Water dispersible moulds
US5573055A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1993 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Jun 15, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/185
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A water dispersible mould for making a casting, the mould comprising a water-insoluble particulate material-and a binder therefor, the binder including polyphosphate chains and/or borate ions. The invention also provides a process for making a water dispersible mould for making a casting, the process including the steps of: (a) providing a water-insoluble particulate material; (b) combining the particulate material with a binder including polyphosphate chains and/or borate ions, the chains and/or ions being dissolved in water; (c) forming, either during or after step (b), the particulate material and binder mixture into a desired shape; and (d) removing free water from the mixture. The polyphosphate chains may be derived from a water soluble phosphate glass and the borate ions may be derived from a soluble borate glass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.