Patents Represented by Attorney, Agent or Law Firm Aron Preis
  • Device for exchanging a die plate of a prilling tower and method for the automatic exchange
    Patent number: 6695991
    Abstract: A device for exchanging a die plate of a molten bisphenol A prilling tower is described. The device comprises: (a) at least two die plates; (b) a guide which is in contact with the die plates; and (c) a drive mechanism, wherein the drive mechanism moves the die plates linearly and serially between an operating position and an exchange position along the guide. Also described is a process of automated operation of the device at the top of a bisphenol A prilling tower.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: February 24, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Lanze, Günter Holdenried, Rainer Neumann, Frieder Heydenreich, Tony van Osselaer
  • Polycarbonate substrates
    Patent number: 6696542
    Abstract: Polycarbonate substrates, the preparation of which is based on 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexanone, and their use for producing shaped articles with particularly high purity and extremely high surface brilliance and also the shaped articles which can be produced from the polycarbonate substrate are described.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: February 24, 2004
    Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen, N.V.
    Inventors: Michael Bödiger, Steffen Kühling, Franky Bruynseels, Dirk van Meirvenne, René de Cleyn
  • Polyester polycarbonates of particular diphenols
    Patent number: 6696543
    Abstract: Polyestercarbonate resin is disclosed having a molecular structure that contains units derived from dicarboxylic acids and units derived from at least one diphenol selected from the group consisting of formula (IIa) and (IIb) in which R1 to R7 each independently of the others represents hydrogen, halogen, a C1- to C12-alkyl radical, a C6- to C19-aryl radical, a C7- to C12-aralkyl radical. Also disclosed are the processes for their preparation, and their use in the production of molded articles and extrudates.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: February 24, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Wehrmann, Helmut-Werner Heuer
  • Method and device for producing bisphenol a prills and bisphenol a prills produced according to this method
    Patent number: 6689464
    Abstract: A method for producing bisphenol A in prill form is disclosed. Molten bisphenol is top-fed into a prilling tower via a plate containing a plurality of nozzles. A gas coolant guided through a circuit is led into said tower in a counter flow direction. The prills are cooled to about room temperature, collected at the bottom of the tower and removed. Also disclosed is the device for carrying out the inventive method and the prills thus produced.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: February 10, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Lanze, Alfred Eitel, Rainer Neumann, Steffen Kühling, Frieder Heydenreich, Tony van Osselaer, Rainer Bellinghausen, Heiko Herold
  • Method and computer system for establishing a relationship between a stress and a strain
    Patent number: 6687624
    Abstract: The relationship between the stress &sgr; and the strain &egr; is firstly established in step 100 with short-term tests as a function of the temperature T. In steps 101 to 104, a Findley model is extended in such a way as to obtain a relationship between the strain &egr; and the stress &sgr; as a function of the time t and the temperature T. The two models are combined in steps 105 and 106, so as to obtain overall a relationship between the stress &sgr; and the strain &egr; as a function of the time t and the temperature T.
