Patents Examined by S. A. Acquah
  • Patent number: 6720008
    Abstract: A method and composition for the encapsulation of hydrophilic molecules in submicron particles is disclosed. The particles are composed of a water-in-oil microemulsion surrounded by one or more biocompatible polymers.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: April 13, 2004
    Assignee: PR Pharmaceuticals, Inc.
    Inventor: Stewart Dean Allison
  • Patent number: 5644020
    Abstract: The invention relates to thermoplastically processible aliphatic polyesteramides which are biodegradable (compostable).
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: July 1, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ralf Timmermann, Ralf Dujardin, Rainhard Koch
  • Patent number: 5399661
    Abstract: Copolyester compositions are provided which comprise the reaction product of at least one straight chain, branched, or cycloaliphatic C.sub.2 -C.sub.10 alkane diol or a chemical equivalent thereof, a mixture of at least two cycloaliphatic diacids or chemical equivalents thereof, the mixture comprising predominantly a trans-enantiomer, and at least one aromatic diacid or a chemical equivalent thereof. These copolyesters have superior ductility to the homopolymers of the diol component and either of the diacid components.
    Type: Grant
    Filed: July 12, 1990
    Date of Patent: March 21, 1995
    Assignee: General Electric Company
    Inventor: Willem F. H. Borman
  • Patent number: 5352556
    Abstract: A low melt toner resin with low minimum fix temperature and wide fusing latitude contains a linear portion and a cross-linked portion containing high density cross-linked microgel particles, but substantially no low density cross-linked polymer. The resin may be formed by reactive melt mixing.
    Type: Grant
    Filed: March 23, 1993
    Date of Patent: October 4, 1994
    Assignee: Xerox Corporation
    Inventors: Hadi K. Mahabadi, Enno E. Agur, Gerald R. Allison, Michael S. Hawkins, Stephan Drappel, Maria N. V. McDougall, Bernard Grushkin, Thomas R. Hoffend, Angelo J. Barbetta
  • Patent number: 5306806
    Abstract: The invention concerns a thermosetting polyester resin capable of forming an anisotropic molten phase comprising a repeating unit of the formula: A-X-B alone, or a combination of the repeating unit of the formula: A-X-B and the repeating unit of the formula: R, adjoining two repeating units being connected each other through an ester bond, in which A represents a mesogenic group defined in the specification, B is a spacer group defined in the specification, X is an ester bond, and R represents a bivalent to hexavalent aliphatic, aromatic or alicyclic hydrocarbon residue, the end bondings of the connected repeating units being occupied by OH, COOH or their reactive derivatives and the sum of the resinous acid value and the OH value being 10 to 200.The invention also provides a powder coating resinous composition containing the abovesaid resin.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: April 26, 1994
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Hisaki Tanabe, Ryozo Takagawa, Yoshio Eguchi
  • Patent number: 5300593
    Abstract: A binding agent for molding compositions and molded bodies produced by reacting a low molecular weight lignin from the Organosolv process with phenol in a weight ratio of 1:20 to 3:1 at 100.degree. to 180.degree. C., adjusting the pH to an acidic value and condensing the mixture with 0.2 to 0.9 moles of formaldehyde per mole of phenol at 60.degree. to 120.degree. C. to form the binding agent useful for producing curable molding compositions, high-temperature molding compositions, refractory products, textile fleeces and friction coatings as well as carbon materials.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: April 5, 1994
    Assignee: Rutgerswerke Aktiengesellschaft AG
    Inventors: Arno Gardziella, Achim Hansen, Stephan Schroter, Josef Suren
  • Patent number: 5298530
    Abstract: A process of recovering components such as ethylene glycol and dimethylterephthalate from scrap polyester. The process steps are: (a) introducing oligomers of ethylene glycol and terephthalate acid or dimethyl terephthalate to a first vessel and heating the oligomers; (b) introducing scrap polyester to the first vessel and forming a startup melt with the oligomers; (c) transferring melt from the first vessel to a second vessel; (d) passing super-heated methanol through the melt in the second vessel to form a final melt comprising low molecular weight polyesters and monomers; (e) transferring final melt from the second vessel to the first vessel; and (f) recovering components from the second vessel.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: March 29, 1994
    Assignee: Eastman Kodak Company
    Inventors: William J. Gamble, Andrius A. Naujokas, Bruce R. DeBruin
  • Patent number: 5296520
    Abstract: Compositions containing aryl phosphites and water to hydrolyze the aryl phosphite provide controlled and extended work time when used as hardening agents for the ambient temperature hardening of phenolic resins and for rapid hardening of such resins at modestly elevated temperatures. Pre-solvolysis with small quantities of water, alkanols of 1 to 4 carbon atoms or alkylene glycols of 2 to 4 carbon atoms improve compatibility of trisubstituted phosphites with the resin. Pre-hydrolysis of the phosphites as well as addition of furfuryl alcohol or alkylene glycols of 2 to 4 carbon atoms accelerate the hardening (curing) of the resin. Various compounds such as: carboxylic acid amides, urea, dicyandiamide, N-methylolated amides, N-alkyl 2-pyrrolidinones having 1 to 4 carbon atoms in the alkyl group, those having an internal epoxide group, alkanols, and Schiff bases retard the ambient temperature hardening of the resin with the aryl phosphite hardening agents.
