Patents Represented by Attorney, Agent or Law Firm Aron Preis
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Patent number: 6784278Abstract: The use of phenols having a branched structure as terminal groups in polycarbonates, polyester carbonates and polyesters is disclosed. Also disclosed are polycarbonates, polyester carbonates and polyesters having such branched terminal groups, the process for their production and molded parts made therefrom.Type: GrantFiled: June 11, 2002Date of Patent: August 31, 2004Assignee: Bayer AktiengesellschaftInventors: Helmut-Werner Heuer, Rolf Wehrmann, Alexander Meyer, Harald Pielartzik, Friedrich-Karl Bruder, Jos M. J. Paulusse
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Patent number: 6784232Abstract: A thermoplastic molding composition that contains a resinous blend with phosphonate amine is disclosed. The resinous blend contains polycarbonate and a graft polymer having a graft substrate rubber selected from among silicone, EP(D)M and acrylate rubbers. The composition exhibits exceptional flame resistance and good mechanical properties such as stress cracking resistance and ease of flow while exhibiting high heat resistance.Type: GrantFiled: February 27, 2002Date of Patent: August 31, 2004Assignee: Bayer AktiengesellschaftInventors: Michael Zobel, Thomas Eckel, Torsten Derr, Dieter Wittmann
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Patent number: 6780515Abstract: A heat-absorbing system comprising at least a first layer (A) containing a ultraviolet absorber, a second layer (B) containing an organic infrared absorber and ultraviolet absorber and a third, interference layer (C) reflecting in the infrared range is disclosed. The system is suitable for shielding plastic glazing elements from heat radiation.Type: GrantFiled: April 8, 2002Date of Patent: August 24, 2004Assignee: Bayer AktiengesellschaftInventor: Martin Döbler
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Patent number: 6780905Abstract: A thermoplastic molding composition having good flame retarding properties and thermal stability is disclosed. The composition contains A) one or more members selected from the group consisting of polyester, polycarbonate and polyester-carbonate, B) a flame retardant component containing a nitrogen compound and a phosphorus compound C) zinc sulphide and optional functional additives and fillers and/or reinforcing agents. The composition is suitable for the preparation molded articles, sheeting or fibers.Type: GrantFiled: June 24, 2002Date of Patent: August 24, 2004Assignee: Bayer AktiengesellschaftInventors: Matthias Bienmüller, Michael Wagner
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Patent number: 6780281Abstract: A strand devolatilizer that includes a degassing container, a product inlet, a product distributor, a product outlet and a vapor outlet is disclosed. The product distributor is in the form of a tube distributor with at least one distributor tube (1) and a plurality of die tubes (2) arranged in parallel, each containing a plurality of apertures (15) in the tube wall. The die tubes (2) are preferably arranged in several planes one above the other and staggered laterally relative to one another.Type: GrantFiled: May 22, 2002Date of Patent: August 24, 2004Assignee: Bayer AktiengesellschaftInventors: Thomas Elsner, Jürgen Heuser, Christian Kords, Klemens Kohlgrüber
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Patent number: 6780473Abstract: A process for the preparation of a plastic composite is disclosed. The composite contains a first fluoropolymer layer, a second, middle layer of polycarbonate and a third layer of ethylene-vinyl acetate copolymer. The process entails preparing a plastics composite of fluoropolymer and polycarbonate layers and applying the layer of ethylene-vinyl acetate copolymer to the polycarbonate layer.Type: GrantFiled: February 25, 2002Date of Patent: August 24, 2004Assignee: Bayer AktiengesellschaftInventors: Jürgen Röhner, Klaus Zander, Rüdiger Gorny, Marco Roelofs
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Patent number: 6774166Abstract: A thermoplastic molding composition that features a combination of good notched impact strength and thermoplastic processability is disclosed. The composition contains one or more thermoplastic (co)polymers, a graft polymer and a combination of at least 3 components chosen from a compound (I) having at least one structural unit conforming to where M=a metal, and n=the valence of the metal M, and a compound (II) having at least one structural unit conforming to and a compound (III) having at least one structural unit conforming to and a compound (IV) that contains none of the structural units of (I), (II) and (III).Type: GrantFiled: December 7, 2001Date of Patent: August 10, 2004Assignee: Bayer AktiengesellschaftInventors: Herbert Eichenauer, Edgar Leitz
