Title:
OPTICAL MATERIAL COMPRISING STAR-SHAPED HYDROGENATED POLYSTYRENE BLOCK COPOLYMER, PROCESS FOR PRODUCING THE SAME, AND SUBSTRATE FOR OPTICAL DISK
Document Type and Number:
WIPO Patent Application WO/2001/023437
Kind Code:
A1
Abstract:
An optical material comprising a hydrogenated styrene/conjugated diene block copolymer. The styrene/conjugated diene block copolymer has a star-shaped structure comprising a core and branches linearly extending therefrom, and the branches each comprises styrene units and conjugated diene units. The amount of the styrene units and that of the conjugated diene units are 70 to 99 wt.% and 30 to 1 wt.%, respectively, based on the sum of both. In the hydrogenated polymer, at least 90 mol% of all double bonds contained in the styrene units and conjugated diene units have been hydrogenated. The core is derived from an alkoxysilane or an aromatic hydrocarbon having at least two substituents each having a vinyl group. The optical material is excellent in transparency and heat resistance. The material further has higher melt flowability and better moldability than the corresponding hydrogenated polymer having a linear structure, while retaining intact mechanical properties.
Inventors:
NITTA HIDEAKI (JP)
YAMAURA MICHIO (JP)
TAKEUCHI MASAKI (JP)
HASHIDZUME KIYONARI (JP)
KOHNO KAZUTERU (JP)
IWATA KAORU (JP)
KIDO NOBUAKI (JP)
MATSUMURA SHUNICHI (JP)
YAMAURA MICHIO (JP)
TAKEUCHI MASAKI (JP)
HASHIDZUME KIYONARI (JP)
KOHNO KAZUTERU (JP)
IWATA KAORU (JP)
KIDO NOBUAKI (JP)
MATSUMURA SHUNICHI (JP)
Application Number:
PCT/JP2000/006661
Publication Date:
April 05, 2001
Filing Date:
September 27, 2000
Export Citation:
Assignee:
TEIJIN LTD (JP)
BAYER AG (DE)
NITTA HIDEAKI (JP)
YAMAURA MICHIO (JP)
TAKEUCHI MASAKI (JP)
HASHIDZUME KIYONARI (JP)
KOHNO KAZUTERU (JP)
IWATA KAORU (JP)
KIDO NOBUAKI (JP)
MATSUMURA SHUNICHI (JP)
BAYER AG (DE)
NITTA HIDEAKI (JP)
YAMAURA MICHIO (JP)
TAKEUCHI MASAKI (JP)
HASHIDZUME KIYONARI (JP)
KOHNO KAZUTERU (JP)
IWATA KAORU (JP)
KIDO NOBUAKI (JP)
MATSUMURA SHUNICHI (JP)
International Classes:
C08F8/04; C08F297/04; C08L53/02; G11B7/2533; G11B7/26; (IPC1-7): C08F8/04; C08F297/06; G11B7/24
Domestic Patent References:
| WO1996034896A1 | 1996-11-07 |
Foreign References:
| EP0541180A2 | 1993-05-12 | |||
| JPH01294721A | 1989-11-28 |
Attorney, Agent or Firm:
Ohshima, Masataka (Fukuya Building 3, Yotsuya 4-chom, Shinjuku-ku Tokyo, JP)
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