Patents Represented by Attorney, Agent or Law Firm Martin F. Sloan
  • Patent number: 7476718
    Abstract: A process for the polymerization of formaldehyde, comprising contacting formaldehyde in a hydrocarbon solution with an aliphatic anhydride and a quaternary ammonium salt polymerization initiator of the formula: R1R2R3R4N+X? where R1 is an aliphatic or olefinic hydrocarbon group containing about 18 to about 25 carbon atoms; R2, R3, and R4 are each methyl, ethyl, and/or propyl, such that the total number of carbon atoms in R2, R3, and R4 combined is between 3 and 7; and X? is an organic anion.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: January 13, 2009
    Assignee: E.I. Du Pont de Nemours
    Inventor: Leslie M. Blair
  • Patent number: 6800264
    Abstract: Use of alkali metal carbonates to stabilize aqueous solutions of alkali metal aluminates.
    Type: Grant
    Filed: April 16, 2002
    Date of Patent: October 5, 2004
    Assignee: United States Aluminate Company
    Inventors: Timothy Edward Askew, Jasbir Singh Kumar, Brain Thomas Lenkowski, Matthew Allen Franczak
  • Patent number: 6479573
    Abstract: Process for thickening aqueous systems by addition of aqueous suspensions of water-soluble hydrophobically modified polyurethanes, polyacrylates and poly(acetal- or ketal-polyethers) and carbon containing salts.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: November 12, 2002
    Assignee: Hercules Incorporated
    Inventors: Charles Lee Burdick, Arjun Chandra Sau
  • Patent number: 6433056
    Abstract: Aqueous suspensions of water-soluble hydrophobically modified polyurethanes, polyacrylates and poly(acetal- or ketal-polyethers) and carbon containing salts, process of making the suspensions and process of using them as thickeners for aqueous systems.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: August 13, 2002
    Assignee: Hercules Incorporated
    Inventors: Charles Lee Burdick, Arjun Chandra Sau
  • Patent number: 6433161
    Abstract: Galactosylated hydroxyalkyl polysaccharides wherein galactose moieties are bound to the hydroxyalkyl polysaccharide by galactosidic bonds, and a process for preparing the galactosylated hydroxyalkyl polysaccharides having the steps: a) providing at least one hydroxyalkyl polysaccharide; and b) treating said hydroxyalkyl polysaccharide with a galactose donor in the presence of galactosidase enzyme for a time sufficient to convert at least a portion of said hydroxyl groups to galactosides.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: August 13, 2002
    Assignee: Hercules Incorporated
    Inventors: H. N. Cheng, Robert G. Nickol, George Wang, Jun Li
  • Patent number: 6417268
    Abstract: Method for producing an hydrophobically associative polymer is provided which is characterized by forming a monomer solution comprising a surfactant, at least one hydrophobic ethylenically unsaturated monomer, at least one hydrophilic monomer selected from nonionic ethylenically monomers, cationic ethylenically unsaturated monomers, anionic ethylenically unsaturated monomers or mixtures thereof, and water; forming a salt solution comprising a multivalent salt and water; mixing the monomer solution and salt solution to form a mixed solution; and charging the mixed solution with an initiator, thereby polymerizing the monomers to form the hydrophobically associative polymer in a dispersion. Aqueous dispersion containing the hydrophobically associative polymer formed by the method.
    Type: Grant
    Filed: December 6, 1999
    Date of Patent: July 9, 2002
    Assignee: Hercules Incorporated
    Inventors: Huashi T. Zhang, Baraka A. Kawawa, Fu Chen
  • Patent number: 6414055
    Abstract: There is disclosed a process for preparing an aqueous size composition by emulsifying a cellulose reactive size not solid at 25° C. into a starch stabilized aqueous polymer dispersion. The emulsification is carried out at a temperature substantially lower than 70° C.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: July 2, 2002
    Assignee: Hercules Incorporated
    Inventor: Rodrigue V. Lauzon
  • Patent number: 6406675
    Abstract: A method for reducing consumption of cyanide and level of carbon fouling during cyanide extraction of gold and silver from their ores by treating the ore or aqueous slurry of the ore with a water-soluble sequestering agent for the base metal species for a time sufficient for the sequestering agent to react with at least a portion of the base metal species.
