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United States of America Patent
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Dec 16, 2008
Grant Date -
Apr 6, 2006
app pub date -
Dec 19, 2003
filing date -
Dec 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There are disclosed star shaped thermoplastic elastomers made of acrylic block copolymers obtained by transition metal catalysed radical polymerisation. The elastomers comprise core arms obtained from monomers or mixture of monomers, whose T.sub.g is from about -65.degree. C. to about -20.degree. C., and of shell arms obtained from monomers or mixture of monomers, whose T.sub.g is from about 70.degree. C. to about 160.degree. C. The core copolymer has a polydispersity of 2 or higher and the final copolymer has a polydispersity of from 3 to 10.
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