Patents Assigned to Hercules
  • Low toxicity radiation curable resins and coatings made therefrom
    Patent number: 5254603
    Abstract: A radiation curable coating composition comprising reactive monomers, a photoinitiator, between about 4 wt.% to 35 wt.% of a cellulose derivative, preferably nitrocellulose and an unsaturated polyester resin which is the reaction product of glycols and unsaturated dibasic acids. Coatings prepared in accordance with the present invention can be used as overprint varnishes for magazines and other coated papers. These coatings may also be used to provide a protective finish for wood.
    Type: Grant
    Filed: December 24, 1990
    Date of Patent: October 19, 1993
    Assignee: Hercules Incorporated
    Inventor: Steven H. Nahm
  • Organosilicon polymers, and dyes, exhibiting nonlinear optical response
    Patent number: 5254655
    Abstract: Organosilicon polymers, including crosslinked polymers and crosslinkable prepolymers, of cyclic polysiloxanes, organic dyes, and, optionally, polyenes. The dyes include those with delocalized Pi electron systems linking electron donor groups and electron acceptor groups, and with at least two carbon-carbon double bond-containing pendant groups attached to at least two different sites from among the indicated delocalized Pi electron systems, donor groups, and acceptor groups.
    Type: Grant
    Filed: February 5, 1992
    Date of Patent: October 19, 1993
    Assignee: Hercules Incorporated
    Inventors: Wayne M. Gibbons, Robert P. Grasso, Michael K. O'Brien, Paul J. Shannon, Shao-Tang Sun
  • Fluorinated aldoketene dimer structures and their use as combination oil and water resistant sizes for cellulosic materials
    Patent number: 5252754
    Abstract: Aldoketene dimer sizing agents that can efficiently impart both oil and water sizing properties to paper, of an unsaturated .beta.-lactone structure containing terminal perfluoralkyl groups separated from the ketene moiety by at least three carbon atoms, which may be attached to a halogen other than fluorine or an ether, thioether, amide, tertiary amine, ester, or side chain functionality.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: October 12, 1993
    Assignee: Hercules Incorporated
    Inventor: Kyle J. Bottorff
  • Purification of sulfur hexafluoride
    Patent number: 5252259
    Abstract: Impurities such as oxygen and moisture can be removed from sulfur hexafluoride by contacting the impure gas with the reaction product of sulfur hexafluoride and a lithium-substituted macroreticulate polymer.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: October 12, 1993
    Assignee: Hercules Incorporated
    Inventor: Steven J. Hardwick
  • Gas distributing and infrared radiating block assembly
    Patent number: 5249953
    Abstract: A radiant burner assembly for a gas fired infrared burner has a first block of permeable material for transporting and distributing a mixture of combustion gas and air. A second block of material which has properties different from the material of the first block completes transport and distribution of the mixture and provides a combustion zone in which the mixture burns and heats the outer surface of the second block to incandescence for efficient infrared radiation. The pore spaces through which gas flows in the second block are larger than the pores spaces through which gas flows in the first block so that the mixture expands to form a turbulent mixture in the second block. Varying pore size may be provided in each block of material. Ceramic materials are used for withstanding elevated temperatures.
    Type: Grant
    Filed: November 4, 1992
    Date of Patent: October 5, 1993
    Assignees: Hercules Canada, Inc., 285550 British Columbia Ltd., 285562 British Columbia Ltd.
    Inventor: Reinhold C. Roth
  • Organosilicon compositions containing hydrocarbon elastomers
    Patent number: 5242979
    Abstract: This invention is directed to a polymeric composition comprising (a) a continuous phase of a cross-linked organosilicon polymer comprised of alternating (i) polycyclic hydrocarbon residues derived from polycyclic polyenes having at least two non-aromatic, non-conjugated carbon-carbon double bonds in their rings and (ii) residues derived from the group consisting of cyclic polysiloxanes and tetrahedral siloxysilanes, linked through carbon to silicon bonds, and (b) a discontinuous phase of a low molecular weight hydrocarbon elastomer having at least two hydrosilation reactable carbon-carbon double bonds.
    Type: Grant
    Filed: October 5, 1990
    Date of Patent: September 7, 1993
    Assignee: Hercules Incorporated
    Inventors: Paquita E. Barnum, Richard L. Brady
  • Filament wound threaded tube connection
    Patent number: 5233737
    Abstract: A filament wound pipe for conveying fluids, said pipe having a central longitudinal axis which extends along a length of said pipe which includes at least an end thereof that is for connecting said pipe to another body, said pipe comprising a filament wound axial section, two ramp sections and at least one end section wherein said ramp section is between said axial and said end sections along said central longitudinal axis, and wherein said end section is internally threaded; and wherein said filaments extend from said axial section through said ramp section to a first, to a second and to other locations in one of said end sections and wherein from said ramp section to an end of said end section remote from said ramp section inner dimensions increase along said central longitudinal axis.
