Patents by Inventor Katja Siepen

Katja Siepen 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: 8399105
    Abstract: The present invention relates to a polymer latex made by free-radical emulsion polymerization comprising polymer particles containing structural units derived from at least one conjugated diene component, whereby said polymer particles comprise at least one hard phase segment and at least one soft phase segment, wherein the polymer latex is particularly suitable for the production of dip-molded articles. Furthermore, the present invention relates to a process for making such a polymer latex, to the use of said polymer latex for the production of dip-molded articles, to a compounded polymer latex composition that is suitable for the production of dip-molded articles, to a method for making dip-molded latex articles, as well as to the latex articles obtained thereby.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: March 19, 2013
    Assignee: Polymer Latex GmbH & Co., KG
    Inventors: Soren Butz, Volker Erb, Katja Siepen, Hans-Gunter Vogt
  • Patent number: 8222362
    Abstract: The present invention refers to a polymer latex made by free-radical polymerization comprising polymer particles containing structural units derived from at least one conjugated diene monomer and at least one aromatic vinyl monomer, whereby no vinyl pyridine is used in the polymerization and the polymer latex is polymerized in the presence of at least one chain transfer agent having the general formula RSH, wherein R is a linear alkyl group having 3 to 20 carbon atoms and the dried latex polymer has a Mooney viscosity measured according to DIN 53 523 of 85 to 155, as well as to articles made there from.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: July 17, 2012
    Assignee: Polymerlatex GmbH
    Inventors: Christoph Scholten, Katja Siepen
  • Publication number: 20120028525
    Abstract: The present invention relates to a polymer latex made by free-radical emulsion polymerization comprising polymer particles containing structural units derived from at least one conjugated diene component, whereby said polymer particles comprise at least one hard phase segment and at least one soft phase segment, wherein the polymer latex is particularly suitable for the production of dip-molded articles. Furthermore, the present invention relates to a process for making such a polymer latex, to the use of said polymer latex for the production of dip-molded articles, to a compounded polymer latex composition that is suitable for the production of dip-molded articles, to a method for making dip-molded latex articles, as well as to the latex articles obtained thereby.
    Type: Application
    Filed: September 30, 2011
    Publication date: February 2, 2012
    Applicant: POLYMER LATEX GmbH & CO. KG
    Inventors: SOREN BUTZ, Volker Erb, Katja Siepen, Hans-Gunter Vogt
  • Publication number: 20080039541
    Abstract: The present invention refers to a polymer latex made by free-radical polymerization comprising polymer particles containing structural units derived from at least one conjugated diene monomer and at least one aromatic vinyl monomer, whereby no vinyl pyridine is used in the polymerization and the polymer latex is polymerized in the presence of at least one chain transfer agent having the general formula RSH, wherein R is a linear alkyl group having 3 to 20 carbon atoms and the dried latex polymer has a Mooney viscosity measured according to DIN 53 523 of 85 to 155, as well as to articles made there from.
    Type: Application
    Filed: August 10, 2007
    Publication date: February 14, 2008
    Applicant: POLYMERLATEX GMBH
    Inventors: Christoph Scholten, Katja Siepen
  • Publication number: 20060052513
    Abstract: The present invention relates to a polymer latex made by free-radical emulsion polymerization comprising polymer particles containing structural units derived from at least one conjugated diene component, whereby said polymer particles comprise at least one hard phase segment having a glass transition temperature (Tg) of at least 50° C. and at least one soft phase segment having a glass transition temperature (Tg) of 10° C. at most, the total amount of hard phase segments being 2 to 40 wt-% and the total amount of the soft phase segments being 60 to 98 wt-% based on the total weight of the polymer particles, whereby the Tg is measured by DSC according to ASTM D3418-03 and said polymer latex having an electrolyte stability determined as critical coagulation concentration of less than 30 mmol/l CaCl2 (determined for a total solids content of the latex of 0.1% at pH 10) that is particularly suitable for the production of dip-molded articles.
    Type: Application
    Filed: September 8, 2005
    Publication date: March 9, 2006
    Inventors: Soren Butz, Volker Erb, Katja Siepen, Hans-Gunter Vogt
  • Patent number: 6846435
    Abstract: The present invention relates to a process for preparing metal oxides or metal aquoxides, especially alumina hydrates which can be dispersed in organic solvents, and to sulfonic acid-modified metal oxides or metal aquoxides that can be prepared by this process.
    Type: Grant
    Filed: July 6, 2000
    Date of Patent: January 25, 2005
    Assignee: Sasol Germany GmbH
    Inventors: Frank Michael Bohnen, Katja Siepen, Paul K. Hurlburt, Karen Reitz
  • Patent number: 6452029
    Abstract: A nickel catalytic system that makes it possible to obtain branched compounds from fatty substances by reacting simple olefins on polyunsaturated esters, which may or may not be conjugated, is described. The compounds that are obtained may be hydrogenated and used as lubricant bases or may be transformed according to known procedures into compounds of acid, alcohol, amine or amide type, used in varied applications.
    Type: Grant
    Filed: July 28, 1999
    Date of Patent: September 17, 2002
    Assignee: Institut Francais du Petrole
    Inventors: Gérard Hillion, Hélène Olivier, Katja Siepen, Dominique Commereuc, Robert Stern
  • Patent number: 6153772
    Abstract: A cobalt catalytic system that makes it possible to obtain branched compounds from fatty substances by reacting simple olefins on polyunsaturated esters, which may or may not be conjugated, is described.The compounds that are obtained may be hydrogenated and used as lubricant bases.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: November 28, 2000
    Assignee: Institut Francais du Petrole
    Inventors: Gerard Hillion, Helene Olivier, Katja Siepen, Robert Stern