Patents Represented by Attorney James F. Tao

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  • Fire retardant thermoplastic polyester and polyesterether compositions
    Patent number: 4719256
    Abstract: Thermoplastic polyester and polyesterether compositions having improved flame retardance, smoke generation and heat aging, reduced blooming and superior high temperature processability comprise a thermoplastic polyester or polyesterether resin derived from 1,4-butanediol and dimethyl terephthalate, antimony oxide, optionally fiberglass, and a chlorinated bisimide of the formula ##STR1##
    Type: Grant
    Filed: July 23, 1984
    Date of Patent: January 12, 1988
    Assignee: Occidental Chemical Corporation
    Inventor: Ronald L. Markezich
  • Phosphorus recovery from phosphorus-containing pond sludge
    Patent number: 4717558
    Abstract: A process is described for recovering phosphorus from pond sludge found in ponds located near phosphorus plants. An aqueous solution of the sludge, which has a phosphorus concentration in the range of 5% to 70% by weight, is heated at a temperature in the range of 165.degree. F. to 212.degree. F., preferably for about 1/2 hour to about 6 hours, washed with water at an elevated temperature, and then reheated. A phosphorus layer having an enhanced concentration of recoverable elemental phosphorus is formed as a result of this process.
    Type: Grant
    Filed: October 29, 1986
    Date of Patent: January 5, 1988
    Assignee: Occidental Chemical Corporation
    Inventors: Steven M. Beck, Edward H. Cook, Jr.
  • Container for transporting hazardous chemicals
    Patent number: 4712711
    Abstract: An improved container is provided for transporting hazardous chemicals, and particularly chlorinated organic chemicals, such as benzoyl chloride. The improved container comprises a standard drum generally having a lining of a protective material, a removable cover, a rigid high density polyethylene bottle fitted inside the drum, and an inner lid fitted inside the drum and placed on top of the polyethylene bottle. The polyethylene bottle is provided with at least one (1) outlet projecting upwardly through a corresponding opening in the inner lid. At least one cap is provided for sealing the bottle against leakage of fluid, and the inner lid is securely fastened to the inside of the drum and to the polyethylene bottle.
    Type: Grant
    Filed: March 5, 1982
    Date of Patent: December 15, 1987
    Assignee: Occidental Chemical Corporation
    Inventors: Emil J. Geering, Frank J. Grano
  • 4,4-dihalohexahydrophthalic anhydrides and 4-fluorotetrahydrophthalic anhydride, and process for their preparation
    Patent number: 4709056
    Abstract: 4,4-dihalohexahydrophthalic anhydrides of the formula ##STR1## where Y is chlorine or fluorine, are prepared by the reaction of hydrogen fluoride with 4-chlorotetrahydrophthalic anhydride.The 4,4-dihalohexahydrophthalic anhydrides of this invention can be dehydrohalogenated by reaction with basic alumina to prepare a mixture of 4-fluorotetrahydrophthalic anhydride isomers of the formula ##STR2## The 4-fluorotetrahydrophthalic anhydrides can then be dehydrogenated by reaction with a dehydrogenation catalyst to prepare 4-fluorophthalic anhydride.
    Type: Grant
    Filed: May 2, 1984
    Date of Patent: November 24, 1987
    Assignee: Occidental Chemical Corporation
    Inventors: Byron R. Cotter, Henry C. Lin, Joseph A. Pawlak
  • Polyesterether elastomer compositions having improved flame retardant properties
    Patent number: 4707506
    Abstract: Flame retardant polyesterether elastomer compositions having superior high temperature processability and heat aging properties, resistance to blooming, improved flame retardance, and reduced smoke generation and reduced dripping during burning, comprise(a) a copolyesterether elastomer prepared from dimethyl terephthalate, polyether glycol and 1,4-butanediol;(b) a chlorinated bisimide of the formula: ##STR1## (c) antimony trioxide; and (d) polytetrafluoroethylene.
