Coating composition having anti-reflective and anti-fogging properties
First Claim
Patent Images
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) inorganic metal oxide particles; and
(b) a nonionic surfactant comprised of at least one hydrophobic group and at least one hydrophilic group, wherein(1) the hydrophilic group is selected from the group consisting of(i) pyrrolidone, and(ii) a polyhydroxyl group comprising at least two hydroxyl groups, wherein at least two of the hydroxyl groups are separated by no more than 5 atoms, and the number of said hydroxyl groups is greater than or equal to the total number of hydrophobic groups present within the surfactant molecule, and(2) wherein the hydrophobic group is a hydrocarbon chain comprising at least 4 carbon atoms or a perfluorinated radical comprising at least 3 carbon atoms, and wherein the coating composition when coated on at least one side of a light transmissive substrate;
(1) provides a porous inorganic metal oxide network of uniform average thickness;
(2) provides said substrate with a drop diameter of at least 4 mm when tested in accordance with the Wetting Test described herein; and
(3) provides said substrate with a percent transmission at 550 nm which is at least 3 percent greater than that of the uncoated substrate.
1 Assignment
0 Petitions
Accused Products
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 particular polyhydroxy surfactants. The coating compositions are particularly useful in the manufacture of disposable surgical masks and face shields.
-
Citations
33 Claims
-
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) inorganic metal oxide particles; and (b) a nonionic surfactant comprised of at least one hydrophobic group and at least one hydrophilic group, wherein (1) the hydrophilic group is selected from the group consisting of (i) pyrrolidone, and (ii) a polyhydroxyl group comprising at least two hydroxyl groups, wherein at least two of the hydroxyl groups are separated by no more than 5 atoms, and the number of said hydroxyl groups is greater than or equal to the total number of hydrophobic groups present within the surfactant molecule, and (2) wherein the hydrophobic group is a hydrocarbon chain comprising at least 4 carbon atoms or a perfluorinated radical comprising at least 3 carbon atoms, and wherein the coating composition when coated on at least one side of a light transmissive substrate; (1) provides a porous inorganic metal oxide network of uniform average thickness; (2) provides said substrate with a drop diameter of at least 4 mm when tested in accordance with the Wetting Test described herein; and (3) provides said substrate with a percent transmission at 550 nm which is at least 3 percent greater than that of the uncoated substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 26)
-
-
23. 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 nonionic surfactant comprised of at least one hydrophobic group and at least one hydrophilic group, wherein (1) the hydrophilic group is selected from the group consisting of (i) pyrrolidone, and (ii) a polyhydroxyl group comprising at least two hydroxyl groups, wherein at least two of the hydroxyl groups are separated by no more than 5 atoms, and the number of said hydroxyl groups is greater than or equal to the total number of hydrophobic groups present within the surfactant molecule, and (2) wherein the hydrophobic group is a hydrocarbon chain comprising at least 4 carbon atoms or a perfluorinated radical comprising at least 3 carbon atoms;
which coated substrate when coated on at least one surface 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. - View Dependent Claims (24, 25)
- and
-
27. An article 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 nonionic surfactant comprised of at least one hydrophobic group and at least one hydrophilic group, wherein (1) the hydrophilic group is selected from the group consisting of (i) pyrrolidone, and (ii) a polyhydroxyl group comprising at least two hydroxyl groups, wherein at least two of the hydroxyl groups are separated by no more than 5 atoms, and the number of said hydroxyl groups is greater than or equal to the total number of hydrophobic groups present within the surfactant molecule, and (2) wherein the hydrophobic group is a hydrocarbon chain comprising at least 4 carbon atoms or a perfluorinated radical comprising at least 3 carbon atoms;
which coated substrate when coated on at least one surface 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. - View Dependent Claims (28)
- and
-
29. A method of imparting anti-reflection and anti-fogging properties to a substrate, the method comprising the steps of:
-
(a) providing a substrate; (b) preparing a composition comprising; (1) inorganic metal oxide particles; and (2) a nonionic surfactant comprised of at least one hydrophobic group and at least one hydrophilic group, wherein (a) the hydrophilic group is selected from the group consisting of (i) pyrrolidone, and (ii) a polyhydroxyl group comprising at least two hydroxyl groups, wherein at least two of the hydroxyl groups are separated by no more than 5 atoms, and the number of said hydroxyl groups is greater than or equal to the total number of hydrophobic groups present within the surfactant molecule, and (b) wherein the hydrophobic group is a hydrocarbon chain comprising at least 4 carbon atoms or a perfluorinated radical comprising at least 3 carbon atoms; (c) applying the coating composition to at least one side of the substrate; and (d) drying the coating composition to produce a coated substrate having a porous inorganic metal oxide network of uniform average thickness; which coated substrate when coated on at least one surface 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. - View Dependent Claims (30, 31, 32)
-
-
33. A method of imparting anti-reflection and anti-fogging properties to a substrate, the method comprising the steps of:
-
(a) providing a substrate; (b) preparing a first coating composition comprising inorganic metal oxide particles; (c) preparing a second coating composition comprising a nonionic surfactant comprised of at least one hydrophobic group and at least one hydrophilic group, wherein (1) the hydrophilic group is selected from the group consisting of (i) pyrrolidone, and (ii) a polyhydroxyl group comprising at least two hydroxyl groups, wherein at least two of the hydroxyl groups are separated by no more than 5 atoms, and the number of said hydroxyl groups is greater than or equal to the total number of hydrophobic groups present within the surfactant molecule, and (2) wherein the hydrophobic group is a hydrocarbon chain comprising at least 4 carbon atoms or a perfluorinated radical comprising at least 3 carbon atoms; (d) applying either the first or second coating composition to at least one side of the substrate; (e) allowing the coating applied in step (d) to dry; (f) applying the coating composition not applied in step (d) to at least one side of the substrate; (g) allowing the coating applied in step (f) to dry; wherein the substrate is light transmissive and the amount of metal oxide and surfactant applied to the substrate is sufficient to provide the 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.
-
Specification