| 摘要 |
Multi-layer film products comprising an inner or core layer (24) made from polyolefin polymers produced by polymerizing an alpha -olefin in the presence of a catalyst including: a pro-catalyst having a magnesium halide; an aluminum halide; a tetravalent titanium halide; an electron donor; and a silane having the formula R1R2Si(OR3)(OR4), wherein R1 and R2 are each an H, C1-6alkyl, aryl, C5-12cycloalkyl, each of which may be unsubstituted, mono- or di-substituted, and R3 and R4 are H, C1-6alkyl, or a mono- or di-substituted C1-6alkyl; and a co-catalyst comprising an organometallic compound, or reaction products of the pro-catalyst and the co-catalyst. The film products have excellent clarity, superior dart impact, resistance to tear and favorable sealability characteristics.
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