Patents Assigned to Hercules
  • Patent number: 5025045
    Abstract: Damage tolerant composites comprising high strength filaments in the form of bundles or tows of continuous fiber and a tough phase separated, crosslinked epoxy resin matrix are disclosed. The crosslinked epoxy resin matrix comprises infusible particles that reside primarily between plies of the composite and critically have a median particle size between 10-75 microns. Prepregs for making the damage tolerant composites and methods of making such prepregs and the epoxy resin compositions thereof are also disclosed. The epoxy resin compositions comprise the infusible particles which become segregated as to size on a surface layer of the prepreg during the process of combining the high strength filaments of the prepreg and the resin containing the epoxy resin composition. Alternatively, the infusible particles may be disposed directly on the epoxy resin surface of the prepreg.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: June 18, 1991
    Assignee: Hercules Incorporated
    Inventors: Irena Gawin, Brian J. Swetlin
  • Patent number: 5024701
    Abstract: Disclosed are improved denture adhesive compositions containing a hydrophobically modified water-soluble polymer alone or admixed with an alkali metal salt of carboxymethyl cellulose having a D.S. of at least 0.3. Hydrophobically modified hydroxyalkyl celluloses and copolymers of ethylene oxide and long chain epoxyalkanes are preferred as the water-soluble polymer.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: June 18, 1991
    Assignee: Hercules Incorporated
    Inventor: Armand J. Desmarais
  • Patent number: 5025048
    Abstract: A composition comprising (A) (i) a crosslinked organosilicon polymer or crosslinkable organosilicon prepolymer comprising alternating (a) cyclic polysiloxane or tetrahedral siloxysilane residues and (b) polycyclic hydrocarbon residues derived from polycyclic polyenes having at least two carbon-carbon double bonds in their rings linked through carbon to silicon bonds, wherein at least one of the cyclic polysiloxanes or tetrahedral siloxysilanes (a) or the polycyclic polyenes (b) used to form the polymer or prepolymer has more than two reactive sites; or (ii) a crosslinked or crosslinkable linear poly(organohydrosiloxane) polymer having a least 30% of its .tbd.SiH groups reacted to hydrocarbon residues derived from polycyclic polyenes having at least two carbon-carbon double bonds in their rings; and (B) as an antioxidant, a compound comprised of at least one hindered phenol and at least one hindered amine; and the process of making the same, are disclosed.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: June 18, 1991
    Assignee: Hercules Incorporated
    Inventor: Julia S. Burnier
  • Patent number: 5022845
    Abstract: A segmented mandrel is adapted for use in fabricating large diameter, light weight articles (such as aircraft component structures) made of thermosetting composite materials by placing fiber on the external surface of the mandrel followed by autoclave curing of the composite materials. The segmented mandrel is composed of a center shaft extending lengthwise through the mandrel, four mandrel segments mating together along a seam between their respective adjacent edges, T-stiffeners for fastening the mandrel segments together, and bulkheads rigidly mounted around the shaft and connected to the stiffeners. This segmented mandrel is reusable, is easily assembled and disassembled, and has a system that creates a vacuum seal between mandrel sections while at the same time retains the functions of support and alignment of the mandrel segments carrying the parts being cured.
    Type: Grant
    Filed: April 25, 1989
    Date of Patent: June 11, 1991
    Assignee: Hercules Incorporated
    Inventors: Sandra M. Charlson, Steven J. Kotula, Michael R. McCloy
  • Patent number: 5023230
    Abstract: Disclosed is a method of preparing a superconductor wherein a precursor oxide mixture is dispersed in an appropriate polymer matrix and shaped into a predetermined form following which the matrix and oxide precursor are respectively carbonized and sintered simultaneously. An alternate method is to separately prepare a superconducting material from the precursor oxide mixture, grind the superconducting material and add it to a solution containing polyacrylonitrile, shape into a predetermined form, following which the superconducting material and matrix are, respectively, carbonized and then annealed.
    Type: Grant
    Filed: July 7, 1989
    Date of Patent: June 11, 1991
    Assignee: Hercules Incorporated
    Inventor: Huai N. Cheng
  • Patent number: 5023214
    Abstract: Disclosed is a sintered ceramic product comprising (a) 20-98 percent by weight silicon nitride, (b) 1-80 percent by weight of a silicide of iron, cobalt or nickel and (c) 0.02-20 parts by weight of at least one oxide, nitride, or silicate of an element of IUPAC groups 2, 3, 4, 13 or the lanthanide series. A method for making such a product is also disclosed.
