Patents by Inventor Vera Buchholz
Vera Buchholz 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).
-
Patent number: 7868070Abstract: A thermoplastic molding composition that features improved thermal stability and a relatively low maximum rate of decomposition in the event of fire is disclosed. The composition contains an aromatic polycarbonate and/or polyester carbonate, and a modified layered compound, the modification with organic polymer by means of a solvent-free melt process. Optional additional components include an impact modifier, a thermoplastic (co)copolymer, and a phosphorus compound.Type: GrantFiled: December 11, 2006Date of Patent: January 11, 2011Assignee: Bayer MaterialScience AGInventors: Eckhard Wenz, Uwe Peucker, Thomas Eckel, Dieter Wittmann, Arno Nennemann, Vera Buchholz
-
Patent number: 7834069Abstract: A thermoplastic molding composition that features good mechanical properties as well as processability is disclosed. The composition that contains aromatic polycarbonate and/or aromatic polyester carbonate, rubber-modified graft polymer and a plurality of hollow ceramic beads is suitable for making molded articles characterized by good ESC behavior and flammability rating.Type: GrantFiled: November 16, 2007Date of Patent: November 16, 2010Assignee: Bayer MaterialScience AGInventors: Thomas Eckel, Achim Feldermann, Burkhard Thuermer, Vera Buchholz
-
Patent number: 7834075Abstract: A poly(ester)carbonate compositions characterized by its flame resistance and high impact strength is disclosed. The composition that contains branched aromatic poly(ester)carbonate, a graft polymer wherein the graft base is silicone rubber or silicone-acrylate rubber, talc, phosphorus-containing flameproofing agent, and an inorganic boron compound, and an optional anti-dripping agent satisfies enhanced fire-protection requirements.Type: GrantFiled: March 19, 2007Date of Patent: November 16, 2010Assignee: Bayer MaterialScience AGInventors: Vera Buchholz, Eckhard Wenz, Thomas Eckel, Burkhard Thuermer, Dieter Wittmann
-
Patent number: 7833448Abstract: A process for producing a three-dimensional article comprising a poly(ester)carbonate compositions characterized by its flame resistance and high impact strength is disclosed. The composition that contains branched aromatic poly(ester)carbonate, a graft polymer wherein the graft base is silicone rubber or silicone-acrylate rubber, talc, phosphorus-containing flameproofing agent, and an inorganic boron compound, and an optional anti-dripping agent satisfies enhanced fire-protection requirements.Type: GrantFiled: March 19, 2007Date of Patent: November 16, 2010Assignee: Bayer MaterialScience AGInventors: Vera Buchholz, Eckhard Wenz, Thomas Eckel, Burkhard Thuermer, Dieter Wittmann
-
Publication number: 20090215945Abstract: The present invention relates to an impact-modified polyalkylene terephthalate/polycarbonate composition comprising A) 41 to 97 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of aromatic polycarbonate, B) 2 to 19 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of polyalkylene terephthalate, C) 0.5 to 15 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of rubber-modified graft polymer, D) 0.5 to 25 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of a salt of a phosphinic acid, A composition of the present invention is distinguished by an optimum combination of high heat distortion temperature, good flameproofing and excellent mechanical properties (in particular high E modulus), the use of the polycarbonate compositions for the production of shaped articles and the shaped articles themselves.Type: ApplicationFiled: December 18, 2008Publication date: August 27, 2009Applicant: BAYER MATERIALSCIENCE AGInventors: Pierre MOULINIE, Vera BUCHHOLZ, Eckhard WENZ, Dieter WITTMANN
-
Publication number: 20090198010Abstract: The present invention relates to a polycarbonate composition comprising A) 38 to 99.3 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of aromatic polycarbonate and/or aromatic polyester carbonate, B) 0.5 to 12 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of rubber-modified graft polymer, C) 0.1 to 25 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of a salt of a phosphinic acid, and D) 0.1 to 25 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of talc, A composition of the present invention is distinguished by an optimum combination of high heat distortion temperature, good flameproofing, excellent mechanical properties and a good resistance to chemicals and hydrolysis. The invention also relates to the use of polycarbonate compositions for the production of shaped articles and the shaped articles themselves.Type: ApplicationFiled: December 18, 2008Publication date: August 6, 2009Inventors: Thomas ECKEL, Vera BUCHHOLZ, Eckhard WENZ
-
