Patents Represented by Attorney, Agent or Law Firm Aron Preis
  • Energy absorber for absorbing impact energy
    Patent number: 6730386
    Abstract: An extruded polycarbonate article suitable as an energy absorber is disclosed. The article includes a plurality of honeycomb chambers that are aligned substantially in the same direction, extend in the direction of the extrusion and are disposed adjacent to one another. A method of using the article entails aligning the honeycomb chambers in a direction parallel to the direction of the impact energy.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: May 4, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Kurt-Rainer Stahlke, Roland Brambrink
  • Device for mixing and reacting multiphase gaseous and liquid mixtures and use of this device
    Patent number: 6726354
    Abstract: A device for mixing and reacting multiphase gaseous and liquid mixtures is disclosed. The device comprise in sequence a first inflow cylindrical space, at least one cylindrical chamber tapering towards said cylindrical space, a second cylindrical space positioned perpendicularly to said first cylindrical space, and an outflow space. Also disclosed is a method of using the device, in particular in the interfacial process for preparing diphenyl carbonates or polycarbonates.
    Type: Grant
    Filed: August 8, 2001
    Date of Patent: April 27, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Werner Breuer, Frieder Heydenreich, Günter Jeromin, Helmut Judat
  • Process for the preparation of organic solutions
    Patent number: 6727393
    Abstract: A process for the preparation of a solution of a quaternary cation and an anion from a deprotonated hydroxy aromatic in an organic solvent by means of a reactive extraction of a quaternary salt in the presence of an aqueous hydroxide solution, a hydroxy aromatic and an organic solvent is disclosed. Also disclosed is a process for the recycling of a quaternary salt phenolate solution from a reaction mixture.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: April 27, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Claus-Peter Reisinger, Sven Michael Hansen, Peter Fischer, Michael Traving
  • ABS compositions having improved combinations of properties
    Patent number: 6727319
    Abstract: A thermoplastic molding composition having an improved profile of properties is disclosed. The composition contains A) a graft rubber that is a product of free-radical emulsion polymerization of vinyl monomers in the presence of rubber a) that is present in latex form and having a glass transition temperature below 0° C., using at least one peroxydisulfate compound as an initiator, and B) a graft rubber that is a product of free-radical emulsion polymerization of vinyl monomers in the presence of at least one rubber b) that is present in latex form and having a glass transition temperature below 0° C.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: April 27, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventor: Herbert Eichenauer
  • Moulded bodies made of thermoplastic polyurethane containing an active substance
    Patent number: 6723333
    Abstract: The invention provides moulded items made from thermoplastic polyurethanes (TPUs), in particular medical articles such as central venous catheters which contain a homogeneous distribution of antibiotic substances, a process for the preparation thereof and preparation of the active substance-containing TPUs.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: April 20, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Albers, Ralf Dujardin, Heinz Pudleiner, Joachim Simon, Günther Eberz, Wolfgang Kreiss, Christina Krasemann-Sharma
  • High-purity polymer granules and method for the production thereof
    Patent number: 6720406
    Abstract: A process for producing polymer pellets is disclosed. The process that is particular suitable for making polycarbonate pellets entails extruding a polymer melt, cooling the extrudate by contacting it with a cooling fluid and pelletizing the solidified polymer. The process is characterized in that the cooling fluid has a solids particle content of at most 10 ppm.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: April 13, 2004
    Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen N.V.
    Inventors: Thomas Elsner, Jürgen Heuser, Christian Kords, Steffen Kühling, Paul Viroux
  • Working up of polymer synthesis solutions
    Patent number: 6716933
    Abstract: The present invention relates to a process for working up solutions of polymers in organic solvents contaminated by alkaline constituents, using homogeneously soluble acids, especially by the introduction of an acid gas, and subsequent washing, and to the polymers so obtainable, which are distinguished by the fact that, on treatment with moist heat (sterilisation), only few defects caused by decomposition are formed, to the use thereof in the production of extrudates and molded specimen, and to the extrudates and molded specimen produced from those polymers themselves.
