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    • 4. 发明授权
    • Processes for making multimodal molecular weight distribution polyolefins
    • 制备多峰分子量分布聚烯烃的方法
    • US08691714B2
    • 2014-04-08
    • US13401147
    • 2012-02-21
    • Matthew W. HoltcampMatthew S. Bedoya
    • Matthew W. HoltcampMatthew S. Bedoya
    • C08F4/61C08F4/615C08F4/6592C08F4/69
    • C08F10/00C08F4/63925C08F4/65912C08F4/65916C08F4/65925C08F110/02C08F2500/05C08F4/63904
    • This invention relates to a process to make a multimodal polyolefin composition comprising: (i) contacting at least one first olefin monomer with a mixed catalyst system, under polymerization conditions, to produce at least a first polyolefin component having a Mw of 5,000 g/mol to 600,000 g/mol, wherein the mixed catalyst system comprises: (a) at least one polymerization catalyst comprising a Group 4 or Group 5 transition metal; (b) at least one organochromium polymerization catalyst; (c) an activator; and (d) a support material; (ii) thereafter, contacting the first polyolefin component/mixed catalyst system combination with a molecular switch; (iii) contacting the first polyolefin component/mixed catalyst system combination with at least one second olefin monomer, which may be the same or different, under polymerization conditions; and (iv) obtaining a multimodal polyolefin composition.
    • 本发明涉及一种制备多峰聚烯烃组合物的方法,其包括:(i)在聚合条件下使至少一种第一烯烃单体与混合催化剂体系接触,以产生至少一种Mw为5,000g / mol的第一聚烯烃组分 至600,000g / mol,其中所述混合催化剂体系包含:(a)至少一种包含第4族或第5族过渡金属的聚合催化剂; (b)至少一种有机铬聚合催化剂; (c)活化剂; 和(d)支撑材料; (ii)之后,使第一聚烯烃组分/混合催化剂体系组合与分子开关接触; (iii)在聚合条件下使第一聚烯烃组分/混合催化剂体系组合与至少一种可以相同或不同的第二烯烃单体接触; 和(iv)获得多峰聚烯烃组合物。