Coating composition having anti-reflective, and anti-fogging properties
AssigneeMinnesota Mining and Manufacturing Company
InventorsMatthew T. Scholz, George V. Tiers
Life of this patent
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Abstract
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 silane or a siloxane oligomer. The coating compositions are particularly useful in the manufacture of disposable surgical masks and face shields.
Claims37
A coating composition which imparts anti-reflection and anti-fogging properties to a substrate having a surface coated therewith, the coating composition comprising:
- (a) inorganic metal oxide particles;
- and
- (b) a silane, or a siloxane oligomer which is formed by the partial or complete hydrolysis and condensation of said silane, wherein said silane or siloxane oligomer comprises at least one hydrophilic anionic group 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.-, --P(O)(O.sup.-).sub.2, --OP(O)(O.sup.-).sub.2, --P(O.sup.-).sub.2 and --OP(O.sup.-).sub.2 ;
- and wherein the coating composition when coated on at least one side of a light transmissive substrate and dried:
- 1) exhibits a drop diameter of at least about 4 mm when tested in accordance with the Wetting Test;
- and
- 2) provides said substrate with a percent transmission at 550 nm which is at least 3 percent greater than that of the uncoated substrate.
An eye shield comprising a substrate which is transparent or translucent to visible light coated with
- (a) a porous inorganic metal oxide network of uniform average thickness which provides anti-reflection properties to the substrate;
- and
- (b) a silane, or a siloxane oligomer which is formed by the partial or complete hydrolysis and condensation of said silane, wherein said silane or siloxane oligomer comprises at least one hydrophilic anionic group 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.-, --P(O)(O.sup.-).sub.2, --OP(O)(O.sup.-).sub.2, --P(O.sup.-).sub.2 and --OP(O.sup.-).sub.2 ;
- which coated substrate exhibits
- 1) a drop diameter of at least 4 mm when tested in accordance with the Wetting Test described herein;
- and
- 2) a percent transmission at 550 nm which is at least 3 percent greater than that of the uncoated substrate.
Dependencies are inferred from the claim text.