Patents Assigned to Hercules
  • Patent number: 5502091
    Abstract: A process for making paper to enhance the dry strength of the paper produced without substantially reducing its softness comprising adding to a bleached pulp furnish, separately or together, (1) an anionic polymer selected from the group consisting of carboxymethyl guar, carboxymethyl bean gum, carboxymethyl hydroxyethyl guar, and a carboxymethyl hydroxypropyl guar, with (2) a cationic polymer selected from the group consisting of a cationic guar, a cationic acrylamide copolymer, a cationic bean gum, a cationic amine-epichlorohydrin wet strength resin, and both a cationic wet strength resin and at least one of the other said cationic polymers, a composition for adding to a paper-making pulp slurry comprising the said polymers, a method for making the said composition, and a paper product containing the said composition, are disclosed.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: March 26, 1996
    Assignee: Hercules Incorporated
    Inventor: Sunil P. Dasgupta
  • Patent number: 5502160
    Abstract: The invention provides melt-spun polyolefin/polyarylate alloy fibers having an elevated softening point. These fibers are useful in staple lengths for the reinforcement of synthetic geoways (e.g., roadways, runways), especially those fabricated from asphalt-based pavements. The improved softening point of the fibers allows their incorporation into the hot-mix pavement used to fabricate and repair such surfaces without degradation of the fibers by the elevated temperatures found in plants for these manufacture of hot-mix pavements. This invention also provides an improved process for making melts of such allows.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: March 26, 1996
    Assignee: Hercules Incorporated
    Inventor: James P. Modrak
  • Patent number: 5491214
    Abstract: The color of hydrocarbon resins having carbon-carbon double bonds and containing color bodies is lightened by a hydrotreating process comprising contacting a resin having a weight average molecular weight Mw of 250-10,000 with hydrogen in the presence of a catalyst that promotes the hydrogenation of the color bodies without substantially changing the content of carbon-carbon double bonds in the resin. The preferred catalysts are copper chromite and copper/zinc.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: February 13, 1996
    Assignee: Hercules Incorporated
    Inventors: Norman E. Daughenbaugh, Dane G. Goodfellow
  • Patent number: 5491249
    Abstract: Cyclic polysiloxanes are produced by continuously passing a feed comprising linear polysiloxanes through a reactor containing a solid acidic catalyst at a pressure greater than one atmosphere under an inert atmosphere to produce a mixture comprising volatile cyclic polysiloxanes, nonvolatile reaction products, and unreacted linear polysiloxanes. The volatile products can then be recovered, and the nonvolatile reaction products and unreacted linear polysiloxanes can be added to the linear polysiloxane feed to form a recycle stream that is passed back through the reactor. Recycling increases the yield of the desired cyclic species.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: February 13, 1996
    Assignee: Hercules Incorporated
    Inventor: John N. Kostas
  • Patent number: 5487943
    Abstract: Multiconstituent fibers having a dominant continuous linear low density polyethylene phase, and one or more discontinuous phase polymers, dispersed through the dominant continuous phase in the form of domains. The indicated discontinuous phases polymers are chosen from among polypropylene and poly(propylene-co-ethylene) copolymers.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: January 30, 1996
    Assignee: Hercules Incorporated
    Inventor: Randall E. Kozulla
  • Patent number: 5485662
    Abstract: Apparatus and method for crimping fiber, especially polypropylene fiber, includes feeding a tow through driven rolls into a stuffer box. Heat, in the form of steam, is applied to the tow prior to the rolls. The stuffer box includes doctor blades for cooling the tow. The doctor blades include a leading tip portion, through which compressed air is fed over the tow, and a trailing section including at least one internal compartment for a cooling fluid.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: January 23, 1996
    Assignee: Hercules Incorporated
    Inventors: Ray W. Hodges, Jr., Shiv Sibal
  • Patent number: 5484952
    Abstract: A process for making an alkyl ketene dimer by the dehydrohalogenation reaction of a C.sub.8 -C.sub.32 aliphatic fatty acid chloride with a tertiary amine in an inert solvent and the product of the process; the solvent comprising at an oxygenated hydrocarbon.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: January 16, 1996
    Assignee: Hercules Incorporated
    Inventors: Timothy F. Nolan, Brian M. Stubbs
  • Patent number: 5472570
    Abstract: A paper-making furnish, comprising poly(paravinyl phenol), also known as poly(hydroxy styrene), in admixture with polyethylene oxide, and a process for retaining fine particles in paper-making comprising adding poly(paravinyl phenol) and polyethylene oxide to a paper-making furnish, are disclosed.
