Cycloolefin copolymer composition

Details Cycloolefin copolymer composition Cycloolefin copolymer composition

C - Chemistry, Metallurgy

08

F

C08F 287/00 (2006.01) C08F 210/02 (2006.01) C08F 232/08 (2006.01) C08F 279/02 (2006.01) C08L 9/06 (2006.01) C08L 23/02 (2006.01) C08L 23/16 (2006.01) C08L 25/10 (2006.01) C08L 45/00 (2006.01) C08L 53/02 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2166160

Disclosed is a cycloolefin copolymer composition (C) obtained by copolymerizing an .alpha.-olefin of two or more carbon atoms (a) and a specific cycloolefin (b) in the presence of an aromatic ring-containing vinyl hydrocarbon/conjugated diene copolymer or a product of hydrogenation thereof (A) which has an intrinsic viscosity (r)) of 0.5 to 5.0 dl/g; at least one glass transition temperature (measured by DSC) of lower than 15 °C; polymerizable carbon-to-carbon double bonds in an amount of 2 to 150 in terms of iodine value; and a refractive index n D(A) of 1.50 to 1.65. In the composition (C), the component (A) is contained in an amount of 1 to 40 % by weight, and a difference .DELTA.n D between the refractive index n D(A) of the component (A) and a refractive index n D(B) of a cycloolefin copolymer component (B) obtained by copolymerizing the .alpha.-olefin (a) and the cycloolefin (b) in the absence of the component (A) is not more than 0.015. The cycloolefin copolymer composition is excellent in impact resistance, transparency and heat resistance.

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