Alkali metal silicate binder compositions
US4194918A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1977 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Nov 11, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/54
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to alkali metal silicate binder compositions, particularly for use in the production of foundry moulds and cores. The binders of the invention are in aqueous solution and are obtained by mixing: PA1 (i) an alkali metal silicate, PA1 (ii) a substantially water soluble carbohydrate selected from glycans; glycan oligosaccharides; glycanitols; glycanitol derivatives of oligosaccharides; and monosaccharides and disaccharides and derivatives thereof, and PA1 (iii) an oxyanion of boron, tin, germanium, tellurium or arsenic, which can form with the carbohydrate a water soluble complex. The binders of the invention give better breakdown properties and improved surface finish of metal castings produced using moulds and cores formed using the binders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.