    Type: Grant
    Filed: December 11, 1985
    Date of Patent: November 17, 1987
    Assignee: Occidental Chemical Corporation
    Inventor: Ronald L. Markezich
  • 3,4-difluoro-5-nitrobenzotrifluoride and preparation of fluoro-nitro-benzotrifluorides
    Patent number: 4704483
    Abstract: A process for the preparation of 3-chloro-4-fluoro-5-nitrobenzotrifluoride and 3,4-difluoro-5-nitrobenzotrifluoride by reaction of 3,4-di-chloro-5-nitrobenzotrifluoride and 4-chloro-3,5-dinitrobenzotrifluoride, respectively, with an alkali metal fluoride.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: November 3, 1987
    Assignee: Occidental Chemical Corporation
    Inventors: David Y. Tang, Byron R. Cotter, Fredrick J. Goetz
  • Production of phenolic resin composite foam
    Patent number: 4698370
    Abstract: A phenolic resin composite foam is disclosed which is prepared by heating and foaming a novolak phenolic resin having a number average molecular weight of 250 to 600 and a bulk density of 0.15 to 0.5, a blowing agent, a blowing auxiliary compound and inorganic foamed particles. Additional materials for flame retardancy can be added. The foam produced has a high compressive strength, a high foaming and rapid curing rates, a low water absorption and a minimum of friability.
    Type: Grant
    Filed: April 14, 1986
    Date of Patent: October 6, 1987
    Assignee: Sumitomo Durez Company, Ltd.
    Inventors: Yukio Saeki, Naomitsu Inoue, Yukio Tokunaga
  • Process for the preparation of oxy-diphthalic anhydrides
    Patent number: 4697023
    Abstract: Oxy-diphthalic anhydrides are prepared by reacting a halophthalic anhydride with water and an alkali metal compound such as KF, CsF or K.sub.2 CO.sub.3 in the presence of a polar, aprotic solvent.
    Type: Grant
    Filed: October 3, 1986
    Date of Patent: September 29, 1987
    Assignee: Occidental Chemical Corporation
    Inventors: Willis T. Schwartz, Joseph A. Pawlak
  • Perchloroethylene dielectric fluid containing aliphatic hydrocarbons
    Patent number: 4697043
    Abstract: Dielectric fluid is prepared by combining perchloroethylene with an aliphatic hydrocarbon having 7-9 carbon atoms in the aliphatic chain. The resulting dielectric has improved freezing point and nonflammability characteristics.
    Type: Grant
    Filed: October 1, 1986
    Date of Patent: September 29, 1987
    Assignee: Occidental Electrochemical Corporation
    Inventor: Edward A. Rowe, Jr.
  • Manufacturing method for phenol resin foam
    Patent number: 4694028
    Abstract: This invention is concerned with a method for producing phenol resin foam possessing a compact cellular structure, a high closed cell ratio and improved heat resistance. The method consists of using a resole type phenolic resin having a number average molecular weight of 150-400, surface active agents, blowing agents and curing agents, wherein at least two surface active agents are chosen from general formulas A and B, but a selection of each type must be employed ##STR1## where R.sub.1 is a saturated aliphatic hydrocarbon group of 8-14 carbon atoms and/or a 2-phenylpropyl group, and m and n are integers and meet the requirement: ##EQU1## R.sub.2 is a saturated aliphatic hydrocarbon group of 4-12 carbon atoms, M is a hydrogen atom or SO.sub.2 Na, and x is an integer of 4-110.
    Type: Grant
    Filed: April 5, 1986
    Date of Patent: September 15, 1987
    Assignee: Sumitomo Durez Company, Ltd.
