Partially crystallizing lead-free enamel composition for automobile glass
US5783507A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1997 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Jan 16, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2217/485
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A ceramic enamel composition contains 40-80% by weight of at least one lead-free metal oxide frit containing precursors of Zn.sub.2 SiO.sub.4, such as ZnO and SiO.sub.2, wherein the amount of Zn.sub.2 SiO.sub.4 precursors is less than about 35% by weight of the at least one lead-free metal oxide frit, 0.05-15% by weight of a zinc silicate seed material, and 19-37% by weight of a pigment. The zinc silicate seed material preferably contains crystalline Zn.sub.2 SiO.sub.4. The enamel preferably also contains a bismuth silicate seed material. The ceramic enamel can be employed as a coating around the periphery of automotive glass and is effective in improving appearance and reducing degradation of underlying adhesives by ultraviolet radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.