초록 ▼

The invention features compositions comprising at least one monomer that comprises a cyclic dithiane moiety attached to a (meth)acryloyl moiety. The composition may optionally contain additional polymerizable compounds, such as ethylenically unsaturated compounds, that are typically used in dental c

The invention features compositions comprising at least one monomer that comprises a cyclic dithiane moiety attached to a (meth)acryloyl moiety. The composition may optionally contain additional polymerizable compounds, such as ethylenically unsaturated compounds, that are typically used in dental compositions.

대표청구항 ▼

The invention claimed is: 1. A curable composition comprising: a) a compound of the formula wherein X and X' are each independently an--O--or--NR1--, where R1 is an H or a C1-C4 alkyl group; each R5 is independently an H, or a C1-C4 alkyl group, R4 is an organic radical having a valence of x+y,

The invention claimed is: 1. A curable composition comprising: a) a compound of the formula wherein X and X' are each independently an--O--or--NR1--, where R1 is an H or a C1-C4 alkyl group; each R5 is independently an H, or a C1-C4 alkyl group, R4 is an organic radical having a valence of x+y, n is 3 to 6, m is 1 to 3, o is 1 to 3, x and y are at least 1, one or more methylene groups on the ring may be substituted with C1-C4 alkyl group, and adjacent alkyl groups may be joined with the carbon atoms to which they are attached to form a carbocyclic ring, and b) an initiator. 2. The composition of claim 1 wherein n, m and o are numbers such that the ring has 8 to 9 ring atoms. 3. The composition of claim 1 wherein n is at least 3. 4. The composition of claim 1 wherein R4 is selected from arylene, cycloalkylene and alkylene, said alkylene and arylene optionally further substituted by one or more catenary--O--or--NR1--groups, and may further comprise a functional group selected from carbonyl, acyl, amide, urethane and urea. 5. The composition of claim 1, where x and y are 1. 6. The composition of claim 1 wherein said initiator is a photoinitiator. 7. The composition of claim 1 wherein said initiator is a redox initiator. 8. The composition of claim 6, wherein the photoinitiator comprises an electron donor, an iodonium salt, and a photosensitizer. 9. The composition of claim 8, wherein the photoinitiator comprises at least 0.04 wt-% of a photosensitizer. 10. The composition of claim 6, wherein the photoinitiator comprises a phosphine oxide capable of absorbing light in the range of about 300 to about 600 nm. 11. The composition of claim 1 wherein the composition further rises a filler. 12. The composition, of claim 1 further comprising a poly(meth)acryloyl compound. 13. The composition of claim 12, wherein the poly(meth)acryloyl compound is selected from the group consisting of ethoxylated bisphenol A dimethacrylate (BisEMA6), bisphenol A diglycidyl dimethacrylate (bisGMA), urethane dimethacrylate (UDMA), triethlyene glycol dimethacrylate (TEGDMA), glycerol dimethacrylate(GDMA), ethylenegylcol dimethacrylate, neopentylgylcol dimethacrylate (NPGDMA), and polyethyleneglycol dimethacrylate (PEGDMA). 14. The composition of claim 12 comprising: a) 5 to 35 wt. % of said compound, b) 0 to 20 wt. % of other mono(meth)acryloyl compounds, and c) 65 to 95 wt. % of poly(meth)acryloyl compound, based on the total weight of the unfilled composition. 15. The composition of claim 14 comprising 10 to 60 wt. % total monomers and 90 to 40 wt. % filler. 16. The composition of claim 15, which when cured, exhibits a Watts shrinkage of less than 2%. 17. The composition of claim 15, which when cured, exhibits a Barcol Hardness of at least 60. 18. A polymer composition comprising the polymerized composition of claim 14. 19. A method of preparing a dental restorative, the method comprising: providing a curable dental composition of claim 1, applying the composition to a tooth of a patient; and curing the composition.