Patents Represented by Attorney, Agent or Law Firm Aron Preis
  • Oligomeric bischlorocarbonic acid esters obtained from selected cycloaliphatic bisphenols and other bisphenols
    Patent number: 6590058
    Abstract: This invention relates to oligomeric bischloroformic acid esters which are obtainable, in a two-phase reaction, from selected cycloaliphatic bisphenols and other bisphenols by introducing phosgene.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: July 8, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Ebert, Burkhard Köhler, Yun Chen
  • Fluorescent, structured shaped bodies
    Patent number: 6584714
    Abstract: Optical display containing one or more shaped articles and a light source. The shaped articles consist of a transparent or semitransparent plastic. The plastic contains one or more fluorescent substances. One or more light sources are arranged in such a way that their light is applied to the surface of the shaped article at particular regions of it and propagates through the shaped article. The shaped article contains means for controlled light output, so that the light can be output from the shaped article in a controlled way at quite particular regions on the surface of the shaped article.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: July 1, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Wehrmann, Helmut-Werner Heuer
  • Use of copolycarbonates
    Patent number: 6586556
    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: September 24, 2001
    Date of Patent: July 1, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Silke Kratschmer, Klaus Horn, Annett König, Rolf Wehrmann, Steffen Kühling
  • Composition based on copolycarbonates
    Patent number: 6583257
    Abstract: The invention relates to thermoplastic copolycarbonate compositions and moulded parts containing the latter having improved stress cracking resistance and thermal stability.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: June 24, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Holger Warth, Thomas Eckel, Dieter Wittmann, Silke Kratschmer
  • Flame resistant thermostable polycarbonate ABS moulding compounds
    Patent number: 6583204
    Abstract: Thermoplastic moulding composition comprising at least 2 components chosen from the group consisting of 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., thermoplastic vinyl (co)polymer and polyalkylene terephthalate and 0.5 to 20 parts by wt. phosphorus compound of the general formula (I).
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: June 24, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Jörn Stölting, Michael Zobel
  • Process for the preparation of superabsorbent polymers from polyacrylonitrile precipitation polymers
    Patent number: 6573358
    Abstract: A process for the preparation of superabsorbers is disclosed. The process entails subjecting a polyacrylonitrile precipitation polymer alkaline hydrolysis to obtain a hydrolysis product. The hydrolysate that may optionally be neutralized is dried and ground and optionally modified by crosslinking of its surface. The inventive superabsorber is suitable for the preparation of nappies, incontinence articles, water-storage materials and electric cable coverings.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: June 3, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gisbert Michels, Günter Sackmann, Klaus Struss
  • Flame and stress crack resistant polycarbonate molding compositions
    Patent number: 6569930
    Abstract: A flame resistant thermoplastic molding composition is disclosed. The composition contains aromatic polycarbonate, graft polymer, a specifically structured phosphorous compound, fluorinated polyolefin and inorganic compound with an average particle size no greater that 200 nm and an optional vinyl(co)polymer. The inventive composition is characterized in its improved stress cracking resistance and mechanical properties.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: May 27, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Michael Zobel, Bernd Keller, Heinrich Alberts
  • Flame-resistant thermostable polycarbonate ABS moulding materials
    Patent number: 6566428
    Abstract: A flame-resistant, thermoplastic molding composition characterized by its improved stress cracking resistance, notched impact strength and heat resistance is disclosed. The composition contains A) an aromatic polycarbonate or polyestercarbonate, B) a graft polymer of B.1 5 to 95 wt. % of one or more vinyl monomers on B.2 5 to 95 wt. % of one or more graft substrates with a glass transition temperature below 10° C. and an average particle size (d50 value) of 0.05 to 5 &mgr;m, C) 0 to 50 parts by weight of a thermoplastic vinyl copolymer, D) 0.5 to 20 parts by weight of at least one phosphorus compound of the general formula (I) and optionally at least one further phosphorus compound which differs from compounds of the formula (I), and E) 0.05 to 5 parts by weight of a fluorinated polyolefin.
