Patents by Inventor Huifeng Yu

Huifeng Yu 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: 11807025
    Abstract: A plastic material is useful as an ink receiver or printing medium in dye diffusion thermal transfer printing, wherein the plastic material has a polyamide component (a), and a (co)-polyamide (b) based on ether units and amide units. This plastic material can be used to make a layered structure. The layered structure can be used in dye diffusion thermal transfer printing. A security and/or valuable document with the layered structure can be obtained. Based on the finding that the (co)-polyamide (h) offers sufficient absorbency for the printing ink, the layer produced from the plastic material can be printed on by means of dye diffusion thermal transfer printing with a good color intensity.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: November 7, 2023
    Assignees: Evonik Operations GmbH, Evonik Specialty Chemicals (Shanghai) Co., Ltd.
    Inventors: Huifeng Yu, Jianmin Yang, Fei Teng, Chenyu Ye, Florian Hermes, Martin Wielpütz
  • Publication number: 20210268823
    Abstract: A polymer based composite contains (a) a polyamide component, (b) a (co)-polyamide based on ether units and amide units, and (c) carbon black. It has been found that (1) the (co)-polyamide (b) offers sufficient absorbency for the printing ink, and (2) the selection of the polyamide component, the (co)-polyamide, and the amount of the carbon black result in both sufficient transparency and sufficient absorption centers for the laser energy. A moulded article can be made of the polymer based composite. A layered structure can be made containing at least one layer made of the polymer based composite and a security and/or valuable document containing the layered structure.
    Type: Application
    Filed: June 29, 2018
    Publication date: September 2, 2021
    Applicants: Evonik Specialty Chemicals (Shanghai) Co., Ltd., Evonik Operations Gmbh
    Inventors: Huifeng Yu, Jianmin Yang, Fei Teng, Florian Hermes, Chenyu Ye
  • Publication number: 20210213717
    Abstract: A laser markable polymer composite contains (a) a polyamide component as the matrix and (b) carbon black as a laser-sensitive additive. The polyamide component has, based on the total weight thereof, at least 50 wt % a poly amide selected from a linear aliphatic polyamide (a1) or (a2), a cycloaliphatic polyamide (a3), a semi-aromatic polyamide (a4) or (a5), and the compound or copolymer thereof. The carbon black is present in an amount of 50-300 ppm, based on the total weight of the polymer composite. The composite results in better chemical resistance than conventional polycarbonate as the matrix, in addition to a desired quality of laser marking, specifically sharpness and resolution. This composite can also be used for a moulded article made of the laser markable polymer composite, a layered structure with at least one layer made of the laser markable polymer composite, and a security and/or valuable document with the layered structure.
    Type: Application
    Filed: May 25, 2018
    Publication date: July 15, 2021
    Applicants: Evonik Operations GmbH, Evonik Specialty Chemicals (Shanghai) Co., Ltd.
    Inventors: Huifeng YU, Jianmin Yang, Fei Teng, Florian Hermes, Rainer Göring, Chenyu Ye
  • Publication number: 20210206187
    Abstract: A plastic material is useful as an ink receiver or printing medium in dye diffusion thermal transfer printing, wherein the plastic material has a polyamide component (a), and a (co)-polyamide (b) based on ether units and amide units. This plastic material can be used to make a layered structure. The layered structure can be used in dye diffusion thermal transfer printing. A security and/or valuable document with the layered structure can be obtained. Based on the finding that the (co)-polyamide (b) offers sufficient absorbency for the printing ink, the layer produced from the plastic material can be printed on by means of dye diffusion thermal transfer printing with a good color intensity.
    Type: Application
    Filed: May 25, 2018
    Publication date: July 8, 2021
    Applicants: Evonik Operations GmbH, Evonik Specialty Chemicals (Shanghai) Co., Ltd.
    Inventors: Huifeng Yu, Jianmin Yang, Fei Teng, Chenyu Ye, Florian Hermes, Martin Wielpütz