    Type: Grant
    Filed: March 24, 1994
    Date of Patent: December 5, 1995
    Assignee: Hercules Incorporated
    Inventor: Elliott Echt
  • Patent number: 5470640
    Abstract: High loft durable nonwoven material comprising facing and base components and corresponding process for preparation thereof and process for obtaining by(a) forming and compiling a facing component comprising one or more facing web(s) of staple fiber and/or fibrillated film;(b) lightly bonding the formed and compiled facing webs, utilizing a low density bonding pattern having a small bonding area relative to the corresponding surface area of said facing component;(c) laying a web comprising staple fiber and/or fibrillated film onto the lightly bonded facing component under conditions favoring arrangement in general cross or transverse direction relative to machine direction of the facing component; and(d) bonding said cross or transversely laid web to form a base component to said facing component, utilizing a substantially greater bonding density then employed for said facing component, to obtain the desired nonwoven material.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: November 28, 1995
    Assignee: Hercules Incorporated
    Inventor: James P. Modrak
  • Patent number: 5470742
    Abstract: Enzymatic dehalogenation of undesirable nitrogen-free organohalogen compounds is carried out by adding bacteria to an aqueous composition comprising a nitrogen-free organohalogen compound and a nitrogen-containing cationic polymer. The enzymatic dehalogenation of the nitrogen-free organohalogen compound is achieved without any substantial effect upon the nitrogen-free organohalogen compound. The dehalogenation method may be carried out via continuous, batch, or semi-continuous processes NCIMB 40271, 40272, 40273 and 40274 were deposited on Apr. 2, 1990. NCIMB 40313 was deposited on Aug. 31, 1990 and NCIMB 40383 was deposited on Mar. 11, 1991.
    Type: Grant
    Filed: May 16, 1994
    Date of Patent: November 28, 1995
    Assignee: Hercules Incorporated
    Inventors: Alan Bull, David J. Hardman, Brian M. Stubbs, Paul J. Sallis
  • Patent number: 5468311
    Abstract: An improved crosslinked double base propellant composition is provided which has an improved binder system. The binder system is based on nitrocellulose (NC) having an intrinsic viscosity of from about 0.4 dl./gram to about 1.5 dl./gram and a polyester polyol or polyether polyol (polyol), in which the weight ratio of NC/polyol is from about 0.03/1 to about 0.8/1. The binder crosslinking agents are diisocyanates, and the ratio of NCO groups of the diisocyanates to combined OH groups of nitrocellulose and polyol is from about 0.7/1 to 1.2/1. Energetic plasticizer such as nitroglycerin comprises from about 68% to about 82% by weight of the binder. The binder contains a stabilizer and is capable of high solids loading, i.e., 70% to 77% solids.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: November 21, 1995
    Assignee: Hercules Incorporated
    Inventors: James H. Godsey, James L. Jacox, Robert F. Keller, Richard J. Legare
  • Patent number: 5466512
    Abstract: Disclosed are flame retardant organosilicon compositions, wherein the organosilicon compositions comprise residues derived from (a) polycyclic polyene compounds and (b) residues derived from cyclic polysiloxanes, tetrahedral siloxysilanes and linear poly(organohydrosilioxane)s. Preferably the compositions contain flame retardants, such as a phosphorus containing or halogen containing flame retardant, which may be microencapsulated. Also disclosed are processes for making such compositions and articles made from such compositions.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: November 14, 1995
    Assignee: Hercules Incorporated
    Inventors: Laura M. Babcock, John K. Bard, Raymond T. Leibfried, Sr.
  • Patent number: 5466728
    Abstract: Disclosed are flame retardant organosilicon compositions, wherein the organosilicon compositions comprise residues derived from (a) polycyclic polyene compounds and (b) residues derived from cyclic polysiloxanes, tetrahedral siloxysilanes and linear poly(organohydrosiloxane)s. Preferably the compositions contain flame retardants, such as a phosphorus containing or halogen containing flame retardant, which may be microencapsulated. Also disclosed are processes for making such compositions and articles made from such compositions.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: November 14, 1995
    Assignee: Hercules Incorporated
    Inventors: Laura M. Babcock, John K. Bard, Raymond T. Leibfried, Sr.