    Type: Grant
    Filed: July 16, 2002
    Date of Patent: April 6, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Alewelt, Wolfgang Ebert, Thomas Fritz, Dirk Jahn, Stefan Westernacher, Frank Bruynseels, Johann Rechner
  • Thermoplastic molding materials based on particular graft rubber constituents
    Patent number: 6716916
    Abstract: A molding composition containing a graft polymer is disclosed. The graft is a product of a free-radical emulsion polymerization of resin-forming vinyl monomers in the presence of rubber present in latex form having a glass transition temperature of ≦0° C. using an initiator combination comprising a persulfate compound and a redox initiator system. The process for preparing the graft polymer entails adding the persulfate compound at the beginning of the graft polymerization reaction and a later addition of the redox initiator. The composition that features good gloss and flowability is suitable for the preparation of molded articles.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: April 6, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Liqing-Lee Sun, Herbert Eichenauer, Heinrich Alberts
  • Flame-resistant and heat-resistant polycarbonate compositions
    Patent number: 6713544
    Abstract: Compositions containing: I. at least two components selected from the group comprising aromatic poly(ester) carbonates, graft polymers of one or more vinyl monomers on one or more graft bases having a glass transition temperature of <10° C., a thermoplastic vinyl (co)polymer, or poly(alkylene terephthalate) as well as II. 0.5 to 25 parts by weight of a mixture of phosphorus compounds of the general formula (I) with the proviso that the composition contains at least 2 phosphorus compounds of the formula (I) in which X or one or more radicals R1, R2, R3 and R4 is/are different and wherein the sum of the parts by weight of the components is 100.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: March 30, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Andreas Seidel, Dieter Wittmann, Uwe Peucker
  • Compositions containing polycarbonate
    Patent number: 6713181
    Abstract: A thermoplastic molding composition is disclosed. The composition that contains a polymer selected from the group consisting of a polycarbonate, a transparent polycarbonate-polyester-blend, a copolyestercarbonate and a transparent polyester and a compound of formula (I) and one or more compounds of formula (II) wherein a is 1 to 17, b is 0 to 16, c is 6 to 14, d is 3 to 7, e is 6 to 14, f is 3 to 7, g is 5 to 40 and a+b is 9 to 25 and n is 1 to 10, was found to be especially suitable for co-extrusion applications.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: March 30, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rüdiger Gorny, Siegfried Anders, Wolfgang Nising, Wolfgang Ebert
  • Polycarbonate with high extensional viscosity
    Patent number: 6713594
    Abstract: A thermoplastic molding composition that contains a polycarbonate resin having specific extensional Theological properties is disclosed. The composition is particularly suitable for preparing containers.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: March 30, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Horn, Ralf Hufen, Markus Krieter, Dirk-Jacques Dijkstra, Jens Hepperle, Helmut Münstedt
  • Method for producing phosphonium phenolates
    Patent number: 6710153
    Abstract: A process for the production of phosphonium phenolates is disclosed. The process entails reacting a phosphonium halide and phenol in an aqueous alkaline solution.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: March 23, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lothar Bunzel, Uwe Hucks, Annett König, Silke Kratschmer
  • Solid particles
    Patent number: 6710152
    Abstract: Solid particles containing 10 to 90 parts by weight of a dihydroxy compound and 10 to 90 parts by weight of a carbonic acid ester are disclosed. Also disclosed is a process for the production of these particles, an apparatus suitable for the process and a method for their use in production of polycarbonate by transesterification of carbonic acid esters with dihydroxy compounds.
