Patent ID: 7285231
Filing Date: 2007-10-23
Classification: G02B

Abstract:
1. An immersion liquid for water-immersion microscopy, having a refractive index of water, when measured at a temperature of 23° C. and a light wavelength of 546.1 nm, having a kinematic viscosity of greater than 20 mm 2 /s measured at a temperature of 20° C., and having a transmission of more than 70% at a layer thickness of 10 mm at wavelengths in the range between 350 nm and 850 nm, and said immersion liquid comprising a mixture of at least two different functional perfluoropolyethers, at least one of said two different functional perfluoropolyethers being selected from the group consisting of and wherein n is in each case in the range from 1 to 3, and p and q are in each case in the range from 3 to 12.