Patents Represented by Attorney Benjamin G. Colley
  • Patent number: 4904710
    Abstract: Carbonate polymer compositions are rendered gamma ray resistant by the incorporation of 500 to 50,000 ppm of one or more polyether polyols. Compared to the controls, the compositions of the invention have a reduced yellowing after exposure to cobalt 60 radiation.
    Type: Grant
    Filed: October 31, 1985
    Date of Patent: February 27, 1990
    Assignee: The Dow Chemical Company
    Inventor: Vaughn M. Nace
  • Patent number: 4851144
    Abstract: Lubricant base compositions for compression refrigeration are composed of 95 to 5% by weight of polyether polyols having a number average molecular weight from about 400 to about 5000 and 5 to 95% of esters made from polyhydric alcohols with alkanoic acids or esters made from alkanedioic acids with alkanols. A refrigeration fluid is made from the base composition with the addition of selected hydrochlorofluorocarbons and hydrofluorocarbons so that the base composition is miscible with the refrigerant in the range from -20.degree. C. to greater than 65.degree. C.
    Type: Grant
    Filed: January 10, 1989
    Date of Patent: July 25, 1989
    Assignee: The Dow Chemical Company
    Inventors: Philip W. McGraw, Eldon L. Ward
  • Patent number: 4851483
    Abstract: Vinyl ester resins of substituted epoxidized hydroxystyrylaza compounds are disclosed. These vinyl esters may be combined with various reactive monomers, prepolymers or polymers and cured to give a combination of high mechanical strength and glass transition temperature.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: July 25, 1989
    Assignee: The Dow Chemical Company
    Inventors: Robert E. Hefner, Jr., John W. Robinson
  • Patent number: 4849485
    Abstract: Heterocyclic styryl compounds are prepared by condensing nitrogen heterocyclic compounds such as trimethyl pyridine with dialdehydes and heterocyclic aldehydes such as furfural. These can be further reacted and chain extended with bismaleimides or p olymaleimides. The compounds and their reaction products are useful to make heat resistant composites with various fibers such as graphite fibers.
    Type: Grant
    Filed: October 14, 1987
    Date of Patent: July 18, 1989
    Assignee: The Dow Chemical Company
    Inventor: Paul M. Puckett
  • Patent number: 4847352
    Abstract: Polycarbonate prepolymers are produced by adding phosgene, one or more dihydric phenols, a halogenated organic solvent, and an aqueous caustic solution together with mixing in motionless mixers to form fine dispersions of partially phosgenated phenols, allowing for interfacial reactions to occur in residence time sections and repeating the steps after the addition of caustic to form high molecular weight prepolymers. These prepolymers are then polymerized with amines to form high molecular weight polycarbonates.
    Type: Grant
    Filed: August 26, 1987
    Date of Patent: July 11, 1989
    Assignee: The Dow Chemical Company
    Inventors: John W. Weston, Ronald R. Smith, II, Jose L. Aguilar
  • Patent number: 4832937
    Abstract: Electrochemical regeneration in an electrochemical cell of spent scrubbing solutions containing polvalent metal chelates is accomplished without substantial degradation of the chelate by controlling the anolyte pH and maintaining the anode potential of the cell above the oxidation potential of the polyvalent metal chelate but below the oxidation potential of the chelate portion of the polyvalent metal chelate.
    Type: Grant
    Filed: September 28, 1988
    Date of Patent: May 23, 1989
    Assignee: The Dow Chemical Company
    Inventors: John M. McIntyre, Bruce R. Smith
  • Patent number: 4830838
    Abstract: Fluid streams containing hydrogen sulfide from a steam tubine or from a sour gas stream are contacted with an aqueous solution of a polyvalent metal chelate and a bisulfite whereby the hydrogen sulfide is converted to free sulfur and then to soluble sulfur compounds. The metal chelate is reduced to a lower oxidation state metal chelate and reduced metal chelate is subsequently oxidized with air back to the higher oxidation state and reused. The bisulfite is formed by combustion of a portion of the fluid stream and subsequent absorption of the sulfur dioxide formed thereby in a two-stage countercurrent scrubber operating at conditions favorable for high bisulfite and low sulfite formation and selective away from carbon dioxide absorption.
