Patents by Inventor Kirsten Markgraf

Kirsten Markgraf 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).

  • Publication number: 20230383105
    Abstract: A polymer composition for producing gel extruded articles is described. The polymer composition contains polyethylene particles combined with a plasticizer and one or more surface tension reducing techniques. In one aspect, the surface tension reducing technique includes adding a filler or chemical component to the polyethylene polymer for increasing wettability. Alternatively, the surface tension reducing technique can be a surface treatment, such as a plasma treatment. Polymer articles made in accordance with the present disclosure can have dramatically increased wettability properties. In one embodiment, the polymer composition is used to form a porous membrane for use as a separator in electronic devices.
    Type: Application
    Filed: October 28, 2020
    Publication date: November 30, 2023
    Inventors: Christian Ohm, Kirsten Markgraf, Argiri Tsami-Schullte, Fangfang Tao
  • Patent number: 11827760
    Abstract: A fiber reinforced polyester polymer composition is disclosed that contains at least one tribological modifier. The tribological modifier may comprise an ultra-high molecular weight silicone alone or in combination with polyytetrafluoroethylene particles. The composition not only has excellent tensile properties but also can produce a low friction surface.
    Type: Grant
    Filed: January 14, 2022
    Date of Patent: November 28, 2023
    Assignee: Celanese Sales Germany GmbH
    Inventors: Qamer Zia, Kirsten Markgraf, Dirk Zierer
  • Publication number: 20230323107
    Abstract: A colorized and tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer in combination with at least one tribological modifier. The tribological modifier may include a fluoropolymer. The polymer composition further contains at least one coloring agent in combination with a color stabilizer. The color stabilizer has been found to dramatically improve color consistency. Polymer articles molded from the polymer composition not only have excellent surface appearance but have excellent low friction characteristics when tested against aluminum.
    Type: Application
    Filed: May 25, 2023
    Publication date: October 12, 2023
    Inventors: Qamer Zia, Thomas Seelmann, Kirsten Markgraf
  • Patent number: 11661512
    Abstract: A colorized and tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer in combination with at least one tribological modifier. The tribological modifier may include a fluoropolymer. The polymer composition further contains at least one coloring agent in combination with a color stabilizer. The color stabilizer has been found to dramatically improve color consistency. Polymer articles molded from the polymer composition not only have excellent surface appearance but have excellent low friction characteristics when tested against aluminum.
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: May 30, 2023
    Assignee: CELANESE INTERNATIONAL CORPORATION
    Inventors: Qamer Zia, Thomas Seelmann, Kirsten Markgraf
  • Publication number: 20230077194
    Abstract: A polyester polymer composition is disclosed containing reinforcing fibers and having improved adhesion to elastomeric materials while also being formulated for medical applications and/or food service applications. The polyester polymer composition can contain a blend of different polyester polymers and can be free of hindered phenolic antioxidants. The polyester polymer composition can be used in overmolding applications in which the composition is initially molded into a polymer component and then overmolded with an elastomeric material. The elastomeric material can contain a copolyester elastomer and can serve as a sealing member.
    Type: Application
    Filed: August 29, 2022
    Publication date: March 9, 2023
    Inventors: Qamer Zia, Kirsten Markgraf, Dirk Zierer, Patrick Nickolay
  • Publication number: 20230055930
    Abstract: A tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer, reinforcing fibers, and at least one tribological modifier. The tribological modifier, in one embodiment, can comprise a graft copolymer. The use of a graft copolymer has been found to unexpectedly and dramatically improve noise generation when tested against various substrates, especially glass substrates.
    Type: Application
    Filed: October 6, 2022
    Publication date: February 23, 2023
    Inventors: Kirsten Markgraf, Joachim Floeck
  • Publication number: 20220403159
    Abstract: Halogen-free, flame resistant and hydrolysis resistant polymer compositions are disclosed. The polymer composition of the present disclosure is also formulated to have improved electrical tracking resistance. The polymer composition contains a thermoplastic polymer, such as polybutylene terephthalate. The thermoplastic polymer is combined with a flame retardant that can include a phosphinate optionally in combination with a phosphite and/or a nitrogen-containing synergist. In order to improve electrical tracking resistance, one or more electrical resistance agents are added to the polymer composition. The electrical resistance agent, for instance, can be a flexible polymer.
