IMMERSION LIQUID Russian patent published in 2014 - IPC C09K3/00 G02B1/04 

FIELD: chemistry.

SUBSTANCE: invention relates to an immersion liquid which can be used in optical instrument-making for investigating optical parameters of inorganic materials and optical components, including large, irregularly shaped articles. The immersion liquid for optical investigation contains 97-99 wt % meta-bis(meta-phenoxyphenoxy)benzene and 1-3 wt % 2-naphthol. To reduce viscosity and surface tension, the immersion liquid may further contain 0.1-3 wt % dibutyl sebacate per 100 wt % of said composition.

EFFECT: disclosed immersion liquid is nontoxic, has a good refraction index n_D>1,6 and high adhesion to inorganic optical materials, which enables to deposit on the entire surface of the investigated substrate or part thereof a thin immersion layer and use thereof for effective quality control of large optical articles without immersion in a cell with an immersion liquid.

2 cl, 2 dwg, 2 tbl, 2 ex