Poly(vinylphosphonic acid) glass ionomer cement
US5179135A · kind A · utility
14Cited by
3References
14Claims
0Family size
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Key dates
| Filing date | Oct 26, 1990 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Oct 26, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K6/30
- 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 cement. 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. The glass contains heavy ions such as La, Ba or Sr.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.