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    • 100. 发明授权
    • Polymerization process using catalysts comprising chromium on
silica/phosphate support
    • 使用在二氧化硅/磷酸盐载体上包含铬的催化剂的聚合方法
    • US4444963A
    • 1984-04-24
    • US423595
    • 1982-09-27
    • Max P. McDanielMarvin M. Johnson
    • Max P. McDanielMarvin M. Johnson
    • C08F10/00C08F4/02C08F4/24C08F4/62
    • C08F10/00
    • In one embodiment of this invention, a chromium component is supported on a silica/aluminum orthophosphate combination and used with an organometal cocatalyst. In accordance with other embodiments of the invention, the silica/phosphate combination for a chromium catalyst support is produced by either impregnating a silica xerogel with aluminum phosphate or boron phosphate, precipitating aluminum phosphate in the presence of a silica hydrogel, or physically mixing silica and aluminum phosphate xerogels. The resulting catalysts are capable of producing high melt flow olefin polymers and exhibit high activity. The resulting polymers have many unusual and desirable characteristics, such as high density and good environmental stress crack resistance.
    • 在本发明的一个实施方案中,铬组分负载在二氧化硅/正磷酸铝组合上并与有机金属助催化剂一起使用。 根据本发明的其它实施方案,用于铬催化剂载体的二氧化硅/磷酸盐组合是通过用磷酸铝或磷酸硼浸渍二氧化硅干凝胶,在二氧化硅水凝胶的存在下沉淀磷酸铝,或物理混合二氧化硅和 磷酸铝干凝胶。 所得催化剂能够生产高熔体流动的烯烃聚合物并表现出高的活性。 所得到的聚合物具有许多不寻常和期望的特征,例如高密度和良好的耐环境应力开裂性。