Patents by Inventor Qinglan LIU

Qinglan LIU 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: 20240034828
    Abstract: The present invention relates to an aqueous polyurethane urea dispersion containing a polyurethane urea and a preparation process and use thereof, especially to the use in the field of coatings, adhesives or sealants, and the products obtained by coating, bonding or sealing with the polyurethane urea dispersion. The polyurethane urea of the aqueous polyurethane urea dispersion containing the polyurethane urea is obtained by the reaction of a system including the following components: a mixture of isocyanates, a polymer polyol, a monofunctional nonionic hydrophilic compound and a potentially anionic or anionic hydrophilic compound; said aqueous polyurethane urea dispersion has a viscosity of 5 s-18 s; relative to the total weight of said aqueous polyurethane urea dispersion, the amount of said polyurethane urea is 30 wt %-50 wt %. The aqueous polyurethane urea dispersion of the present invention has good compatibility with various organic solvents.
    Type: Application
    Filed: December 3, 2021
    Publication date: February 1, 2024
    Inventors: Limin Cheng, Qinglan Liu, Jinqi Li, Yingdan Zhu, Long Zhang
  • Patent number: 11760828
    Abstract: The present invention relates to a two-component system comprising a component A) comprising at least one polymeric polyol which has an OH content of ?4.5 wt %, based on the total solids content of the polymeric polyol, and a component B) comprising at least one polyisocyanate which has a number average isocyanate group functionality of ?4.0 to ?10.0, based on the total solids content of the polyisocyanate, a fraction of ?25 wt %, based on the total solids content of the polyisocyanate, of oligomers containing isocyanate groups and having a number-average molecular weight of ?780 g/mol, and an isocyanurate group fraction of ?5 mol % to ?70 mol %, based on the total amount of isocyanurate groups and allophanate groups in the polyisocyanate. The invention further relates to a method for producing a coating on a substrate, to the coating obtainable by this method, and to the coated substrate.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: September 19, 2023
    Assignee: Covestro Deutschland AG
    Inventors: Christoph Irle, Dieter Mager, Qinglan Liu, Limin Cheng
  • Publication number: 20210245418
    Abstract: The present invention relates to a thermoplastic composite article and a method of making the same. The method of preparing a thermoplastic composite article provided by the present invention comprises the steps of: a) coating a coating composition on one surface of a thermoplastic composite substrate; and b) allowing the substrate coated with the coating composition to be thermoformed in a forming mold to obtain the thermoplastic composite article. Compared with the prior art, the method of preparing a thermoplastic composite article provided by the present invention reduces the production steps such as overmolding and multiple spraying, decreases the warpage risk of the thermoplastic composite article, and simplifies the production process, thereby effectively improving the production efficiency and yield rate, in addition, it is also environmentally friendly.
    Type: Application
    Filed: June 3, 2019
    Publication date: August 12, 2021
    Inventors: Yilan LI, David HARTMANN, Qinglan LIU, Wen XU, Ke HONG, Jinqi LI
  • Publication number: 20210009851
    Abstract: The present invention relates to a coating composition and a method for preparing the same, a coating method and use thereof as well as a product coated with the coating composition. The coating composition comprises: A) a hydroxyl-containing component consisting of: a) a polycaprolactone polyol, b) a polyester polyol having a hydroxyl content of not less than 10 wt. % as measured in accordance with DIN EN ISO 4629-2, c) an optional polyacrylate polyol, and d) an optional polycarbonate polyol; and B) a polyisocyanate; wherein the equivalent ratio of isocyanate groups to hydroxyl groups of the composition is 0.5-1.2. A coating formed from the coating composition provided by the present invention has good reflowing, and especially can rapidly reflow at normal temperature.
    Type: Application
    Filed: February 8, 2019
    Publication date: January 14, 2021
    Inventors: Qinglan LIU, Wen XU, Jinqi LI
  • Publication number: 20210002510
    Abstract: The present invention relates to a coating composition and a method for preparing the same, a coating method and use thereof as well as a product coated with the coating composition. The coating composition comprises: A) a hydroxyl-containing component consisting of: a) a polyester-modified polycarbonate polyol having a number-average molecular weight of 500-6000 g/mol, the amount of which is greater than 50 wt. % based on that the weight of the hydroxyl-containing component is 100 wt. %, b) an optional polyester polyol having a hydroxyl content of not less than 10 wt. % as measured in accordance with DIN EN ISO 4629-2, and c) an optional polyacrylate polyol; and B) a polyisocyanate; wherein the equivalent ratio of isocyanate groups to hydroxyl groups of the composition is 0.5-1.2. A coating formed from the coating composition provided by the present invention has good appearance and adhesion as well as good reflowing, and especially can rapidly reflow at normal temperature.
    Type: Application
    Filed: February 8, 2019
    Publication date: January 7, 2021
    Inventors: Qinglan LIU, Wen XU, Jinqi LI
  • Publication number: 20200270390
    Abstract: The present invention relates to a two-component system comprising a component A) comprising at least one polymeric polyol which has an OH content of ?4.5 wt %, based on the total solids content of the polymeric polyol, and a component B) comprising at least one polyisocyanate which has a number average isocyanate group functionality of ?4.0 to ?10.0, based on the total solids content of the polyisocyanate, a fraction of ?25 wt %, based on the total solids content of the polyisocyanate, of oligomers containing isocyanate groups and having a number-average molecular weight of ?780 g/mol, and an isocyanurate group fraction of ?5 mol % to ?70 mol %, based on the total amount of isocyanurate groups and allophanate groups in the polyisocyanate. The invention further relates to a method for producing a coating on a substrate, to the coating obtainable by this method, and to the coated substrate.
    Type: Application
    Filed: August 21, 2018
    Publication date: August 27, 2020
    Inventors: Christoph IRLE, Dieter MAGER, Qinglan LIU, Limin CHENG