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Coating composition having anti-reflective and anti-fogging properties

  • US 5,753,373 A
  • Filed: 12/21/1995
  • Issued: 05/19/1998
  • Est. Priority Date: 12/21/1995
  • Status: Expired due to Term
First Claim
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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.

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