Filed: October 20, 1989
    Date of Patent: September 7, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Paul O. Hong, Raymond C. DeWald
  • Photocrosslinkable polyimide ammonium salts
    Patent number: 5241041
    Abstract: Disclosed is a polyimide ammonium salt comprising the reaction product of an ethylenically unsaturated amine with an aromatic polyimide having pendant carboxylic acid groups, said polyimide comprising the reaction product of diamine and aromatic dianhydride, where the diamine comprises an aromatic carboxylic acid diamine having at least one carboxylic acid. A substrate can be coated with the polyimide ammonium salt by forming a composition of a crosslinking agent and a solution of the polyimide salt in an organic solvent, spreading the composition on the substrate, evaporating the solvent to form a coating, exposing at least some of the coating to actinic radiation to crosslink and insolubilize the exposed portions of the coating, and washing the unexposed portions away by dissolving them in an organic solvent.
    Type: Grant
    Filed: December 16, 1991
    Date of Patent: August 31, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Jin-O Choi, John A. Tyrell
  • Solvent mixtures having enhanced evaporation
    Patent number: 5240641
    Abstract: Disclosed is a mixture of about 1 to about 99 volume percent monochlorotoluene and about 1 to about 99 volume percent monochlorobenzotrifluoride. Also disclosed is a mixture of about 10 to about 60 volume percent monochlorotoluene, about 10 to about 60 volume percent monochlorobenzotrifluoride, and about 30 to about 60 volume percent perchloroethylene. The mixtures are used as solvents to form coatings of organic polymers and to clean parts.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: August 31, 1993
    Assignee: Occidental Chemical Corporation
    Inventor: Edward A. Rowe
  • Process for the manufacture of linear polyethylene containing .alpha.-alkene commonomers
    Patent number: 5236998
    Abstract: A process for making a blend of high-density polyethylene polymers containing one or more C3 to C12 .alpha.-olefin comonomers. The process begins in two parallel streams. In one stream ethylene is polymerized alone, and in the second stream ethylene is polymerized with the comonomer(s). The two streams are combined in a subsequent reactor where the polymerization process is completed. The polymerization produces a polymer wherein the comonomer is concentrated in the higher molecular weight fractions.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: August 17, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Allan J. Lundeen, James E. Feig
  • Preparation of 2,4,5-trifluorobenzoic acid by decarboxylation of 3,4,6-trifluorophthalic acid
    Patent number: 5233085
    Abstract: 3,4,6-Trifluorophthalic acid may be decarboxylated in a controlled manner to form 2,4,5-trifluorobenzoic acid by heating the phthalic acid in a dipolar aprotic solvent in the absence of any catalyst.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: August 3, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Neil J. O'Reilly, William S. Derwin, Henry C. Lin
  • Process for the preparation of halophthalic anhydrides
    Patent number: 5233054
    Abstract: Halophthalic anhydrides are prepared by the liquid phase reaction of a brominating agent with halogen substituted hexa- or tetra-hydrophthalic anhydrides.
    Type: Grant
    Filed: June 26, 1991
    Date of Patent: August 3, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: David Y. Tang, Mary K. Cocoman, Harry E. Buckholtz
  • Highly fluorinated bis-imides
    Patent number: 5233049
    Abstract: This invention relates to novel fluorinated bis-imides of the formula ##STR1## where X is H or F. The compounds are useful as additives to enhance the properties of high performance polymers such as polyimides.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: August 3, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Frank J. Dinan, Willis T. Schwartz, Roger A. Wolfe
  • Method of making 3-hydroxy-2,4,5-trifluorobenzoic acid
    Patent number: 5233082
    Abstract: Disclosed is a method of making 3-hydroxy-2,4,5-trifluorobenzoic acid. A aqueous solution is prepared of an alkali metal base and a tetrafluorophthalimide. The solution is heated to produce a mixture of a salt of a 4-hydroxy-3,5,6-trifluorophthalamic acid and a salt of a 3-hydroxy-2,4,5-trifluorobenzamide. The solution is neutralized with acid to form a precipitate of the 4-hydroxy-3,5,6-trifluorophthalamic acid and the 3-hydroxy-2,4,5-trifluorobenzamide. The precipitate is reacted with a mineral acid to produce 3-hydroxy-2,4,5-trifluorobenzoic acid.
