Patents Examined by Christopher A. Henderson
  • Patent number: 6090875
    Abstract: The subject invention provides water-swellable polymer compositions having reduced dusting tendencies, i.e., reduced amounts of unassociated dust having a maximum diameter less than or equal to 10 microns and/or the tendency to generate reduced amounts of unassociated dust having a maximum diameter less than or equal to 10 microns upon attrition and a process for preparing such compositions. Hydrophobic dedusting agents are used to achieve the above while substantially maintaining or increasing the surface tension of an aqueous fluid in equilibrium with the polymer and air.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: July 18, 2000
    Assignee: The Dow Chemical Company
    Inventors: Thomas L. Staples, Jerry D. DeVrieze
  • Patent number: 6090873
    Abstract: A coating resin composition is able to form a coating film having not only high hardness and weatherability but also high toughness, and can be cured both at room temperature and by heating curing, and further which is good at storage stability.The coating resin composition consists essentially of a silica-dispersed oligomer solution of organosilane prepared by partially hydrolyzing a hydrolyzable organosilane represented by a formula R.sup.1.sub.n SiX.sub.4-n, in colloidal silica dispersed in an organic solvent, water or a mixture thereof, and an acrylic resin which is a copolymer of acrylate or methacrylate represented by a formula, CH.sub.2 .dbd.CR.sup.2 (COOR.sup.3), and a curing catalyst. This composition is used by separating the components into two solutions and then mixing thereof as required. A resin-coated article comprises a cured resin layer of the coating resin composition on the surface of a substrate.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: July 18, 2000
    Assignees: Matsushita Electric Works, Ltd., Toshiba Silicone Co. Ltd.
    Inventors: Junko Okibe, Minoru Inoue, Motoaki Haruna, Ayumu Yasuda, Takeshi Sunaga, Yasuyo Iwabuchi, Norio Sato
  • Patent number: 6090892
    Abstract: Disclosed herein are a (co)polymer comprising, as an essential component, a (co)polymer containing a recurring unit in a predetermined proportion, and its production process. The recurring unit contains a specific amido group and/or a particular hydroxyl group as a pendant group. This (co)polymer is generally obtained in the form of powder and features extremely easy redispersion, and is useful especially as a cement additive for improving physical properties of cement.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: July 18, 2000
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Ishida, Yoshio Kikuta, Futoshi Hoshino, Katsunari Matsumoto
  • Patent number: 6087448
    Abstract: Poly(vinylguanidine)-based superabsorbent gels are disclosed. The superabsorbent gels either comprise a mixture of a poly(vinylguanidine) polymer and an acidic water-absorbing polymer, like polyacrylic acid, or comprise a salt of a poly(vinylguanidine) polymer.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: July 11, 2000
    Assignee: AMCOL International Corporation
    Inventors: Michael A. Mitchell, Thomas W. Beihoffer
  • Patent number: 6087451
    Abstract: A polymer having groups located at the ends of the polymer chain which groups are derived from stable free radical compounds, wherein the polymer is of the formula:SFR-(R)-SFRwherein SFR represents a covalently bonded stable free radical group and R represents a thermoplastic resin.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: July 11, 2000
    Assignee: Xerox Corporation
    Inventors: Michael K. Georges, Toyofumi Inoue, Gordon K. Hamer, Peter M. Kazmaier, Richard P. N. Veregin
  • Patent number: 6079468
    Abstract: This invention relates to the discovery that the combination of a bismaleimide compound and a bis benzothiazolyldithio end capped compound provides for excellent vulcanization of rubbers and results in desirable reversion resistant rubbers properties.
    Type: Grant
    Filed: August 9, 1996
    Date of Patent: June 27, 2000
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Richard Michael D'Sidocky, Neil Arthur Maly, Lawson Gibson Wideman
  • Patent number: 6077912
    Abstract: A method is disclosed for processing a rubber composition comprising thermomechanically mixing at a rubber temperature in a range of 140.degree. C. to 190.degree. C. for a mixing time of 1 to 20 minutes(i) 100 parts by weight of at least one sulfur vulcanizable elastomer selected from conjugated diene homopolymers and copolymers, natural rubber and copolymers of at least one conjugated diene and aromatic vinyl compound;(ii) 10 to 250 phr of particulate precipitated silica;(iii) 0.01 to 1.0 parts by weight per weight of said silica of an organosilicon compound; and(iv) 0.05 to 10 phr of sodium thiosulfate pentahydrate.Addition of the sodium thiosulfate pentahydrate to sulfur vulcanizable rubber, silica and sulfur containing organosilicon compound decreases the mixing/processing time without sacrificing end product properties.
