Composite filler and dental composition containing the same
US4362842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1980 |
| Grant date | Dec 7, 1982 |
| Priority date | — |
| Expiry date | Jul 22, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F292/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A composite filler obtained by precuring the acrylate or methacrylate of a polyhydric alcohol having at least three ethylenically unsaturated groups in the molecule thereof by using a free-radical initiator in the presence of an inorganic filler, followed by grinding the resultant prepolymer is described. This composite filler remarkably improves the stiffness and hardness of organic resins and rubbers, and prevents a decrease in the impact strength and bending strength of organic resins and rubbers when the composite fillers are compounded into the organic resins and rubbers. Furthermore, a dental composition obtained from the polymerization of a vinyl compound in the presence of the above-mentioned composite filler is described. This dental composition has excellent properties, such as, high hardness, high strength, good adhesiveness, and is suitable for use as dental materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.