    Type: Grant
    Filed: November 1, 1988
    Date of Patent: May 16, 1989
    Assignee: The Dow Chemical Company
    Inventors: Van A. Kent, William R. Behr, Larry H. Kirby
  • Patent number: 4789730
    Abstract: The present invention is directed to a continuous process which removes the 1 to 3% cyclic oligomers formed in the polycarbonate process and after hydrolysis of the oligomers recycles the resulting monomer for use in the reaction forming the polycarbonates. To remove the cyclic oligomers to a level so as to produce an improved polycarbonate product and to recover the oligomers in an economical manner for recycling in a continuous process, the selection of a solvent is unique and essential to achieve the continuous process. The solvent for the cyclic oligomers must be immiscible with water, must not react with an alkali and have a cohesive energy density of less than 90.
    Type: Grant
    Filed: June 5, 1986
    Date of Patent: December 6, 1988
    Assignee: The Dow Chemical Company
    Inventor: Duane B. Priddy
  • Patent number: 4657949
    Abstract: Carbonate polymer compositions are rendered gamma ray resistant by the incorporation of 5 to 20,000 ppm of one or more sorbate compounds. The compositions of the invention have a reduced yellowing after exposure to cobalt 60 radiation. Examples of useful sorbate compounds are sorbic acid, sorbic acid amides, esters and the like. The addition of hindered phenolic compounds renders the sorbate compounds more effective.
    Type: Grant
    Filed: December 5, 1985
    Date of Patent: April 14, 1987
    Assignee: The Dow Chemical Company
    Inventor: Vaughn M. Nace
  • Patent number: 4643886
    Abstract: A method for removing hydrogen sulfide from a gaseous stream by contacting the gaseous stream with a polyvalent metal chelate present in an aqueous alkaline scrubbing solution including the regeneration of the polyvalent metal chelate in an electrolytic cell and automatic control of the pH of said aqueous alkaline scrubbing solution at about 7 to 9.
    Type: Grant
    Filed: December 6, 1985
    Date of Patent: February 17, 1987
    Assignee: The Dow Chemical Company
    Inventors: Dane Chang, Stephen A. Bedell
  • Patent number: 4643839
    Abstract: The reaction product of phosphorous acid, formaldehyde, and monomeric or polymeric alkoxysilanes having one or more aminoalkylene groups are useful as gelation inhibitors for aqueous glycol solutions.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: February 17, 1987
    Assignee: The Dow Chemical Company
    Inventors: Richard A. Pierce, David A. Wilson
  • Patent number: 4640957
    Abstract: Polyimido-ester compounds having the formula RO-C(O)-R.sub.1 -C(O)-OR are disclosed wherein R is an alkylene N-dicarboximido radical containing cycloolefinic unsaturation and R.sub.1 is the divalent residue of an unsaturated polycarboxylic acid such as fumaric, itaconic, aconitic, mesaconic, or glutaconic acid. These compounds are blended with unsaturated resins such as unsaturated polyester resin or vinyl ester resin, and polymerizable unsaturated monomers such as styrene to provide thermosettable resin compositions which can be cured to provide castings or laminates with improved resistance to thermal aging.
    Type: Grant
    Filed: June 13, 1985
    Date of Patent: February 3, 1987
    Assignee: The Dow Chemical Company
    Inventors: Robert E. Hefner, Jr., Douglas L. Hunter
  • Patent number: 4629608
    Abstract: Process for removing H.sub.2 S from the exhaust steam in a geothermal power plant wherein the H.sub.2 S containing steam is contacted with an aqueous solution containing a ferric chelate and a cationic polymeric catalyst such as poly(dimethyldiallyl ammonium chloride). The conversion of H.sub.2 S to sulfur is accelerated by the use of a small amount of the catalyst.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: December 16, 1986
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Lampton, Jr., Thomas M. Hopkins, II
  • Patent number: 4600767
    Abstract: Thermostable hydroxystyrylaza compounds are prepared by reacting methylated pyridines and/or pyrazines with one or more monohydroxy aromatic aldehydes having the ortho and para positions to the hydroxy group block with groups inert to condensation reactions. These compounds are useful to make unsaturated derivatives which can cure into high temperature resistant polymers and/or laminates without giving off condensation products.
