Patent ID: 6716958
Filing Date: 2004-04-06
Classification: C08G,G02B

Abstract:
An optical waveguide system or a structure or part thereof, comprising a resin composed of at least one polycyanate copolymer, obtainable by copolymerization of at least one difunctional cyanate of formula II: wherein R1 to R4 and R5 to R8 are independently from each other hydrogen, optionally substituted C1-C10 alkyl, C3-C8-cycloalkyl, C1-C10-alkoxy, halogen, phenyl or phenoxy, the alkyl or aryl groups being unfluorinated, partly fluorinated or fully fluorinated, Z is a chemical bond, SO2, CF2CH2, CHF, CH(CH3), isopropylene, hexafluoroisopropylene, n- or iso-C1-C10 alkylene, O, NR9, N&boxH;N, CH&boxH;CH, C(O)O, CH&boxH;N, CH&boxH;Nâ€”N&boxH;CH, alkyl oxyalkylene having 1 to 8 carbon atoms, S, Si(CH3)2, and R9 is hydrogen or C1-C10 alkyl with at least one monocyanate of the following formula I:Nâ‰¡Câ€”Oâ€”Râ€ƒâ€ƒ(I) wherein R is a straight or branched non-aromatic hydrocarbon radical or a non-aromatic hydrocarbon radical comprising a cyclic structure, the radical having the formula C(Râ€²)2-CFRâ€³2 wherein each Râ€² is, independently from the other, hydrogen or fluorine or an optionally substituted alkyl or alkenyl group, and each of Râ€³ may independently be defined as Râ€² or may have an arylic structure.