Alkali metal silicate binder compositions
US4391642A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1980 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | Oct 27, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B28/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A binder composition in aqueous solution, suitable for use in the production of foundry sand moulds and cores is obtained by mixing PA0 (i) an alkali silicate PA0 (ii) a substantially water soluble carbohydrate selected from monosaccharides, disaccharides, polysaccharides and derivatives thereof and PA0 (iii) a phenolic compound selected from monohydric phenols, dihydric phenols, trihydric phenols, phenols of polynuclear hydrocarbons and phenolic acids, which is miscible with or soluble in an aqueous solution of an alkali metal silicate. The composition may also contain an oxyanion such as a borate which is capable of forming a water soluble complex with the carbohydrate. A mixture of phenolic compounds, such as a mixture consisting predominantly of isomers of di- and trihydroxy diphenyl obtained in the distillation of crude resorcinol, may be used. The preferred carbohydrate is a stabilized starch hydrolysate whose reducing power has been removed by a process such as hydrogenation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.