C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 5/18 (2006.01) B29C 41/24 (2006.01) C08F 32/08 (2006.01) C08G 61/08 (2006.01)
Patent
CA 2106086
There is provided a thermoplastic saturated norbornene resin which has desirable properties as an optical material, which has a small birefringence and which is low in deterioration of optical properties. A sheet having a maximum birefringence of 20 nm or less, made of a thermoplastic norbornene resin having a glass transition temperature of 110°C or more and a residual solvent concentration of 0.5% by weight or less, is obtained by dissolving a thermoplastic saturated norbornene resin in a solvent having a boiling point of 100°C or more, drying the cast solution at a highest temperature of 100°C or less until the residual solvent concentration becomes 10% by weight or less, and then continuing drying at a temperature of 110°C or more until the residual solvent concentration becomes 0.5% by weight or less.
Hani Tsutomu
Kohara Teiji
Natsuume Tadao
Takahashi Nobukazu
Marks & Clerk
Nippon Zeon Co. Ltd.
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