Patents Examined by Maurice J. Welsh
  • Patent number: 5382603
    Abstract: The variations in the delivery rate of additive caused by fluctuations in a system for the preparation of a polyurethane reaction mixture from flowable reactants and an additive, in particular a blowing agent, are kept within negligible limits by subdividing the supply pipe (4) to the mixing head (6) into a main pipe (8) and a subpipe (9) and introducing the additive into the side stream, which is substantially smaller than the main stream.
    Type: Grant
    Filed: September 9, 1993
    Date of Patent: January 17, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Kurt Krippl, Wilfried Ebeling, Jurgen Fietz, Hans-Michael Sulzbach, Reiner Raffel, Ferdinand Althausen
  • Patent number: 5382648
    Abstract: The invention relates to a twisted nematic film comprising a non-crosslinked liquid-crystalline polymer having a Tg above 75.degree. C. and a rotational viscosity (.gamma.) of less than 5000 Pascal.seconds (Pa.s) between Tg and Tni. Such twisted nematic films are used in displays. The invention further relates to methods for the preparation of these twisted nematic films, to the use of said twisted nematic films for optical data storage and in writable compact disks and to a display device comprising such a twisted film.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: January 17, 1995
    Assignee: Akzo Nobel nv
    Inventors: Stephen J. Picken, Gustaaf R. Mohlmann
  • Patent number: 5380813
    Abstract: The present invention relates to a production method of lactic acid-based polyurethanes. In the first phase of the product ion, the monomeric lactic acid is polymerized into an oligomer, the molecular weight thereof being about 500 to 10,000. Next, the oligomer thus obtained is copolymerized with an isocyanate reacting with the free hydroxyl and carboxyl groups thereof into polyurethane with a high molecular weight. To make the oligomer react with diol prior to the copolymerization is unnecessary according to the invention. The lactic acid used need not be absolutely pure, and by modifying the process, various biodegradable end products can be obtained therefrom, which according to the invention are appropriate for the material of disposable packages, agricultural film or planting pots, or as a coating of fertilizer granules.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: January 10, 1995
    Assignee: Neste OY
    Inventors: Jukka Seppala, Johan-Fredrik Selin, Tao Su
  • Patent number: 5374667
    Abstract: The invention provides a method for the preparation of fluorochlorohydrocarbon(FCHC)-free polyurethane soft (molded) foam materials with low density, by reactingA) liquid polyisocyanate mixtures containing bound urethane groups, containing 22 to 30 weight percent of NCO groups, which in turn are prepared by reacting a mixture of diphenylmethane-diisocyanate and polyphenyl-polymethylene-polyisocyanates (raw MDI) with at least one polyoxypropylene-polyoxyethylene-polyol with a functionality between 2.5 and 3.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: December 20, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Hinz, Ruth Zschiesche, Heinz-Dieter Lutter, Bernd Bruchmann
  • Patent number: 5374704
    Abstract: The present invention is directed to pure polyurethanes which are biocompatible. These pure polyurethanes comprise the reaction product of:a) a pre-adduct containing NCO groups and comprising the reaction product ofi) a diisocyanate selected from the group consisting of aliphatic diisocyanates, cycloaliphatic diisocyanates, and mixtures thereof, withii) a macrodiol having a molecular weight of from 500 to 10,000 wherein said components i) and ii) reacted at temperatures of from 90.degree.-150.degree. C.
    Type: Grant
    Filed: December 14, 1993
    Date of Patent: December 20, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hanns-Peter Muller, Rolf Dhein, Herbert Hugl, Heinz Pudleiner
  • Patent number: 5374705
    Abstract: Polyether polyols are by reacting an alkylene oxide comprising propylene oxide with an initiator containing at least three active hydrogen atoms per molecule. The reaction is conducted in the presence of an alkoxylation catalyst which is barium, strontium and their oxides, hydroxides, hydrated hydroxides or monohydroxide salts, or mixtures thereof; and in the presence of from about 1 to about 10 weight percent, based on total weight of initiator, of a processing aid that is an organic monohydroxyl- or dihydroxyl-containing substance having a molecular weight of at least 30, or a mixture thereof. The processing aid enhances the ability to obtain polyether polyols having a reduced unsaturation content.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: December 20, 1994
    Assignee: The Dow Chemical Company
    Inventors: David E. Laycock, Robert A. Sewell
  • Patent number: 5373050
    Abstract: The present invention is directed to a self-emulsifiable isocyanate-terminated prepolymer, having an average NCO functionality of from 2.0 to 3.5, which is prepared from: (a) a polyisocyanate mainly composed of at least one of aliphatic polyisocyanates, alicyclic polyisocyanates, and aromatic polyisocyanates, (b-1) a hydrophilic surfactant having at least one active hydrogen group capable of reacting with an isocyanate group, and (b-2) an aliphatic compound of 8 or more carbons, and/or a fatty acid ester in which the total of the carbons of a starting fatty acid and a starting hydroxyl-group-having compound is 8 or more, the aliphatic compound and the fatty acid ester having at least one active hydrogen group capable of reacting with the isocyanate group.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: December 13, 1994
    Assignee: Nippon Polurethan Industry Co., Ltd.
