Patent ID: 6596810
Filing Date: 2003-07-22
Classification: C08L,Y10S

Abstract:
A polymer alloy comprising (a) one or more cycloolefin copolymer â€œ(COC)â€  component(s), and, dispersed in said cycloolefin copolymer component, (b) one or more particulate core/shell components;said cycloolefin copolymer component consisting essentially of at least one cycloolefin copolymer comprising structural units obtained by copolymerization of two or more of the following olefins in the indicated amounts: 0.1-99% by weight, based on the weight of the cycloolefin copolymer, of at least one of the following polycyclic olefins of the formulas I, II, III, IV, V or VI, â€ƒin which R1, R2, R3, R4, R5, R6, R7 and R8 are identical or different and are a hydrogen atom or a C1-C20 hydrocarbon radical, or two or more of the radicals R1 through R8 form a ring, if sterically positioned to be able to form a ring, and the radicals R1 to R8 in the formulae I to VI are identical or different from one another, 0 to 95% by weight, based on the total weight of the cycloolefin copolymer, of at least one monocyclic olefin of the formula VII â€ƒin which n is a number from 2 to 10, and 0 to 99% by weight, based on the total weight of the cycloolefin polymer, of one or more acyclic olefins of the formulae VIII â€ƒin which R9, R10, R11 and R12 are identical or different and are a hydrogen atom or a C1-C20 hydrocarbon radical; and said particular core/shell component consisting essentially of: one or more rubber phase(s) and one or more hard phase(s), the hard phase having a glass transition temperature above 50Â° C. and the rubber phase having a lower glass transition temperature than said hard phase, said rubber and hard phases consisting essentially of polymerized unsaturated compounds having carbonâ€”carbon bonds in the polymer backbone and wherein said particulate core/shell component have an average refractive index, determined as the volume mean, of 1.52 to 1.55.