Water repellent gypsum composition
US4042409A · kind A · utility
41Cited by
8References
11Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 1, 1976 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Apr 1, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/27
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A water repellent gypsum composition comprising a gypsum, and a paraffin emulsion prepared by emulsifying (a) paraffin hydrocarbon having a melting point of 40.degree.-80.degree. C and (b) an oxidized paraffin having an acid value of 10-70 at a ratio of from 97:3 to 50:50 by weight, respectively, in the presence of a water soluble alkali compound. Optionally, a polymer emulsion or solution may be added.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.