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    • 4. 发明申请
    • HIGH ACTIVITY CATALYST PREPARED WITH ALKOXYSILANES
    • 用烷氧基硅烷制备的高活性催化剂
    • WO99004901A1
    • 1999-02-04
    • PCT/US1998/014242
    • 1998-07-09
    • C08F4/658B01J21/08B01J31/02B01J31/12B01J31/14C08F4/02C08F4/58C08F4/64C08F10/00C08F10/02C08F210/16
    • B01J31/143B01J21/08B01J31/0274B01J31/122B01J31/128C08F10/00C08F10/02C08F210/16Y02P20/52C08F4/6565C08F210/14C08F2500/12C08F2500/03C08F4/6365
    • An ethylene-alpha-olefin copolymerization catalyst is prepared by impregnating a silica calcined at elevated temperature sequentially with an organomagnesium compound such as dialkylmagnesium compound, a silane compound which is free of hydroxyl groups, such as tetraethyl orthosilicate. A transition metal component such as titanium tetrachloride is then incorporated into the support. Unexpectedly, the calcination temperature of the silica used to prepare the catalyst precursors has a strong influence on polymer product properties. By increasing the calcination temperature of the silica from 600 DEG to 700 DEG C or higher temperatures, a catalyst precursor when activated produces ethylene/1-hexene copolymers with narrower molecular weight distributions (MWD) as manifested by a decrease of resin MFR values of SIMILAR 3-4 units. Activation of this catalyst precursor with a trialkylaluminum compound results in a catalyst system which is effective for the production of ethylene copolymers.
    • 乙烯-α-烯烃共聚催化剂是通过用有机镁化合物如二烷基镁化合物,不含羟基的硅烷化合物如原硅酸四乙酯依次浸渍在高温下煅烧的二氧化硅来制备的。 然后将过渡金属组分如四氯化钛加入到载体中。 出乎意料的是,用于制备催化剂前体的二氧化硅的煅烧温度对聚合物产物性能有很大的影响。 通过将二氧化硅的煅烧温度从600℃升高至700℃或更高的温度,当活化时催化剂前体产生具有较窄分子量分布(MWD)的乙烯/ 1-己烯共聚物,其表现为SIMILAR的树脂MFR值的降低 3-4个单位。 这种催化剂前体与三烷基铝化合物的活化导致催化剂体系对生产乙烯共聚物是有效的。
    • 10. 发明申请
    • CATALYST FOR POLYETHYLENE GIVING AN IMPROVED SHORT CHAIN BRANCHING DISTRIBUTION
    • 聚乙烯催化剂改善短链分配
    • WO01021676A1
    • 2001-03-29
    • PCT/GB2000/003536
    • 2000-09-14
    • B01J31/02B01J31/12B01J31/14B01J37/02B01J37/06C08F4/654C08F4/656C08F4/658C08F10/02
    • B01J31/143B01J31/0274B01J31/122B01J37/0203B01J37/0205C08F10/02C08F4/6365
    • The present invention provides a catalyst composition for polymerising ethylene with a superior activity, productivity, and giving, in particular, copolymers with an improved narrower short chain branching distribution, and especially an improved cling development in PIB formulated films. Said catalyst composition for the (co-)polymerisation of ethylene, optionally with an alpha olefin of 3 to 10 carbon atoms, comprises a catalyst precursor and an organoaluminium cocatalyst, wherein the catalyst precursor comprises i) a catalyst carrier material, having from 0.3 to 1.2 mmoles of OH groups per gram of catalyst carrier, more preferably from 0.3 to 0.8, ii) a dialkylmagnesium compound of the formula RMgR , where R and R are the same or different C2-C12 alkyl groups, in an amount comprised between 1.1 and 2.4 mmoles of dialkylmagnesium per gram of catalyst carrier, preferably between 1.3 and 2.4, more preferably between 1.3 and 1.8, iii) a tetraalkyl orthosilicate, in which the alkyl group contains from 2 to 6 carbon atoms, in an amount comprised between 0.4 and 1.6 mmoles of tetraalkyl orthosilicate per gram of catalyst carrier, more preferably between 0.6 and 1.3, and iv) a titanium compound in an amount comprised between 1.3 to 2.4 mmoles per gram of catalyst carrier, more preferably between 1.3 and 1.8.
    • 本发明提供了一种聚合乙烯的催化剂组合物,其具有优异的活性,生产率,特别是具有改进的较窄的短链支化分布的共聚物,特别是PIB配制的膜中的改进的粘附显影。 用于乙烯(任选与3-10个碳原子的α-烯烃)(共))聚合的所述催化剂组合物包括催化剂前体和有机铝助催化剂,其中催化剂前体包括i)催化剂载体材料,其具有0.3至 每克催化剂载体为1.2毫摩尔OH基,更优选为0.3至0.8,ii)式RMgR 1的二烷基镁化合物,其中R和R 1为相同或不同的C 2 -C 12烷基, 每克催化剂载体包含1.1-2.4毫摩尔二烷基镁,优选在1.3和2.4之间,更优选在1.3和1.8之间的量,iii)其中烷基含有2至6个碳原子的原硅酸四烷基酯, 每克催化剂载体含有0.4-1.6毫摩尔原硅酸四烷基酯,更优选在0.6至1.3之间,和iv)钛化合物,其量为每克催化剂载体1.3-2.4毫摩尔 r,更优选在1.3和1.8之间。