Publication number: 20090163629Abstract: The present invention relates to impact-modified polycarbonate compositions comprising A) 50 to 99.4 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of aromatic polycarbonate and/or aromatic polyester carbonate, B) 0.5 to 20 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of graft polymer containing a silicone rubber or silicone/acrylate rubber, C) 0.1 to 30 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of a salt of a phosphinic acid. which are distinguished by an optimum combination of good flameproofing, high heat distortion temperature, good mechanical properties and good resistance to chemicals, the use of the polycarbonate compositions for the production of shaped articles and the shaped articles themselves.Type: ApplicationFiled: December 18, 2008Publication date: June 25, 2009Applicant: BAYER MATERIALSCIENCE AGInventors: Thomas ECKEL, Vera BUCHHOLZ, Dieter WITTMANN, Eckhard WENZ
-
Publication number: 20090160103Abstract: The present invention relates to a polycarbonate composition comprising A) 58 to 99.6 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of aromatic polycarbonate and/or aromatic polyester carbonate, B) 0.5 to 12 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of rubber-modified graft polymer prepared in the bulk, solution or bulk-suspension polymerization process, and C) 0.1 to 30 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C) of a salt of a phosphinic acid. A composition of the present invention is distinguished by an optimum combination of high heat distortion temperature, good flameproofing, excellent mechanical properties and a good resistance to hydrolysis. The present invention further relates to the use of the polycarbonate compositions for the production of shaped articles and the shaped articles themselves.Type: ApplicationFiled: December 18, 2008Publication date: June 25, 2009Applicant: Bayer MaterialScience AGInventors: Thomas ECKEL, Vera BUCHHOLZ, Eckhard WENZ
-
Patent number: 7446144Abstract: A thermoplastic molding composition suitable for preparing articles by thermoforming is disclosed. The molding composition that comprise A) branched, aromatic poly(ester)carbonate, B) graft polymer, C) an optional vinyl(co)polymer and or polyalkylene terephthalate, D) at least one flame retarding phosphorous compound selected from the group consisting of mono- and oligomeric phosphorus and phosphonic acid esters, phosphonate amines and phosphazenes and E) talc, is characterized in that its flexural modulus at room temperature is at least 3000 N/mm2 and that its falling dart energy at break, at ?30° C., is at least 40.0 J. Sheets extruded of the composition are suitable for making useful articles by thermoforming.Type: GrantFiled: September 14, 2005Date of Patent: November 4, 2008Assignees: Bayer MaterialScience LLC, Bayer MaterialScience AGInventors: Eckhard Wenz, Pierre Moulinié, Thomas Eckel, Vera Buchholz, Dieter Wittmann, Bruce Hager, Fred J. Zaganiacz
-
Publication number: 20080132617Abstract: A thermoplastic molding composition comprising aromatic polycarbonate and/or aromatic polyester carbonate, a rubber-modified graft polymer and a plurality of hollow glass beads is disclosed. The composition is distinguished by its improved flowability, high stiffness and small processing shrinkage, as well as unchanged high scratch resistance. The composition is suitable for producing molded articles having desirable properties.Type: ApplicationFiled: November 16, 2007Publication date: June 5, 2008Inventors: Thomas Eckel, Achim Feldermann, Andreas Seidel, Vera Buchholz, Bernd Keller
-
Publication number: 20080132618Abstract: A thermoplastic molding composition that features good mechanical properties as well as processability is disclosed. The composition that contains aromatic polycarbonate and/or aromatic polyester carbonate, rubber-modified graft polymer and a plurality of hollow ceramic beads is suitable for making molded articles characterized by good ESC behavior and flammability rating.Type: ApplicationFiled: November 16, 2007Publication date: June 5, 2008Inventors: Thomas Eckel, Achim Feldermann, Burkhard Thuermer, Vera Buchholz
-
Publication number: 20070225413Abstract: A process for producing a three-dimensional article comprising a poly(ester)carbonate compositions characterized by its flame resistance and high impact strength is disclosed. The composition that contains branched aromatic poly(ester)carbonate, a graft polymer wherein the graft base is silicone rubber or silicone-acrylate rubber, talc, phosphorus-containing flameproofing agent, and an inorganic boron compound, and an optional anti-dripping agent satisfies enhanced fire-protection requirements.Type: ApplicationFiled: March 19, 2007Publication date: September 27, 2007Inventors: Vera Buchholz, Eckhard Wenz, Thomas Eckel, Burkhard Thuermer, Dieter Wittmann
-
Publication number: 20070225441Abstract: A flame resistant, impact-modified polycarbonate composition is disclosed. The composition that is suitable especially for preparing thermoformed articles comprises branched aromatic polycarbonate and/or branched aromatic polyester carbonate, a graft polymer containing silicone rubber or silicone acrylate rubber, talc, and a phosphorus-containing flameproofing agent, and meets high requirements in terms of fireproofing. Also disclosed is a process for the preparation of the composition and its use in the production of molded articles.Type: ApplicationFiled: March 19, 2007Publication date: September 27, 2007Inventors: Eckhard Wenz, Thomas Eckel, Vera Buchholz, Dieter Wittmann, Burkhard Thuermer
-
