UV-blocking filter comprising a layer of temperature stable silver-containing diffusion paint on a borosilicate glass body
First Claim
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1. A UV-blocking filter consisting ofa disk-shaped glass body, anda silver-containing diffusion paint layer coated on and adhering to said glass body;
- wherein said glass body consists of a borosilicate float glass and the silver-containing diffusion paint layer comprises 44.0 percent by weight of copper-II-sulfate-5-hydrate and 25.0 percent by weight Ag2O, Fe and Ba;
whereby the filter is substantially light impermeable in a wavelength range of 400 to 460 nm, but transmits a major portion of incident light and infrared radiation having wavelengths greater than about 600 nm.
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Abstract
The UV-blocking filter is a disk-shaped glass body made of borosilicate float glass, which has a layer of silver-containing diffusion paint adhering to it, which blocks ultraviolet light, so that the UV-blocking filter resists a high thermal load up to temperature of about 500° C. The preferred borosilicate float glass has a composition, in percent by weight, of SiO2, 81; B2O3, 13; Σ Na2O+K2O, 4; and Al2O3, 2. The preferred diffusion paint is a red-brown mordant, which contains 44.0 percent by weight of copper-II-sulfate-5-hydrate, 25.0 percent by weight Ag2O, Fe, and Ba.
4 Citations
7 Claims
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1. A UV-blocking filter consisting of
a disk-shaped glass body, and a silver-containing diffusion paint layer coated on and adhering to said glass body; -
wherein said glass body consists of a borosilicate float glass and the silver-containing diffusion paint layer comprises 44.0 percent by weight of copper-II-sulfate-5-hydrate and 25.0 percent by weight Ag2O, Fe and Ba; whereby the filter is substantially light impermeable in a wavelength range of 400 to 460 nm, but transmits a major portion of incident light and infrared radiation having wavelengths greater than about 600 nm. - View Dependent Claims (2, 3, 4)
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5. A UV-blocking filter consisting of
a disk-shaped glass body, and a silver-containing diffusion paint layer coated on and adhering to said disk-shaped glass body, whose effective coloring ingredients penetrate adjacent regions of the glass body, on which the diffusion paint layer adheres, after the diffusion paint is burned-in in a baking oven at temperatures of 580 to 620° - C. for a sufficiently long time interval;
wherein said glass body consists of a borosilicate float glass and said borosilicate float glass contains 81 percent by weight of SiO2, 13 percent by weight of B2O3, 4 percent by weight of a sum of Na2O and K2O, and 2 percent by weight of Al2O3, and wherein the silver-containing diffusion paint layer comprises 44.0 percent by weight of copper-II-sulfate-5-hydrate and 25.0 percent by weight Ag2O, Fe and Ba; whereby the filter is substantially light impermeable in a wavelength range of 400 to 460 nm, but transmits a major portion of incident light and infrared radiation having wavelengths greater than about 600 nm. - View Dependent Claims (6, 7)
- C. for a sufficiently long time interval;
Specification