Patents Assigned to E. I. Du Pont de Nemours and Co.
  • Dehydrohalogenation process
    Patent number: 4418232
    Abstract: Improvement in the catalytic dehydrohalogenation of a halogenated hydrocarbon to an ethylenically unsaturated product with aqueous alkali in a series of reactors in a cascade arrangement, wherein the fresh alkali feed is relocated from the first reactor to a reactor subsequent to the first, and partly spent alkali solution from the last reactor is recirculated to the first reactor, while the ethylenically unsaturated product is recovered from the effluent from the last reactor, and waste brine is removed from the effluent from the reactor immediately preceding that to which fresh alkali is fed. In this manner, the amount of both the alkali and the catalyst can be reduced, and the conversion is increased. Dehydrochlorination of 3,4-dichlorobutene-1 gives chloroprene, which is a valuable monomer for making synthetic elastomers.
    Type: Grant
    Filed: November 29, 1982
    Date of Patent: November 29, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Louis J. Maurin, III
  • Terminal for establishing electrical contact with a shielded cable
    Patent number: 4416501
    Abstract: A terminal for establishing electrical contact with the conductive shield of a cable having an aluminized Mylar.RTM. layer surrounded by an outer braid and then a layer of insulation forming a jacket. A ferrule is inserted between the outer braid and the Mylar.RTM. and is locked in place by an insulator displacement device which penetrates the insulation jacket to establish electrical contact with the shield.
    Type: Grant
    Filed: November 23, 1981
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: David F. Fusselman, Timothy A. Lemke
  • Toluic acid
    Patent number: 4416801
    Abstract: Process for oxidatively carbonylating toluene to toluic acid, at least 50 mol % of the toluic acid being the p-isomer, said process comprising contacting and reacting, at 110.degree.-250.degree. C., at a pressure of at least 500 psi (3.45 MPa), toluene, carbon monoxide, oxygen and the catalyst ingredients consisting essentially of(a) a compound of rhodium, iridium, ruthenium, platinum, palladium or osmium;(b) a sulfur oxy-acid or a Group Ia or IIa metal salt of a sulfur oxy-acid; and(c) an acid or acid mixture having a Hammett acidity value (--H.sub.o) of greater than 7.0,said catalyst ingredients containing 0.5-30 mol % of (a) and 70-99.5 mol % of (b+c), with the molar ratios of (b/a) and (c/a) each being at least 2, and recovering toluic acid.
    Type: Grant
    Filed: August 19, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Francis J. Waller
  • Radiation-sensitive polyimide precursor composition derived from a diaryl fluoro compound
    Patent number: 4416973
    Abstract: A radiation-sensitive polyimide precursor composition comprises a polymer of the formula ##STR1## wherein n is a positive integer corresponding to the number of units in the polymer and is sufficiently large to provide the polymer with a number average molecular weight of about 1500-15,000 as determined by vapor pressure osmometry, and wherein for any particular unit in the polymer:.fwdarw.denotes isomerism; R.sup.1 is a divalent aromatic, aliphatic or cycloaliphatic radical containing at least 2 carbon atoms; R.sup.2 and R.sup.3 are selected from the group consisting of a hydrogen radical and any organic radical containing a photopolymerizable olefinic double bond; and R.sup.4 and R.sup.5 are selected from the group consisting of perfluoro and perhalofluoro aliphatic hydrocarbons having 1 to 8 carbons.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: David L. Goff
  • Living polymers and process for their preparation
    Patent number: 4417034
    Abstract: "Living" polymers and their preparation from acrylic-type or maleimide monomers and organosilicon, -tin or -germanium initiators.
    Type: Grant
    Filed: June 17, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Owen W. Webster
  • Preparation of zerovalent nickel complexes
    Patent number: 4416825
    Abstract: An improved, continuous process for the preparation of hydrocyanation catalysts comprising zerovalent nickel complexes with organophosphorus compounds (ligands) by controlling the temperature of the reaction relative to the amount of ligand and conducting the reaction in the presence of a chlorine ion and organic nitrile such as adiponitrile.
    Type: Grant
    Filed: February 23, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: John J. Ostermaier
  • Benzothiazoline derivatives as silver halide antifoggants
    Patent number: 4416981
    Abstract: Substituted benzothiazolines are used as antifoggants in high speed silver halide emulsions.
    Type: Grant
    Filed: April 29, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Joseph D. Overman
  • Preparation of a printing master by toning a photopolymer film with magnetic toner
    Patent number: 4416968
    Abstract: A dry-printing process which employs a photopolymer film and two toners, one for generating a master and a second for image transfer.
    Type: Grant
    Filed: September 9, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Robert P. Held
  • Laminates of lamellar articles and polyolefins
    Patent number: 4416942
    Abstract: A laminate of a first layer of a lamellar heterogeneous blend of a polyolefin and a condensation polymer incompatible with the polyolefin, and a second layer of a polyolefin, said layers being melt bonded together.
    Type: Grant
    Filed: May 21, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Robert C. DiLuccio
  • Crosslinked ethylene/vinyl acetate copolymer film and process for treating same
    Patent number: 4416749
    Abstract: A surface treatment for ethylene/vinyl acetate copolymer film resulting in an elastomeric, heat sealable film which retains its transparency after release from 200 percent elongation. The treatment comprises irradiation and controlled surface hydrolysis and, optionally, subsequent attachment of mineral particulates to the surface of the film with or without the use of coupling agents.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Tibor G. Mahr, Pallatheri M. Subramanian
  • Recovery of triarylboranes by forming boron-containing metal compounds
    Patent number: 4416824
    Abstract: A process for recovery of normally soluble triarylboranes in organonitriles by forming novel boron containing metal compounds, e.g., bis(triphenylborane-isocyano-N)-bis(adiponitrile)nickel (II).
