Patent ID: 6391141
Filing Date: 2002-05-21
Classification: C03C,Y10T

Abstract:
A process for adhering a layer of organic paint to a surface of an automotive glass sheet, the process comprising the steps of:A) applying, to at least a portion of said surface of a glass sheet a layer of water-based paint, the composition of said water-based paint, comprising: (i) water-soluble sodium silicate forming 20 to 45 weight percent of said composition, (ii) water forming 5 to 25 weight percent of said composition; (iii) water-soluble base in an amount sufficient to provide said composition with a pH of at least 10.5; (iv) finely divided metal oxide powder selected from the group consisting of oxides of copper, iron, nickel, cobalt and mixtures thereof forming 20 to 45 weight percent of said composition and having a particle size, on average, less than 7 microns; (v) particles of soda-lime-silica glass forming 3 to 55 weight percent of said composition and having a diameter, on average, less than 20 microns and having a melting point of at least 1700Â° F.; and at least one material selected from the group consisting of: (vi) low-melting glass frit powder melting below 1300Â° F. forming up to 20 weight percent of said composition and having a particle size, on average, less than 10 microns; (vii) zinc oxide forming up to 10 weight percent of said composition; B) heating said surface of a glass sheet to cure said water-based paint; C) forming said glass sheet coated with said water-based paint into a shape; D) applying a layer of sensitizing material comprising saline over said layer of said water-based paint on said surface of the glass; E) applying a layer of organic paint over said coating of water-based said sensitizing material ; and F) curing said layer of organic paint such that said organic paint is bonded to said surface of a glass sheet.