Patents by Inventor Guan-yi Shi

Guan-yi Shi 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).

  • Beta-crystalline form of isotactic polypropylene and method for forming the same
    Patent number: 5231126
    Abstract: This invention relates to obtaining beta crystalline Phase isotactic polypropylene with high purity and thermal stability simply by melt-crystallization in the presence of a two component beta nucleating agent. The two component beta-nucleating agent is formed by mixing 0.0001-1 weight % of dibasic acid with 0.001-1 weight % oxide, hydroxide or acid salt of a Group IIA metal. Such beta phase polypropylene can be used for the production of high impact strength molding extrusion shapes, microporous film and microporous hollow fiber.
    Type: Grant
    Filed: February 9, 1989
    Date of Patent: July 27, 1993
    Inventors: Guan-yi Shi, Jing-yun Zhang, Hesheng Jing