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发明授权
US07381780B2 Catalyst compositions comprising small silica support materials and methods of use in polymerization reactions 有权
包含小二氧化硅载体材料的催化剂组合物和在聚合反应中使用的方法

Catalyst compositions comprising small silica support materials and methods of use in polymerization reactions
摘要：
Improved catalyst compositions, and polymerization processes using such improved catalyst compositions, are provided. An example of an improved catalyst composition is a supported catalyst system that includes at least one titanium compound, at least one magnesium compound, at least one electron donor compound, at least one activator compound, and at least one silica support material, the at least one silica support material having a median particle size in the range of from 20 to 50 microns with no more than 10% of the particles having a size less than 10 microns and no more than 10% of the particles having a size greater than 50 microns and average pore diameter of at least ≧220 angstroms.
摘要（中）：

提供改进的催化剂组合物和使用这种改进的催化剂组合物的聚合方法。 改进的催化剂组合物的实例是载体催化剂体系，其包括至少一种钛化合物，至少一种镁化合物，至少一种电子给体化合物，至少一种活化剂化合物和至少一种二氧化硅载体材料，至少 一种二氧化硅载体材料，其中值粒度在20至50微米的范围内，不超过10％的具有小于10微米尺寸的颗粒和不超过10％的尺寸大于50微米的颗粒 平均孔径至少≥220埃。

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