    Type: Grant
    Filed: December 4, 1997
    Date of Patent: June 20, 2000
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Richard Michael D'Sidocky, David John Zanzig, Shingo Futamura
  • Patent number: 6075098
    Abstract: A pneumatic tire comprising a tire tread wherein a foamed rubber layer is provided at least in the portion substantially contacting with a road surface, and wherein said foamed rubber layer, which has closed cells, has an expansion ratio of about 2% to about 50%, and the solid rubber phase in said foamed rubber layer contains, in an amount of about 0.5 to about 5 parts by weight per 100 parts by weight of the rubber component, a vulcanization accelerator represented by one of the following general formula: ##STR1## wherein R.sup.1 and R.sup.2 each independently represents an atom or a group selected from a group consisting of a hydrogen atom, alkyl groups, and aryl groups, excluding a case in which each of R.sup.1 and R.sup.2 simultaneously represents a hydrogen atom. The pneumatic tire which is used as an excellent studless tire suppresses deterioration in performance on ice or snow in the final period of tire use compared to the performance in the initial period of tire use.
    Type: Grant
    Filed: July 11, 1997
    Date of Patent: June 13, 2000
    Assignee: Bridgestone Corporation
    Inventors: Kentaro Fujino, Hideki Matsui
  • Patent number: 6075096
    Abstract: The present invention relates to rubber compounds containing aromatic ketone polysulfides of the formula: ##STR1## wherein R is selected from the group consisting of alkyls having from 1 to 18 carbon atoms and x is an integer of from 2 to 8.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: June 13, 2000
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Lawson Gibson Wideman, Shingo Futamura
  • Patent number: 6072027
    Abstract: A process for preparing a conductive polymer is described. The process comprises reacting under polymerization conditions and in the presence of a reaction medium, a conductive polymer precursor, a strong acid, and a chlorate salt or chloric acid and an iron salt. It has surprisingly been discovered that this combination of oxidants promotes higher yields of the conductive polymer than either the chlorate salt or chloric acid or the iron salt.
    Type: Grant
    Filed: November 18, 1997
    Date of Patent: June 6, 2000
    Assignee: The Dow Chemical Company
    Inventors: Carey L. Scortichini, Susan J. Babinec
  • Patent number: 6072009
    Abstract: The specification discloses a method for vulcanizing an elastomer using as the cure promoter the monomeric distillate by-product from the clay-based dimerization of an unsaturated fatty acid mixture, preferably a tall oil fatty acid mixture. The distillate provides a cost-effective alternative to conventional fatty acid promoters.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: June 6, 2000
    Assignee: Arizona Chemical Company
    Inventors: Claude Frank Phillips, Jr., Alexander J. Conte
  • Patent number: 6069208
    Abstract: A crosslinkable composition of a polymeric thermoplastic and/or elastomeric material which is susceptible to scorching when processed at elevated temperatures, prior to crosslinking, in the presence of a free radical initiator, is protected against such scorching by the incorporation therein of a mixture of at least one hydroquinone compound and a sulfur accelerator. This mixture may also contain at least one monomeric allylic, methacrylic, acrylic or diene type coagent. The mixture exhibits a synergistic effect resulting in improved scorch protection for peroxide cured systems when compared with the protection afforded by the components singly.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: May 30, 2000
    Assignee: ELF Atochem N.A., Inc.
    Inventors: Michael Fred Novits, Chester Joseph Kmiec, Edward Phillip Hibbard
  • Patent number: 6069217
    Abstract: Thickening composition are produced by linking a polyurethane comprising polyisocyanates, polyether polyols, modifying agents and capping agents with an alkali swellable copolymer comprising ethylenically unsaturated carboxylic acid monomers and nonionic vinyl monomers through a connecting monomer having a polymerizable double bond and a hydrogen active group. The thickening composition are used to provide improved viscosity control, flow and leveling to aqueous systems such as paints and coatings, inks, drilling fluids, adhesives, construction materials, personal care and housedhold products.
    Type: Grant
    Filed: March 7, 1997
    Date of Patent: May 30, 2000
    Assignee: Rheox, Inc.
    Inventors: Hemi N. Nae, Alice C. Eng
  • Patent number: 6063873
    Abstract: A rubber tread stock comprising a vulcanizable composition of matter, and a triazine, wherein said triazine is defined by the formula ##STR1## where X is selected from the group consisting of hydrogen, halides, amines, and organic groups having from 1 to about 20 carbon atoms, Y is selected from the group consisting of halides, alkoxy derivatives, amine derivatives, aryloxy derivatives, and urea derivatives, with the proviso that the substituent Y is displacable by a reaction with a secondary amine, and Z is selected from the group consisting of alkoxy derivatives, amino derivatives, aryloxy derivatives, and urea derivatives, with the proviso that the substituent Z is displacable by a reaction with a secondary amine.