    Type: Grant
    Filed: May 2, 2002
    Date of Patent: March 23, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Lanze, Michael Prein, Uwe Hucks
  • Polycarbonate substrates
    Patent number: 6710154
    Abstract: A method for producing polycarbonate based on 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethyl cyclohexanone and 4,4-(metaphenylene diisopropyl) diphenol is disclosed. The method is characterized in that the recovery and/or further processing of the polycarbonate is performed at temperatures below 290° C. The polycarbonate thus produced has high purity and high transmission and is suitable for the manufacture of optical data stores.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: March 23, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Tony van Osselaer, Steffen Kühling, Paul Viroux, Hugo Plompen, Richard Vansant
  • Flame-resistant polycarbonate moulding materials which are dimensionally stable at high temperatures and have high flow line strength
    Patent number: 6706788
    Abstract: Flame-resistant, thermoplastic moulding compositions containing A) 70 to 98 parts by weight of an aromatic polycarbonate, B) 0.5 to 20 parts by weight of a graft polymer, C) 0.5 to 5 parts by weight of a mixture of C.1) 10 to 90 parts by weight, based on C, of a monophosphorus compound of formula (I) C.2) 90 to 10 wt. %, based on C, of a phosphorus compound of formula (II) D) 0.05 to 5 parts by weight of a fluorinated polyolefin with an average particle diameter of 0.05 to 1000 &mgr;m, a density of 1.2 to 2.3 g/m3 and a fluorine content of 65 to 76 wt. %.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: March 16, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Michael Bödiger, Dieter Wittmann, Heinrich Alberts, Klaus Horn
  • Polycarbonate molding compounds with good demolding properties and molded bodied and semifinished products produced from the same
    Patent number: 6706797
    Abstract: A thermoplastic molding composition comprising polycarbonate resin having improved mold release properties is disclosed the composition contain polycarbonate resin and 0.005 to 5.0% relative to the weight of the composition of at least one hydrocarbon in the form of C15-600-methyl-branched alkane. The hydrocarbon is characterized in that the weight proportion of its branches is 5 to 30 percent relative to the weight of carbons in the alkane chain.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: March 16, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Ebert, Ralf Kaufmann, Christoph Schwemler, Wilfried Haese, Peter Fischer, Martin Döbler, Joachim Genz
  • Method for producing polycarbonate
    Patent number: 6706848
    Abstract: A process for producing polycarbonate is disclosed. The process entails transesterification of at least one carbonic ester with a mixture that contains dihydroxyl compound and phenol. The amount of bisphenol A in the mixture is 10 to 100 mol % relative to the amount of dihydroxyl compound and phenol is present in the mixture in an amount of 0.1 to 200% relative to the weight of bisphenol A.
    Type: Grant
    Filed: May 10, 2002
    Date of Patent: March 16, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Prein, Uwe Hucks, Rolf Lanze
  • Process for producing polycarbonate
    Patent number: 6703473
    Abstract: An improvement to the melt transesterification reaction of diaryl carbonate with dihydroxy aryl compound is disclosed.
    Type: Grant
    Filed: January 2, 2002
    Date of Patent: March 9, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Hucks, Kaspar Hallenberger, Silke Kratschmer, Michael Prein, Steffen Kühling
  • Process and device for extracting polyamide
    Patent number: 6699962
    Abstract: A process for removing low molecular weight constituents from polyamide 6 or from copolyamides based on caprolactam (herein (co)polyamide) is disclosed. The process comprise subjecting the (co)polyamide to liquid-extraction at a temperature which is above the boiling point of the liquid at atmospheric pressure said liquid containing water in an amount of at least 80 percent relative to its weight.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: March 2, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinrich Haupt, Dieter Göbbels, Konrad Triebeneck, Andreas Gittinger
  • Polycarbonate having a low shear thinning behavior
    Patent number: 6699959
    Abstract: A melt-polymerized polycarbonate is disclosed. The polycarbonate has a shear thinning ratio (y) that is defined by the limiting values of the following equation c+axb>y>−c+axb  (Q) wherein y≧1, c=0.3 to 0.1, b=14.831±0.05 to 0.02, a=0.1262±0.005 to 0.003 and x is the relative viscosity of the polycarbonate. The polycarbonate exhibits a flow behavior similar to that of a linear polycarbonate of comparable molecular weight obtained by the interface polymerization process.
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: March 2, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: James Mason, Silke Kratschmer, Uwe Hucks