Dental materials with debonding-on-demand properties

1. Radically polymerizable dental material which contains at least one compound of Formula I:

with:

A=H; —CN; a phenyl residue which can carry one or more substituents; or an aliphatic linear or branched C 1 -C 20 alkylene residue which can be interrupted by one or more 1,4-phenylene groups, urethane groups, O or S and which can carry in the terminal position a polymerizable vinyl, (meth)acryloyloxy or (meth)acrylamide group;

R 1 =H, an aliphatic linear or branched C 1 -C 9 alkyl radical, tolyl or phenyl;

L=SO 2 R 3 , wherein R 3 is CH 3 or tolyl;

X=—COO—, —CON(R 10 )— or is absent, wherein the bond to A takes place via O or N and

R 10 =H; or is an aliphatic linear or branched C 1 -C 20 alkylene residue which can be interrupted by one or more O or S and which can carry in the terminal position a polymerizable vinyl, (meth)acryloyloxy, (meth)acrylamide group, —C(═CH 2 )—COOR 11 or —C(═CH 2 )—CO—NR 12 R 13 , wherein R 11-13 in each case independently of each other are a linear or branched C 1-6 residue;

n=an integer from 1 to 6,

and at least one thermolabile radically polymerizable compound and/or at least one photolabile radically polymerizable compound.

2. Dental material according to claim 1 , wherein the variables of Formula I have the following meanings:

A H, —CN, a phenyl residue, an aliphatic linear or branched C 1 -C 15 alkyl residue which can be interrupted by one or more 1,4-phenylene groups, urethane groups or O and which can carry in the terminal position a polymerizable (meth)acryloyloxy group;

R 1 H, phenyl, tolyl, an aliphatic linear C 1 -C 3 alkyl radical;

L SR 2 or SO 2 R 3 , wherein

R 2-3 in each case independently of each other are an aliphatic linear or branched C 1 -C 20 alkylene residue which can be interrupted by O and which can carry in the terminal position a polymerizable (meth)acryloyloxy group or —C(═CH 2 )—COOR 11 , wherein R 11 is a linear or branched C 1-3 radical; or a phenyl residue which can carry one or more substituents;

X —COO— or —CON(R 10 )—, wherein R 10 is methyl, or is absent;

n 1 or 2.

3. Dental material according to claim 2 , wherein the variables of Formula I have the following meanings:

A a saturated, linear aliphatic hydrocarbon residue with 1 to 12 carbon atoms which can be interrupted by one or more 1,4-phenylene groups, urethane groups or O and which can carry a methacryloyloxy group,

X —COO— or —CON(R 10 )—, wherein R 10 is methyl, or is absent;

R 1 H,

n 1 or 2.

4. Dental material according to claim 3 , wherein the variables of Formula I have the following meanings:

A a saturated, linear aliphatic hydrocarbon residue with 6 to 12 carbon atoms which can be interrupted by 1 to 3 O atoms,

X —COO—;

R 1 H,

L SO 2 R 3 , wherein R 3 is CH 3 or tolyl,

n 1 or 2.

5. Dental material according to claim 1 , which contains, as thermolabile radically polymerizable compound, a thermolabile multifunctional (meth)acrylate or (meth)acrylamide and/or, as photolabile radically polymerizable compound, at least one photolabile multifunctional (meth)acrylate or (meth)acrylamide.

6. Dental material according to claim 1 , which contains, as the thermolabile radically polymerizable compound, a monomer which is selected from polyfunctional (meth)acrylates or (meth)acrylamides with at least one thermolabile group between two (meth)acryl or (meth)acrylamide groups, the Diels-Alder adduct from furfuryl methacrylate and N-(3-(methacryloyloxy)propyl)-maleimide, the reaction products of N-hydroxy-(meth)acrylamide with di- or triisocyanates, hexamethylene-1,6-diisocyanate (HDI), 2,2,4-trimethylhexamethylene-1,6-diisocyanate or the HDI trimer, products which can be obtained by the stoichiometric reaction of di- or triisocyanates with 1-hydroxymethylacrylic acid esters, 1-hydroxymethylacrylic acid ethyl ester, with β-keto ester (meth)acrylates or 2-acetoacetoxyethyl methacrylate, thermolabile cross-linking monomers which release gas, the esterification products of azobis(4-cyanovaleric acid) with hydroxyalkyl (meth)acrylates, hydroxyethyl (meth)acrylate, hydroxylpropyl (meth)acrylate, N-(hydroxyalkyl)(meth)acrylamides, N-(5-hydroxypentyl)methacrylamide or N-methyl-N-(2-hydroxyethyl)acrylamide.

7. Dental material according to claim 1 , which contains, as the photolabile radically polymerizable compound, a monomer with a photolabile group which is selected from benzoin ethers, oxyalkylphenylacetophenones, dialkyloxyacetophenones, benzoyl diphenylphosphine oxides, dibenzoyl phenylphosphine oxides, dialkyl benzoyl and dialkyl dibenzoyl germanium derivatives.

8. Dental material according to claim 1 , which contains, as the photolabile radically polymerizable compound, a monomer with one photolabile group and two polymerizable (meth)acrylate groups, bis-(4-methacryloyloxybenzoyldiethyl germanium, bis-{4-[2-(methacryloyloxy)diethylcarbamoyloxybenzoyl}diethyl germanium, bis-[3-(methacryloyloxymethyl)-2,4,6-trimethylbenzoyl]-phenylphosphine oxide or methacrylic acid 2-[2-(4-{2-methyl-2-[2-(methacryloyloxy)ethylcarbamoyloxy]-propionyl}-phenoxy)-ethoxycarbonylamino]ethyl ester.

