Curing foundry moulds and cores
US4678020A · kind A · utility
3Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1985 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Dec 16, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/222
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Foundry moulds and, more especially, cores are made by the use of a binder comprising ammonium polyacrylate and zinc oxide or a metal salt to form a complex ammonium metal polyacrylate which is mixed with the sand and after the core or mould has been formed in a warm box warm air is passed through it to drive off the ammonia and form a water-insoluble metal polyacrylate which bonds the grains of sand together. The resulting core or mould has a good shelf life combined with excellent knock-out behavior.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.