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Ronald A. Reimer, Gerald T. Stowe
  • Bulked extensible weft yarn suitable for use as tire cords
    Patent number: 4416935
    Abstract: A bulked extensible yarn of entangled convoluted undrawn synthetic continuous nylon filaments having a plurality of crunodal filament loops randomly spaced along its surface and a greige break elongation of at least 150% performs effectively as an extensible weft yarn in tire cord fabrics for single ply radial tires.
    Type: Grant
    Filed: December 11, 1981
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Laurence N. Bascom, Peter S. K. Leung
  • Alumina coated TiO.sub.2
    Patent number: 4416699
    Abstract: A chalk-fade resistant TiO.sub.2 pigment exhibiting excellent gloss and dispersion that is comprised of TiO.sub.2 particles with a composite coating of dense alumina and boehmite alumina totaling 2-6% by weight alumina based on the TiO.sub.2 and a process for the preparation of such TiO.sub.2 pigment.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Howard W. Jacobson
  • Additive for coating compositions of silica and a fluorinated ethylene oxide polymer
    Patent number: 4416941
    Abstract: A rheology control additive of(1) colloidal silica and(2) a nonionic fluorocarbon polymer having ethylene oxide linkages and a weight average molecular weight of about 5,000-50,000 and contains about 2-25% by weight of fluorine; high solids coating compositions containing the additive have excellent rheology control and can be used as extension finishes on automobiles and trucks.
    Type: Grant
    Filed: July 30, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Robert J. Barsotti
  • Inorganic films with poly(vinyl alcohol)
    Patent number: 4416938
    Abstract: A substantially continuous, gas-impermeable, film is disclosed including a combination of metal orthophosphate and dialdehyde-treated poly(vinyl alcohol). Barrier properties of a laminate utilizing the film are greatly improved by a heat treatment.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: November 22, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Vernon C. Haskell
  • Process for esterifying fluorinated carboxylic acid polymer
    Patent number: 4415679
    Abstract: A process for preparing a fluorinated polymer having carboxylic ester groups from a corresponding polymer having carboxylic acid groups is disclosed, wherein the polymer having carboxylic acid groups is treated with a selected ortho ester, acetal, ketal, borate ester or sulfite ester. The process is useful for assuring that all of the carboxylate groups of a polymer are in the ester form before an extrusion or lamination procedure, both of which are performed with heat and pressure, so as to preclude decarboxylation of free carboxylic acid groups during such procedure.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: November 15, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Walther G. Grot
  • Certain tetrahydropyridine intermediates
    Patent number: 4415736
    Abstract: Process for preparing analgesic and narcotic antagonistic isoquinolines comprising:(a) contacting and reacting a lithiated anisole or alkyl phenyl ether, optionally substituted at the 3-position to the lithium atom, with a 4-piperidone to yield a 4-aryl-4-piperidinol;(b) dehydrating the piperidinol to a 4-aryl-1,2,3,6-tetrahydropyridine;(c) metalating and acylating the 1,2,3,6-tetrahydropyridine to yield a 1-(4-aryl-1,2,3,4-tetrahydropyrid-4-yl)-4-hydroxy-1-butanone;(d) reducing the ketone moiety of the butanone to yield a 5-aryl-7-oxa-2-azabicyclo[3.2.1]-octane-6-propanol;(e) converting the alcohol moiety of the propanol to L to yield a 5-aryl-6-[3-(L)propyl]-7-oxa-2-azabicyclo[3.2.1]octane in which L is a leaving group selected from the group consisting of -Cl, -Br, -I, p-MeC.sub.6 H.sub.4 SO.sub.3 - and MeSO.sub.3 -.
    Type: Grant
    Filed: December 28, 1981
    Date of Patent: November 15, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Engelbert Ciganek, Ashokkumar B. Shenvi
  • Automatic toning apparatus having a vertically reciprocating hopper
    Patent number: 4414916
    Abstract: An apparatus for applying particulate toner to an image-defining tacky surface upon a photo-element includes a hopper for receiving a particulate toner therein, the hopper being disposed above a transport path along which the photo-element is conveyed. The hopper has a slot extending substantially transversely to and communicating with the transport path. The apparatus is characterized by a reciprocating device for vertically moving the hopper in a reciprocating fashion toward and away from the transport path to impart vibrational energy to the toner to fluidize the same and cause the toner to flow through the slot to form a toner pool, from which pool toner is depositable on a photo-element being transported therebeneath. A toning pad attached to the hopper pats into the photo-element toner that has been deposited from the pool onto the photo-element.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: November 15, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Jose V. Martin
  • Aqueous processable, positive-working photopolymer compositions
    Patent number: 4415652
    Abstract: Three-component aqueous processable, positive-working photopolymer compositions comprising (i) an unsaturated polymer comprising (a) about 20 to 1000 milliequivalents of reactive unsaturated carbon to carbon groups per 100 g of polyene and (b) about 10 to 50 mol percent of N-alkenylmaleimide units; (ii) a reactive mercapto acid and (iii) a radiation-sensitive, radical-generating initiator; substrates coated with such compositions; and a photoimaging process.
    Type: Grant
    Filed: July 27, 1982
    Date of Patent: November 15, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Stephen Proskow
  • Process for preparing aniline
    Patent number: 4415754
    Abstract: Aniline can be prepared by catalytic hydrogenation of nitrobenzene containing polynitrophenol impurities. The polynitrophenol impurities are converted to tars, and can be separated and disposed of.
    Type: Grant
    Filed: January 17, 1983
    Date of Patent: November 15, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Frederick R. Lawrence