Cycloolefin polymer composition

Details Cycloolefin polymer composition Cycloolefin polymer composition

C - Chemistry, Metallurgy

08

L

C08L 45/00 (2006.01) C08L 47/00 (2006.01)

Patent

CA 2328828

Disclosed is a cycloolefin composition comprising: (a) a cycloolefin polymer that is (A-1) a random copolymer of an .alpha.-olefin with a particular cycloolefin, (A-2) a ring-opening polymer of the cycloolefin or (A-3) a hydrogenation product of the ring-opening polymer (A-2), and (b) a cycloolefin polymer that is (B-1) a random copolymer of an .alpha.-olefin with a particular cycloolefin, (B-2) a ring-opening polymer of the cycloolefin or (B-3) a hydrogenation product of the ring-opening polymer (B-2). The cycloolefin polymer (A) has a glass transition temperature (Tg) lower than 15°C and the cycloolefin polymer (B) a Tg of at least 70°C. A difference of refractive indices of the polymers (A) and (B) is no more than 0.015. The particular cycloolefin for the polymer (A) is for example 5-phenylbicyclo[2.2.1]hept-2-ene or bicyclo[2.2.1]hept-2-ene. The particular cycloolefin for the polymer (B) is for example tetracyclo [4.4Ø1 2,5. 1 7,10]-3-undecene or bicyclo[2.2.1]hept-2-ene.

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