    Type: Grant
    Filed: February 7, 2000
    Date of Patent: May 20, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Eckel, Dieter Wittmann, Michael Zobel, Heinrich Alberts
  • Method of producing branched polyamides
    Patent number: 6566486
    Abstract: A process for the production of polyamides is disclosed. In a first reaction step, suitable monomers such as caprolactam or an aliphatic aminocarboxylic acid are reacted with polyfunctional amines, which contain at least one secondary amino group, and/or with salts containing such amines and dicarboxylic acids. The reaction product is in a further process step undergoes solid phase post-condensation.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: May 20, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Detlev Joachimi, Hans-Jürgen Dietrich, Heinrich Morhenn, Cliff Scherer, Andreas Gittinger, Friedrich-Karl Bruder
  • Non-glossing thermoformed film
    Patent number: 6565787
    Abstract: A process of calendering a sheet or a film having at least one textured surface entailing passing a web of polymeric resin through a nip between a rigid roll and a resilient roll is disclosed. The inventive process comprises slowing down the cooling rate of the web by rolling its textured surface about the resilient roll. The rate of cooling is in comparison to a corresponding process where the web is rolled about said rigid roll. Products thus produced are suitable for making thermoformed articles having low gloss.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: May 20, 2003
    Assignee: Bayer Corporation
    Inventors: Larry D. Sarver, Antonio A. Diaz
  • Mouldings of thermoplastic polyurethanes exhibiting reduced fogging
    Patent number: 6559267
    Abstract: A moulded article comprising thermoplastic polyurethane (TPU) that exhibits reduced fogging is disclosed. Characterized in having condensate value of <2 mg/10 g of TPU in accordance with the fogging test of DIN 75201B, the TPU is the product of reacting A) an organic diisocyanate, with B) polyester polyol that contains less than 0.2% of 1:1 ring esters of dicarboxylic acid and diol and C) a chain extender. The moulded article is particularly suitable for use in the automotive sector.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: May 6, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Kaufhold, Hans-Georg Hoppe, Wolfgang Röhrig
  • Foodstuffs skin based on cellulose with reinforced adhesion to minced meat and a process for its preparation
    Patent number: 6558719
    Abstract: A foodstuffs skin based on cellulose with a water vapor impermeable layer on the outer surface and a coating consisting of at least two components on the inner surface is disclosed. The coating which reinforces adhesion to minced meat contains a cross-linked polyaminoamide/-epichlorhydrin resin, and wax as well as an optional synthetic polymer. A process for preparing these foodstuffs skins and their use for the production of sausages for boiling and/or simmering is also described.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: May 6, 2003
    Assignee: Wolff Walsrode AG
    Inventors: Klaus Blumenberg, Willi Neuschulz
  • Aliphatic thermoplastic polyurethanes, a process for producing them and the use thereof
    Patent number: 6559266
    Abstract: A molding composition comprising thermoplastic polyurethane is disclosed. The polyurethane is characterized in having ultimate tensile strength (UTS) and elongation at break (EAB) values after hot storage which are, each, at least 60% of the corresponding value before hot storage, glass transition temperature equal to or lower than −50° C., UTS and EAB values after hydrolytic storage which are, each, at least 80% of the corresponding value before hydrolytic storage, and Shore A hardness of 70 to 95. The polyurethane is a product of a reaction comprising an aliphatic diisocyanate, a mixture of polyols and a chain extender and contains a UV stabilizer, an antioxidant and an optional anti-hydrolysis agent.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: May 6, 2003
    Assignees: Bayer Corporation, Bayer Aktiengesellschaft
    Inventors: Wolfgang Kaufhold, Wolfgang Braeuer, Hans-Georg Wussow, Hans-Georg Hoppe, Steven C. Manning
  • Thermoplastic resins having incorporated mold release agents
    Patent number: 6552153
    Abstract: A mixture of hydroxy-terminated hydrocarbons useful as a mold release agent for polymers is disclosed. The polymers suitable in the present context are the ones prepared by polyaddition or polycondensation, in particular, thermoplastic polyurethane and polyurethane urea.
