MODIFIED OLEFIN (CO)POLYMER COMPOSITION, PROCESS FOR PREPARING THE SAME, AND MODIFIED OLEFIN (CO)POLYMER COMPOSITION MOLDING
申请人:CHISSO CORPORATION
公开号:EP0972800A1
公开(公告)日:2000-01-19
A high molecular weight polyethylene prepared by preliminary polymerization is added at the time of main polymerization of an olefin, for example, propylene, to prepare an olefin (co)polymer composition comprising the above high molecular weight polyethylene finely dispersed as fine particles in the polyolefin, such as polypropylene, and a cross-linked structure is formed in the olefin (co)polymer composition. This process can provide a modified olefin (co)polymer composition improved in the strength in a molten state in terms of melt tension or the like and in crystallization temperature and excellent in moldability such as high-speed producibility and a molded modified olefin (co)polymer composition excellent in properties such as heat resistance and rigidity.
在对烯烃(例如丙烯)进行主聚合时,加入通过预聚合制备的高分子量聚乙烯,以制备烯烃(共)聚合物组合物,该组合物由上述高分子量聚乙烯以细颗粒形式分散在聚烯烃(例如聚丙烯)中组成,并在烯烃(共)聚合物组合物中形成交联结构。这种工艺可以提供一种改性烯烃(共)聚合物组合物,它在熔融状态下的强度(如熔体张力等)和结晶温度方面都有所提高,并具有优异的成型性(如高速生产性),而且成型的改性烯烃(共)聚合物组合物具有优异的性能(如耐热性和刚性)。