    Type: Grant
    Filed: September 13, 2000
    Date of Patent: June 18, 2002
    Assignee: Hercules Incorporated
    Inventor: Terrence P. Small
  • Patent number: 6359040
    Abstract: Aqueous compositions having advantageous Theological properties, preferably including any of enhanced yield stress, enhanced viscosity, and/or enhanced water retention, are disclosed. Included are low-viscosity compositions having high yield stress. The present invention also relates to processes for preparing and using the compositions. Compositions of the present invention comprise aqueous compositions of a polymer having a net ionic charge, and a viscosity promoter having an opposite net ionic charge. Compositions may also comprise a moderating agent to prevent precipitation and/or gelation.
    Type: Grant
    Filed: May 11, 1999
    Date of Patent: March 19, 2002
    Assignee: Hercules Incorporated
    Inventor: Charles L. Burdick
  • Patent number: 6355137
    Abstract: A paper composition comprising: at least one cationic thermosetting resin comprising the reaction product of (i) at least one polyamide having secondary amine groups made from reactants comprising at least one polyalkylene polyamine, an acid component comprising succinic acid and optionally at least one dicarboxylic acid (other than succinic acid), and (ii) epihalohydrin. The paper is capable of being repulped substantially faster than paper that is substantially the same except that it contains conventional wet strngth resin.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: March 12, 2002
    Assignee: Hercules Incorporated
    Inventor: Ronald R. Staib
  • Patent number: 6325893
    Abstract: A sizing agent for paper that is a 2-oxetanone ketene multimer which is not solid at 35° C., particularly a multimer mixture in which at least 25 weight percent of the hydrocarbon substituents contain irregularities such as branched alkyl groups or linear or branched alkenyl groups. Paper surface sized with the 2-oxetanone ketene multimer sizing agent and the method of surface sizing paper are also disclosed.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: December 4, 2001
    Assignee: Hercules Incorporated
    Inventors: Clement L. Brungardt, Richard J. Riehle, Jian Jian Zhang
  • Patent number: 6315865
    Abstract: Silyl-linked polyamidoamines, and aqueous compositions including these resins, which have utility in wet strength, dry strength, creping, and glass fiber forming size applications. The resins also are useful as strength additives for paper that contains silicate mineral fillers and/or glass fibers.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: November 13, 2001
    Assignee: Hercules Incorporated
    Inventors: Anthony John Allen, Arjun C. Sau
  • Patent number: 6245874
    Abstract: A process for making paper with increased wet and dry strength by incorporating into the pulp suspension an ionic thermosettable resin which is the reaction product of dialdehyde and epihalohydrin, or epihalohydrin equivalent, with a copolymer containing monomer units derived by polymerization of monomers comprising acrylamide or alkyl-substituted acrylamide and diallylamine or an acid salt thereof. The paper has wet and dry strength greater than that of paper not containing the resin and has a higher repulpability index than wet strength paper that is essentially the same but contains conventional polyazetidinium ion containing wet strength resin instead of the ionic thermosettable resin.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: June 12, 2001
    Assignee: Hercules Incorporated
    Inventors: Ronald Richard Staib, Joseph Raymond Fanning, William Walter Maslanka
  • Patent number: 6228217
    Abstract: This invention is directed to a process for preparing an aqueous papermaking suspension containing a polyelectrolyte complex comprising providing an aqueous suspension of pulp fibers containing a water-soluble cationic polymer and a water-soluble anionic polymer that are reactable in the aqueous suspension to form the polyelectrolyte complex, and a multivalent cation having at least a +3 charge, and forming the polyelectrolyte complex. It also includes the process wherein the aqueous suspension of pulp fibers contains surface active carboxyl compounds and water-soluble anionic compounds. It further includes the process wherein the aqueous papermaking suspension is sheeted and dried to obtain paper of improved strength.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: May 8, 2001
