Dew resistant coatings

• US 7,504,156 B2
• Filed: 04/14/2005
• Issued: 03/17/2009
• Est. Priority Date: 04/15/2004
• Status: Active Grant

• Current Assignee: Avery Dennison Corporation
• Original Assignee: Avery Dennison Corporation
• Inventors: Li, Kai, Iyer, Pradeep S., Chu, Chia-Hsi, Hong, Le Hoa, Dinescu, Liviu
• Primary Examiner(s): Moore; Margaret G
• Application Number:
  US11/105,762
• Publication Number:
  US 20050233135A1
• Time in Patent Office: 1,433 Days
• Field of Search: 428/447, 106/287.14, 106/287.16
• US Class Current: 428/447
• CPC Class Codes: C03C 17/007 containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• CPC Class Codes: C03C 17/42 at least one coating of an organic material and at least one non-metal coating
• CPC Class Codes: C03C 2217/477 Titanium oxide
• CPC Class Codes: C03C 2217/478 Silica
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2217/75 Hydrophilic and oleophilic coatings
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 2483/06 containing silicon bound to oxygen-containing groups C08J2483/12 takes precedence
• CPC Class Codes: C08J 7/0423 with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder
• CPC Class Codes: C08J 7/054 Forming anti-misting or drip-proofing coatings
• CPC Class Codes: C08J 7/056 Forming hydrophilic coatings
• CPC Class Codes: C08J 7/06 with compositions not containing macromolecular substances
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 7/10 Silicon-containing compounds
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09D 183/06 containing silicon bound to oxygen-containing groups C09D183/12 takes precedence
• CPC Class Codes: C09D 5/004 Reflecting paints; Signal paints
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: C09D 7/70 : characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: Y10T 428/259 : Silicic material
• CPC Class Codes: Y10T 428/268 : Monolayer with structurally defined element
• CPC Class Codes: Y10T 428/31612 : As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 : As siloxane, silicone or silane

Abstract

The present invention relates to dew resistant coatings and articles having the dew resistant coating adhered thereto. The dew resistant coatings comprise elongate silica particles. These coating are useful on articles or surfaces used in outdoor applications and articles and surfaces used in moist indoor environments.

Claims

1. A retroreflective article comprising a substrate having a retroreflective surface thereon, and a coating overlying the retroreflective surface, the coating comprising (a) at least about 75% by weight of elongate silica particles having an aspect ratio greater than 1, and (b) an organic binder comprising at least one hydrolysis product or at least one partial condensate of an epoxy functional silane, wherein the coating comprises about 15 to 25% by weight of an organic binder.

2. The article of claim 1 wherein the silane is selected from glycidoxy methyltrimethoxysilane, 3-glycidoxypropyltrihydroxysilane, 3-glycidoxypropyl-dimethylhydroxysilane, 3-glycidoxypropyltrimeth-oxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyl-dimethoxymethylsilane, 3-glycidoxypropyldimethylmethoxysilane, 3-glycidoxypropyltributoxysilane, 1,3-bis(glycidoxypropyl)tetramethyldisiloxane, 1,3-bis(glycidoxypropyl)tetramethoxydisiloxane, 1,3-bis(glycidoxypropyl)-1,3-dimethyl-1,3-dimethoxydisiloxane, 2,3-epoxypropyl-trimethoxysilane, 3,4-epoxybutyltrimethoxysilane, 6,7-epoxyheptyl-trimethoxysilane, 9,10-epoxydecyltrimethoxysilane, 1,3-bis(2,3-epoxypropyl) tetramethoxydisiloxane, 1,3-bis(6,7-epoxyheptyl)tetramethoxydisiloxane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and combinations of two or more thereof.

3. The article of claim 1 wherein the coating further comprises an organosilane compound not having epoxy functionality.

4. A retroreflective article comprising a substrate having a retroreflective surface thereon, and a coating overlying the retroreflective surface, the coating comprising (a) at least about 75% by weight of elongate silica particles having an aspect ratio greater than 1, and (b) an organic binder comprising at least one hydrolysis product or at least one partial condensate of silane compound, wherein the silane compound comprises cyclohexyltrimethoxysilane.

5. A retroreflective article comprising a substrate having a retroreflective surface thereon, and a coating overlying the retroreflective surface, the coating comprising (a) at least about 75% by weight of elongate silica particles having an aspect ratio greater than 1, and (b) an organic binder comprising at least one hydrolysis product or at least one partial condensate of an epoxy functional silane, wherein the coating further comprises spherical silica particles having an average diameter of less than 50 nanometers.

6. A retroreflective article comprising a substrate having a retroreflective surface thereon, and a coating overlying the retroreflective surface, the coating comprising (a) at least about 75% by weight of elongate silica particles having an aspect ratio greater than 1, and (b) an organic binder comprising at least one hydrolysis product or at least one partial condensate of an epoxy functional silane, wherein the coating further comprises titanium dioxide nanoparticles.

7. A retroreflective article comprising a substrate having a retroreflective surface thereon, and a coating overlying the retroreflective surface, the coating comprising (a) at least about 75% by weight of elongate silica particles having an aspect ratio greater than 1, and (b) an organic binder comprising at least one hydrolysis product or at least one partial condensate of an epoxy functional silane, wherein the silica particles comprise chain silica particles.