    Type: Grant
    Filed: March 27, 2002
    Date of Patent: February 3, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bahman Sarabi, Martin Wanders, Dietmar Wächtler, Andreas Wende
  • Flame-resistant polycarbonate ABS moulding compounds
    Patent number: 6686404
    Abstract: Flame-retardant thermoplastic moulding compositions containing an aromatic polycarbonate or polyestercarbonate, a graft polymer, a thermoplastic vinyl copolymer, a fluorinated polyolefin, 0.5 to 20 parts by weight of at least one phosphorus compound of general formula (I) wherein the average degree of polycondensation N of component D is always >5, a very finely divided inorganic powder with an average diameter of 0.1 to 200 nm and/or a monophosphorus compound, wherein the sum of the parts by weight of all the components is 100.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: February 3, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Michael Zobel, Dieter Wittmann, Nikolaus Janke
  • Preparation of functionalized alkoxyamine initiator and its use
    Patent number: 6686424
    Abstract: A one-pot process for the preparation of functional alkoxyamines of the general formula (I), is disclosed. The process entails (1) reacting an oxidizing agent with a sterically hindered secondary amine to produce an aqueous phase and a nitroxyl radical (2) removing the aqueous phase and adding to the nitroxyl radical one or more vinyl monomer(s) conforming to a formula and a system which produces free radicals. Also disclosed is a process of polymerizing monomers using the functional alkoxyamine.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: February 3, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christophe Detrembleur, Thomas Gross, Rolf-Volker Meyer
  • Polycarbonate containers
    Patent number: 6682794
    Abstract: A container made of polycarbonate resin is disclosed. The container is characterized in that the polycarbonate is prepared by the phase interface process that is characterized in that the aqueous solution of an alkali salt of a bisphenol used, contains dissolved oxygen in an amount less than 150 ppb. The process for making the container is also disclosed.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: January 27, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Horn, Steffen Kühling, Ralf Hufen, Rolf Lanze, Michael Prein, Rainer Neumann, Hermann Kauth, Frieder Heydenreich, Tony van Osselaer
  • Fluidised bisphenol dust
    Patent number: 6683223
    Abstract: A process for fluidizing bisphenol dust is disclosed. The process entails adding 0.1 to 10 parts by weight of water per 1 part by weight of bisphenol dust. Also disclosed is a process for preparing a bisphenol wherein the fluidized bisphenol dust according to the invention is introduced before, during or after reaction of a phenol with a carbonyl compound.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: January 27, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Bödiger, Rainer Neumann, Nikolai Kostyszyn, Rolf Lanze, Frieder Heydenreich, Michael Prein
  • Process for making a thermoplastic molding composition
    Patent number: 6683123
    Abstract: A process for producing a thermoplastic molding composition is disclosed. The process entails introducing a solid polymeric resin, optionally containing residual moisture, into an extruder, operating under conditions designed to melt the resin and charging water into the melt while in the extruder to yield wet, molten resin that contains water in an amount of at least about 2 percent. The wet, molten resin is then devolatilized to yield dry resin having water content not exceeding 0.3 percent. Molding compositions thus produced have improved properties. In a preferred embodiment, the process results in a molding composition that contains a fine dispersion of a discontinuous phase in a continuous polymeric phase.
    Type: Grant
    Filed: September 12, 2000
    Date of Patent: January 27, 2004
    Assignee: Bayer Polymers LLC
    Inventor: Henry A. Kozlowski
  • Molding materials
    Patent number: 6680350
    Abstract: A molding composition suitable for the preparation of glazing is disclosed. The composition contains a transparent thermoplastic polymer and a phthalocyanine or naphthalocyanine. Also disclosed is a method for preparing the composition.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: January 20, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventor: Martin Döbler
  • Continuous process for the production of carboxylic acid diaryl esters
    Patent number: 6680400
    Abstract: An improvement to the interfacial boundary process for continuous production of carbonic acid diaryl esters is disclosed. The process that entails a reaction of monophenols in an inert solvent, in the presence of an alkaline solution and a nitrogen base catalyst, is carried out in two stages. In the first stage phosgene, inert solvent and phenol in solution are combined to form a material system and a second stage the reaction to form carbonic acid diaryl ester is completed. The improvement comprising maintaining in the first stage a pH of 11.0 to 12.0 and a temperature below 40° C. and a pH of 7.5-10.5 and a temperature <50° C. in the second stage.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: January 20, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Alewelt, Steffen Kühling, Johan Vanden Eynde, Dirk Van Meirvenne
  • Compatible blend of polycarbonate with vinyl (co)polymer
    Patent number: 6670420
    Abstract: A compatible blend of polycarbonate resin with a vinyl (co)polymer blending partner is disclosed. The preparation of inventive blend comprise reactive blending of polycarbonate, a vinyl (co)polymer and a novel compatibilizer in the presence of a transesterification catalyst and under conditions of time and temperature designed to promote transesterification. The compatibilizer is the polymerized reaction product of at least one vinyl monomer that contains no hydroxy groups and a hydroxyl containing monomer conforming to (I) where R denotes H or C1-C4 alkyl, R1 denotes H, Cl, Br, C1-C4 alkyl, cyclohexyl, or C1-C4 alkoxy, a is 0 or 1, b is 0 or 1, c is 0 or 1, n is an integer of 0 to 4 and X is an OH group. The compatible blends of the invention are characterized by their improved properties.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: December 30, 2003
    Assignee: Bayer Corporation
    Inventors: Daniel H. Bolton, Pierre Moulinie, David M. Derikart, Nicanor Kohncke
  • Polycarbonates containing aspartic acid-ester functional silicones
    Patent number: 6664342
    Abstract: Aspartate-functional silicone and the process for its preparation is disclosed. Also disclosed are aromatic polycarbonate that contains the inventive aspartate-functional silicone, a process for its preparation and its use in making molded articles.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: December 16, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Burkhard Köhler, Klaus Horn
  • Flame-proof polyester molding compositions comprising hydrotalcite, red phosphorus and melamine cyanurate
    Patent number: 6649674
    Abstract: A flame-proof polyester molding compositions is disclosed. The composition that exhibits good flame-resistance, particularly in thin-walled moldings, contains red phosphorus, nitrogen-containing compounds and a small amount of a hydrotalcite. The composition is particularly suitable for the preparation of moldings, sheeting and fibers.