    Inventors: Yukihiro Morikawa, Koichi Uehara, Shin Konishi
  • Patent number: 5373028
    Abstract: In a method of preparing a poly-urethane and/or -urea foam from a formulation including (a) a polyisocyanate, (b) an isocyanate-reactive component, and (c) a visible emissions producing component, wherein (a), (b) and (e) are reacted under reaction conditions sufficient to form a poly-urethane and/or -urea foam and the foam is then cooled, whereby visible emissions are emitted during cooling, an improvement comprising including in the formulation a visible emissions reducing agent, such that the amount of the visible emissions is reduced as compared with the amount emitted by a foam prepared from a formulation which does not contain the visible emissions reducing agent but which is otherwise substantially similar. Foams prepared therefrom exhibit reduction in visible emissions during the cure period, which is particularly evident when the foams are mechanically cooled. They also exhibit generally good physical properties.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: December 13, 1994
    Assignee: The Dow Chemical Company
    Inventors: Carl D. McAfee, Richard G. Skorpenske, Don H. Ridgway, Stephen K. Lewis, Eugene P. Wiltz, Jr.
  • Patent number: 5373029
    Abstract: Low-fog flexible polyester polyurethane foams are produced by reactinga) polyisocyanates, withb) polyesters containing at least two hydroxyl groups and having a molecular weight in the range from 400 to 10,000,in the presence ofc) water and/or readily volatile organic compounds as blowing agentswherein prior to reacting, the polyesters have been subjected to continuous distillation over an average holding time of 2 to 600 s, at a temperature of 160.degree. to 250.degree. C., and under a pressure of 0.05 to 10 mbar.The reaction mixture may optionally containd)compounds containing at least two active hydrogen atoms and having a molecular weight in the range from 32 to 400 as chain-extending and crosslinking agents, and/ore) auxiliaries and additives known per se.These low-fogging polyester polyurethane foams are extremely suitable for use in vehicles, preferably automobiles.
    Type: Grant
    Filed: November 18, 1993
    Date of Patent: December 13, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Naujoks, Klaus Konig, Manfred Schmidt, Hans-Walter Illger, Gunter Baatz, Hansjurgen Rabe
  • Patent number: 5373026
    Abstract: Disclosed is a method of insulating a surface or enclosure by applying to the surface or enclosure a polymeric foam structure of a polymer material and carbon black. The carbon black is generally uniformly dispersed in the polymer matrix in the form of discrete particles substantially free of agglomeration. A preferred carbon black is thermal black. The carbon black provides a number of advantages over those previously employed commercially. Further disclosed is a process for making the foam structure. Further disclosed is an extruded, insulative foam structure of the type described above.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: December 13, 1994
    Assignee: The Dow Chemical Company
    Inventors: Arnold M. Bartz, Martin K. Hitchcock
  • Patent number: 5373043
    Abstract: This invention relates to a solid particulate polymer comprising 1) a backbone containing (a) a plurality of moieties selected from the group consisting of alkylene, arylene, aralkylene, alkylarylene, cycloalkylene, alkyleneoxy, and polyalkyleneoxy; (b) a plurality of moieties selected from the group consisting of internal urea, thiourea, biuret and dithiobiuret; and 2) end groups selected from the group consisting of internal urea, thiourea, biuret and dithiobiuret. The particulate polymer dispersions can be used for preparing reinforced polymer matrices, especially where the matrix comprises urethane and/or urea linkages.The invention allows for the preparation of a particulate polymer without using organic polyisocyanate.
    Type: Grant
    Filed: August 19, 1993
    Date of Patent: December 13, 1994
    Assignee: The Dow Chemical Company
    Inventors: Robert F. Harris, Michael R. Savina, Michael D. Joseph
  • Patent number: 5371166
    Abstract: The present invention discloses a novel polyurethane composition useful as a dispersing binder. The binder yields magnetic dispersions having high gloss values. Moreover, the polyurethane provides excellent hydrolytic stability. The polyurethane comprises a polyol, a diisocyanate a chain extender and an functional modifier formed of a reaction product of an aminodiol and Bronsted Acid.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: December 6, 1994
    Assignee: The B. F. Goodrich Company
    Inventors: Julius Farkas, Dale R. Hall, Kyung J. Kim, Ravi R. Vedula
  • Patent number: 5369207
    Abstract: A process for the preparation of isocyanurate and urethane group-containing and, if desired, uretdiode and allophanate group-containing polyisocyanate mixtures by partially cyclizing organic, preferably (cyclo)aliphatic diisocyanates, in the presence of trimerization catalysts, deactivating these catalysts, reacting the partially trimerized, isocyanurate and, if desired, uretdiode group-containing polyisocyanate mixture with 0.5 to 10 mol % of at least one aliphatic or cycloaliphatic alcohol and/or polyoxyalkylene alcohol, and separating off the monomeric diisocyanates.
