Patents by Inventor Zhaoquing Liu

Zhaoquing 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).

  • Process for producing polyether-polyester block copolymer
    Patent number: 8779084
    Abstract: The present invention discloses a process for producing a polyether-polyester block copolymer with a di(C 1-C 4)alkyl ester of aromatic dicarboxylic acid, an aliphatic diol or aliphatic polyol and a polyether having at least one terminal hydroxyl group in an inert solvent. In the present invention, the inert solvent 5 is used to prevent the di(C 1-C 4)alkyl ester of aromatic dicarboxylic acid from sublimation instead of excessive polyol, such that the subsequent removal of excessive polyol under high temperature and high vacuum is avoided.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: July 15, 2014
    Assignee: Solvay (China) Co., Ltd.
    Inventors: Zhaoquing Liu, Daobing Lin, Qiaobo Li