Process for preparing mold
US4269256A · kind A · utility
11Cited by
13References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1979 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | Sep 17, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/162
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A mold with an increased compression strength and a good collapsibility is prepared with a good efficiency by mixing refractory particles with a binder material comprising a caustic alkali-neutralized product of a copolymer containing a carboxyl group and calcium hydroxide, thereby preparing molding materials, filling the molding materials around a pattern, and blowing CO.sub.2 gas into the mold sand, thereby hardening the molding materials. Polyvinyl alcohol, calcium oxide, at least one hydroxide of zinc, aluminum, barium, magnesium, and iron, SBR latex, etc. can be added to the binder material, when desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.