Patents by Inventor Rudolf Pfaendner

Rudolf Pfaendner 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: 12552913
    Abstract: The present invention relates to the use of at least one phenolically substituted sugar derivative as a stabiliser of organic materials, in particular plastics, against oxidative, thermal and/or actinic degradation. The present invention also relates to a corresponding plastic composition, to a method for stabilising plastics, to a moulding compound or a moulded part as well as a phenolically substituted sugar derivative.
    Type: Grant
    Filed: July 7, 2020
    Date of Patent: February 17, 2026
    Assignee: Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V.
    Inventor: Rudolf Pfaendner
  • Patent number: 12545765
    Abstract: This object is achieved by an oligomer or polymer, comprising a phosphorus-comprising structural element described herein, its composition comprising the aforementioned oligomer or polymer and an organic component to be stabilized, and by the possible uses of the oligomers or polymers according to the invention, relating to a molding compound or a molded part, and relating to an intermediate suitable for synthesizing the oligomers or polymers according to the invention. Advantageous developments thereof are also described.
    Type: Grant
    Filed: July 17, 2020
    Date of Patent: February 10, 2026
    Assignee: Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V.
    Inventors: Markus Olschewski, Elke Metzsch-Zilligen, Rudolf Pfaendner
  • Patent number: 12428556
    Abstract: Disclosed is the use of a mixture consisting of at least one aliphatic or cycloaliphatic polyol, in particular one adlitol or cyclitol, and at least one organic phosphorus compound under protic conditions as an additive that catalyzes the hydrolysis of condensation polymers. Also disclosed is a condensation polymer composition which contains at least one aliphatic or cycloaliphatic polyol, at least one organic phosphorus compound and at least one condensation polymer. Further disclosed is a molding compound or a molded part that can be produced from the condensation polymer composition. A method for producing the condensation polymer composition is also disclosed.
    Type: Grant
    Filed: January 17, 2020
    Date of Patent: September 30, 2025
    Assignee: Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V.
    Inventors: Matthias Polidar, Elke Metzsch-Zilligen, Rudolf Pfaendner
  • Patent number: 12421372
    Abstract: The present invention relates to a method of stabilizing virgin thermoplastic material against oxidative, thermal and/or actinic degradation. In the method of the invention, at least one polyphenol and at least one alditol and/or cyclitol are introduced into a virgin thermoplastic material. The method of the invention can stabilize virgin thermoplastic material with high efficacy and in a very environmentally friendly and inexpensive manner against oxidative, thermal and/or actinic degradation. The present invention additionally also relates to correspondingly stabilized virgin thermoplastic material and to moulding compounds and mouldings produced therefrom. The present invention also further relates to stabilizer compositions and to the use thereof for stabilization of virgin thermoplastic material against oxidative, thermal and/or actinic degradation.
    Type: Grant
    Filed: October 17, 2019
    Date of Patent: September 23, 2025
    Assignee: Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V.
    Inventors: Elke Metzsch-Zilligen, Rudolf Pfaendner
  • Patent number: 12398256
    Abstract: The invention relates to a method for stabilizing thermoplastic recyclates or previously damaged plastic materials against oxidative, thermal and/or actinic degradation. According to the claimed method, at least one substituted sugar, selected from the group consisting of at least one ester and/or ether of an alditol or cyclitol, at least one ester of a saccharic acid, at least one amide and/or substituted amine of an amine sugar, and mixtures and combinations thereof, as the stabilizing component is introduced in a thermoplastic recyclate and optionally additionally at least one primary antioxidant and/or at least one secondary antioxidant is introduced in a thermoplastic recyclate.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: August 26, 2025
    Assignee: Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V.
    Inventor: Rudolf Pfaendner
  • Publication number: 20250250414
    Abstract: The present invention relates to a method for stabilising transition-metal-containing plastics against oxidative, thermal and/or actinic degradation, in which method at least one sugar alcohol, in combination with at least one phenolic antioxidant, is introduced into a transition-metal-containing plastic. The method is performed in such a way that the resulting plastics composition, with additives introduced, has a total content of transition metals of at least 10 ppm (wt/wt). The present invention also relates to an accordingly produced, stabilised plastics composition, moulding compounds and moulded parts which can be produced from said composition and use of a stabiliser combination made of at least one sugar alcohol and at least one phenolic antioxidant for stabilising transition-metal-containing plastics.
