申请人:Polaroid Corporation
公开号:US05262549A1
公开(公告)日:1993-11-16
4-[3-(benz[b]pyran-4-ylidene)prop-1-enyl]benz[b]pyrylium, 4-[5-(4H-benz[b]pyran-4-ylidene)penta-1,3-dienyl]benz[b]pyrylium and 4-[7-(4H-benz[b]pyran-4-ylidene)hepta-1,3,5-trienyl]benz[b]pyrylium dyes, wherein at least one of the benzpyrylium nuclei carries at its 2-position a substituent in which a non-aromatic carbon atom is bonded directly to the benzpyrylium nucleus, subject to the proviso that if the or each 2-substituent contains an aromatic nucleus, this aromatic nucleus is not conjugated with the benzpyrylium nucleus, are useful as visible and near infra-red absorbers, having high extinction coefficients and a reduced tendency to develop absorptions at shorter wavelengths when dispersed in polymeric media.
4-[3-(苯并[b]吡喃-4-基亚甲基)丙-1-烯基]苯并[b]吡喃阳离子,4-[5-(4H-苯并[b]吡喃-4-基亚甲基)戊-1,3-二烯基]苯并[b]吡喃阳离子和4-[7-(4H-苯并[b]吡喃-4-基亚甲基)庚-1,3,5-三烯基]苯并[b]吡喃阳离子染料,其中至少一个苯并吡喃阳离子核在其2位携带一个取代基,其中非芳香碳原子直接连接到苯并吡喃核,但条件是,如果每个2-取代基含有芳香核,这个芳香核不与苯并吡喃核共轭,这些染料可用作可见光和近红外吸收剂,具有高消光系数和在聚合介质中分散时发展吸收在较短波长处的倾向减少。