Hydrogenated vinyl aromatic hydrocarbon polymer composition and optical disc substrate
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United States of America Patent
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Jan 12, 1993
Grant Date -
N/A
app pub date -
Mar 13, 1992
filing date -
Mar 18, 1991
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Abstract
Disclosed herein are a hydrogenated vinyl aromatic hydrocarbon polymer composition comprising: (a) 5-90% by weight of a hydrogenated vinyl aromatic hydrocarbon-conjugated diene block copolymer obtained by hydrogenating the substantially whole double bonds derived for the conjugated diene bonds and not less than 60 mol % and less than 80 mol % of an aromatic-ring, the content of the conjugated diene polymer segments in said block copolymer being 1-50 wt %; and (b) 10-95% by weight of a hydrogenated vinyl aromatic hydrocarbon polymer obtained by hydrogenating not less than 60 mol % and less than 80 mol % of an aromatic-ring, and an optical disc substrate molded therefrom.
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