Photo-cleavable primer compositions and methods of use

1. A dental adhesive or primer comprising a formulation or a mixture of:

a) a compound of the Formula II:

wherein:

m is 1, 2 or 3; n is 1, 2 or 3; i is 1, 2 or 3;

each EG and EG1 is an end group independently selected from the group consisting of a C 1-12 alkyl, CH 2 ═CH—, CH 2 ═C(C 1-3 alkyl)—, CH 2 ═CHC(O)—, CH 2 ═C(C 1-3 alkyl)C(O)—, CH 2 ═CHC(O)O—, CH 2 ═C(C 1-3 alkyl)C(O)O—, CH 2 ═C(phenyl)C(O)O—, and CH 2 ═C(C 1-3 alkyl)S(O) n O—;

each of SP1, SP2 and SP3 is a spacer independently selected from the group consisting of —O—, —C(O)—, —S—, —S(O)—, —S(O) 2 —, —N—, —NH—, —NCH 3 —, —C—, —CH—, —(CH 2 ) q —, —(CH(OH)) q —, —(CH 2 CH(OH)CH 2 ) q —, —(C(CH 3 ) 2 ) q —, —(CH(CH 3 )) q —, —NH(CH 2 ) 2 NH—, —OC(O)—, —CO 2 —, —NHCH 2 CH 2 C(O)—, —OCH 2 CH 2 C(O)—, —C(O)CH 2 CH 2 C(O)—, —C(O)NHCH 2 CH 2 NH—, —NHCH 2 C(O)—, —NHC(O)—, —C(O)N—, —NC(O)—, —C(O)NH—, —NCH 3 C(O)—, —C(O)NCH 3 —, —(CH 2 CH 2 O) p —, —(CH 2 CH 2 O)pCH 2 CH 2 —, —CH 2 CH 2 —(CH 2 CH 2 O) p —, —OCH(CH 2 O—) 2 —, aryl, cyclopentanyl, cyclohexanyl, unsubstituted phenylenyl and phenylenyl substituted by 1 or 2 substituents selected from the group consisting of halo, CF 3 —, CF 3 O—, CH 3 O—, —C(O)OH, —C(O)OC 1-3 alkyl, —C(O)CH 3 , —CN, —NH 2 , —OH, —NHCH 3 , —N(CH 3 ) 2 and C 1-3 alkyl, p is 1-6, and q is 1-6;

provided that:

at least one of SP1, SP2 and SP3 is a spacer selected from the group consisting of A, B, C, D, and E:

wherein:

Z is C;

each E is halo; and e is 0, 1, 2 or 3; and

provided that when EG and EG1 are both CH 2 ═C(CH 3 )C(O)O—(CH 2 CH 2 )OC(O)—or

CH 2 ═C(CH 3 )C(O)NH—(CH 2 CH 2 )OC(O)—, then the spacer is not

a compound of the formulae 89 to 96, or mixtures thereof

or

Bis-GMA, TEGDMA and DMAEMA; and

b) a primer.

2. The dental adhesive or primer of claim 1 , wherein the formulation is selected from the group consisting of photocleavable primer or resin.

3. The dental adhesive or primer of claim 2 , wherein the photocleavable primer or resin may comprise of about 10-99 wt % when mixed with a dental adhesive, and the acrylate or methacrylate may comprise of about 10-99 wt % when mixed with a dental adhesive.

4. The dental adhesive or primer of claim 1 , wherein the primer is selected from the group consisting of photocleavable dimethacrylates or acrylates.

5. The dental adhesive or primer of claim 4 , wherein the photocleavable dimethacrylates or acrylates comprise of a single photocleavable monomer, a mixture of photocleavable monomers or a mixture of photocleavable monomer(s) and non-photocleavable monomers or monomer blends.

6. The dental adhesive or primer of claim 4 , wherein the camphorquinone is present in the solution at 0.25 wt %, and the 2-dimethylaminoethyl methacrylate is present at about 1 wt %.

7. The dental adhesive or primer of claim 4 , wherein the acrylate or dimethacrylate in the mixture is present in about 50 wt %, 60 wt %, 70 wt %, 80 wt %, 90 wt %, 95 wt %.

8. The dental adhesive or primer of claim 4 , wherein the acrylate or dimethacrylate in the mixture is present in about 40 wt %, 30 wt %, 20 wt %, 10 wt %, 5 wt %, 3 wt % or about 1 wt %.

9. The dental adhesive or primer of claim 1 , wherein the primer is selected from the group consisting of a compound of the formulae 89 to 96, or mixtures thereof

and Bis-GMA, TEGDMA and DMAEMA.

10. The dental adhesive or primer of claim 1 , wherein the primer is selected from the group consisting of camphorquinone (CQ) and 2-dimethylaminoethyl methacrylate (DMAEMA), and a mixture thereof.

11. The dental adhesive or primer of claim 1 , wherein the primer is in a solution.

12. The dental adhesive or primer of claim 11 , wherein the solution is selected from water, organic solvents, or a mixture thereof.

13. The dental adhesive or primer of claim 1 , wherein the primer or resin that is Bis-GMA, TEGDMA and DMAEMA is 1-50 wt % in the composition.

14. The dental adhesive or primer of claim 1 , wherein the range of the concentration of the primer in the solution is selected from 0.0001 wt. % to 20 wt. %, 0.0001 wt. % to 15 wt. %, 0.0001 wt. % to 10 wt. %, about 0.001 wt. % to 10 wt. %, about 0.01 wt. % to 10 wt. %, about 0.1 wt. % to 10 wt. % or at about 0.1 wt. % to 5 wt. %.

15. The dental adhesive or primer of claim 1 , wherein the concentration of the primer in the solution is 0.0001 wt %, 0.001 wt. %, 0.01 wt %, 0.1 wt %, 1.0 wt %, 5 wt %, 10 wt %, 15 wt %, 20 wt %, 25 wt % or more.