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Patent number: 6770731Abstract: A branched melt-polymerized polycarbonate having pronounced non-Newtonian flow behavior is disclosed. The polycarbonate is suitable for preparing molding compositions and the preparation of a variety of molded articles.Type: GrantFiled: March 22, 2002Date of Patent: August 3, 2004Assignee: Bayer AktiengesellschaftInventors: James Mason, Silke Kratschmer, Uwe Hucks
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Patent number: 6767986Abstract: A process for the production of high molecular weight aliphatic polycarbonates is disclosed. The process entails a first stage wherein a low molecular weight aliphatic polycarbonate is prepared and a second stage where the low molecular weight aliphatic polycarbonate is condensed with diaryl carbonate in a melt transesterification process to form a high molecular weight aliphatic polycarbonate. The resulting high molecular weight aliphatic polycarbonate is suitable for the production of extrudates, films and molded articles.Type: GrantFiled: April 22, 2003Date of Patent: July 27, 2004Assignee: Bayer AktiengesellschaftInventors: Melanie Moethrath, Lothar Bunzel, Hans Deml, Wolfgang Ebert
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Patent number: 6767964Abstract: A thermoplastic molding composition that features constancy of properties, especially toughness and processability is disclosed. The composition contains a first graft rubber polymer that is a product of emulsion polymerisation of styrene and acrylonitrile in the presence of a butadiene polymer latex (A) with a mean particle diameter d50 of 80 to 220 nm, a second graft rubber polymer obtained by emulsion polymerisation of styrene and acrylonitrile in the presence of a butadiene polymer latex (B) with a mean particle diameter d50 of 340 to 480 nm, and a rubber-free copolymer of styrene and acrylonitrile. Importantly, the butadiene polymer latex (A) is the product of seed polymerization using a seed latex with a mean particle diameter of 10 to 100 nm, and the butadiene polymer latex (B) is the product of seed polymerisation using the butadiene polymer latex (A) as seed latex.Type: GrantFiled: August 16, 2002Date of Patent: July 27, 2004Assignee: Bayer AktiengesellschaftInventors: Herbert Eichenauer, Adolf Schmidt, Ulrich Jansen
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Patent number: 6767962Abstract: A thermoplastic molding composition that contains a plurality of graft rubbers is disclosed. A first graft rubber is a product of emulsion polymerization of a mixture containing styrene and acrylonitrile in the presence of butadiene polymer latex (A) having an average particle diameter (d50) of 80 to 220 nm. An additional graft rubber is a product of emulsion polymerization of a mixture containing styrene and acrylonitrile in the presence of butadiene polymer latex (B) having an average particle diameter (d50) of 350 to 650 nm. The butadiene polymer latex (A) is the product of seed polymerization in which seed is butadiene polymer latex having a median particle diameter of 10 to 100 nm, and the butadiene polymer latex (B) is the product of agglomeration in which butadiene polymer latex (A) is the starting latex.Type: GrantFiled: July 26, 2002Date of Patent: July 27, 2004Assignee: Bayer AktiengesellschaftInventors: Herbert Eichenauer, Vera Buchholz, Eckhard Wenz
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Patent number: 6767944Abstract: A flame retardant, chemical and impact resistant, thermoplastic molding composition is disclosed. The composition that contains (A) an aromatic polycarbonate and/or polyester carbonate, (B) a graft polymer, (C) an oligophosphate conforming to a specific formulaEINBETTEN, (D) an anti-drip agent, and (E) a polyhydroxy ether is suitable for preparing molded articles.Type: GrantFiled: February 21, 2002Date of Patent: July 27, 2004Assignee: Bayer AktiengesellschaftInventors: Michael Zobel, Andreas Seidel, Thomas Eckel, Torsten Derr, Dieter Wittmann
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Patent number: 6767963Abstract: A thermoplastic molding composition of the ABS type is disclosed. The composition that contains an elastic-thermoplastic graft polymer and a copolymer comprising styrene and acrylonitrile, is characterized in that the graft polymer is a product of radical emulsion polymerization process that is initiated by a combination of a persulfate compound and at least one azo compound and in that a first mixture that contains said azo compound and a first amount of monomers is fed in to a rubber in latex form and in a subsequent reaction step a second mixture is introduced that contains the persulfate compound and a second amount of monomers.Type: GrantFiled: January 8, 2001Date of Patent: July 27, 2004Assignee: Bayer AktiengesellschaftInventor: Herbert Eichenauer
