Process for producing crystalline vinyl aromatic polymers having mainly a syndiotactic structure
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United States of America Patent
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Aug 25, 1992
Grant Date -
N/A
app pub date -
Dec 15, 1987
filing date -
Dec 15, 1986
priority date (Note) -
Expired
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Abstract
A process for the production of primarily syndiotactic vinyl aromatic polymers by polymerizing or copolymerizing vinyl aromatic monomers such as styrene or styrene derivatives in the presence of a catalyst system comprising the product of the reaction between: a) a compound of a transition metal (M) different from titanium and containing at least a bond M-O, M-C, M-N, M-P, M-S or M-halogen, and b) an organoaluminum compound containing at least an oxygen atom bound to the aluminum atom or bound between two aluminum atoms. Compound a) can be used as such or may be supported on a suitable carrier.
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