Dental composition containing an epoxy functional carbosilane compound

1. A curable dental composition comprising:

a) at least one carbosilane compound comprising

at least one Si-Aryl bond,

at least one silicon atom,

no Si-Oxygen bond, and

at least one aliphatic epoxy moiety,

wherein the carbosilane compound has no glycidyl ether moieties; and

b) an initiator,

wherein the carbosilane compound comprises at least one group of the following general formula (A′):

Aryl-[Si(A) a (D-B) b ] n   (A′)

wherein

each A independently represents an aliphatic or cycloaliphatic moiety having one to six carbon atoms, an aromatic moiety having six to 14 carbon atoms or an aliphatic aromatic or aromatic aliphatic moiety having 8 to 16 carbon atoms,

each B independently represents an aliphatic epoxy moiety having two to six carbon atoms,

each D independently represents an aliphatic or cycloaliphatic moiety having two to 10 carbon atoms, an aromatic or aromatic aliphatic moiety having six to 14 carbon atoms,

wherein one or more C or H atoms can be replaced by 0, Br, Cl or Si,

each Aryl independently represents a substituted or non substituted aromatic moiety having six to 14 carbon atoms,

a is 0, 1 or 2,

b is 1, 2 or 3,

a+b is 3, and

n is 1, 2, 3, 4, 5 or 6.

2. The dental composition of claim 1 , further comprising a filler.

3. The dental composition of claim 2 , further comprising an additive selected from the group of modifiers, stabilizers, dyes, pigments, thixotropic agents, flow improvers, polymeric thickeners, surfactants, odorous substances, diluting agents and flavorings.

4. The dental composition of claim 1 , wherein

the carbosilane compound has a refractive index above 1.500;

the carbosilane compound has a viscosity below 40 Pas;

the carbosilane compound has a weight an average molecular mass from 300 to 10 000 g/mol; or

the opacity of the cured dental composition is below 93%.

5. The dental composition according to claim 3 , comprising

from about 1 to about 90 wt.-% of the carbosilane compound,

from about 0.01 to about 25 wt.-% of the initiator,

from about 0 to about 90 wt.-% of the filler, and

from about 0 to about 25 wt.-% of the additive,

with respect to the whole composition.

6. The dental composition of claim 1 , wherein the carbosilane compound comprises at least one group of the following general formula (A″):

Aryl-[Si(A) a (D-B) b ] n   (A″)

wherein

each A independently represents methyl, phenyl or 2-phenylethyl,

each B independently represents 2,3-Epoxypropyl,

each D independently represents an aliphatic or cycloaliphatic moiety having four to 8 carbon atoms or an aromatic aliphatic moiety having seven carbon atoms, wherein one or more C or H atoms can be replaced by O, Br, Cl, and Si,

each Aryl independently represents benzene, (2,3-epoxypropyl)benzene, naphthalene, alkoxybenzene, alkoxy naphthalene, bisphenol A ether or bisphenol F ether,

a is 0, 1 or 2,

b is 1, 2 or 3,

a+b is 3, and

n is 1, 2, 3, 4, 5 or 6.

7. The dental composition of claim 1 , wherein the carbosilane compound is represented by the following formula (Ia):

{Aryl-[Si(A) a (D-B) b ] n } m   (Ia)

wherein

m is 1,

n is 1,

and the other indices are as defined in claim 1 .

8. The dental composition of claim 1 , wherein the carbosilane compound is represented by the following formula (1b):

B-D-E-{Aryl-[Si(A) a (D-B) b ] n } m   (Ib)

wherein

m is 1,

n is 1,

E represents an aliphatic or cycloaliphatic moiety having five to 11 carbon atoms wherein one or more C or H atoms can be replaced by 0, Br, Cl or Si, and the other indices are as defined in claim 1 .

9. The dental composition of claim 1 , wherein the carbosilane compound is represented by the following formula (II):

{Aryl-[Si(A) a (D-B) b ] n } m   (II)

wherein

m is 1

n is 2, 3, 4, 5 or 6 and

the other indices are as defined in claim 1 .

10. The dental composition of claim 1 , wherein the carbosilane compound is represented by the following formula (IIIa):

F-{Aryl-[Si(A) a (D-B) b ] n } m   (IIIa)

wherein

m is 2, 3 or 4

n is 1, 2, 3, 4, 5 or 6,

F represents an aliphatic or cycloaliphatic moiety having 0 to 25 carbon atoms or an aromatic moiety having 0 to 20 carbon atoms wherein one or more C or H atoms can be replaced by O, Br, Cl or Si and

the other indices are as defined in claim 1 .

11. The dental composition of claim 1 , wherein the carbosilane compound is represented by the following formula (IIIb):

Aryl-[Si(A) a (D-B) b ] n   (IIIb)

wherein

Aryl represents (2,3-epoxypropyl)benzene,

each A independently represents an aliphatic or cycloaliphatic moiety having one to six carbon atoms or an aromatic or aliphatic aromatic moiety having six to 16 carbon atoms,

each B independently represents a terminal C 2 based epoxy moiety,

each D independently represents an aromatic aliphatic moiety having seven to 14 carbon atoms,

a is 0, 1 or 2;

b is 1, 2 or 3;

n is 1, and

the other indices are as defined in claim 1 .

12. The dental composition of claim 1 , wherein the carbosilane compound is represented by the following formula (IV):

G-{Aryl-[Si(A) a (D-B) b ] n } m   (IV)

wherein

G represents an aliphatic, cycloaliphatic, aromatic, (cyclo)aliphatic aromatic or aromatic (cyclo)aliphatic moiety having one to 200 carbon atoms wherein one or more C or H atoms can be replaced by O, Br, Cl, and Si,

m is 2, 3 or 4,

n is 1, 2, 3, 4, 5 or 6, and

the other indices are as defined in claim 1 .

13. The dental composition of claim 1 , wherein the carbosilane compound is represented by one of the following formulas (IVa) and (IVb):

wherein

each Q independently represents H or methyl,

each R, S independently represent H, phenyl or a branched or unbranched alkyl moiety having one to 8 carbon atoms, wherein R and S together may form a cycloaliphatic ring,

each T, U independently represent H, methyl or ethyl, each V, W, X, Y independently represent H, Br, Cl or F,

p is 0, 1, 2, 3 or 4

q is 0, 1, 2, 3, 4 or 5, and

the other indices are as defined in claim 1 .

14. The dental composition of claim 1 , wherein the carbosilane compound is selected from the group consisting of

15. The dental composition of claim 1 , wherein the initiator comprises a light curing initiator or a redox curing initiator or a combination of both.

16. The dental composition of claim 1 , wherein the filler comprises reinforcing and/or non-reinforcing fillers.

17. A container or cartridge filled with the dental composition of claim 1 .

18. A method for preparing a dental material comprising the steps of:

a) providing the dental composition of claim 1 ;

b) applying the dental composition to a surface; and

c) curing the dental composition.

19. The dental composition of claim 1 , wherein at least one B comprises a terminal C 2 based epoxy moiety.

20. The dental composition of claim 6 , wherein at least one D comprises an α,3- or α,4-toluenediyl with the phenyl ring attached to Si and the methylene group attached to aliphatic epoxy moiety B.

21. The dental composition of claim 11 , wherein at least one D comprises an α,3- or α,4-toluenediyl.