CATALYST SYSTEM BASED ON A RARE-EARTH METALLOCENE AND A CO-CATALYST HAVING A PLURALITY OF CARBON-MAGNESIUM BONDS
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United States of America Patent
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Apr 11, 2024
app pub date -
Nov 19, 2021
filing date -
Nov 24, 2020
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Abstract
A catalytic system based on at least one rare-earth metallocene and an organomagnesium reagent as co-catalyst of formula RB—(Mg—RA)m—Mg—RB is provided. According to the formula, RB comprises a benzene nucleus substituted with the magnesium atom. One of the carbon atoms of the benzene nucleus ortho to the magnesium is substituted with a methyl, an ethyl or an isopropyl or forms a ring with the carbon atom which is its closest neighbour and which is meta to the magnesium. The other carbon atom of the benzene nucleus ortho to the magnesium is substituted with a methyl, an ethyl or an isopropyl. RA is a divalent aliphatic hydrocarbon-based chain, optionally interrupted with one or more oxygen or sulfur atoms or with one or more arylene groups. The m is a number greater than or equal to 1, preferably 1. The catalytic system allows the synthesis of dienic and/or ethylenic telechelic polymers.
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