Patents by Inventor Steffen Kuhling
Steffen Kuhling has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7129315Abstract: A process for the isolation of polycarbonate produced by the interfacial polymerization process is disclosed. Accordingly, the process entails (a) evaporating the organic solvent from the solution that contains solvent and polycarbonate to obtain a material system that contains 90 to 99.95% polycarbonate, the percent being relative to the weight of the system, and (b) passing the material system through inlet openings of a separating vessel to obtain a plurality of streams of polycarbonate, on entry into the inlet openings said material system being supersaturated with volatile constituents to an extent of at least 1 bar and having a temperature of 250° to 340° C. and a flow rate of 0.1 to 20 kg/hour, and (c) degassing the streams in the separating vessel wherein the pressure is 0.1 to 20 mbar to effect degassing of the polycarbonate.Type: GrantFiled: April 14, 2005Date of Patent: October 31, 2006Assignee: Bayer MaterialScience AGInventors: Jörg Kirchhoff, Thomas König, Klemens Kohlgrüber, Steffen Kühling, Dirk Van Meirvenne
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Patent number: 7091302Abstract: The invention describes a process for the preparation of polycarbonate. The process includes (a) transesterifying at least one aromatic dihydroxyaryl compound and a diaryl carbonate in the melt in the presence of a catalyst, (b) mixing the melt obtained in step (a) with a foaming agent (c) passing the mixture at 250 to 340° C. through inlet openings of a separating vessel at a rate of 0.1 to 20 kg/hour, to obtain a plurality of streams of foamed polycarbonate and degassing the streams of foamed polycarbonate in the separating vessel wherein the pressure is 0.1 to 20 mbar.Type: GrantFiled: April 14, 2005Date of Patent: August 15, 2006Assignee: Bayer Materialscience AGInventors: Jörg Kirchhoff, Thomas König, Klemens Kohlgrüber, Steffen Kühling, Melanie Möthrath, Dirk Van Meirvenne
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Publication number: 20050239996Abstract: A process for the isolation of polycarbonate produced by the interfacial polymerization process is disclosed. Accordingly, the process entails (a) evaporating the organic solvent from the solution that contains solvent and polycarbonate to obtain a material system that contains 90 to 99.95% polycarbonate, the percent being relative to the weight of the system, and (b) passing the material system through inlet openings of a separating vessel to obtain a plurality of streams of polycarbonate, on entry into the inlet openings said material system being supersaturated with volatile constituents to an extent of at least 1 bar and having a temperature of 250° to 340° C. and a flow rate of 0.1 to 20 kg/hour, and (c) degassing the streams in the separating vessel wherein the pressure is 0.1 to 20 mbar to effect degassing of the polycarbonate.Type: ApplicationFiled: April 14, 2005Publication date: October 27, 2005Inventors: Jorg Kirchhoff, Thomas Konig, Klemens Kohlgruber, Steffen Kuhling, Dirk Van Meirvenne
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Publication number: 20050239995Abstract: The invention describes a process for the preparation of polycarbonate. The process includes (a) transesterifying at least one aromatic dihydroxyaryl compound and a diaryl carbonate in the melt in the presence of a catalyst, (b) mixing the melt obtained in step (a) with a foaming agent (c) passing the mixture at 250 to 340° C. through inlet openings of a separating vessel at a rate of 0.1 to 20 kg/hour, to obtain a plurality of streams of foamed polycarbonate and degassing the streams of foamed polycarbonate in the separating vessel wherein the pressure is 0.1 to 20 mbar.Type: ApplicationFiled: April 14, 2005Publication date: October 27, 2005Inventors: Jorg Kirchhoff, Thomas Konig, Klemens Kohlgruber, Steffen Kuhling, Melanie Mothrath, Dirk Meirvenne
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Publication number: 20050043500Abstract: Polycarbonate substrates having low concentration of defects are disclosed. The substrates are suitable for producing molded articles characterized by low cloudiness.Type: ApplicationFiled: September 30, 2004Publication date: February 24, 2005Inventors: Michael Bodiger, Steffen Kuhling, Franky Bruynseels, Dirk Meirvenne, Rene Cleyn
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Patent number: 6855390Abstract: A process for the preparation of optical data carriers made of a particualr polycarbonate is disclosed. The polycarbonate is prepared by the phase boundary process that entails reacting at least one dihydroxydiarylalkane in the form of its alkali metal salts with phosgene in the heterogeneous phase in the presence of sodium hydroxide solution and an organic solvent. The process is characterized in that the feedstock have but low content of Fe, Cr, Ni, Zn, Ca, Mg, Al metals or homologues thereof, and in that the organic solvent is separated off, and in that the polycarbonate which is obtained is worked up. The resulting polycarbonate is particularly useful in producing optical data carriers.Type: GrantFiled: October 23, 2000Date of Patent: February 15, 2005Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen, N.V.Inventors: Wilfried Haese, Friedrich-Karl Bruder, Thomas Bieringer, Steffen Kühling, Franky Bruynseels, Dirk van Meirvenne, René de Cleyn