    Type: Application
    Filed: June 7, 2022
    Publication date: December 22, 2022
    Inventors: Qamer Zia, Kirsten Markgraf, Dirk Zierer, Patrick Nickolay
  • Publication number: 20220332941
    Abstract: A fiber reinforced thermoplastic polymer composition is disclosed that contains at least one mold release agent. The mold release agent can comprise a polar material and/or a non-polar material. In one embodiment, both a polar wax and a non-polar wax are used. The polymer composition may also contain one or more tribological modifiers. The tribological modifier may comprise an ultra-high molecular weight silicone.
    Type: Application
    Filed: April 20, 2022
    Publication date: October 20, 2022
    Inventors: Qamer Zia, Kirsten Markgraf, Dirk Zierer, Patrick Nickolay
  • Patent number: 11407957
    Abstract: A tribologically modified polyoxymethylene polymer composition is disclosed. The polyoxymethylene polymer composition is comprised of a polyoxymethylene polymer in combination with a tribological modifier system. The tribological modifier system may include the combination of a fluoropolymer with a high density polyethylene, such as an oxidized high density polyethylene. The particular formulation provides a synergistic blend of properties. For instance, the polymer composition not only has an excellent surface appearance when molded into articles but has excellent low friction characteristics when tested against aluminum.
    Type: Grant
    Filed: January 17, 2020
    Date of Patent: August 9, 2022
    Assignee: Celanese Sales Germany GmbH
    Inventors: Qamer Zia, Kirsten Markgraf
  • Publication number: 20220135751
    Abstract: A fiber reinforced polyester polymer composition is disclosed that contains at least one tribological modifier. The tribological modifier may comprise an ultra-high molecular weight silicone alone or in combination with polyytetrafluoroethylene particles. The composition not only has excellent tensile properties but also can produce a low friction surface.
    Type: Application
    Filed: January 14, 2022
    Publication date: May 5, 2022
    Inventors: Qamer Zia, Kirsten Markgraf, Dirk Zierer
  • Publication number: 20220049043
    Abstract: The present disclosure is directed to a process for producing a polyoxymethylene polymer or paraformaldehyde in an environmentally friendly and sustainable manner. The polyoxymethylene polymer or paraformaldehyde can be produced so as to be carbon neutral or even carbon negative. In one aspect, the polyoxymethylene polymer or paraformaldehyde is formed from a biogas or from a recycled gas. The biogas and the recycled gas are used to produce the components needed to form the polymer.
    Type: Application
    Filed: August 13, 2021
    Publication date: February 17, 2022
    Inventors: Klaus Kurz, Kirsten Markgraf, Michael Hoffmockel, Kai-Uwe Tönnes
  • Publication number: 20220033646
    Abstract: Halogen-free, flame resistant and hydrolysis resistant polymer compositions are disclosed. The polymer composition contains a thermoplastic polymer, such as polybutylene terephthalate. The thermoplastic polymer is combined with a flame retardant that can include a phosphinate, a phosphite, and a nitrogen-containing synergist. In addition, the composition can contain various hydrolysis resistant components. For instance, the polyester polymer incorporated into the composition can have a relatively low amount of carboxyl end groups. In addition, the composition can contain reinforcing fibers that are coated with a hydrolysis resistant agent. The composition can also contain an organometallic compatibilizer.
    Type: Application
    Filed: July 30, 2021
    Publication date: February 3, 2022
    Inventors: Qamer Zia, Dirk Zierer, Kirsten Markgraf, Patrick Nickolay
  • Patent number: 11225559
    Abstract: A fiber reinforced polyester polymer composition is disclosed that contains at least one tribological modifier. The tribological modifier may comprise an ultra-high molecular weight silicone alone or in combination with polytetrafluoroethylene particles. The composition not only has excellent tensile properties but also can produce a low friction surface.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: January 18, 2022
    Assignee: Ticona GmbH
    Inventors: Qamer Zia, Kirsten Markgraf, Dirk Zierer
  • Publication number: 20210351476
    Abstract: A polymer composition for producing gel extruded articles is described. The polymer composition contains polyethylene particles combined with a plasticizer and one or more shutdown reducing additives. The shutdown reducing additives decrease the shutdown temperature of polymer articles made from the polymer composition. In one embodiment, the polymer composition is used to form a porous membrane for use of a battery separator.