Publication number: 20070225412Abstract: A poly(ester)carbonate compositions characterized by its flame resistance and high impact strength is disclosed. The composition that contains branched aromatic poly(ester)carbonate, a graft polymer wherein the graft base is silicone rubber or silicone-acrylate rubber, talc, phosphorus-containing flameproofing agent, and an inorganic boron compound, and an optional anti-dripping agent satisfies enhanced fire-protection requirements.Type: ApplicationFiled: March 19, 2007Publication date: September 27, 2007Inventors: Vera Buchholz, Eckhard Wenz, Thomas Eckel, Burkhard Thuermer, Dieter Wittmann
-
Publication number: 20070142535Abstract: A thermoplastic molding composition that features improved thermal stability and a relatively low maximum rate of decomposition in the event of fire is disclosed. The composition contains an aromatic polycarbonate and/or polyester carbonate, and a modified layered compound, the modification with organic polymer by means of a solvent-free melt process. Optional additional components include an impact modifier, a thermoplastic (co)copolymer, and a phosphorus compound.Type: ApplicationFiled: December 11, 2006Publication date: June 21, 2007Inventors: Eckhard Wenz, Uwe Peucker, Thomas Eckel, Dieter Wittmann, Arno Nennemann, Vera Buchholz
-
Publication number: 20070060678Abstract: A thermoplastic molding composition suitable for preparing articles by thermoforming is disclosed. The molding composition that comprise A) branched, aromatic poly(ester)carbonate, B) graft polymer, C) an optional vinyl(co)polymer and or polyalkylene terephthalate, D) at least one flame retarding phosphorous compound selected from the group consisting of mono- and oligomeric phosphorus and phosphonic acid esters, phosphonate amines and phosphazenes and E) talc, is characterized in that its flexural modulus at room temperature is at least 3000 N/mm2 and that its falling dart energy at break, at ?30° C., is at least 40.0 J. Sheets extruded of the composition are suitable for making useful articles by thermoforming.Type: ApplicationFiled: September 14, 2005Publication date: March 15, 2007Inventors: Eckhard Wenz, Pierre Moulinie, Thomas Eckel, Vera Buchholz, Dieter Wittmann, Bruce Hager, Fred Zaganiacz
-
Patent number: 7122379Abstract: A method of using Raman Spectra for determining the progress of a graft polymerization reaction is disclosed. The method entails (a) measuring at the beginning of the reaction and at a plurality of time intervals in the course of the reaction, continuously and on-site, the Raman spectrum in the wave number range of 100 to 4000 cm?1 of one or more of the monomers and/or polymers entailed in the reaction and of at least one internal standard and (b) recording the spectra and (c) adding reaction partners necessary to the reaction continuously and/or discontinuously and (d) calculating the change in concentration of the monomers and polymers by comparing the spectra of the monomers or polymers with the internal standard.Type: GrantFiled: October 28, 2002Date of Patent: October 17, 2006Assignee: Bayer AktiengesellschaftInventors: Udo Wolf, Ralf-Jürgen Born, Vera Buchholz, Herbert Eichenauer, Eckhard Wenz, Wilhelm Bergmeier, Christof Boden
-
Publication number: 20040176532Abstract: A process of producing a graft polymer of the ABS type by the emulsion method is disclosed. In the process wherein 5 to 95% by weight of a monomer mixture that contains A) 50 to 99 parts by weight of at least one vinyl aromatic compound and B) 1 to 50 parts by weight of at least one copolymer is polymerized in the presence of C) 95 to 5% by weight of one or more graft substrates having a glass transition temperature <10° C., the improvement includes monitoring continuously in the course of the reaction the Raman spectra of the reaction mixture, determining deviations from the specified desired course of the reaction and making corresponding adjustments.Type: ApplicationFiled: February 4, 2004Publication date: September 9, 2004Inventors: Vera Buchholz, Eckhard Wenz, Herbert Eichenauer, Ralf-Jurgen Born, Christian Lange, Sven Hobeika
-
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
-
Publication number: 20030130433Abstract: A process of preparing a graft polymer (e.g., an ABS graft copolymer), which involves determining the concentration of at least one reaction component during the course of the reaction by means of Raman spectroscopy, is disclosed. The process, more particularly, comprises: (a) synthesizing the graft polymer from a reaction mixture comprising reactive components (e.g., monomers such as styrene and acrylonitrile, and a graft base); (b) analyzing the reaction mixture, at intervals, during the synthesis of the graft polymer, by means of Raman spectra; (c) recording the results of the Raman spectra analysis; (d) determining the concentration of at least one of said reactive components (e.g., styrene) by means of spectral evaluation of the recorded Raman spectra; and (e) terminating the synthesis reaction of the graft polymer when the concentration of at least one of the reactive components has reached a predetermined concentration value.Type: ApplicationFiled: October 28, 2002Publication date: July 10, 2003Inventors: Eckhard Wenz, Vera Buchholz, Herbert Eichenauer, Udo Wolf, Ralf-Jurgen Born, Ulrich Jansen, Wolfgang Dietz