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Patent number: 6765047Abstract: A method for microencapsulating red phosphorus in polymerized urea resorcinol formaldehyde resin is disclosed. The method entails (i) preparing an aqueous mixture containing urea, resorcinol and formaldehyde, (ii) adding hexamethylene tetramine and optionally water to the mixture to yield a stabilized mixture (iii) dispersing red phosphorus in the to the stabilized mixture (iv) adding acid to the reaction mixture, and (v) collecting the resulting encapsulated red phosphorus. The product is suitable as flame retarding agent in molding compositions.Type: GrantFiled: May 24, 2002Date of Patent: July 20, 2004Assignee: Bayer AktiengesellschaftInventors: Henricus Peerlings, Michael Wagner, Wolfgang Podszun
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Patent number: 6762228Abstract: An impact-resistant modified, flame-resistant and mineral-reinforced polycarbonate composition is disclosed. The composition has a flow line strength of greater than 6 kJ/m2 measured according to ISO 179/IeU and is preferably reinforced with wollastonite.Type: GrantFiled: January 22, 2002Date of Patent: July 13, 2004Assignee: Bayer AktiengesellschaftInventors: Andreas Seidel, Thomas Eckel, Uwe Peucker, Dieter Wittmann
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Patent number: 6756439Abstract: A glass fiber reinforced thermoplastic molding composition suitable for the preparation of articles having good surface properties is disclosed. The composition contains a resinous blend and a filler component. The resinous blend contains (i) to 50 wt. % of a grafted acrylate rubber, (ii) 2 to 10 wt. % of a first copolymer containing structural units derived from styrene (meth)acrylonitrile and maleic anhydride, (iii) 20 to 80 wt. % polyamide, and (iv) 0 to 40 wt. % of a second copolymer containing structural units derived from styrene and (meth)acrylonitrile, the percents being relative to the total amount of (i), (ii), (iii) and (iv). The filler component of the inventive composition contains 5 to 50 percent of milled glass fibers, the percent being relative to the weight of the molding composition. Optionally, the inventive composition also contains a positive amount of a wollastonite. Molded articles that are prepared of the composition feature good mechanical properties and excellent surface quality.Type: GrantFiled: March 21, 2002Date of Patent: June 29, 2004Assignee: Bayer Polymers LLCInventor: Moh-Ching Oliver Chang
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Patent number: 6756433Abstract: The present invention relates to polycarbonate moulding compositions provided with phosphonate amines and phosphorus compounds, which moulding compositions exhibit excellent flame protection and very good mechanical properties, such as joint line strength or modulus of elasticity, and a good crude shade.Type: GrantFiled: February 27, 2002Date of Patent: June 29, 2004Assignee: Bayer AktiengesellschaftInventors: Michael Zobel, Thomas Eckel, Torsten Derr, Dieter Wittmann
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Patent number: 6753366Abstract: A thermoplastic, flame-retardant moulding composition having improved mechanical properties is disclosed. The composition contains 40 to 99 parts by weight of a thermoplastic polycarbonate or polyester carbonate, 0.5 to 60 parts by weight of a graft polymer, 0 to 45 parts by weight of a thermoplastic vinyl copolymer, 0.5 to 20 parts by weight of a mixture of at least one mono- and at least one oligo-phosphorus conforming to the general formula and 0.05 to 5 parts by weight of a fluorinated polyolefine.Type: GrantFiled: February 7, 2000Date of Patent: June 22, 2004Assignee: Bayer AktiengesellschaftInventors: Thomas Eckel, Dieter Wittmann, Herbert Eichenauer, Heinrich Alberts
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Patent number: 6753364Abstract: A flame retardant molding composition is disclosed. The composition that contains polycarbonate and/or polyester carbonate and a phosphonate amines is characterized by its good level of mechanical properties, especially a high heat resistance, and exhibits low-juicing. An embodiment wherein the composition further contains a graft polymer is also disclosed.Type: GrantFiled: February 27, 2002Date of Patent: June 22, 2004Assignee: Bayer AktiengesellschaftInventors: Michael Zobel, Thomas Eckel, Torsten Derr, Dieter Wittmann
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Patent number: 6753405Abstract: A process for the preparation of transparent copolycarbonate is disclosed. The copolycarbonate the molecular structure of which contains more than 35 mole % of units derived from dihydroxydiphenylene is prepared by the melt transesterification process wherein the final temperature of the reaction is reached in less than 40 minutes after reaching the starting temperature.Type: GrantFiled: July 12, 2002Date of Patent: June 22, 2004Assignee: Bayer AktiengesellschaftInventors: Silke Kratschmer, Lothar Bunzel, Hans Deml