Cycloolefin copolymer composition

Details Cycloolefin copolymer composition Cycloolefin copolymer composition

1997-04-14

1998-12-29

Mullis, Jeffrey C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525289, 525313, C08L 2316, C08L 2308, C08L 5302, C08L 4500

Patent

active

058543490

ABSTRACT:
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 (.eta.) of 0.5 to 5.0 dl/g; at least one glass transition temperature (measured by DSC) of lower than 15.degree. C.; polymerizable carbon-to-carbon double bonds in an amount of 2 to 150 in terms of iodine value; and a refractive index n.sub.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.sub.D between the refractive index n.sub.D (A) of the component (A) and a refractive index n.sub.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.

REFERENCES:
patent: 4250063 (1981-02-01), Kotani et al.
patent: 4614778 (1986-09-01), Kajiura et al.
patent: 4918133 (1990-04-01), Moriya
patent: 5494969 (1996-02-01), Abe

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