    Type: Grant
    Filed: August 16, 1985
    Date of Patent: July 15, 1986
    Assignee: The Dow Chemical Company
    Inventors: Tim R. Diephouse, Randy J. LaTulip, John W. Robinson, Gary R. Gantt
  • Patent number: 4596849
    Abstract: This invention relates to a corrosion inhibiting composition for ferrous metals and its alloys in gas conditioning service using aqueous monoethanolamine to scrub carbon dioxide containing oxygen. The corrosion inhibiting composition includes a thiourea-amine-formaldehyde based polymer and, in the preferred embodiment, also includes a cupric ion producing material.
    Type: Grant
    Filed: October 29, 1984
    Date of Patent: June 24, 1986
    Assignee: The Dow Chemical Company
    Inventors: Edwin R. Henson, Joel G. Courtwright, Tipton T. Masterson
  • Patent number: 4585630
    Abstract: Hydrogen sulfide is removed from gas streams containing it with or without carbon dioxide by contacting the gas feed stream with an aqueous liquid containing sulfide and bisulfide ions and having a pH in the range from 9 to 12 to remove a minor portion of the hydrogen sulfide and then removing the remainder with an aqueous liquid containing sulfide and bisulfide ions having a higher pH in the range from 11 to 13.5.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: April 29, 1986
    Assignee: The Dow Chemical Company
    Inventors: Van A. Kent, Roberto A. Abib, Larry H. Kirby
  • Patent number: 4568418
    Abstract: Thermoplastic polymer solutions in organic solvents are converted to granules of relatively uniform sizes and a narrow distribution range by passing the polymer solution through a jet nozzle to form a high velocity stream, injecting super heated steam into the high velocity stream to form a suspension of fine polymer particulates in a gas stream, passing the particulates into a heated agglomeration tube having a series of adjoining circular turns of at least 180.degree. wherein the particulates are substantially completely agglomerated into granules and the granules are recovered from the gas stream.
    Type: Grant
    Filed: November 22, 1982
    Date of Patent: February 4, 1986
    Assignee: The Dow Chemical Company
    Inventors: Lee E. Walko, Stephen B. Wallace, Norman Swanson, Roy M. Cook
  • Patent number: 4087355
    Abstract: A process for the separation of aromatic hydrocarbon compounds from mixtures thereof with non-aromatic hydrocarbon compounds wherein the mixtures are contacted with a cyanoethylated alkoxylated solvent to form an extract containing the aromatics and separating the extract from the non-aromatic compounds. The modified alkoxylated solvent has the formulaTZ--CH.sub.2 --[C(R.sub.1 R.sub.2)].sub.a [CH.sub.2 ].sub.b CH.sub.2 --ZTwherein T is cyanoethyl or hydrogen; Z is the divalent group represented by --(CH.sub.2).sub.y O--(C.sub.n H.sub.2n --O).sub.x wherein n is a whole number from 2-4; x is a number having an average value from 3-40; y is 0 or 1; a is 1-4; b is 0-3; R.sub.1 is hydrogen, --CH.sub.3, --C.sub.2 H.sub.5 or --ZT; R.sub.2 is hydrogen or --ZT; wherein at least one of R.sub.1 or R.sub.2 is --ZT and at least one T group is cyanoethyl. Examples of such solvents are the mono, di and tri cyanoethylated ethylene oxide adducts of glycerine, trimethylol propane and 1,2,6-hexane triol.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: May 2, 1978
    Assignee: The Dow Chemical Company
    Inventors: Clyde Edward Baxter, Arthur Emilio Gurgiolo
  • Patent number: 4086159
    Abstract: A process for the separation of aromatic hydrocarbon compounds from mixtures thereof with non-aromatic hydrocarbon compounds wherein the mixtures are contacted with an ethoxylated alkane polyol solvent having a number average molecular weight range from about 250 to about 1100 to form an extract containing the aromatics and separating the extract from the non-aromatic compounds.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: April 25, 1978
    Assignee: The Dow Chemical Company
    Inventors: Clyde Edward Baxter, Arthur Emilio Gurgiolo
  • Patent number: 4079029
    Abstract: Water swellable absorbent articles, made from latexes having a copolymerized crosslinker, together with methods for their preparation, and a composition containing a copolymerized crosslinker useful to make said articles are disclosed. The articles are crosslinked by heating and/or removing substantially all of the water from the precursor composition.The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats and the like.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: March 14, 1978
    Assignee: The Dow Chemical Company
    Inventor: James Richard Gross