    Type: Grant
    Filed: December 31, 1997
    Date of Patent: May 16, 2000
    Assignee: Bridgestone Corporation
    Inventors: David F. Lawson, Ashley S. Hilton, John R. Schreffler, Roderic P. Quirk
  • Patent number: 6063879
    Abstract: This invention is a solution process for the preparation of high molecular weight ethylene copolymers comprising contacting olefin monomers, with a catalyst system at a polymerization temperature at or above about 80.degree. C. with a catalyst system comprising an unbridged Group 4 metal compound having a monocyclopentadienyl ligand, a phosphinimine ligand and at least one uninegative, activation reactive ligand. The process can be practiced at a reaction temperature of at least 80.degree. C. to obtain high number average molecular weight polymer.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: May 16, 2000
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Douglas W. Stephan, Jeff C. Stewart, Stephen John Brown, John William Swabey, Qinyan Wang
  • Patent number: 6060564
    Abstract: A process for the (co)polymerization of a monomer material, which includes at least an acrylonitrile monomer as an essential component, at a temperature of 80.degree. C. or higher by bulk or solution polymerization while allowing said monomer material to evaporate. The (co)polymerization is conducted while providing a vapor phase over a polymerization mixture in a reaction tank. During the (co)polymerization, the temperature of the vapor phase is maintained in a range of from 30.degree. C. to 65.degree. C. so that the polymerization is conducted without substantially releasing vapor, which is evaporated from the polymerization mixture, to outside of the reaction tank. By cooling the vapor phase of the reaction tank and maintaining its temperature in the above specific range in accordance with the present invention, it is possible to avoid mixing of a gelled polymer in a product and also to effectively remove reaction heat at the time of the (co)polymerization.
    Type: Grant
    Filed: December 19, 1995
    Date of Patent: May 9, 2000
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Mutsuko Uchida, Mune Iwamoto, Akihiko Nakajima, Masato Takaku, Hisato Morita, Koji Kawano
  • Patent number: 6051320
    Abstract: A thin walled natural rubber latex material is disclosed suitable for forming thin walled products including gloves, dental dams and shields, catheter tubing, penrose surgical drains, finger cots, coverings for body parts, and the like. The thin walled material is formed from a latex emulsion containing natural rubber, sulphur-free, oxygen-donating curing agents, and a strength enhancing agent which may be an inorganic substance such as fumed silica and/or an organic substance such as monomers and polymers of families of acrylics and esters. The emulsion also preferably includes microcrystaline wax as an oxygen barrier, and the material is also provided with a heat resistant and water resistant coating which blocks transfer of latex proteins from the material and enhances slip of the material.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: April 18, 2000
    Assignee: Audra International, L.L.C.
    Inventors: Audra Noecker, Teon Hau Ho
  • Patent number: 6051658
    Abstract: A catalyst useful for the condensation of an aldehyde or ketone starting material with a phenol is an insoluble mercaptosulfonic acid compound. The heterogeneous catalysts comprise catalytically-active species represented by the formula: ##STR1## L is an optional linking group and -- is a bond, which catalytically-active species is attached by the bond -- to an insoluble organic or inorganic support;or a catalytically-active species represented by the formula: ##STR2## wherein L' is an optional linking group, -- is a bond and .theta.' and .theta." are residues of .theta., and a and b are independently selected from integers equal to or greater than 1.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: April 18, 2000
    Assignee: The Dow Chemical Company
    Inventors: Richard M. Wehmeyer, Emmett L. Tasset, Marlin E. Walters
  • Patent number: 6048943
    Abstract: The present invention relates to titanate compounds of the formula ##STR1## wherein R is selected from the group consisting of alkylene groups having from 1 to 15 carbon atoms and arylene and alkyl substituted arylene groups having from 6 to 10 carbon atoms and x is an integer of from 2 to 8.
    Type: Grant
    Filed: April 7, 1998
    Date of Patent: April 11, 2000
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Edward John Blok, Lawson Gibson Wideman, Paul Harry Sandstrom, Mark Leslie Kralevich, Jr.
  • Patent number: 6046278
    Abstract: High temperature polymerization process and products obtained therefrom are provided. The polymerization is conducted at above 225.degree. C. to produce polymers having a degree of polymerization below 50. The products are useful as detergent additives and for subsequent polymerization.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: April 4, 2000
    Assignee: Rohm and Haas Company
    Inventors: Michael Bennett Freeman, Gary Robert Larson, Richard Foster Merritt, Yi Hyon Paik, Jan Edward Shulman, Graham Swift, Robert Wilczynski