Means of producing high diblock content thermoplastic elastomers via chain transfer
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Jan 9, 2001
filing date -
Jan 9, 2001
priority date (Note) -
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Abstract
A process of preparing a diblock/triblock composition in a single reaction vessel includes reacting a first monomer, such as styrene, with a first portion of an anionic catalyst in a suitable solvent to form a first polymer block of the triblock. A second step includes adding a second portion of the catalyst and a second monomer, such as butadiene (when the first monomer is styrene). A portion of the resulting living diblock polymer is then terminated by addition of a chain transfer agent, which forms a second anionic catalyst in the process. Further sequential additions of the second and first monomers copolymerize with both the remaining living diblock and with the second anionic catalyst to complete the triblock polymer and form a second portion of diblock polymer.
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