Patents by Inventor Rongmei Liu

Rongmei 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).

  • Propylene polymer composition and oriented film prepared thereby
    Patent number: 7611776
    Abstract: The present invention provides a propylene polymer composition for producing a biaxially oriented film, comprising propylene random copolymer and propylene homopolymer; wherein the propylene random copolymer is a copolymer of propylene and ethylene, optionally comprising one or more alpha-olefins of C4-C10; the propylene polymer composition has an overall isotacticity index, as determined by nuclear magnetic resonance method, of greater than or equal to 96.5%, and an ethylene content of greater than 0.3 wt %; and wherein, the melt flow rate of the propylene random copolymer is lower than that of the propylene homopolymer. The biaxially oriented polypropylene film produced by the propylene polymer composition of the present invention exhibits excellent physical properties, and has, in the absence of any stiffening agent, relatively higher modulus and stiffness.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: November 3, 2009
    Assignees: China Petrochemical & Chemical Corporation, Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation
    Inventors: Luqiang Yu, Meifang Guo, Shijun Zhang, Jinliang Qiao, Wenbo Song, Qingshan Ma, Wei Zhang, Liangshi Wang, Xi Wang, Hao Tang, Rongmei Liu
  • Propylene polymer composition and oriented film prepared thereby
    Publication number: 20060182987
    Abstract: The present invention provides a propylene polymer composition for producing a biaxially oriented film, comprising propylene random copolymer and propylene homopolymer; wherein the propylene random copolymer is a copolymer of propylene and ethylene, optionally comprising one or more alpha-olefins of C4-C10; the propylene polymer composition has an overall isotacticity index, as determined by nuclear magnetic resonance method, of greater than or equal to 96.5%, and an ethylene content of greater than 0.3 wt %; and wherein, the melt flow rate of the propylene random copolymer is lower than that of the propylene homopolymer. The biaxially oriented polypropylene film produced by the propylene polymer composition of the present invention exhibits excellent physical properties, and has, in the absence of any stiffening agent, relatively higher modulus and stiffness.
    Type: Application
    Filed: January 24, 2006
    Publication date: August 17, 2006
    Inventors: Luqiang Yu, Meifang Guo, Shijun Zhang, Jinliang Qiao, Wenbo Song, Qingshan Ma, Wei Zhang, Liangshi Wang, Xi Wang, Hao Tang, Rongmei Liu