    Inventors: Yukio Saeki, Naomitsu Inoue, Yukio Tokunaga
  • Catalytic process for coupling telomers of chlorotrifluoroethylene
    Patent number: 4691067
    Abstract: A process for coupling two low molecular weight telomers of chlorotrifluoroethylene comprises reacting the telomers with hydrogen in the presence of an effective amount of a catalyst to form a coupled olefin. The catalyst comprises palladium, platinum, rhodium, ruthenium, Raney nickel, Raney cobalt, and mixtures thereof, either supported or unsupported. The olefin can be fluorinated using a suitable fluorinating agent, such as chlorine trifluoride, to form a saturated telomer.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: September 1, 1987
    Assignee: Occidental Chemical Corporation
    Inventor: Johny S. Ng
  • Chlorotrifluoroethylene telomerization process
    Patent number: 4691065
    Abstract: An improved process for preparaing telomers of chlorotrifluoroethylene comprises the solution telomerization reaction of chlorotrifluoroethylene with carbon tetrachloride in the presence of a catalytic amount of cupric chloride (CuCl.sub.2) and an iron reductant. Preferably, the solvent for the system comprises acetonitrile, and the telomerization is carried out under elevated pressure conditions and at a temperature in the range of from about 90.degree. C. to about 150.degree. C. The crude telomer prepared by this process can be fluorinated to produce a stabilized oil or grease.
    Type: Grant
    Filed: November 2, 1983
    Date of Patent: September 1, 1987
    Assignee: Occidental Chemical Corporation
    Inventor: Bobby F. Dannels
  • Process for removing phosphorus from industrial waste water
    Patent number: 4689154
    Abstract: An improved process is described for removing phosphorus from industrial waste water by contacting the waste water with ozone to convert reduced or organic phosphates into ortho-phosphates, and precipitating the soluble ortho-phosphates by treatment with lime. The precipitated material can be filtered, and the filtrate treated with activated carbon to produce an effluent stream having low levels of phosphorus.The process of this invention is particularly effective at low treatment temperatures, enabling efficient treatment of the waste water during periods of cold weather.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: August 25, 1987
    Assignee: Occidental Chemical Corporation
    Inventor: Walter M. Zimberg
  • Graft polymers of polymerizable monomers and olefin polymers
    Patent number: 4661549
    Abstract: Graft polymers are prepared by reacting an ethylenically unsaturated polymerizable monomer with a polymer of an olefin of 2 to about 8 carbon atoms in a process wherein the olefin polymer is substantially insoluble in the monomer but is capable of absorbing the monomer. In a preferred aspect, a vinyl halide polyolefin graft polymer is produced by reacting a solid polyolefin particle with a vinyl halide monomer in which the polyolefin is substantially insoluble, but is capable of absorbing the monomer. The solid particles can be contacted with the monomer in one step or in stages. When the stage-wise reaction is continued until the proportion of polyolefin in the polymer product is about 2 to about 20 weight percent, the resulting product can be formed to a transparent or translucent article.
    Type: Grant
    Filed: October 12, 1983
    Date of Patent: April 28, 1987
    Assignee: Occidental Chemical Corporation
    Inventor: Leigh E. Walker
  • Heat exchange apparatus useful for melting sulfur
    Patent number: 4651817
    Abstract: A steam lance, which is useful to melt solid sulfur in the outlet underneath a sulfur tank car containing molten sulfur, comprises (in operative relationship) tip means for contacting a material to be heated (e.g., solid sulfur); conduit means for conducting heat exchanging fluid to, or to and from, said tip means; and pivot means disposed in an operative relationship therewith for pivotally supporting said conduit means to enable the application of force to said conduit means to urge said tip means against or into said material to be heated.
    Type: Grant
    Filed: February 5, 1982
    Date of Patent: March 24, 1987
    Assignee: Occidental Chemical Agricultural Products, Inc.
    Inventors: Michael N. Dugger, Jack S. Hampton
  • Process for preparing methyl chlorosulfates
    Patent number: 4649209
    Abstract: A process for preparing methyl chlorosulfates by reacting methylene chloride with sulfur trioxide, stabilizing and distilling the reaction mixture, and recovering at least one methyl chlorosulfate as a distillate is disclosed. Preferably, the reaction produces two methyl chlorosulfates, i.e. chloromethyl chlorosulfate and methylene bis-(chlorosulfate), which are separated and recovered by fractional distillation.
