会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明授权
    • Particulate group 4 metallocene-aluminoxane catalyst compositions devoid of preformed support, and their preparation and their use
    • 没有预形成载体的颗粒组4茂金属 - 铝氧烷催化剂组合物及其制备及其应用
    • US06746981B2
    • 2004-06-08
    • US10323171
    • 2002-12-18
    • Steven P. Diefenbach
    • Steven P. Diefenbach
    • C08F464
    • C08F10/02C08F4/65927C08F110/02Y10S526/943C08F4/65912C08F2500/24
    • Described are solid olefin polymerization catalysts that have, inter alia, very high productivities (at least 18,000 grams of polyethylene per gram of catalyst in one hour) as shown by a standard test procedure for measuring this property or characteristic. Such particulate catalysts can be prepared by prepolymerizing vinylolefin with a Group 4 metallocene-aluminoxane solution, using proportions of vinylolefin (most preferably, ethylene) in the range of about 150 to about 1500, and preferably in the range of about 175 to about 1000, moles per mole of Group 4 metallocene used in forming the solution. The atom ratio of aluminum to Group 4 metal in the solution is in the range of about 150:1 to about 1500:1, and preferably in the range of about 175:1 to about 1000:1. In addition, the Group 4 metallocene ingredient used in forming these highly productive catalysts has in its molecular structure at least one polymerizable olefinic substituent. These particulate catalysts do not contain, and thus are not produced in the presence of, a preformed support such as an inorganic compound (silica or etc.) or a preformed particulate polymeric support.
    • 描述的是固体烯烃聚合催化剂,其特别是具有非常高的生产率(在1小时内每克催化剂至少18,000克聚乙烯),如用于测量该性质或特性的标准测试程序所示。 这样的颗粒催化剂可以通过将乙烯基烯烃与第4族茂金属 - 铝氧烷溶液预聚合来制备,使用在约150至约1500范围内,优选在约175至约1000范围内的乙烯(优选乙烯) 摩尔每摩尔用于形成溶液的4族茂金属。 溶液中铝与第4族金属的原子比在约150:1至约1500:1的范围内,优选在约175:1至约1000:1的范围内。 此外,用于形成这些高产率催化剂的4族金属茂成分在其分子结构中具有至少一个可聚合的烯属取代基。 这些颗粒催化剂不含预先形成的载体例如无机化合物(二氧化硅等)或预成型颗粒状聚合物载体,因此不会生成。
    • 5. 发明授权
    • Process for the polymerization of alpha olefins
    • α-烯烃聚合方法
    • US06649712B2
    • 2003-11-18
    • US10045875
    • 2001-11-07
    • John A. Ewen
    • John A. Ewen
    • C08F464
    • C08F10/00C07F17/00C08F4/63912C08F4/63927C08F4/65912C08F110/02C08F110/06Y10S526/943C08F4/65927C08F2500/17C08F2500/03C08F2500/15
    • The present invention provides a method for varying the melting points and molecular weights of polyolefins by changing the structure of the catalyst used in the polymerization. The catalysts that are useful in the present invention are chiral, stereorigid metallocene catalyst of the formula R″(C5R″m)2MeQ. The catalysts include a bridge structure between the (C5R′m) groups and may contain substituents on the groups. It has been discovered that the melting points and molecular weights of the polymers produced by such catalysts are influenced by the bridge and substituents added to the (C5R′m) groups. Thus, the present invention provides a method for varying the melting points of the polymer product and a method of varying the molecular weights of the product by changing the components and structure of the metallocene catalysts. The present invention also provides a process for polymerizing olefins in which the melting points and/or molecular weights of the product may be controlled. Also included in the invention is the discovery that the melting points of the products are controlled by the number of inversions in the xylene insoluble fraction of the polymer.
    • 本发明提供了通过改变聚合中使用的催化剂的结构来改变聚烯烃的熔点和分子量的方法。 可用于本发明的催化剂是式R“(C5R''m)2MeQ的手性,立体刚性茂金属催化剂。 催化剂包括(C5R'm)基团之间的桥结构,并且可以在基团上含有取代基。 已经发现,由这些催化剂制备的聚合物的熔点和分子量受加入(C5R'm)基团的桥和取代基的影响。 因此,本发明提供了改变聚合物产物的熔点的方法和通过改变茂金属催化剂的组分和结构来改变产物分子量的方法。 本发明还提供了可以控制产物的熔点和/或分子量的烯烃聚合方法。 本发明还包括以下发现:产物的熔点由聚合物的二甲苯不溶部分的反转次数控制。