Patents by Inventor Liuwen Ruan

Liuwen Ruan 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 synthesizing polybutylene adipate terephthalate-polylactic acid (PBAT-PLA) copolyester
    Patent number: 10875958
    Abstract: A method for synthesizing a polybutylene adipate terephthalate-polylactic acid (PBAT-PLA) copolyester, the method including: uniformly blending a first prepolymer PBAT and a second prepolymer PLA to yield a mixture, 0putting the mixture in a vacuum reactor with a vacuum degree of between 5 and 100 pascal, heating the vacuum reactor to a temperature of between 100 and 110° C., and allowing to react for between 0.5 and 1 hr; stepwise increasing the temperature to be between 145 and 155° C. in between 1 and 2 hrs, and allowing to react for between 5 and 10 hrs, to yield a PBAT-PLA copolyester with a weight-average molecular weight of between 100000 and 250000. The method for synthesizing the PBAT-PLA copolyester is eco-friendly, non-toxic and cost-efficient.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: December 29, 2020
    Assignee: Henan Green Polymer Co., Ltd
    Inventors: Liuwen Ruan, Wanxin Li, Yongbin Tang, Xinyu He, Wenjun Yang, Bin Mao
  • METHOD FOR SYNTHESIZING POLYBUTYLENE ADIPATE TEREPHTHALATE-POLYLACTIC ACID (PBAT-PLA) COPOLYESTER
    Publication number: 20190330416
    Abstract: A method for synthesizing a polybutylene adipate terephthalate-polylactic acid (PBAT-PLA) copolyester, the method including: uniformly blending a first prepolymer PBAT and a second prepolymer PLA to yield a mixture, putting the mixture in a vacuum reactor with a vacuum degree of between 5 and 100 pascal, heating the vacuum reactor to a temperature of between 100 and 110° C., and allowing to react for between 0.5 and 1 hr; stepwise increasing the temperature to be between 145 and 155° C. in between 1 and 2 hrs, and allowing to react for between 5 and 10 hrs, to yield a PBAT-PLA copolyester with a weight-average molecular weight of between 100000 and 250000. The method for synthesizing the PBAT-PLA copolyester is eco-friendly, non-toxic and cost-efficient.
    Type: Application
    Filed: October 17, 2017
    Publication date: October 31, 2019
    Applicants: Henan Green Polymer Co., Ltd, Henan Green Polymer Co., Ltd
    Inventors: Liuwen Ruan, Wanxin Li, Yongbin Tang, Xinyu He, Wenjun Yang, Bin Mao