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Patent number: 6855794Abstract: Polycarbonate substrates, the preparation of which is based on 1,1-bis-(4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 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: GrantFiled: February 23, 2004Date of Patent: February 15, 2005Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen N.V.Inventors: Michael Bödiger, Steffen Kühling, Franky Bruynseels, Dirk van Meirvenne, René de Cleyn
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Patent number: 6835798Abstract: A process for the preparation of polycarbonate by the phase boundary process is disclosed. The process entails reacting at least one dihydroxydiarylalkane in the form of its alkali metal salts with phosgene in the heterogeneous phase in the presence of sodium hydroxide solution and an organic solvent. The process is characterized in that the feedstock have but low content of Fe, Cr, Ni, Zn, Ca, Mg, Al metals or homologues thereof, and in that the organic solvent is separated off, and in that the polycarbonate which is obtained is worked up. The resulting polycarbonate is particularly useful in producing transparent shaped articles.Type: GrantFiled: August 5, 2002Date of Patent: December 28, 2004Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen N.V.Inventors: Michael Bödiger, Steffen Kühling, Franky Bruynseels, Dirk van Meirvenne, René de Cleyn
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Patent number: 6815524Abstract: Polycarbonate substrates having low concentration of defects are disclosed. The substrates are suitable for producing molded articles characterized by low cloudiness.Type: GrantFiled: August 5, 2002Date of Patent: November 9, 2004Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen N.V.Inventors: Michael Bödiger, Steffen Kühling, Franky Bruynseels, Dirk van Meirvenne, Renë de Cleyn
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Publication number: 20040166283Abstract: 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: ApplicationFiled: February 23, 2004Publication date: August 26, 2004Inventors: Michael Bodiger, Steffen Kuhling, Franky Bruynseels, Dirk van Meirvenne, Rene de Cleyn
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Patent number: 6720406Abstract: 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: GrantFiled: April 30, 2002Date of Patent: April 13, 2004Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen N.V.Inventors: Thomas Elsner, Jürgen Heuser, Christian Kords, Steffen Kühling, Paul Viroux
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Patent number: 6710154Abstract: 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: GrantFiled: July 10, 2002Date of Patent: March 23, 2004Assignee: Bayer AktiengesellschaftInventors: Tony van Osselaer, Steffen Kühling, Paul Viroux, Hugo Plompen, Richard Vansant
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Patent number: 6703473Abstract: An improvement to the melt transesterification reaction of diaryl carbonate with dihydroxy aryl compound is disclosed.Type: GrantFiled: January 2, 2002Date of Patent: March 9, 2004Assignee: Bayer AktiengesellschaftInventors: Uwe Hucks, Kaspar Hallenberger, Silke Kratschmer, Michael Prein, Steffen Kühling
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Patent number: 6696542Abstract: 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: GrantFiled: August 5, 2002Date of Patent: February 24, 2004Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen, N.V.Inventors: Michael Bödiger, Steffen Kühling, Franky Bruynseels, Dirk van Meirvenne, René de Cleyn
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Patent number: 6689464Abstract: 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: GrantFiled: August 31, 2001Date of Patent: February 10, 2004Assignee: Bayer AktiengesellschaftInventors: Rolf Lanze, Alfred Eitel, Rainer Neumann, Steffen Kühling, Frieder Heydenreich, Tony van Osselaer, Rainer Bellinghausen, Heiko Herold
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Patent number: 6682794Abstract: 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: GrantFiled: March 5, 2002Date of Patent: January 27, 2004Assignee: Bayer AktiengesellschaftInventors: Klaus Horn, Steffen Kühling, Ralf Hufen, Rolf Lanze, Michael Prein, Rainer Neumann, Hermann Kauth, Frieder Heydenreich, Tony van Osselaer
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Patent number: 6680400Abstract: 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: GrantFiled: December 12, 2001Date of Patent: January 20, 2004Assignee: Bayer AktiengesellschaftInventors: Wolfgang Alewelt, Steffen Kühling, Johan Vanden Eynde, Dirk Van Meirvenne
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Patent number: 6646101Abstract: 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: GrantFiled: November 8, 2002Date of Patent: November 11, 2003Assignee: Bayer AktiengesellschaftInventors: Silke Kratschmer, Klaus Horn, Annett König, Rolf Wehrmann, Steffen Kühling
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Patent number: 6586556Abstract: 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: GrantFiled: September 24, 2001Date of Patent: July 1, 2003Assignee: Bayer AktiengesellschaftInventors: Silke Kratschmer, Klaus Horn, Annett König, Rolf Wehrmann, Steffen Kühling
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Publication number: 20030092873Abstract: 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: ApplicationFiled: November 8, 2002Publication date: May 15, 2003Inventors: Silke Kratschmer, Klaus Horn, Annett Konig, Rolf Wehrmann, Steffen Kuhling