    Type: Grant
    Filed: November 16, 1982
    Date of Patent: August 3, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Lawrence B. Fertel, William S. Derwin
  • Apparatus for molding undercut parts
    Patent number: 5219594
    Abstract: Disclosed is a molding apparatus which includes(A) a mold for making an undercut part which includes coring sandwiched between top and bottom cavity halves, where the coring is divided into three or four sections; and(B) a press for(1) separating the coring from the top and bottom cavity halves; and(2) separating the sections from each other.
    Type: Grant
    Filed: August 10, 1992
    Date of Patent: June 15, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Leon G. Meyer, Thomas T. Brylinski
  • Fluoride removal from aqueous streams
    Patent number: 5215632
    Abstract: Disclosed is a method of removing fluoride and sulfate ions from an aqueous stream by adding calcium chloride and a source of phosphate ion to the stream to form a first precipitate of calcium sulfate and a compound of calcium, fluoride, and phosphate. The precipitate is separated from the aqueous stream and a source of carbonate ion is added to the stream to form a second precipitate which contains fluoride and calcium. The second precipitate is then separated from the aqueous stream.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: June 1, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Sharon D. Fritts, Tilak V. Bommaraju, Walter W. Ruthel
  • Method of making chromic oxide
    Patent number: 5215727
    Abstract: Disclosed is a method of making hydrated chromic oxide of low sodium content by forming an aqueous solution of sodium bichromate, reducing the sodium bichromate to chromic oxide using sucrose or formaldehyde, which results in the precipitation of chromic oxide, filtering the hydrated chromic oxide, acid repulping and filtering or calcining the hydrated chromic oxide, followed by water repulp and filtering with displacement washing. The color of the particle can be controlled by the drying temperature. A composite particle of hydrated chromic oxide/carbon can be made by forming a slurry of the aqueous solution of sodium bichromate with powdered carbon. The composite particle can be heated to directly produce chrome metal.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: June 1, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Robert L. Zeller, III, Karl W. Seper, Russell J. Morgan
  • Polyimidesiloxane extended block copolymers
    Patent number: 5209981
    Abstract: Disclosed is method of making a polyimidesiloxane extended block copolymer containing at least one polyimide block made by reacting a dianhydride with a diamine that does not contain a siloxane group, and at least one polyimidesiloxane block made by reacting a dianhydride with a diamine that contains at least one siloxane group, where each polyimidesiloxane block is prepared using more than one mole of the dianhydride for each mole of the siloxane-containing diamine. That is, any siloxane-imide blocks in the polyimidesiloxane are formed from amic acid blocks terminated in anhydride groups and any imide blocks in the polyimidesiloxane are formed from amic acid blocks terminated in amine groups. The polyimidesiloxane block copolymers have higher glass transition temperatures than the corresponding non-extended block copolymers while retaining the same solubility.
    Type: Grant
    Filed: June 13, 1991
    Date of Patent: May 11, 1993
    Assignee: Occidental Chemical Corporation
    Inventor: Sergio Rojstaczer
  • Process for the preparation of halophthalic anhydrides
    Patent number: 5206391
    Abstract: A process for the preparation of a halophthalic anhydride, such as chlorophthalic anhydride, comprising the liquid phase reaction of bromine with a halogen substituted hexa- or tetra-hydrophthalic anhydride to produce halophthalic anhydride and gaseous HBr, and reacting the gaseous HBr with chlorine to regenerate bromine.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: April 27, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Karl W. Seper, Edward J. Colman, David Y. Tang, Mary K. Cocoman, Harry E. Buckholtz
  • Halogenated trifluoromethylbenzenes
    Patent number: 5196593
    Abstract: Novel halogenated trifluoromethylbenzenes have the structural formula ##STR1## wherein X is halogen, preferably Cl, F or Br, and R is a group selected from the group consisting of --COOH, --C(O)NH.sub.2 and --CN. These compounds are intermediates for pesticidal trifluoromethyl diphenyl ethers and are converted thereto by replacing the fluorine para to the trifluoromethyl with substituted phenoxy group in aromatic nucleophilic substitution.
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: March 23, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Karl W. Seper, James J. Maul, Henry C. Lin