    Type: Grant
    Filed: April 11, 1989
    Date of Patent: June 11, 1991
    Assignee: Hercules Incorporated
    Inventors: Roger L. K. Matsumoto, Allan B. Rosenthal
  • Patent number: 5022324
    Abstract: A device for ignition of a pyrotechnic material, comprising:(a) piezoelectric means for providing a high voltage electrical pulse in response to mechanical energy;(b) means for emitting a flash of light in response to the high voltage pulse; and(c) a solid state laser capable of emitting a light beam sufficient to ignite a pyrotechnic material in response to said flash of light;and a process of igniting a pyrotechnic device using the same, are disclosed.
    Type: Grant
    Filed: June 6, 1989
    Date of Patent: June 11, 1991
    Assignee: Hercules Incorporated
    Inventor: John H. Rice, Jr.
  • Patent number: 5021548
    Abstract: The color stability of rosin esters is improved by carrying out the esterification reaction in the presence of 0.05% to 5% sodium hydroxymethane sulfonate (SHS). The color stability of polymerized rosin is improved by heating at a temperature of 250.degree.-290.degree. C. in the presence of SHS.
    Type: Grant
    Filed: January 22, 1990
    Date of Patent: June 4, 1991
    Assignee: Hercules Incorporated
    Inventor: James Minn
  • Patent number: 5021533
    Abstract: A composition that comprises a poly(thio)ureasilazane having at least one alkenyl or alkynyl group and a free radical generator can be crosslinked by an energy input provided in the form of heat, ultraviolet radiation, or an electron beam. The crosslinked poly(thio)ureasilazane compositions can be pyrolyzed to form silicon nitride-containing ceramics.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: June 4, 1991
    Assignee: Hercules Incorporated
    Inventor: Joanne M. Schwark
  • Patent number: 5019620
    Abstract: An elastic crosslinked metathesis polymer composition is disclosed comprised of a copolymer of a norbornene-type compound which metathesis polymerizes to a linear polymer and a norbornene-type compound having a second double bond of similar reactivity which forms a crosslinked polymer, and a hydrocarbon-based extending oil. Norbornene and dicyclopentadiene are typical comonomers. Polymerization is carried out by a RIM or resin injection molding process.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: May 28, 1991
    Assignee: Hercules Incorporated
    Inventors: Zenichiro Endo, Shigeyoshi Hara
  • Patent number: 5019544
    Abstract: This invention is a process for preparing a polymer which comprises contacting pure dicyclopentadiene with a pure tungsten catalyst complex, such as WCl.sub.3 (2,6-diisopropylphenoxy).sub.3, when tributyl tin hydride or triphenyl tin hydride is used as the activator for the polymerization. This process affords a method of polymerization of dicyclopentadiene in which the mixture gels slowly without the use of a rate moderator at 80.degree. C. (in from about 15 seconds to as much as two minutes or more) and furthermore cures quite slowly (in about 3-6 minutes). This delay makes these compositions particularly applicable to reaction injection molding processes. Moreover, both the tungsten complexes and the tin activator compounds employed in this invention are relatively insensitive to oxygen and water.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: May 28, 1991
    Assignee: Hercules Incorporated
    Inventor: Andrew Bell
  • Patent number: 5016531
    Abstract: A rotary printing press is used for printing standard pages and for double truck printing of the centerfold page. This is accomplished by mounting side by side printing plates to locking devices in the rotary printing press. The printing plates are positioned by two registrations which are selectively movable toward and away from each other to one of at least two predetermined fixed positions. In one of the fixed positions, the standard printing takes place, and in the other fixed position, the printing press is used for double truck printing.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: May 21, 1991
    Assignee: Hercules, Incorporated
    Inventor: Richard B. Schroeder
  • Patent number: 5017647
    Abstract: A pigmented polymeric composition of matter is provided which comprises units derived from ring-opening metathesis catalyst polymerization of a norbornene-type monomer or mixtures of norbornene-type monomers, and from about 0.05 to about 25 parts by weight, per 100 parts norbornene-type monomer, of carbon black which is substantially free of oxygen.
