Patents by Inventor Bajin CHEN

Bajin CHEN 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).

  • 2,2-dimethyl-1,3-dioxolan-4-yl-methyl 2-bromo-2,2-difluoroacetate, waterborne polyurethane, and preparation methods thereof
    Patent number: 12240938
    Abstract: Disclosed are (2,2-dimethyl-1,3-dioxolan-4-yl)methyl 2-bromo-2,2-difluoroacetate, a waterborne polyurethane, and preparation methods thereof. The (2,2-dimethyl-1,3-dioxolan-4-yl)methyl 2-bromo-2,2-difluoroacetate could be used as a modified monomer for preparing a waterborne polyurethane, and substituents at a C2 position of the (2,2-dimethyl-1,3-dioxolan-4-yl)methyl 2-bromo-2,2-difluoroacetate are two fluorine atoms and one bromine atom. When it is used for preparing the waterborne polyurethane, fluorine and bromine groups are introduced into the structure of the waterborne polyurethane, and the resultant waterborne polyurethane exhibits good moisture resistance and flame retardance.
    Type: Grant
    Filed: December 30, 2021
    Date of Patent: March 4, 2025
    Assignees: Hangzhou Transfar Fine Chemical Co., Ltd., Hangzhou Normal University
    Inventors: Shengpeng Wang, Bajin Chen, Weiming Xu, Jinxing Song, Pengfei Zhang, Xiaojun Wang, Bencheng Yu, Youju Huang, Xiaobo Yang
  • 2,2-DIMETHYL-1,3-DIOXOLAN-4-YL - METHYL 2-BROMO-2,2-DIFLUOROACETATE,WATERBORNE POLYURETHANE, AND PREPARATION METHODS THEREOF
    Publication number: 20230103217
    Abstract: Disclosed are (2,2-dimethyl-1,3-dioxolan-4-yl)methyl 2-bromo-2,2-difluoroacetate, a waterborne polyurethane, and preparation methods thereof. The (2,2-dimethyl-1,3-dioxolan-4-yl)methyl 2-bromo-2,2-difluoroacetate could be used as a modified monomer for preparing a waterborne polyurethane, and substituents at a C2 position of the (2,2-dimethyl-1,3-dioxolan-4-yl)methyl 2-bromo-2,2-difluoroacetate are two fluorine atoms and one bromine atom. When it is used for preparing the waterborne polyurethane, fluorine and bromine groups are introduced into the structure of the waterborne polyurethane, and the resultant waterborne polyurethane exhibits good moisture resistance and flame retardance.
    Type: Application
    Filed: December 30, 2021
    Publication date: March 30, 2023
    Inventors: Shengpeng WANG, BAJIN CHEN, WEIMING XU, JINXING SONG, PENGFEI ZHANG, XIAOJUN WANG, BENCHENG YU, YOUJU HUANG, XIAOBO YANG
  • Method for preparing alkynyl 2-halo-2,2-difluoroacetate
    Patent number: 11242307
    Abstract: A method for preparing alkynyl 2-halo-2,2-difluoroacetate is disclosed. The method comprises: subjecting a 2-halo-2,2-difluoro acetic acid, an alkynol, and a catalyst to an esterification reaction in a solvent, to obtain alkynyl 2-halo-2,2-difluoroacetate, wherein the catalyst includes one or more of sulfuric acid, phosphoric acid and p-toluenesulfonic acid.
    Type: Grant
    Filed: October 1, 2020
    Date of Patent: February 8, 2022
    Assignees: Hangzhou Transfar Fine Chemical Co., Ltd., Hangzhou Normal University, Zhejiang Transfar Functional New Material Co., Ltd.
    Inventors: Pengfei Zhang, Shengpeng Wang, Wanmei Li, Weiming Xu, Bajin Chen, Xiaojun Wang
  • METHOD FOR PREPARING ALKYNYL 2-HALO-2,2-DIFLUOROACETATE
    Publication number: 20220033339
    Abstract: A method for preparing alkynyl 2-halo-2,2-difluoroacetate is disclosed. The method comprises: subjecting a 2-halo-2,2-difluoro acetic acid, an alkynol, and a catalyst to an esterification reaction in a solvent, to obtain alkynyl 2-halo-2,2-difluoroacetate, wherein the catalyst includes one or more of sulfuric acid, phosphoric acid and p-toluenesulfonic acid.
    Type: Application
    Filed: October 1, 2020
    Publication date: February 3, 2022
    Inventors: Pengfei ZHANG, Shengpeng WANG, Wanmei LI, Weiming XU, Bajin CHEN, Xiaojun WANG