Anti-fog coating

Patent metadata

Field	Value
Publication number	US-9500860-B2
Application number	US-201313893021-A
Country	US
Kind code	B2
Filing date	May 13, 2013
Priority date	May 15, 2012
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

An optical component having an anti-fog coating obtainable by covalent attachment of a silane having the formula (1): R o X m SiA n to the surface of the optical component. The covalent attachment of the compound of the formula (1) to the surface of the optical component is accomplished by reacting at least one of the reactive, hydrolyzable —Si—X— groups with a suitable reactive surface group, for example, an —OH group, to form —Si—O—.

First claim

What is claimed is:

1. An optical component having an anti-fog coating obtainable by covalent attachment of a silane derivative of the formula (1) to the surface of the optical component:
R o X m SiA n   (1)

wherein
m=1 to 3, n=1 or 2 and o=0 or 1, with the proviso that m+n+o=4;
the radical X is selected from halogen or C 1-4 -alkoxy, and for m=2 or 3 the individual radicals X may be identical or different,
the radical R is C 1-4 -alkyl,
the radical A has the structure -A1-A2, in which -A1- is a hydrophobic group bonded to the Si atom, and -A2 represents a terminal hydrophilic group bonded to the hydrophobic group A1,
the hydrophobic group -A1- being selected from -arylene-; —C 1-6 -alkylene-arylene-; -arylene-C 1-6 -alkylene-; —C 1-6 -alkylene-arylene-C 1-6 -alkylene-; -poly(C 3-6 -alkoxylene)-, fluorinated or perfluorinated -alkylene-, fluorinated or perfluorinated -poly(C 2-6 -alkoxylene)-, or a combination of these groups, and
the terminal hydrophilic group -A2 is poly(meth)acrylate, and for n=2 the individual radicals A may be identical or different.

2. The optical component according to claim 1 , where the anti-fog coating has crosslinking between hydrophilic groups -A2 and/or hydrophobic groups -A1- of adjacent molecules.

3. The optical component according to claim 1 , where the covalent attachment of the compound of the formula (1) to the surface of the optical component takes place by reacting at least one of the reactive —Si—X— groups with a suitable reactive surface group to form —Si—O—.

4. The optical component according to claim 1 , where the optical component comprises an anti-reflection coat and the anti-fog coating is applied to the anti-reflection coat.

5. The optical component according to claim 4 , the anti-fog coating having a coat thickness of 100 nm or less.

6. The optical component according to claim 1 , wherein the poly(meth)acrylate of the terminal hydrophilic group -A2 comprises monomer units which are selected from CH 2 ═C(CH 3 )COOC 1-4 -alkyl, CH 2 ═C(H)COOC 1-4 -alkyl, hydroxyethylene methacrylate, 2-acrylamido-2-methylpropanesulphonic acid, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, or mixtures thereof.

Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Gloege Thomas
• Hugenberg Norbert
• Von Blanckenhagen Bernhard
• Kraus Stefan

Classifications

• C03C17/34

  with at least two coatings having different compositions (C03C17/44 takes precedence) · CPC title

• G02B1/18 Primary

  Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films (G02B1/16 takes precedence) · CPC title

• C03C2217/75

  Hydrophilic and oleophilic coatings · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C09D133/14

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title