Propylene polymers and products thereof
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United States of America Patent
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Jan 7, 2003
Grant Date -
N/A
app pub date -
Jun 27, 2000
filing date -
Nov 7, 1997
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Abstract
The present invention concerns nucleated propylene polymers having a xylene soluble fraction at 23.degree. C. of less than 2.5%, a crystallization temperature of over 124 .degree. C. and a tensile modulus of greater than 2,000 MPa. These polymers can be prepared by nucleating a propylene polymer with a polymeric nucleating agent containing vinyl compound units, and by polymerizing propylene optionally with comonomers in the presence of a Ziegler-Natta catalyst system primarily transesterified with a phthalic acid ester--a lower alcohol pair to provide said propylene polymer. The catalyst contains a strongly coordinating external donor.
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