Patents by Inventor Nairan Zhang

Nairan Zhang 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).

  • Thermoplastic elastomeric block copolymers and process for the preparation thereof
    Patent number: 6140433
    Abstract: This invention relates to a thermoplastic elastomeric block copolymer and process for the preparation thereof. According to this invention, the block copolymer obtained through block copolymerization process at higher temperature and adding butyllithium in twice during copolymerization are mixed block copolymer of A.sub.1 -B-A.sub.2 /B-A.sub.2 and B-A.sub.2 /B-A.sub.2 (where A represents monovinyl aromatic monomer; B represents conjugated diene monomer) having different blocks, higher elongation and appropriate melt index. The process of this invention is simple and efficient. The thermoplastic elastomeric block copolymer of this invention are particularly useful for various applications of typical styrene butadiene block copolymer, especially plastic modifier.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: October 31, 2000
    Assignees: China Petrochemical Corporation, Research Institute of Beijing Yanshan Petrochemical Corporation
    Inventors: Nairan Zhang, Wenjuan Sun