Process for production a thin glasslike coating on substrates for reducing gas permeation
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United States of America Patent
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Issued Date -
Jul 1, 2010
app pub date -
Jul 8, 2006
filing date -
Jul 26, 2005
priority date (Note) -
Abandoned
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Abstract
A method for producing a glassy, transparent coating on a substrate by coating the substrate with a solution containing a) a polysilazane of the formula—where R′, R″, R′″ are identical or different and independently represent hydrogen or an optionally substituted alkyl radical, aryl radical, vinyl radical or (trialkoxysilyl)alkyl radical, n being an integer and or being calculated such that the polysilazane has a number-average molecular weight of from 150 to 150 000 g/mol, and b) a catalyst in an organic solvent, removing the solvent using evaporation such that a polysilazane layer having a layer thickness of 0.05-3.0 μm remains on the substrate, and irradiating the polysilazane layer with VUV radiation having wavelength portions <230 nm and UV radiation having wavelength portions between 230 and 300 nm in an atmosphere containing steam in the presence of oxygen, active oxygen and optional nitrogen.
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