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
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.
대표청구항▼
The invention claimed is: 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, an
The invention claimed is: 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.
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