Hydrogenated vinyl aromatic hydrocarbon polymer composition and optical disc substrate
AssigneeMitsubishi Kasei Corporation
InventorsEiji Tanaka, Satoshi Kato, Kaoru Sato
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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.
Claims10
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 from 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.
Dependencies are inferred from the claim text.