  • Patent number: 5456800
    Abstract: A process for increasing the resistance of the cut edges of liquid packaging board to penetration by hot hydrogen peroxide, comprising adding to an aqueous pulp slurry at a neutral to alkaline pH, either separately or in preblended form an aqueous emulsion of a cellulose-reactive size, a non-cellulose-reactive size selected from the group consisting of waxes, bis-stearamides, and fatty acid derivatives, and a thermosetting resin that is capable of covalent bonding to cellulose fiber and self-cross-linking.
    Type: Grant
    Filed: July 19, 1993
    Date of Patent: October 10, 1995
    Assignee: Hercules Incorporated
    Inventors: Anthony C. Tansley, John D. Ballantine
  • Patent number: 5451637
    Abstract: Crosslinkable and crosslinked compositions comprising silicon compounds, unsaturated elastomeric polymers and polyenes. Along with, or instead of these polyenes and silicon compounds, crosslinkable prepolymers prepared from such polyenes and silicon compounds may be included. Crosslinking, of the crosslinkable compositions, may be accomplished by hydrozilation, in the presence of hydrosylation catalysts.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: September 19, 1995
    Assignee: Hercules Incorporated
    Inventor: Raymond T. Leibfried
  • Patent number: 5441812
    Abstract: The invention provides polyolefin staple fibers especially useful for reinforcing pavement. The fibers have applied to their surface an amount of an antistatic finish sufficient to prevent the build-up of static electric charges when the staple fibers are fluidized or blown, and so diminish the resultant clumping of the blown fibers, while avoiding degradation of the nature of the fiber to adhere to paving compositions, and maintaining the adherence of the fibers to the pavement cement.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: August 15, 1995
    Assignee: Hercules Incorporated
    Inventor: James P. Modrak
  • Patent number: 5433776
    Abstract: An improvement is disclosed in a method for sizing a paper product of sheeted cellulosic fibers by incorporating into the fibers a ketene dimer size, the improvement involving treating the fibers with an aquasol of positively charged colloidal silica, positively charged colloidal alumina, or positively charged colloidal zirconia containing the ketene dimer size.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: July 18, 1995
    Assignee: Hercules Incorporated
    Inventor: Sunil P. Dasgupta
  • Patent number: 5431994
    Abstract: High strength spun melt fiber, preparation thereof utilizing threadline oxidative chain scission degradation of hot fiber spun from polymer component(s) having a broad molecular weight distribution in conjunction with a delayed quench step, and corresponding nonwoven material obtained therefrom.
    Type: Grant
    Filed: September 2, 1992
    Date of Patent: July 11, 1995
    Assignee: Hercules Incorporated
    Inventor: Randall E. Kozulla
  • Patent number: 5430200
    Abstract: The present invention provides in a particular embodiment an improvement in the process for producing phenol by the acid-catalyzed cleavage of cumene hydroperoxide (CHP). The reactant stream fed to the cleavage reactor also includes the contaminant by-product dimethyl benzyl alcohol (DMBA) formed during the direct oxidation of cumene to CHP. This contaminant DMBA further reacts in the cleavage reactor to reduce the yield of phenol and produce undesirable and unreclaimable by-products. The improvement provided herein comprises performing the cleavage reaction at a reduced residence time of generally from one-half to five minutes, whereby the formation of .alpha.-methyl styrene from DMBA is promoted and the formation of the undesirable and unreclaimable by-products is reduced; .alpha.-methyl styrene is not only a useful by-product, but can be recycled and hydrogenated to the cumene starting material.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: July 4, 1995
    Assignee: Hercules Incorporated
    Inventor: Horace E. Hood
  • Patent number: 5430229
    Abstract: Gel and solid rocket propellant is physically and chemically ablated from motors using a liquid or gaseous reagent such as anhydrous ammonia propelled by compressed nitrogen gas at 2000 psig or higher. Nitroglycerine and nitrocellulose are nitrate esters preferentially ablated from class 1.1 rocket propellant by anhydrous ammonia at a temperature of 70.degree. F. or higher.
    Type: Grant
    Filed: December 30, 1992
    Date of Patent: July 4, 1995
    Assignee: Hercules Incorporated
    Inventor: Kim R. Voss