    Type: Grant
    Filed: October 25, 1991
    Date of Patent: August 10, 1993
    Assignee: Hercules Incorporated
    Inventor: Frederick J. Policelli
  • Process for preparing a sulfonated chitosan
    Patent number: 5229504
    Abstract: There is disclosed a process for preparing a sulfonated chitosan wherein C3/C6-position hydroxyl groups are selectively sulfonated with inexpensive sulfonating agents which comprises dissolving or swelling chitosan in an acetic acid in water, regenerating chitosan with an alkaline aqueous solution, washing the regenerated chitosan with water and then with alcohol, immersing the chitosan in a polar solvent and pressing the solvent out of the same and sulfonating the chitosan with SO.sub.3 -DMF complex or ClHSO.sub.3an -DMF complex in a non-polar solvent. Separation of the product can be easily effected by way of filtration and the like.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: July 20, 1993
    Assignee: DIC-Hercules Chemicals, Inc.
    Inventor: Jisuke Hayashi
  • Polymer precursor for silicon carbide/aluminum nitride ceramics
    Patent number: 5229468
    Abstract: A block copolymer is prepared by reacting an aluminum-nitrogen polymer and a silazane polymer at a temperature not greater than 400.degree. C. Block copolymers containing alkenyl or alkynyl groups can be crosslinked by supplying energy to generate free radicals. An AlN/SiC containing ceramic is formed by pyrolyzing the crosslinked block copolymer in a nonoxidizing atmosphere.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: July 20, 1993
    Assignee: Hercules Incorporated
    Inventor: James A. Jensen
  • Foamed in place igniter and aft-end assembly for rocket motor comprising the same
    Patent number: 5220783
    Abstract: A process of forming an igniter in an aft-end assembly for a solid rocket motor, the assembly having an internal cavity and comprising at least one element selected from the group consisting of a nozzle, a blast tube and an exit cone, which process comprises positioning an ignition package comprising pyrotechnic material and an initiator in the assembly cavity and causing a polymer foam to expand and cure in the assembly cavity and around the ignition package, so as to embed and secure the ignition package, form an aft closure, and for the igniter as an integral portion of the assembly.
    Type: Grant
    Filed: September 20, 1991
    Date of Patent: June 22, 1993
    Assignee: Hercules Incorporated
    Inventors: Charles C. Cherry, Raymond E. Wiechering
  • Adjustable carrier and method for processing a tire in a tire retreading plant
    Patent number: 5221389
    Abstract: A movable, adjustable carrier assembly suitable for transporting a tire through a tire retreading plant along a conveyor track at different heights. The adjustable carrier assembly includes a main bar and a support bar. The support bar self-lockingly engages one of a plurality of notches or slots in the main bar. By reason of the multiplicity of notches, the height of the support bar, and accordingly the height of the tire it is transporting, can be adjusted, thus permitting a tire to be transported throughout a tire retreading plant on a single adjustable carrier, the height of the tire being adjusted as needed at the various operational stations. Also, the same adjustable carrier can be adjusted to accommodate tires of different sizes.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: June 22, 1993
    Assignee: Hercules Tire & Rubber Company
    Inventor: Robert H. Majewski
  • Liquid solder mask composition
    Patent number: 5217847
    Abstract: Disclosed is a UV-curable, aqueous developable liquid solder mask composition comprising (1) 40%-70% of a nonreactive binder that is a film-forming random copolymer of (a) one or more (meth)acrylic alkyl ester monomers, at least one of which is an ester of a 4-12 carbon alkanol, (b) acrylic or methacrylic acid, and optionally (c) styrene or .alpha.-methylstyrene, (2) 20%-40% of one or more (meth)acrylic ester monomers containing two or more ethylenic double bonds, wherein at least one of the monomers has at least four ethylenic double bonds, (3) 1%-5% of a free radical-generating photoinitiator, (4) 5%-15% of a filler, all percentages being by weight based on the nonsolvent components of the composition, and (5) an organic solvent.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: June 8, 1993
    Assignee: Hercules Incorporated
    Inventor: Daniel F. Varnell
  • Preceramic polymers incorporating boron and their application in the sintering of carbide ceramics
    Patent number: 5206327
    Abstract: The present invention relates to preceramic polymers incorporating boron and their application in the sintering of SiC ceramics. The present invention is also directed to a process for preparing a boron-substituted polysilazane which involves preparing a silazane ammonolysis product by reacting ammonia with a halogenated silicon compound selected from the group consisting of RSiX.sub.3, RR'SiX.sub.2, RR'R"SiX, SiX.sub.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: April 27, 1993
    Assignee: Hercules Incorporated
    Inventors: Roger L. K. Matsumoto, Joanne M. Schwark
  • Grignard reagent as activator for polymerization of dicyclopentadiene
    Patent number: 5204420
    Abstract: A Grignard reagent having the formula RMgX where R is a cycloalkyl or cycloalkenyl group and X is Cl, Br or I, is used as the catalyst activator for the metathesis polymerization of dicyclopentadiene and other polycyclic cycloolefins.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: April 20, 1993
    Assignee: Hercules Incorporated
    Inventor: Tim J. Coffy
  • Silicon carbide ceramics containing a dispersed high metal content silicide phase
    Patent number: 5204294
    Abstract: A sintered silicon carbide product having improved fracture toughness contains from 1% to 80% by weight of (a) a uniformly dispersed, nonagglomerated, high metal content silicide of iron, nickel, cobalt or molybdenum in which the metal/silicon ratio is equal to or greater than 1. The silicon carbide starting material can be alpha-phase, beta-phase or a mixture of the two.
