Additives for lead-free frits
US5149565A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Oct 31, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C8/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention is drawn to a method for eliminating the grayish discoloration which customarily develops when lead-free and cadmium-free glass frits are applied to substrates employing an organic vehicle and which are thereafter fired to fuse the frit particles into a glaze. The grayish hue results from a carbonaceous residue left upon thermally decomposing the organic vehicle. The inventive method comprises five general elements: PA0 (a) glass frit particles of a desired composition are prepared; PA0 (b) a coating of an organic compound containing at least one sulfur oxide group as an oxidizing agent is adsorbed on the surface of the particles; PA0 (c) the coated particles are mixed with an organic vehicle; PA0 (d) that mixture is coated onto a surface of a substrate; and PA0 (e) that coated substrate is fired to fuse the frit particles into a glaze, the oxidizing agent eliminating the carbonaceous residue left upon thermal decomposition of the organic vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.