    Type: Grant
    Filed: June 24, 2002
    Date of Patent: November 18, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Wagner, Henricus Peerlings
  • Vinylcyclohexane-based polymers
    Patent number: 6649723
    Abstract: A molding composition comprising a (co)polymer of vinylcyclohexane is disclosed. The copolymer is characterized in having an absolute molecular weight Mw of 100,000 to 450,000 g/mol, polydispersity index of 1 to 3 and maximum melt viscosity of 1000 Pa·s, as measured at 300° C. and at a shear rate of 1000 sec−1. The composition is suitable for producing a variety of molded article most notably optical data storage media.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: November 18, 2003
    Assignees: Bayer Aktiengesellschaft, Teijin Ltd.
    Inventors: Volker Wege, Friedrich-Karl Bruder, Konstadinos Douzinas, Yun Chen
  • Production and use of polyester carbonates
    Patent number: 6646099
    Abstract: A transesterification process for producing polyester is disclosed. In a first stage of the process there is heated, in an inert gas atmosphere, a first mixture containing at least one dihydroxy compound and at least one diaryl carbonate to form an oligocondensate. In a second stage there is added to the oligocondensate at least one dicarboxylic acid to form a second mixture. The second mixture is heated to a temperature not higher than 290° C. in the presence of a quaternary onium compound as catalyst to form polyester carbonate. Hydroxyaryl formed throughout the process is distilled-off under reduced pressure.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: November 11, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Silke Kratschmer, Lothar Bunzel, Wolfgang Alewelt, Renate Wilms
  • Use of copolycarbonates
    Patent number: 6646101
    Abstract: The present invention provides the use of impact resistant, stress cracking resistant copolycarbonates with particularly good low temperature properties for applications in which particularly good low temperature properties are required, e.g., for automobile construction or external applications, and new copolycarbonates themselves.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: November 11, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Silke Kratschmer, Klaus Horn, Annett König, Rolf Wehrmann, Steffen Kühling
  • Thermoplastic molding compositions
    Patent number: 6646045
    Abstract: Thermoplastic molding compositions containing graft polymers produced with different initiator systems are disclosed. The compositions are distinguished by a combination of good toughness and reduced opacity. As a result, appreciably smaller quantities of pigment are needed to color the molding composition.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: November 11, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventor: Herbert Eichenauer
  • Thermoplastic molding compounds, provided with an antistatic agent which exhibit improved color stability during processing
    Patent number: 6639005
    Abstract: A thermoplastic molding composition that exhibits antistatic properties and improved color stability is disclosed. The composition contains a major amount of resinous component that contains A) 0 to 100 % by weight of one or more graft polymers B) 100 to 0 % by weight of a thermoplastic vinyl (co)polymer, and a minor amount of a mixture of a) a modified or unmodified polyalkylene ethers and b) a phenolic oxidant wherein the weight ratio (a):(b) is 20:1 to 1:1.
    Type: Grant
    Filed: October 12, 2001
    Date of Patent: October 28, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Willenberg, Herbert Eichenauer, Heinrich Alberts