Shear degradation inhibitor for triblock thermoplastic elastomers
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United States of America Patent
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Issued Date -
Jun 17, 2004
app pub date -
Dec 11, 2002
filing date -
Dec 11, 2002
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Abandoned
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Abstract
Thermoplastic elastomers, such as styrene-poly(ethylene-propylene)-styrene (SEPS) and styrene-poly(ethylene-butylene)-styrene (SEBS), have a tendency to undergo homolytic cleavage on mixing, particularly when extended mixing times are employed. Such thermoplastic elastomers are protected by addition of a polymer with multiple reactive sites, such as polybutadiene. The polymer reacts with two or more of the cleaved fragments forming a copolymer which regains much of the original character of the thermoplastic elastomer.
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