PURPOSE: To obtain a low reflectance glass superior in durability and weather resistance, by forming a coated film of a mixture of a silane compd. contg. a polyfluoroalkyl group, and metal hexafluorosilicate on the surface of a glass.
CONSTITUTION: The present low reflectance glass is obtained by mixing a solvent soln. of a compd. or a condensate of a partial hydrolyzate of the compd. represented by formula I (Rf is 1W20C polyfluoroalkyl optionally having ether bond; Q is a divalent org. group; X is a lower alkyl group; Y1 is halogen, alkoxy, or the like; (a) is 1, 2, or 3; and (b) is 0, 1, or 2), such as CnF2n+1CH2CH2 SiCl3 [(n) is a mixture of 6, 8, 10, 12, and 9 in average], and an aq. soln. of a compd. having formula II (M is a metal group; Y2 is H, ClR'COO-; (d) is 1W4; (e) is 0, 1 or 2; (f) is 1 when C is 1, and it is 1 or 3 when C is 2), such as Li2SiF6; stirring the mixture; dipping the glass base into this soln. of the mixture, and curing this coated film at 100% humidity and 160°C temp. for 1hr.
MATSUO HITOSHI
YAMAGISHI NOBUYUKI
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