9. Dental material according to claim 1 , which additionally contains at least one multifunctional (meth)acrylate or a mixture of mono- and multifunctional (meth)acrylates.

10. Dental material according to claim 1 , which additionally contains at least one radically polymerizable, acid-group-containing monomer.

11. Dental material according to claim 1 , which additionally contains at least one initiator for the radical polymerization.

12. Dental material according to claim 1 , which additionally contains an initiator(s), wherein the dental material comprises

0.5 to 60 wt.-% of at least one compound of general formula I,

0.01 to 5.0 wt.-% initiator(s) for the radical polymerization, and

1 to 60 wt.-% difunctional thermo- and/or photolabile (meth)acrylate(s), in each case relative to the total mass of the dental material.

13. Dental material according to claim 12 , which may additionally contain a monofunctional (meth)acrylate(s), a filler(s), an expanding additive(s), a radiation-to-heat converter(s), a solvent(s) and other additive(s), and further contains a multifunctional (meth)acrylate(s), and has the following composition:

(a) 1 to 80 wt.-% multifunctional (meth)acrylate(s),

(b) 0.01 to 5.0 wt.-% wt.-% initiator(s),

(c) 0.5 to 60 wt.-% of at least one compound of general formula I,

(d) 0 to 50 wt. % monofunctional (meth)acrylate(s),

(e) 1 to 60 wt.-% difunctional thermo- and/or photolabile (meth)acrylate(s),

(f) 0 to 80 wt.-% filler(s),

(g) 0 to 40 wt.-% expanding additive(s) and/or radiation-to-heat converters,

(h) 0 to 60 wt.-% solvent(s) and

(i) 0 to 5 wt.-% other additive(s),

in each case relative to the total mass of the dental material.

14. Dental material according to claim 11 , wherein the initiator comprises a photoinitiator.

15. Dental material according to claim 12 , which contains

1.0 to 50 wt.-% of at least one compound of general formula I,

0.1 to 5.0 wt.-% initiator(s) for the radical polymerization, and

5 to 50 wt.-% difunctional thermo- and/or photolabile (meth)acrylate(s), in each case relative to the total mass of the dental material.

16. Dental material according to claim 12 , which contains

1.0 to 40 wt.-% of at least one compound of general formula I

0.1 to 3.0 wt.-% initiator(s) for the radical polymerization, and

5 to 40 wt.-% difunctional thermo- and/or photolabile (meth)acrylate(s), in each case relative to the total mass of the dental material.

17. Dental material according to claim 13 , which has the following composition:

(a) 10 to 70 wt.-% multifunctional (meth)acrylate(s),

(b) 0.1 to 5.0 wt.-% initiator(s),

(c) 1.0 to 50 wt.-% of at least one compound of general formula I,

(d) 0 to 40 wt.-% monofunctional (meth)acrylate(s),

(e) 1 to 60 wt.-% difunctional thermo- and/or photolabile (meth)acrylate(s),

(f) 0 to 70 wt.-% filler(s),

(g) 0 to 30 wt.-% expanding additive(s) and/or radiation-to-heat converters,

(h) 0 to 50 wt.-% solvent(s) and

(i) 0 to 3 wt.-% other additive(s),

in each case relative to the total mass of the dental material.

18. Dental material according to claim 13 , which has the following composition:

(a) 10 to 60 wt.-% multifunctional (meth)acrylate(s),

(b) 0.1 to 3.0 wt.-% initiator(s),

(c) 1.0 to 40 wt.-% of at least one compound of general formula I,

(d) 0 to 30 wt.-% monofunctional (meth)acrylate(s),

(e) 5 to 50 wt.-% difunctional thermo- and/or photolabile (meth)acrylate(s),

(f) 0 to 70 wt.-% filler(s),

(g) 5 to 30 wt.-% expanding additive(s) and/or radiation-to-heat converters,

(h) 1 to 50 wt.-% solvent(s) and

(i) 0.5 to 3 wt.-% other additive(s),

in each case relative to the total mass of the dental material.

19. Dental material according to claim 13 , which has the following composition:

(a) 10 to 60 wt.-% multifunctional (meth)acrylate(s),

(b) 0.1 to 3.0 wt.-% initiator(s),

(c) 1.0 to 40 wt.-% of at least one compound of general formula I,

(d) 0 to 30 wt.-% monofunctional (meth)acrylate(s),

(e) 5 to 40 wt.-% difunctional thermo- and/or photolabile (meth)acrylate(s),

(f) 0 to 70 wt.-% filler(s),

(g) 5 to 30 wt.-% expanding additive(s) and/or radiation-to-heat converters,

(h) 1 to 50 wt.-% solvent(s) and

(i) 0.5 to 3 wt.-% other additive(s),

in each case relative to the total mass of the dental material.

20. Dental material according to claim 1 , wherein the substituents in A comprise one or more of CH 3 , C 2 H 5 , OH, OCH 3 , O—COCH 3 , a polymerizable vinyl, (meth)acryloyloxy or (meth)acrylamide group.

21. Dental material according to claim 1 , wherein the substituents in R 2-9 comprise one or more of CH 3 , C 2 H 5 , OH, OCH 3 , —O—COCH 3 , a polymerizable vinyl, (meth)acryloyloxy, (meth)acrylamide group, —C(═CH 2 )—COOR 11 or —C(═CH 2 )—CO—NR 12 R 13 .

22. Dental material according to claim 2 , wherein the substituents in R 2-3 comprise one or more of CH 3 , C 2 H 5 , OCH 3 and/or O—COCH 3 .