Polycyanate copolymers prepared from polyfunctional cyanates and fluorinated monocyanates
申请人:Fraunhofer-Gesellschaft zur
Förderung der angewandten Forschung e.V.
公开号:EP1067149A1
公开(公告)日:2001-01-10
The present invention is directed to polycyanate copolymers, obtainable by copolymerization of at least one polyfunctional cyanate with at least one monocyanate of the formula N≡C-O-R, 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(R')2-CFR"2 wherein each R' is, independently from the other, hydrogen or fluorine or an optically substituted, preferably fluorinated alkyl or alkenyl group, and each of R" may independently be defined as R' or may have an arylic structure. Preferably, the at least one polyfunctional cyanate is selected from aliphatic or aromatic dicyanates or from oligocyanates comprising a straight chain of 2 to 22 oligomerized monocyanates. The polycyanate copolymer may further comprise an aromatic monocyanate and/or one or more of brominated cyanates. The polycyanate copolymers are advantageously used for the preparation of optical systems, e.g. waveguide structures, because they have low optical losses at 1.3 and 1.55µm.
本发明涉及聚氰酸酯共聚物,可通过至少一种多官能团氰酸酯与至少一种式 N≡C-O-R 的单氰酸酯共聚而得,其中 R 是直链或支链非芳香烃基或包含环状结构的非芳香烃基、具有式 C(R')2-CFR "2的基团,其中每个 R'独立地为氢或氟或光学取代的、优选氟化的烷基或烯基,每个 R "可独立地定义为 R'或具有丙烯酸结构。优选地,至少一种多官能团氰酸酯选自脂肪族或芳香族二氰酸酯或由 2 至 22 个低聚单氰酸酯直链组成的低聚氰酸酯。聚氰酸酯共聚物可进一步包含芳香族单氰酸酯和/或一种或多种溴化氰酸酯。由于聚氰酸酯共聚物在 1.3 和 1.55µm 波长处的光学损耗较低,因此可用于制备光学系统,如波导结构。