    Type: Grant
    Filed: July 20, 1999
    Date of Patent: April 22, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Kaufhold, Friedemann Müller, Wolfgang Bräuer, Hans-Georg Hoppe, Hans-Georg Wussow
  • Composite consisting of a coated polycarbonate and a polymer
    Patent number: 6548146
    Abstract: A composite plastic structure is described. The composite structure includes: (a) a shaped polycarbonate article having an edge region, the edge region having an adhesion-promoting geometric feature therein; (b) a coating applied to the surface of the shaped polycarbonate article; and (c) a polymer that is injection-molded or cast over the edge region of the shaped polycarbonate article. The polymer (c) envelopes the adhesion-promoting geometric feature of the shaped polycarbonate article (a). The envelopment of the adhesion-promoting geometric feature by the polymer (c) provides a structurally firm connection between the shaped polycarbonate article (a) and the polymer (c). Also described is a method of preparing the composite structure, and composite structures according to the present invention, such as picture frames, slide frames, windows having a seal or frame, and a glazing for a motor vehicle.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: April 15, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Bier, Peter Capellen
  • Polyurethane prepolymers having alkoxysilane end groups, method for the production thereof and their use for the production of sealants
    Patent number: 6545087
    Abstract: This invention relates to polyurethane prepolymers which comprise alkoxysilane terminal groups and which are based on special, very high molecular weight polyurethane prepolymers, to a method of producing them and to their use as binders for low-modulus sealing materials.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: April 8, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lutz Schmalstieg, Ralf Lemmerz, Marie-Helene Walter, Oswald Wilmes
  • Multilayer, biaxially stretched, high-barrier plastic skin
    Patent number: 6541087
    Abstract: A multilayerd, biaxially stretched tubular film having the following sequence of layers, |A|B|C|D|E|F|G|, is described. Inner layer A contains at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Core layer E, consists essentially of at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Outer layer G contains at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Interlayer C is polyolefinic, has water vapor barrier properties, and is interposed between inner layer A and core layer E. Interlayer C is directly attached to layer A via coupling layer B and to layer E via coupling layer D. Coupling layers B and F each independently contain a modified polyolefin.
    Type: Grant
    Filed: September 11, 2000
    Date of Patent: April 1, 2003
    Assignee: Wolff Walsrode AG
    Inventors: Dirk Pophusen, Nils Schröder
  • Method for evaporating polymer solutions of thermoplastic polymers
    Patent number: 6534619
    Abstract: This invention relates to a multistep process for evaporating polymer solutions of thermoplastic polymers and for removing volatile constituents from thermoplastic polymers by indirect heat exchange. The invention relates in particular to a process for evaporating volatile constituents out of polymer solutions using shell-and-tube heat exchangers having a special geometry, coiled-tube evaporators and extrusion evaporators.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: March 18, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Thomas Elsner, Jürgen Heuser, Klemens Kohlgrüber, Christian Kords
  • Continuous process for producing carbonic acid diaryl ester
    Patent number: 6531623
    Abstract: A two stage interfacial polycondensation process for the production of carbonic acid diaryl ester is disclosed. The invention concerns an improvement to the process that entails forming in a first stage a reaction mixture that contains an inert solvent, at least one monophenol, phosgene, and aqueous alkali hydroxide solution, passing said reaction mixture to a second stage through at least one constriction at a velocity of 3 to 15 m/s under conditions designed to expose the mixture to a pressure drop of 0.1 to 2.5 bar, and in said second stage passing said mixture through at least one dispersing element at a velocity of 2 to 10 m/s under conditions designed to expose the mixture to a pressure drop of 0.1 to 0.5 bar. The resulting product is characterized by its purity and suitability for the manufacture of polycarbonates in the melt transesterification process.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: March 11, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Chrisochoou, Steffen Kühling, Johan Vanden Eynde
  • Process for preparing extrusion grade ABS polymer
    Patent number: 6528591
    Abstract: A continuous mass polymerization process for making an extrusion grade ABS resin having desirable properties and suitable for making refrigerator liners is disclosed. The process comprise charging a reaction mixture into a first in a series of reactors under conditions promoting polymerization, the mixture comprising diene rubber, a mixture of monomers, inert solvent and a chemical initiator to form a reaction mixture. The mixture is then transferred into a subsequent reactor operating at a temperature of 130 to 155° C. with no addition of chemical initiator and the resulting product is then devolatilized. The ABS thus produced contains about 10 to 16 pbw of dispersed rubber particles having an average particle diameter of 0.3 to 0.7 microns.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: March 4, 2003
    Assignee: Bayer Corporation
    Inventors: Terry L. Virkler, Wan C. Wu