    Type: Grant
    Filed: July 12, 1993
    Date of Patent: November 29, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Stefan Wolff, Hans Renz, Guenter Mohrhardt
  • Patent number: 5369176
    Abstract: The present invention relates to a reaction injection molding process, to a composition utilized therein as well as to a kit of parts from which the composition can be obtained. In particular, the process includes the use of a composition which contains at least 70% of low molecular weight compounds which are capable of forming a crosslinked polymer. The first component of the composition is a compound with at least an ethylenic unsaturation and an isocyanate-reactive group. The second component of the composition contains an ethylenically unsaturated monomer capable of copolymerizing with the first component. The third component of the composition is a polyisocyanate. Polymerization of the first and second components takes places prior to the reaction between the first and third components.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: November 29, 1994
    Assignee: DSM N.V.
    Inventor: Adrianus De Koning
  • Patent number: 5367000
    Abstract: Rigid foams containing urethane and isocyanurate groups are obtained by using of mixtures of i) n-pentane and/or isopentane and ii) cyclopentane as blowing agents.
    Type: Grant
    Filed: January 24, 1994
    Date of Patent: November 22, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Wiedermann, Stephan Wendel, Ulrich Weber
  • Patent number: 5367050
    Abstract: A polyether polyol produced by using an N-amino-ethylpiperazine-ethylene oxide aduct as an initiator and addition-polymerizing an alkylene oxide thereto and having a molecular weight of about 2000 to 7000; a process for producing a flexible urethane foam starting with the above polyether polyol; a process suited for the production of a hot-cure urethane foam which comprises using the above polyether polyol with a hydroxyl value of 40 to 80 mg KOH/g and, as a blowing agent, 4.6 to 6.0 weight parts of water based on 100 weight parts of the polyol; and a process suited for the production of a cold-cure urethane foam which comprises using the above polyether polyol with a hydroxyl value of 23 to 50 mg KOH/g and, as a blowing agent, 2.5 to 5.0 weight parts of water on the same basis.
    Type: Grant
    Filed: February 16, 1994
    Date of Patent: November 22, 1994
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Yoshihiko Tairaka, Mitsuhiro Nishimura, Katsuhisa Kodama
  • Patent number: 5367045
    Abstract: A material for producing a pad cover molding polyurethane, comprsing a polyol, an isocyanate and an urethane reaction retarding catalyst comprising a tertiary amine blocked with an acid such as formic acid, said material containing neither any fluorocarbon nor any chlorofluorocarbon. The polyurethane material according to the present invention is capable of molding a non-foamed or sparsely foamed lacuna-free pad cover although the material contains neither any fluorocarbon nor any chlorofluorocarbon.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: November 22, 1994
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Masahiro Takimoto, Hisashi Mizuno, Shinji Jinushi
  • Patent number: 5360885
    Abstract: The present invention relates to the continuous production of polyurethane and polyurethane urea elastomers by reaction of polyisocyanates with isocyanate-reactive compounds in a mixing nozzle.
    Type: Grant
    Filed: December 7, 1993
    Date of Patent: November 1, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ernst Orthmann, Klaus Wulff, Peter Hoeltzenbein, Helmut Judat, Hans Wagner, Gottfried Zaby, Herbert Heidingsfeld
  • Patent number: 5360831
    Abstract: The present invention concerns a process for the preparation of foam-in-fabric articles useful in furniture and automotive applications such as car seats, arm seats and head rests. According to the present invention a flexible or semi-flexible foam formulation is frothed with a non-reactive gas when poured onto a foam hacking of a composite cover, and allowed to rise and cure.
    Type: Grant
    Filed: June 15, 1993
    Date of Patent: November 1, 1994
    Assignee: Polyol International B.V.
    Inventors: Werner A. Lidy, Gerard Gatouillat, Francois M. Casati
  • Patent number: 5356943
    Abstract: RIGID FOAMS, in particular, polyisocyanurate and polyurethene foams having improved fire and surface properties can be prepared by reacting a polymethylene polyphenyl polyisocyanate composition with a polyfunctional active hydrogen compound under foam-forming conditions, the polyisocyanate composition containing not more than 20% by weight of dyisocyanates and not more than 20% by weight of polyisocyanates containing more than 5 isocyanate groups per molecule.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: October 18, 1994
    Assignee: Imperial Chemical Industries PLC
    Inventors: Ernst O. Dueber, Berend Eling