Foundry moulding composition
US4980394A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1989 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Jan 11, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/2253
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to foundry moulding compositions useful for producing moulds for the manufacture of metal castings wherein the moulds are capable of giving castings with good surface finish without the need for conventional separate blacking applications. A foundry moulding composition of the invention comprises refractory material such as sand, alkali phenol-formaldehyde resole resin solution, carbonifiable material such as styrenated phenol, and an effective amount of an organic ester for hardening the composition. In another embodiment, the invention is a binder composition comprising alkali phenol-formaldehyde resole resin solution and carbonifiable material capable of being hardened by reaction with organic ester. In another embodiment, the invention is a curing additive for a foundry binder comprising carbonifiable material and liquid ester such as gamma-butyrolactone, and the like. In another embodiment, the invention is a method of making a foundry mould wherein a mixture of sand, resin and carbonifiable material is shaped, and then hardened with a gaseous ester such as methyl formate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.