    Type: Application
    Filed: April 30, 2021
    Publication date: November 11, 2021
    Inventors: Christian Ohm, Kirsten Markgraf
  • Publication number: 20210340292
    Abstract: A polymer composition for producing gel extruded articles is described. The polymer composition contains polyethylene copolymer particles combined with a plasticizer. The polyethylene copolymer can be a high density polyethylene copolymer made from ethylene and one or more comonomers. The comonomers are incorporated into the polymer for reducing the shutdown temperature of the polymer composition and of polymer articles made from the polymer composition. In one embodiment, the polymer composition is used to form a porous membrane for use of a battery separator.
    Type: Application
    Filed: April 30, 2021
    Publication date: November 4, 2021
    Inventors: Christian Ohm, Kirsten Markgraf, Arvind Yadav
  • Publication number: 20210206051
    Abstract: A polymer composition containing a polyoxymethylene polymer having low shrinkage characteristics and/or an expanded processing window is disclosed. The polymer composition is particularly well suited for use in three-dimensional printing systems, such as printers that use filament fusion technology. The polymer composition, for instance, can be a feed material in the form of a filament or polymeric pellets. The feed material can be placed in a printer cartridge for insertion into a three-dimensional printing system. In accordance with the present disclosure, a polyoxymethylene polymer is combined with one or more dimensional stabilizing agents for dramatically improving the processing characteristics of the polymer.
    Type: Application
    Filed: December 17, 2020
    Publication date: July 8, 2021
    Inventors: Craig Peterson, Kirsten Markgraf, Xiaowei Zhang
  • Publication number: 20210179846
    Abstract: A polymer composition containing a polyoxymethylene polymer having low shrinkage characteristics and/or an expanded processing window is disclosed. The polymer composition is in the form of a powder containing particles having a controlled particle size and particle size distribution. The powder is formulated so as to be used in a three-dimensional printing system, such as a fused bed process.
    Type: Application
    Filed: December 17, 2020
    Publication date: June 17, 2021
    Inventors: Craig Peterson, Kirsten Markgraf, Xiaowei Zhang
  • Patent number: 11015031
    Abstract: The present disclosure is generally directed to a fiber reinforced polyoxymethylene polymer composition having extremely low formaldehyde emission characteristics. The polymer composition generally contains reinforcing fibers in an amount from 3% to 70% by weight. The reinforcing fibers are combined with a polyoxymethylene polymer having a relatively high melt volume flow rate. The polymer composition can also contain a coupling agent for better integrating the reinforcing fibers into the polymer matrix. In addition to low emission properties, the polymer composition of the present disclosure displays excellent mechanical properties.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: May 25, 2021
    Assignee: Celanese Sales Germany GmbH
    Inventor: Kirsten Markgraf
  • Publication number: 20200407550
    Abstract: Halogen-free, flame resistant polymer compositions are disclosed. The polymer composition contains a thermoplastic polymer, such as polybutylene terephthalate. The thermoplastic polymer is combined with a flame retardant that includes a phosphinate, a phosphite, and a nitrogen-containing synergist. In addition, the composition can contain a fluoropolymer and an organometallic compatibilizer. The flame resistant composition displays excellent flame resistance even when containing the thermoplastic polymer in amounts greater than 60% by weight.
    Type: Application
    Filed: June 26, 2020
    Publication date: December 31, 2020
    Inventors: Qamer Zia, Dirk Zierer, Kirsten Markgraf, Young Shin Kim
  • Patent number: 10731027
    Abstract: The present invention relates to a molding composition, a process for manufacturing the molding composition, and molded parts obtainable from the molding composition. The molding composition can contain at least one polyoxymethylene having terminal OH-groups, at least one polyisocyanate coupling agent, at least one reinforcing fiber, and at least one formaldehyde scavenger. The moldings produced from the molding composition are distinguished by their improved mechanical properties while having low formaldehyde emissions and excellent tensile strength while having a good flex fatigue and creep performance.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: August 4, 2020
    Assignee: Celanese Sales Germany GmbH
    Inventors: Kirsten Markgraf, Lowell Larson