    Type: Grant
    Filed: December 9, 1992
    Date of Patent: March 22, 1994
    Assignee: Borden, Inc.
    Inventor: Arthur H. Gerber
  • Patent number: 5296587
    Abstract: The present invention relates to a process for copolymerizing a dicarboxylic acid, a dialkyl ester, and a diol in the presence of a transesterification catalyst. The process involves heating a mixture containing carboxylic acids and esters in excess diol at elevated temperatures in the presence of a transesterification catalyst and returning any vaporized diol to the reaction vessel until the theoretical amount of alcohol and/or water have been evolved. The alcohol and/or water of reaction is not allowed to return to the vessel. When the theoretical weight of alcohol and/or water is collected, the excess diol is removed and the polymerization is allowed to proceed.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: March 22, 1994
    Assignee: Eastman Chemical Company
    Inventors: Charles E. Sumner, Jr., Gary D. Boone
  • Patent number: 5294695
    Abstract: The present invention relates to a process for preparing a polyethylene naphthalate possessed with high viscosity, characterized by sloving of various problems of the prior art by controlling the rate of the polycondensation reaction.Particularly, the present invention provides a process for preparing polyethylene naphthalate from an esterification reaction product of naphtalene dicarboxylic acid or an alkyl ester thereof and a diol, which comprises polycondensing the esterification reaction product in the presence of a polycondensation catalyst in two steps wherein the first step is carried out at a pressure ranging from 500 to 30 torr and the second step is carried out at a pressure ranging from 10 to 0.1 torr with controlling the reaction rate such that the differential increase of the intrinsic viscosity of the resultant polymer can satisfy the following equations:IV(t.sub.1)-IV(t.sub.0)<0.4 dl/g (1)IV(t.sub.2)-IV(t.sub.0)>0.3 dl/g (2)wherein: IV(t.sub.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: March 15, 1994
    Assignee: SKC Limited
    Inventors: Kwan-Kyung Lee, Byeong-Ho Cho, Yong-Won Kim
  • Patent number: 5288840
    Abstract: A polyoxymethylene copolymer excellent in stability and mechanical properties which is comprised of oxymethylene units and oxyalkylene units and has a molecular weight of 10,000 to 200,000. The proportion of oxyalkylene units to oxymethylene units is 0.07 to 0.5% by mole and the ratio of the absorbance of terminal formate groups to that of methylene groups determined by infrared spectrophotometry is not more than 0.025. A process for producing the copolymer is also disclosed.
    Type: Grant
    Filed: June 2, 1992
    Date of Patent: February 22, 1994
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Hirohisa Morishita, Kazuhiko Matsuzaki
  • Patent number: 5288781
    Abstract: The present invention relates to a biaxially oriented polyester film comprising a metallic alkylbenzene sulfonate derivative of formula(I), polyethylene glycol and, optionally, bis(4-.beta.-hydroxyalkoxyphenyl) sulfones of formula(II), which has improved antistatic property, clarity, mechanical properties and heat resistance: ##STR1## wherein: R represents an optionally substituted C.sub.8-25 alkyl group;M represents an alkali or alkali earth metal;m is an integer of 100 or fewer; andn is an integer from 1 to 10.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: February 22, 1994
    Assignee: SKC Limited
    Inventors: Kwang-Jin Song, Byeong-Ho Cho, Yong-Won Kim
  • Patent number: 5286788
    Abstract: A composition and method for the polymerization of polymerizable resins which undergo exothermic polymerization, including unsaturated polyester resins, vinyl ester resins and mixtures thereof, and the polymerized product thereof, wherein an ester of a thiocarboxylic acid is present in a effective amount to substantially reduce the exothermic heat generated during polymerization of the resin, but insufficient to substantially affect the degree or rate of polymerization of the resin.
