Polyether-based dental impression material curable by metathesis reaction

1. A dental impression material comprising:

(a) a base paste comprising a first base resin and a second base resin, wherein

(1) the first base resin is an urethane polyester carboxylate backbone or an urethane polyether carboxylate backbone, functionalized with at least two cycloolefin groups capable of undergoing a metathesis reaction, the first base resin having the formula:

wherein:

a=1-100, c=0 or 1 and d=2-100,

Q is a linear, branched, cyclic or polycyclic organic residue optionally containing siloxane groups (Si—O—Si) and optionally containing heteroatoms selected from the group consisting of B, N, O, Si, P, and S,

Z is a linear, branched, cyclic or polycyclic urethane polyether or urethane polyester optionally containing siloxane groups (Si—O—Si) and optionally containing heteroatoms selected from the group consisting of B, N, O, Si, P, and S, and

D is a cycloolefinic residue and is different than Q or Z; and

(2) the second base resin is an alkoxy-siloxane polyester carboxylate backbone or an alkoxy-siloxane polyether carboxylate backbone, functionalized with at least two cycloolefin groups capable of undergoing a metathesis reaction, the second base resin having the formula:

wherein:

PE is a polyether or polyester fragment,

m=1-500,

q=0-10,

Q is a linear, branched, cyclic or polycyclic organic residue optionally containing siloxane groups (Si—O—Si) and optionally containing heteroatoms selected from the group consisting of B, N, O, Si, P, and S, and

D is a cycloolefinic residue and is different than Q or Z; and

(b) a catalyst paste comprising a metal carbene complex catalyst dissolved in a solvent that is miscible with the base paste and capable of initiating the metathesis reaction when the catalyst paste is mixed with the base paste, wherein the catalyst has the structure:

wherein:

M is ruthenium or osmium,

X is an alkylidene ligand with basicity higher than that of tricyclohexylphosphine (PCy 3 ),

X 2 and X 3 are either the same or different and are any anionic ligand,

Z is oxygen (O) or sulfur (S), and

R 4 , R 5 , a, b, c, and d are the same or different and are each a linear, branched, cyclic or polycyclic organic residue optionally containing siloxane groups (Si—O—Si) and optionally containing heteroatoms selected from the group consisting of B, N, O, Si, P, and S.

2. The composition of claim 1 wherein the first base resin is a dinorbornenyl dicarboxylate urethane polyester.

3. The composition of claim 1 wherein the first base resin is a dinorbornenyl dicarboxylate urethane polyether.

4. The composition of claim 1 wherein the first base resin has the following structure:

where E=a cycloolefinic endcapper D, R=a diisocyanate fragment, and PE=a polyol.

5. The composition of claim 1 wherein the first base resin is a difunctional urethane polyether carboxylate and the polyether comprises one or more of butylene oxide units, ethylene oxide units or propylene oxide units, or combinations thereof.

6. The composition of claim 1 wherein D is a cycloolefinic residue selected from the group consisting of norbornenyl, norbornenylethyl, cyclopentenyl, 7-oxanorbornenyl, norbornadienyl, and 7-oxanorbornadienyl.

7. The composition of claim 1 wherein the catalyst has the structure:

wherein R is mesityl.

8. The composition of claim 1 wherein the first base resin is:

where R hexyl, PE polyether, and

9. The composition of claim 1 wherein, in the second base resin, PE is a polyether containing propylene oxide (PO) and ethylene oxide (EO) fragments, m is about 16, q 0 or 1 and

10. The composition of claim 1 wherein, in the second base resin, PE is a polyether containing propylene oxide (PO) and ethylene oxide (EO) fragments, m=1-50, q 0-1 and

11. The composition of claim 1 wherein the base paste further comprises a third base resin that is a siloxane carboxylate backbone functionalized with at least two cycloolefin groups capable of undergoing a metathesis reaction.

12. The composition of claim 11 wherein the third base resin is a pendant structure having the following formula:

where m=1-50, n=0-200 and

13. The composition of claim 11 wherein the third base resin is a terminated structure having the following formula:

where p=0-200 and

14. The composition of claim 11 wherein the third base resin is a cyclic structure having the following formula:

where x=3-6 and

15. The composition of claim 1 wherein the base paste and catalyst paste each further comprise a reinforcing filler and a non-reinforcing filler.

16. The composition of claim 1 wherein the base paste further comprises a hydrophilic filler.

17. The composition of claim 1 wherein the catalyst paste further comprises a hydrophobic filler.

18. The composition of claim 1 , wherein the first base resin is

wherein the base paste further comprises a third base resin capable of undergoing a metathesis reaction and selected from at least one of:

a pendant structure having the following formula:

a terminated structure having the following formula:

or

a cyclic structure having the following formula:

wherein R=a diisocyanate fragment, PE=a polyester or polyether fragment, m=1-50, q=0-1, n=0-200, p=0-200, x=3-6 and E is a cycloolefinic residue selected from the group consisting of norbornenyl, norbornenylethyl, cyclopentenyl, 7-oxanorbornenyl, norbornadienyl, and 7-oxanorbornadienyl; and

wherein the base paste further comprises a hydrophilic filler component and the catalyst paste further comprises a hydrophobic filler component.

19. The composition of claim 18 wherein the catalyst has the structure:

wherein R is mesityl.

20. The composition of claim 18 wherein PE=a polyether containing propylene oxide (PO) and ethylene oxide (EO) fragments and