Poly-vinylphosphonic acid and metal oxide or cermet or glass ionomer cement
US5079277A · kind A · utility
16Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1989 |
| Grant date | Jan 7, 1992 |
| Priority date | — |
| Expiry date | Apr 27, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/00836
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A glass ionomer cement composition comprises poly(vinyl phosphonic acid) dissolved in its own mass of water; and (in treble the total mass of the solution) a powder, being glass or MgO or a cermet. The powder has to be deactivated so that the setting reaction with the acid is not too fast, and this is achieved either by a raised Si:Al ratio or by heat-treating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.