| 摘要 |
A catalyst for use in the production of flexible polyolefins using a pro-catalyst of (a) a magnesium halide, (b) an aluminum halide, (c) a tetravalent titanium halide, (d) an electron donor comprising at least one of 2,6-lutidine, 6-chloro-2-picoline, or 2,6-dichloropyridine; and (e) a silane having the formula R1R2Si(OR3)(OR4), wherein R1 and R2 are each an H, C1-6 alkyl, C1-6 aryl, C5-12 cycloalkane, each of which may be unsubstituted, mono- or di-substituted, and R3 and R4 are H, C1-6 alkane, or a mono- or di-substituted C1-6 alkane, and a co-catalyst of an organometallic compound, as well as an optional external modifier that may be combined to form a catalyst. Methods for preparing the catalyst, for using the same to produce flexible polyolefin compositions having reduced stickiness and tacticity, and the flexible polyolefin compositions produced thereby are also part of the invention. The flexible polyolefin compositions are high-molecular weight average, predominantly atactic flexible polyolefin polymers having a heat of fusion of about 15 J/g to 60 J/g, a polydispersity of less than about 10, a melt flow rate of between about 0.3 g/10 min. to 15 g/10 min., and a reduced stickiness.
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