    Assignee: Hercules Incorporated
    Inventors: Jay A. Dickerson, Harry J. Goldy, Douglas C. Smith, Ronald R. Staib
  • Patent number: 6217709
    Abstract: A composition comprising cationic starch, cationic galactomannan gum (such as cationic guar, locust bean and fenugreek gum) and acid suitable as drainage aid and strength additive in papermaking.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: April 17, 2001
    Assignee: Hercules Incorporated
    Inventor: Keith Edward Burnfield
  • Patent number: 6218588
    Abstract: The invention relates to aromatic modified aliphatic hydrocarbon resins giving excellent balance between tack and shear properties even at low coating weights. These resins are characterized in that they have a Ring and Ball (R&B) softening point of 94° C. or lower, a weight average molecular weight (Mw) of not more than 2000 Dalton, a Z-average molecular weight (Mz) of not more than 6000 Dalton and a mixed methylcyclohexane aniline cloud point (MMAP) between 25 and 45° C. The aromatic modified aliphatic hydrocarbon resins of the invention may be prepared by subjecting polymerization feeds containing petroleum feeds which comprise (a) C5 and C6 olefins and/or diolefins including cycloolefins, (b) aromatic monomers and (c) (di-)cyclodiolefins to a Friedel-Crafts polymerization. The invention is also directed to the use of the aromatic modified aliphatic hydrocarbon resins as mono-tackifiers in adhesive formulations as well as to an adhesive tape comprising these resins.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: April 17, 2001
    Assignee: Hercules Incorporated
    Inventors: Nicolaas Adriaan Dommisse, Christiaan Pieter Louis Charles Donker, Michael Hendrikus Theelen, Jacobus van Rijn, Gerard Arie Verrijzer
  • Patent number: 6210710
    Abstract: A pharmaceutical composition has a blend of at least first and second components and a medicament in a sufficient amount to be therapeutic where the first component is selected from hydroxypropylcellulose (HPC), ethylcellulose (EC), or derivatives of HPC, EC, and hydroxyethylcellulose (HEC) and the second component is at least one other polymer. When HPC is the first component, hydroxypropylmethylcellulose (HPMC), HEC, or carboxymethylcellulose will not be the second component and when EC is the first component, HPMC will not be the second component. The medicament can be a variety of drugs or nutritional supplements. The pharmaceutical composition releases the medicament for a prolonged or sustained period of time and can be formulated into many dosage forms.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: April 3, 2001
    Assignee: Hercules Incorporated
    Inventor: George William Skinner
  • Patent number: 6197100
    Abstract: Composition comprising water soluble polymer, such as cellulose ethers, guar, or derivatives thereof and surfactant, such as sorbitan esters, improves dispersibility of polymer in aqueous media.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: March 6, 2001
    Assignee: Hercules Incorporated
    Inventor: Mohand Melbouci
  • Patent number: 6183550
    Abstract: Aqueous paper size dispersions comprising: a) at least one paper sizing compound, and b) a water-soluble dispersant containing at least two hydrophilic groups and at least one hydrophobic group. Processes for sizing paper utilizing the aqueous paper size dispersions, and paper made by the processes.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: February 6, 2001
    Assignee: Hercules Incorporated
    Inventors: Herbert Conner, Tingdong Lin, Gert Tuin, Henrica G. M. van de Steeg
  • Patent number: 6171440
    Abstract: Process for repulping paper comprising providing paper comprising thermosetting resin which is the reaction product of epihalohydrin and polyamide made from polyalkylene polyamine, succinic acid and optionally another dicarboxylic acid and repulping the paper to obtain recycled pulp fibers.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: January 9, 2001
    Assignee: Hercules Incorporated
    Inventor: Ronald R. Staib