Block copolymers and composition containing the same
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United States of America Patent
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Jan 22, 1991
Grant Date -
N/A
app pub date -
Sep 22, 1989
filing date -
Oct 7, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A block copolymer having a numerical average molecular weight of 30,000 to 300,000 composed of two or more blocks consisting of aromatic vinyl units having a numerical average molecular weight of 2500 to 40,000, and one or more blocks containing a vinyl bonding content of not less than 40%, having a peak temperature of primary dispersion of tan .delta. at least 0.degree. C., and consisting of isoprene or isoprene-butadiene units in which at least a part of carbon-carbon double bonds may be hydrogenated, and a composition consisting of the block copolymer. The composition can provide a vibration-damping material.
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