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    • 42. 发明授权
    • Olefin polymerization method
    • 烯烃聚合法
    • US4460756A
    • 1984-07-17
    • US479238
    • 1983-03-28
    • Max P. McDanielJohn A. SanbranoMarvin M. Johnson
    • Max P. McDanielJohn A. SanbranoMarvin M. Johnson
    • B01J23/26C08F10/00
    • B01J23/26C08F10/00
    • A supported chromium oxide polymerization catalyst is prepared by a process which includes the steps of heating silica-supported chromium oxide or a substance oxidizable to chromium oxide in a nonoxidizing atmosphere in the presence of formaldehyde or a compound thermally decomposable to formaldehyde, and then heating the thus-treated catalyst in an oxygen-containing atmosphere. The temperatures of the respective heating steps can vary depending upon the properties desired in the polymer to be produced with the invention catalyst; however, the invention catalyst preparation method enables the production of a catalyst having a high melt index potential at relatively low treatment temperatures, e.g. no higher than about 600.degree. C.
    • 一种负载型氧化铬聚合催化剂的制备方法包括以下步骤:在甲醛或可热分解成甲醛的化合物的存在下,在非氧化性气氛中加热二氧化硅负载的氧化铬或氧化铬的物质,然后加热 在含氧气氛中处理的催化剂。 各加热步骤的温度可以根据本发明催化剂生产的聚合物中所需的性能而变化; 然而,本发明的催化剂制备方法使得能够在相对低的处理温度下制备具有高熔体指数电位的催化剂,例如, 不高于约600℃
    • 43. 发明授权
    • Olefin polymerization with phosphate supported zerovalent chromium
    • 烯烃聚合与磷酸盐支持零价铬
    • US4444968A
    • 1984-04-24
    • US424803
    • 1982-09-27
    • Max P. McDanielMarvin M. Johnson
    • Max P. McDanielMarvin M. Johnson
    • C08F10/00C08F4/02C08F4/62
    • C08F10/00
    • In accordance with one embodiment of this invention, a zerovalent chromium compound is introduced onto an activated phosphate-containing support and utilized in conjunction with an organometal cocatalyst, such as a trialkylborane. In accordance with another embodiment of this invention, a phosphate-containing xerogel is formed by removing water from an aluminum phosphate-containing hydrogen by means of azeotropic distillation or washing with a volatile, water miscible organic compound, activated and thereafter zerovalent chromium is incorporated therewith. In other embodiments of this invention, a phosphate-containing support is formed by forming aluminum phosphate from an aluminum alkoxide or from a melt, or by phosphating silica or alumina, or by forming an aluminum phosphate/silica combination. A support thus formed is activated and a zerovalent chromium compound added. The resulting catalysts are capable of giving high melt index, broad molecular weight distribution polymer, which polymer also exhibits other deviations from typical olefin polymers including lower flexural modulus. The catalyst is ideally suited for forming olefin polymers such as ethylene and ethylene copolymers in a slurry system.
    • 根据本发明的一个实施方案,将零价铬化合物引入到活化的含磷酸盐载体上并与有机金属助催化剂如三烷基硼烷结合使用。 根据本发明的另一个实施方案,通过共沸蒸馏或用挥发性水混溶性有机化合物洗涤来从含磷酸氢盐的氢中除去水而形成含磷酸的干凝胶,然后活化其中的零价铬 。 在本发明的其他实施方案中,通过由烷氧基铝或熔体形成磷酸铝,或通过磷酸二氧化硅或氧化铝,或通过形成磷酸铝/二氧化硅组合形成含磷酸盐的载体。 如此形成的载体被活化并加入零价铬化合物。 所得到的催化剂能够提供高熔体指数,宽分子量分布的聚合物,该聚合物还表现出与典型烯烃聚合物的其它偏差,包括较低的弯曲模量。 该催化剂理想地适用于在淤浆体系中形成烯烃聚合物如乙烯和乙烯共聚物。