    Type: Grant
    Filed: October 21, 1991
    Date of Patent: April 20, 1993
    Assignee: Hercules Incorporated
    Inventor: Roger L. K. Matsumoto
  • Polymerizable nematic monomer compositions
    Patent number: 5202053
    Abstract: This invention is a polymerizable nematic monomer composition comprising (A) 20 to 80 weight % of at least one monomer having the following general formula wherein n is 10, 12 or 14, and (B) 80 to 20 weight % of at least one monomer having the following general formula wherein n is 4, 6 or 8: ##STR1## wherein R is CH.sub.3 or H and Y is covalent bond or --CO.sub.2 --.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: April 13, 1993
    Assignee: Hercules Incorporated
    Inventor: Paul J. Shannon
  • Ribbonizing apparatus for individually heating a plurality of laterally adjacent tows in a fiber placement device
    Patent number: 5200018
    Abstract: A ribbonizing apparatus and method for forming a fiber band from a plurality of fiber tows extending along respective fiber tow pathways. The ribbonizing apparatus includes an assembly for selectively heating at least a respective one of the plurality of fiber tows as the fiber tow extends along the fiber pathways. When not needed, the heat is removed from the fiber tow. A plurality of embodiments for accomplishing the method are contemplated.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: April 6, 1993
    Assignee: Hercules Incorporated
    Inventors: Dee R. Gill, James P. Neilsen, Noel I. Shepherd, William J. Weis, John A. Johnson, Kazutoshi Fujimoto
  • Organosilicon polymers
    Patent number: 5196498
    Abstract: Organosilicon polymers of polycyclic polyenes, cyclic polysiloxanes and/or tetrahedral siloxysilanes, and unsaturated hydrocarbyl group-bearing silicon compounds. The polymers are prepared by reacting the indicated compounds together, or by reacting the hydrocarbyl group-bearing silicon compounds with prepolymers of the polycyclic polyenes and cyclic polysiloxanes and/or tetrahedral siloxysilanes.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: March 23, 1993
    Assignee: Hercules Incorporated
    Inventor: Raymond T. Leibfried, Sr.
  • Tungsten-imido catalysts for ring-opening metathesis polymerization of cycloolefins
    Patent number: 5194534
    Abstract: This invention relates to a two component catalyst system for the polymerization of metathesis polymerizable cycloolefins, comprising(a) a pure tungsten-imido compound (procatalyst) of the formulaW(NR.sup.1)X.sub.4-x (OR.sup.2).sub.x.L.sub.ywherein x=0, 1, 2, 3 or 4; y=0 or 1; R.sup.1 and R.sup.2 are alkyl, phenyl, phenyl-substituted phenyl, phenylalkyl or halogen substituted derivatives of alkyl, phenyl, phenyl-substituted phenyl or phenylalkyl; X=Br or Cl; where alkyl has 1 to 8 carbon atoms, phenyl-substituted phenyl has 12-18 carbon atoms and phenylalkyl has 7 to 20 carbon atoms; L is a donor ligand; and(b) an activator compound selected from organometals and organometal hydrides with tri-n-butyltin hydride and tri-octyltin hydride the most preferred.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: March 16, 1993
    Assignee: Hercules Incorporated
    Inventor: Andrew Bell
  • Fat substitute
    Patent number: 5192575
    Abstract: A fat simulating composition is composed of a substantial portion of elongated, irregularly shaped carbohydrate gel particles having a longest axial dimension of up to 250 microns with a mean volume diameter ranging from about 10 microns to about 100 microns; the particles are in a hydrated state so as to have the substantially smooth organoleptic character of an oil emulsion. This fat simulating product is substituted in foods for all or a portion of the fat and/or oil used in that food product.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: March 9, 1993
    Assignee: Hercules Incorporated
    Inventors: Andrew C. Hoefler, Julia A. Sleap, Jens E. Trudso