    Type: Grant
    Filed: June 5, 1990
    Date of Patent: May 21, 1991
    Assignee: Hercules Incorporated
    Inventors: Alvin L. Dougal, Jr., Shigeyoshi Hara
  • Patent number: 5015705
    Abstract: A process for preparing molded objects wherein a liquid reaction mass comprised of a metathesis polymerizable cycloolefin, a metathesis polymerization catalyst, a catalyst activator and a reaction rate moderator are charged to a mold wherein polymerization will take place, the improvement wherein said catalyst activator comprises a dialkylzinc compound. Significantly increased gel and cure times are obtained with the dialkylzinc compounds as compared to the use of aluminum alkyl activator compounds. The gel and cure times may be further controlled by the addition of a phenolic compound to the tungsten or molybdenum compound or by the addition of a Lewis base.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: May 14, 1991
    Assignee: Hercules Incorporated
    Inventor: Andrew Bell
  • Patent number: 5015710
    Abstract: A process is disclosed for preparing a blend of a metathesis polymer and a radical polymer wherein a norbornene polymer is metathesis polymerized in the presence of a vinyl compound having two double bonds in conjugated relationship. Also included in the system is a compound capable of being reduced to a radical by the reduced valence transition metal element which serves as the catalyst of the metathesis polymerization. Examples of such compounds are specific chlorinated organic and chlorinated inorganic compounds.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: May 14, 1991
    Assignee: Hercules Incorporated
    Inventors: Zenichiro Endo, Shigeyoshi Hara
  • Patent number: 5012738
    Abstract: A locking device for clamping plates, such as printing plates, in place includes a housing. A jaw is in the housing with a plurality of sets of clamp members mounted in the jaw. Each of the clamp members has rounded clamp surfaces. Spacers separate the sets of clamp members from each other. A fixed stop member is located at one end of the jaw and an actuating member is movably mounted at the other end of the jaw. When the actuating member is manipulated to move further into the jaw the spacers press against the clamp members to displace a clamp member of each set into its clamping or locking position with the plate clamped between the inside jaw and a wall of the housing.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: May 7, 1991
    Assignee: Hercules, Incorporated
    Inventor: William Bloothoofd
  • Patent number: 5013775
    Abstract: A novel paper sizing composition comprising a ketene dimer and a hydrophilic vinyl polymer containing an alkylmercaptan having 6-22 carbon atoms. The composition has excellent storage and mechanical stability and sizing effect.
    Type: Grant
    Filed: April 27, 1989
    Date of Patent: May 7, 1991
    Assignee: DIC-Hercules Chemicals, Inc.
    Inventors: Hideo Oikawa, Masatomi Ogawa, Kiyoshi Iwai, Mayumi Narushima
  • Patent number: 5013809
    Abstract: Organosilicon prepolymer compositions which are the reaction products of (a) at least one of cyclic polysiloxanes or tetrahedral siloxysilanes containing at least two .tbd.SiH groups and (b) polycyclic polyenes having at least two non-aromatic, non-conjugated carbon-carbon double bonds in their rings, wherein the total ratio of the non-aromatic, non-conjugated carbon-carbon double bonds in the rings of (b) to .tbd.SiH groups in (a) in greater than 1.8:1 and either the .tbd.SiH containing compounds (a) or the polycyclic polyenes (b) have more than two reactive sites. The organosilicon compositions are blended with (c) at least one of additional cyclic polysiloxanes, additional tetrahedral siloxysilanes or linear, short chain .tbd.SiH terminated polysiloxanes to make fluid hydrosilation compositions. These storable blends are polymerized to thermally stable thermoset polymers.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: May 7, 1991
    Assignee: Hercules Incorporated
    Inventor: Raymond T. Leibfried, Sr.
  • Patent number: 5011698
    Abstract: A soft, flexible, microporous film is provided having high tensile strength and good air and water vapor transmission rates therethrough while being substantially impenetrable to liquid water. This film is prepared by stretching a casting of a composition of a polyolefin and high levels of CaCO.sub.3 or glass beads and calcium stearate in two directions from 1.5-7 times in each direction to produce a film having a Gurley porosity of from 0.1 to 85 seconds. This film is especially useful for disposable items such as feminine panty liners, diapers, bed sheets, and hospital gowns. When glass beads are substituted for the CaCO.sub.3, the film is useful for battery separators.
    Type: Grant
    Filed: November 5, 1990
    Date of Patent: April 30, 1991
    Assignee: Hercules Incorporated
    Inventors: Mitchell K. Antoon, Jr., David J. Hill
  • Patent number: 5008360
    Abstract: This invention is directed to a prepreg which comprises fiber reinforcement impregnated with the partial hydrosilation reaction product of:(a) at least one polyene having at least two non-aromatic carbon-carbon double bonds highly reactive in hydrosilation, the carbon-carbon double bonds being either in an alpha, beta or gamma position on a linear carbon moiety, next to two bridgehead positions in a strained polycyclic aliphatic ring structure, or in a cyclobutene ring;(b) at least one polycyclic polyene having at least two chemically distinguishable non-aromatic, non-conjugated carbon-carbon double bonds in its rings; and(c) at least one cyclic polysiloxane containing three or more .tbd.SiH groups; which is substantially tack-free.This invention is also directed to a laminate which is prepared by curing one or more of the prepregs beyond their gel point, and which may be clad with conductive material, and printed circuit boards made from such laminates.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: April 16, 1991
    Assignee: Hercules Incorporated
    Inventors: John K. Bard, Julia S. Burnier