    Type: Application
    Filed: April 12, 2023
    Publication date: August 7, 2025
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Heiko ASCHENBACH, Matthias AHLE, Elke METZSCH-ZILLIGEN, Rudolf PFAENDNER
  • Publication number: 20250154304
    Abstract: The present invention relates to polymeric stabilizers based on renewable raw materials from the group of methoxy-hydroxy benzoic acids, such as, for example, syringic acid, vanillic acid, isovanillic acid or 5-hydroxyveratric acid, to a plastic composition, to a method for stabilizing a plastic composition and to a stabilizer composition having a high stabilizing effect.
    Type: Application
    Filed: February 3, 2023
    Publication date: May 15, 2025
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventor: Rudolf PFAENDNER
  • Publication number: 20250122357
    Abstract: The present invention relates to stabilisers based on syringic acid, vanillic acid, isovanillic acid or 5-hydroxyveratric acid, plastic composition. The invention also relates to a method for stabilising a plastic composition and a stabiliser composition having a high stabilising effect.
    Type: Application
    Filed: November 9, 2022
    Publication date: April 17, 2025
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Rudolf PFAENDNER, Elke METZSCH-ZILLIGEN, Katrin MARKUS
  • Publication number: 20240254316
    Abstract: The invention relates to the use of at least one sulfur-containing amino acid for stabilizing recycled thermoplastics, in particular against oxidative, thermal, and/or actinic degradation, to a recycled thermoplastic composition containing or consisting of at least one recycled thermoplastic and at least one sulfur-containing amino acid, to a molded part which can be produced from the recycled thermoplastic composition according to the invention, to a stabilizer composition, to a masterbatch, and to a stabilizing method, in particular an oxidative, thermal, and/or actinic stabilizing method for stabilizing recycled thermoplastics by adding or incorporating at least one sulfur-containing amino acid, a stabilizer composition according to the invention, or a masterbatch according to the invention to a recycled thermoplastic.
    Type: Application
    Filed: May 18, 2022
    Publication date: August 1, 2024
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Rudolf PFAENDNER, Jannik MAYER, Elke METZSCH-ZILLIGEN
  • Publication number: 20240182683
    Abstract: The present invention relates to a new stabilizer composition on the basis of an aziridine and at least a hydrotalcite, zeolite, dawsonite or mixtures thereof. The stabilizer composition is suitable for stabilizing condensation polymers, in particular aliphatic polyesters against hydrolytic degradation. The invention also relates to the use of the stabilizer composition according to the invention and to a method for stabilizing condensation polymers against hydrolytic degradation. The present invention further relates to molded parts and moldings that can be produced from the composition according to the invention.
    Type: Application
    Filed: March 17, 2022
    Publication date: June 6, 2024
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Jannik HALLSTEIN, Elke METZSCH-ZILLIGEN, Rudolf PFAENDNER
  • Publication number: 20240182674
    Abstract: The invention relates to a new type of stabilizer composition for stabilizing halogen-free recycled thermoplastics. In addition, the present invention relates to a stabilizer composition, a master batch or concentrate, a stabilized plastic composition, a process for stabilizing halogen-free recycled thermoplastics and to possible uses of the composition.
    Type: Application
    Filed: February 25, 2022
    Publication date: June 6, 2024
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Rudolf PFAENDNER, Matthias POLIDAR, Elke METSCH-ZILLIGEN
  • Publication number: 20240174840
    Abstract: The present invention relates to the combined use of sulfite and/or at least one thiosulfate and a polymeric or oligomeric hindered amine for stabilizing organic materials, in particular against oxidative thermal and/or actinic degradation. The present invention further relates to correspondingly produced compositions, to moldings producible from these compositions, to a method for stabilizing organic materials and to possible uses of the stabilized organic materials.
    Type: Application
    Filed: March 1, 2022
    Publication date: May 30, 2024
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Rudolf PFAENDNER, Matthias POLIDAR, Elke METSCH-ZILLIGEN
  • Publication number: 20240043745
    Abstract: The present invention relates to the use of specific eugenol derivatives as stabilizers of organic materials against oxidative, thermal and/or actinic degradation. The present invention also relates to stabilized organic material and to specific eugenol derivatives which are suitable as stabilizers.
    Type: Application
    Filed: November 2, 2021
    Publication date: February 8, 2024
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Jannik MAYER, Elke METZSCH-ZILLIGEN, Rudolf PFAENDNER
  • Publication number: 20240026124
    Abstract: Disclosed is a method of stabilizing organic materials and plastics, wherein the method involves incorporating into the organic material or plastic a stabilizing compound selected from the group consisting of dieugenol, eugenol oligomers, eugenol cooligomers, eugenol polymers, and eugenol copolymers. A secondary antioxidant can be included further. Also disclosed are stabilized organic materials and plastics.
