Process for the preparation of crystalline vinylaromatic polymers with a predominately syndiotactic structure
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United States of America Patent
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May 23, 2000
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N/A
app pub date -
Sep 20, 1996
filing date -
Oct 27, 1995
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Expired
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Abstract
Process for the preparation of crystalline vinylaromatic polymers with a predominantly syndiotactic structure which comprises polymerizing the vinylaromatic monomers, alone or mixed with at least another copolymerizable ethylenically unsaturated monomer, in the presence of a catalytic system essentially consisting of: a) an adduct between a derivative of titanium having the formula R.sub.1 R.sub.2 R.sub.3 R.sub.4 Ti and a calix-[n]-arene, or an oxa-calix-[n]-arene; b) a co-catalyst selected from an alkylalumoxane and a compound of boron having the formula (II): BX.sub.1 X.sub.2 X.sub.3 or its salt.
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