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A coating composition which imparts anti-reflective and anti-fog properties to substrates coated therewith. The coating composition utilizes an inorganic metal oxide in combination with particular anionic surfactants. The coating compositions are particularly useful in the manufacture of disposable

A coating composition which imparts anti-reflective and anti-fog properties to substrates coated therewith. The coating composition utilizes an inorganic metal oxide in combination with particular anionic surfactants. The coating compositions are particularly useful in the manufacture of disposable surgical masks and face shields.

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[ We claim:] [1.] A coating composition which imparts anti-reflection and anti-fogging properties to a substrate having at least one surface coated therewith, the coating composition comprising:(a) an inorganic metal oxide sol capable of forming a porous inorganic metal oxide network which provides

[ We claim:] [1.] A coating composition which imparts anti-reflection and anti-fogging properties to a substrate having at least one surface coated therewith, the coating composition comprising:(a) an inorganic metal oxide sol capable of forming a porous inorganic metal oxide network which provides anti-reflective properties to a substrate; and(b) a surfactant having a solubility in water of less than about 1 percent by weight at 23.degree. C. and comprised of at least one hydrophobic group and at least one hydrophilic anionic group, wherein:(i) the hydrophilic anionic group comprises an anion selected from the group consisting of --OSO.sub.2 O.sup.-, --SO.sub.2 O.sup.+, --CO.sub.2.sup.-, (--O).sub.2 P(O)O.sup.-, --OP(O)(O.sup.-).sub.2, --P(O)(O.sup.-).sub.2, --P(O.sup.-).sub.2, --OP(O.sup.-).sub.2, (--SO.sub.2).sub.2 N.sup.-, --SO.sub.2 N(R).sup.-, (--SO.sub.2).sub.2 C.sup.- H, and --N.sup.+ (R).sub.2 (CH.sub.2).sub.x L', wherein R is hydrogen, an alkyl group which is unsubstituted or substituted with atoms independently selected from the group consisting of oxygen, nitrogen and sulfur, or an alkylene carboxyl group, which alkyl or alkylene carboxyl group comprises about 1 to 10 carbon atoms; x is 1 to 4; and L' is selected from the group consisting of --OSO.sub.2 O.sup.-, --SO.sub.2 O.sup.-, (--O).sub.2 P(O)O.sup.-, --OP(O)(O.sup.-).sub.2, --P(O)(O.sup.-).sub.2 and --CO.sup.-2 ; and wherein each anionic group is associated with or covalently bound to at least one cation, which cation is selected from the group consisting of H.sup.+, Na.sup.+, K.sup.+, Li.sup.+, Ca.sup.+2, Mg.sup.+2, Sr.sup.+2, Al.sup.+3, and R"A.sup.+, wherein R" is R or R' wherein R is hydrogen or an alkyl or cycloalkyl group of about 1 to 10 carbon atoms, and R' is covalently bonded to the surfactant molecule and is an alkyl bridging group of 1 to 10 carbon atoms, and A.sup.+ is N.sup.+ R.sub.3, a guanidinium ion optionally substituted with oxygen, nitrogen or sulfur atoms, or N.sup.+ B wherein B comprises 3 to 7 atoms selected from the group consisting of carbon, nitrogen, sulfur and oxygen atoms which complete the nitrogen containing heterocyclic ring; and wherein any R or R' group may be unsubstituted or substituted with atoms independently selected from the group consisting of oxygen, nitrogen or sulfur; the cation selected such that the net charge of the surfactant molecule is neutral; and(ii) wherein the hydrophobic group comprises a hydrocarbon chain comprising at least 4 carbon atoms, or a perfluorinated radical comprising at least 3 carbon atoms; rein the coating composition when coated on at least one side of a light transmissive substrate and dried provides a coated substrate with:(1) a porous inorganic metal oxide network of uniform average thickness;(2) a drop diameter of at least about 4 mm when tested in accordance with the Wetting Test described herein; and(3) a percent transmission at 550 nm which is at least 3 percent greater than that of the uncoated substrate.