    Type: Grant
    Filed: December 29, 1992
    Date of Patent: February 15, 1994
    Assignee: Witco Corporation
    Inventor: Mohammed Shahid
  • Patent number: 5283542
    Abstract: A composition of matter is provided which comprises low-shrinkage, wet-type unsaturated polyester (B.M.C.) having high thermal conductivity, glass fibers, and a particulate aluminum nitride filler having high thermal conductivity. Also provided is an electrical component housing which possesses high thermal conductivity and heat dissipation properties including a body of a low-shrinkage, wet-type unsaturated polyester (B.M.C.) composition having high thermal conductivity.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: February 1, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Haruyuki Ochiai, Sadatoshi Murakami, Setsuo Hosogai
  • Patent number: 5281644
    Abstract: There are disclosed methods and compositions for retarding the ambient temperature hardening of a phenolic resole resin alone or with an aggregate when such resin is contacted with a nitroalkane and a hardening agent such as lightburned magnesium oxide, an organic ester functional hardening agent, and mixtures of lightburned magnesium oxide and an organic ester functional hardening agent in an alkaline medium. There is also disclosed a hardener composition for phenolic resole resins wherein the hardener composition consists essentially of a solution of a nitroalkane in an organic ester functional hardening agent.
    Type: Grant
    Filed: November 4, 1992
    Date of Patent: January 25, 1994
    Assignee: Borden, Inc.
    Inventors: S. Raja Iyer, David R. Armbruster, Arthur H. Gerber
  • Patent number: 5281647
    Abstract: The present invention relates to a polymeric plasticizer and a process for plasticizing material therewith; said polymeric material comprises a reaction product of a diacid with a highly hindered diol and another diol in a stoichiometric excess of the acid over the diol, followed by reacting the resulting product containing an acid end group with an alcohol, followed by removing residual alcohol to obtain a final product having a hydroxyl value of less than 20.
    Type: Grant
    Filed: November 10, 1992
    Date of Patent: January 25, 1994
    Assignee: Miles Inc.
    Inventor: Thomas Eapen
  • Patent number: 5278280
    Abstract: Hard resinous polyol esters having a high degree of hydroxyl functionality and a ball and ring softening temperature of at least about 50.degree. C.
    Type: Grant
    Filed: June 26, 1990
    Date of Patent: January 11, 1994
    Assignee: Imcera Group Inc.
    Inventor: Paul E. Eckler
  • Patent number: 5270402
    Abstract: This invention relates to hyperbranched, functional polyesters.
    Type: Grant
    Filed: September 14, 1992
    Date of Patent: December 14, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Garret D. Figuly
  • Patent number: 5268135
    Abstract: A biaxial oriented polyester film of the present invention has a density of 1.386 g/cm.sup.3 or more. A sum Y of the coefficients of the heat shrinkage in the machine direction and in the transverse direction of the film at a temperature of 150.degree. C. is 4.5% or more, and a sum X (kg/mm.sup.2) of F.sub.5 values in the machine direction and in the transverse direction of the film and the sum Y satisfy the following expression (I):Y.sup.2 +3.2Y.gtoreq.19.2X-393.6 (I)wherein the F.sub.5 value refers to an applied force required for extending a film by 5%.
    Type: Grant
    Filed: April 2, 1992
    Date of Patent: December 7, 1993
    Assignees: Toyo Boseki Kabushiki Kaisha, Nippon Magphane Co., Ltd.
    Inventors: Yasushi Sasaki, Toshitake Suzuki, Yutaka Baba
  • Patent number: 5268452
    Abstract: Unsaturated polyester resins of the type already having reactive liquid polymers reacted into the backbone of the resins, are cured in the presence of a reactive liquid polymer additive admixed with the prereacted unsaturated polyester resin. Heating of this system during cure causes the reactive liquid polymer additive to miscibilize with the unsaturated polyester resin. The unsaturated polyester resin modified in the manner described above shows a significant enhancement in toughness as measured by fracture energy over unmodified counterparts or counterparts modified by known methods of adduction or admixing alone.
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: December 7, 1993
    Assignee: The B.F. Goodrich Company
    Inventors: Alan R. Siebert, Robert J. Bertsch