    Type: Application
    Filed: September 15, 2021
    Publication date: January 25, 2024
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventor: Rudolf PFAENDNER
  • Patent number: 11760865
    Abstract: The present invention relates to the use of halogen-free sulphonic acid esters and/or sulphinic acid esters as flame retardant and/or flame retardant synergists in plastics. The invention furthermore relates to the use of said compounds as radical generators in plastics, particularly in order to increase the molecular weight of the plastics, to branch and/or cross-link the plastics, to reduce the molecular weight of the plastics, to influence the molecular weight distribution of the plastics and to graft unsaturated monomers to the plastics. The present invention furthermore relates to the use of flame-retardant plastic compositions in the electrical or electronics industry, construction industry, transport industry, preferably automobiles, aircraft, trains and ships, for medical applications, for household appliances, vehicle parts, consumer products, packaging, furniture and textiles.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: September 19, 2023
    Assignee: Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V.
    Inventors: Rudolf Pfaendner, Thomas Driever, Anina Leipold, Elke Metzsch-Zilligen
  • Publication number: 20230203274
    Abstract: The invention relates to an additive composition comprising at least one hydroxycarboxylic acid salt and at least one organic phosphorus compound, said composition being capable of accelerating the hydrolytic decomposition of a thermoplastic condensation polymer upon working said additive composition into the condensation polymer. The invention additionally relates to a condensation polymer composition which is additivized with an additive composition according to the invention. The invention additionally relates to a method for the hydrolytic decomposition of a thermoplastic condensation polymer and to uses of the additive composition according to the invention and the thermoplastic condensation polymer composition.
    Type: Application
    Filed: April 16, 2021
    Publication date: June 29, 2023
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Matthias POLIDAR, Elke METZSCH-ZILLIGEN, Rudolf PFAENDNER
  • Publication number: 20230174746
    Abstract: The invention relates to an additive composition with inorganic sulfites, organic derivatives of sulfurous acid and/or thiosulfates, and organic phosphorus compounds, said composition being capable of accelerating the hydrolytic decomposition of a thermoplastic condensation polymer upon working said additive composition into the condensation polymer. The invention additionally relates to a condensation polymer composition which is additivized with an additive composition according to the invention. The invention additionally relates to a method for the hydrolytic decomposition of a thermoplastic condensation polymer and to uses of the additive composition according to the invention and the thermoplastic condensation polymer composition.
    Type: Application
    Filed: March 24, 2021
    Publication date: June 8, 2023
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Matthias POLIDAR, Elke METZSCH-ZILLIGEN, Rudolf PFAENDNER
  • Patent number: 11634560
    Abstract: The present invention relates to the use of efficient phosphorous substances, in particular based on diphenylamine and heterocyclic diphenylamine derivatives as stabilizers for organic materials, in particular for plastic materials, against oxidative, thermal and/or actinic degradation. The present invention additionally relates to an organic material that has been correspondingly stabilized as described above. The invention further relates to a method of stabilizing organic materials and to specific stabilizers.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: April 25, 2023
    Assignee: Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V.
    Inventors: Michael Ciesielski, Max Briesenick, Rudolf Pfaendner
  • Publication number: 20230117792
    Abstract: The present invention relates to the use of specific cinnamic acid esters as stabilizers of organic materials, in particular against oxidative, thermal and/or actinic degradation. The invention also relates to a corresponding stabilized organic material. The invention further relates to a method for stabilizing organic materials, in which specific cinnamic acid esters are incorporated into the organic material. According to the invention, specific new cinnamic acid esters are also disclosed.
    Type: Application
    Filed: March 19, 2021
    Publication date: April 20, 2023
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Rudolf PFAENDNER, Jannik MAYER, Elke METZSCH-ZILLIGEN
  • Publication number: 20230119120
    Abstract: The invention relates to the use of specific hydroycinnamic acid salts for stabilizing organic materials. The invention also relates to a corresponding organic material stabilized by incorporating a specific hydroxycinnamic acid salt, and to a method for stabilizing organic materials. In addition, a specific aluminum salt of a hydroxycinnamic acid suitable as an organic stabilizer is described. The invention further relates to a stabilizer composition comprising a corresponding hydroxycinnamic acid salt.
    Type: Application
    Filed: March 25, 2021
    Publication date: April 20, 2023
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Rudolf PFAENDNER, Jannik MAYER, Elke METZSCH-ZILLIGEN