Patents by Inventor Yihuan Liu

Yihuan 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).

  • Method for preparing mercapto functional polyester polyols
    Patent number: 10214755
    Abstract: A method to prepare functional polyester polyols by using micro-reaction device, wherein mixing ?-caprolactone/?-valerolactone monomer with mercapto alcohol evenly with appropriate organic solution under moistureless conditions, and continuously transferring the prepared mixing solution into a micro-reaction device supported with an immobilized enzyme for polymerization to synthetize a poly (?-caprolactone/?-valerolactone). Compared with the prior art, the present invention achieves a continuous production by using immobilized lipase Novozyme435 as a catalyst.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: February 26, 2019
    Assignee: NANJING TECH UNIVERSITY
    Inventors: Kai Guo, Weijun Huang, Ning Zhu, Xin Hu, Zheng Fang, Yihuan Liu
  • Method for one-step synthesis of functional polyesters by organic catalysis
    Patent number: 10040898
    Abstract: It relates to the field of synthetic macromolecular chemistry, and discloses a method for one-step synthesis of thiol-functionalized polyester polyols by organic catalysis. This method uses lactone monomer as reaction raw material, thiol-alcohol as initiator, and diphenyl phosphate as organic catalyst to catalyze and synthesize the thiol-functionalized polyester polyols. The present invention provides a method which is simple, inexpensive, easily controllable and environmentally friendly to prepare thiol-functionalized polyester polyols with the easily available and controllable catalyst. The method can selectively catalyze the ring opening polymerization of lactone to prepare thiol-functionalized polyester polyols using the organic catalyst.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: August 7, 2018
    Assignee: NANJING TECH UNIVERSITY
    Inventors: Kai Guo, Yihuan Liu, Ning Zhu, Xin Hu, Zheng Fang, Weiyang Feng, Weijun Huang
  • METHOD FOR ONE-STEP SYNTHESIS OF FUNCTIONAL POLYESTERS BY ORGANIC CATALYSIS
    Publication number: 20170081468
    Abstract: It relates to the field of synthetic macromolecular chemistry, and discloses a method for one-step synthesis of thiol-functionalized polyester polyols by organic catalysis. This method uses lactone monomer as reaction raw material, thiol-alcohol as initiator, and diphenyl phosphate as organic catalyst to catalyze and synthesize the thiol-functionalized polyester polyols. The present invention provides a method which is simple, inexpensive, easily controllable and environmentally friendly to prepare thiol-functionalized polyester polyols with the easily available and controllable catalyst. The method can selectively catalyze the ring opening polymerization of lactone to prepare thiol-functionalized polyester polyols using the organic catalyst.
    Type: Application
    Filed: November 30, 2016
    Publication date: March 23, 2017
    Inventors: Kai Guo, Yihuan Liu, Ning Zhu, Xin Hu, Zheng Fang, Weiyang Feng, Weijun Huang
  • Method to prepare the mercapto functional polylactone by utilizing the enzyme immobilized microreactor
    Publication number: 20170073709
    Abstract: A method to prepare functional polyester polyols by using micro-reaction device, wherein mixing ?-caprolactone/?-valerolactone monomer with mercapto alcohol evenly with appropriate organic solution under moistureless conditions, and continuously transferring the prepared mixing solution into a micro-reaction device supported with an immobilized enzyme for polymerization to synthetize a poly (?-caprolactone/?-valerolactone). Compared with the prior art, the present invention achieves a continuous production by using immobilized lipase Novozyme435 as a catalyst.
    Type: Application
    Filed: November 16, 2016
    Publication date: March 16, 2017
    Applicant: NANJING TECH UNIVERSITY (CN)
    Inventors: Kai GUO, Weijun Huang, Ning Zhu, Xin Hu, Zheng Fang, Yihuan Liu