    Type: Grant
    Filed: August 5, 1985
    Date of Patent: March 10, 1987
    Assignee: Occidental Chemical Corporation
    Inventor: Emil J. Geering
  • Modified liquid resole phenolic resinous composition for friction materials
    Patent number: 4647631
    Abstract: A resinous composition for friction materials, especially for non-asbestos type friction materials is disclosed. The composition is composed of a phenolic resin modified by the reaction product of an acrylonitrile-butadiene liquid rubber with an epoxy resin, and further modification with a triazine resin. This composition when blended with non-asbestos fibers, such as fiberglass, etc., retains the flexibility desired, provides excellent friction characteristics and a reduced wear rate.
    Type: Grant
    Filed: January 13, 1986
    Date of Patent: March 3, 1987
    Assignee: Sumitomo Durez Company, Ltd.
    Inventors: Kenichi Noguchi, Kazuhisa Hirano
  • Aluminum fluorophosphates made from impure phosphoric acids and conversion thereof to alkalimetal phosphates
    Patent number: 4636372
    Abstract: Alkali metal phosphates and HF can be produced from a substantially calcium-free fluoroaluminum phosphate precipitate (which also contains iron) made by the aging of wet process phosphoric acid containing iron, fluorine and aluminum, preferably phosphoric acid analyzing in the range of about 15%-45 weight percent P.sub.2 O.sub.5, 2-4% Al.sub.2 O.sub.3 and 1-2% fluorine. One process involves digestion of phosphate ore matrix in recycled phosphoric acid, filtration to remove the insoluble residue, precipitation and filtration to remove gypsum, and aging of the product acid to precipitate the aluminum impurity as a fluoroaluminum phosphate compound. The fluoroaluminum phosphate can be decomposed (as by heating at above 195.degree. C.) to produce HF and aluminum phosphate. The aluminum phosphate can be contacted with alkali metal hydroxide under conditions which produce an alkali metal phosphate.
    Type: Grant
    Filed: March 7, 1985
    Date of Patent: January 13, 1987
    Assignee: Occidental Chemical Agricultural Products, Inc.
    Inventors: Elie Chemtob, Gary L. Beer
  • Process for the preparation of .alpha.-.alpha.-.alpha.-trifluoroanisoles
    Patent number: 4620040
    Abstract: Trifluoroanisoles of the formula ##STR1## where m is 1 or 2 and n is 0 to 3, are prepared by reacting hydrogen fluoride with trichloroanisoles of the formula ##STR2## in the vapor phase, in the presence of a fluorinated alumina catalyst whereinX is halogen other than fluorine;R is aryl, preferably 1 to 14 carbon atoms, halogen substituted aryl, halogen, alkyl of 1 to 6 carbon atoms, or alkoxy of 1 to 6 carbon atoms;m is 1 or 2;n is 0 to 3;w is 0 to 2;p is 1 to 3;q is 0 to 2;w+p+q is 3;w' is 1 to 3 and is greater than w;p' is 0 to 2 and is less than p;q' is 0 to 2 and is equal to q; andw'+p'+q' is 3.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: October 28, 1986
    Assignee: Occidental Chemical Corporation
    Inventor: Derek J. Alsop
  • Fire retardant thermoplastic polyester and polyesterether compositions
    Patent number: 4613651
    Abstract: Thermoplastic polyester and polyesterether compositions having improved flame retardance, smoke generation and heat aging, reduced blooming and superior high temperature processability comprise a thermoplastic polyester or polyesterether resin derived from 1,4-butanediol and dimethyl terephthalate, antimony oxide, optionally fiberglass, and a chlorinated bisimide of the formula ##STR1##
    Type: Grant
    Filed: June 3, 1985
    Date of Patent: September 23, 1986
    Assignee: Occidental Chemical Corporation
    Inventor: Ronald I. Markezich