One-part anaerobically curable compositions

1. An anaerobically curable composition comprising:

one or more polymerizable (meth) acrylate ester monomers,

a redox-active metal catalyst,

saccharin or a saccharin derivative,

a peroxide, and

a benzoyl functionalized compound,

wherein the benzoyl functionalized compound and the redox-active metal catalyst are present in the composition in a ratio of at least 3:1,

wherein the composition does not gel after about 24 hours of storage at room temperature.

2. The anaerobically curable composition of claim 1 , wherein the composition further comprises one or more oligomeric polymerizable (meth) acrylate monomers.

3. The anaerobically curable composition of claim 1 , wherein the composition further comprises an amine.

4. The anaerobically curable composition of claim 3 , wherein the amine is a secondary aromatic amine.

5. The anaerobically curable composition of claim 1 , wherein the composition further comprises a free radical stabilizer, acrylic acid, silica or inorganic fillers, chelators, or a combination thereof.

6. The anaerobically curable composition of claim 1 , wherein the benzoyl functionalized compound is a photoinitiator.

7. The anaerobically curable composition of claim 6 , wherein the photoinitiator is selected from the group consisting of: 1-hydroxycyclohexyl phenyl ketone; 2-methyl-1-[4-(methylthio) phenyl]-2-morpholino-propan-1-one; 2-benzyl-2-N, N-dimethylamino-1-(4-morpholinophenyl)-1-butanone; a combination of 1-hydroxy cyclohexyl phenyl ketone and benzophenone; 2,2-dimethoxy-2-phenyl acetophenone; a combination of bis (2,6-dimethoxybenzoyl-2,4,4-trimethyl pentyl phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one; 2-hydroxy-2-methyl-1-phenyl-1-propane; a combination of 2,4,6-trimethylbenzoyldiphenyl-phosphine oxide and 2-hydroxy 2-methyl-1-phenyl-propan-1-one;

and, any combination thereof.

8. The anaerobically curable composition of claim 1 , wherein the composition is capable of cure at less than about 85° C.

9. The anaerobically curable composition of claim 1 , wherein the redox-active metal catalyst is iron (II) naphthenate, EDTA.2Na. Cu (II), ff copper naphthenate, vanadium acetylacetonate, vanadyl acetylacetonate, iron (II) acetate, or a combination thereof.

10. The anaerobically curable composition of claim 1 , wherein the peroxide is present in an amount from about 0.5 to about 10 wt. % based on the total weight of the composition.

11. The anaerobically curable composition of claim 1 , wherein the benzoyl functionalized compound is present in an amount from about 0.1 to about 5 wt. % based on the total weight of the composition.

12. The anaerobically curable composition of claim 1 , wherein the redox-active metal catalyst in an amount from about 0.0001 to about 2 wt. % based on the total weight of the composition.

13. A method of adhering two substrates comprising:

obtaining two substrates, each having surfaces;

applying an anaerobically curable composition of claim 1 to one or both substrates;

combining the two substrates;

thermally curing the anaerobically curable composition at about 60° C. to about 80° C. for about 20 min,

wherein one substrate of the two substrates is a plastic substrate,

wherein the surfaces of the substrates are not activated or otherwise primed.

14. The method of claim 13 , wherein the anaerobically curable composition comprises a benzoyl functionalized compound that is a photoinitiator.

15. An assembly comprising two substrates bonded together by a cure product of an anaerobically curable composition according to Claim 1 .

16. A method of adhering two substrates comprising:

obtaining two substrates, each having surfaces;

applying to one or both of the substrates an anaerobically curable composition comprising:

one or more polymerizable (meth) acrylate ester monomers,

a redox-active metal catalyst,

saccharin or a saccharin derivative,

peroxide, and

a benzoyl functionalized compound,

wherein the benzoyl functionalized compound and the redox-active metal catalyst are present in the composition in a ratio of at least 3:1;

combining the two substrates;

thermally curing the anaerobically curable composition at less than about 80° C. for about 20 min,

wherein one substrate of the two substrates is a plastic substrate,

wherein the surfaces of the substrates are not activated or otherwise primed.

17. The method of claim 16 , wherein the benzoyl functionalized compound is a photoinitiator.

18. The method of claim 17 , wherein the photoinitiator is selected from the group consisting of: 1-hydroxycyclohexyl phenyl ketone; 2-methyl-1-[4-(methylthio) phenyl]-2-morpholino-propan-1-one; 2-benzyl-2-N,N-dimethylamino-1-(4-morpholinophenyl)-1-butanone; a combination of 1-hydroxy cyclohexyl phenyl ketone and benzophenone; 2,2-dimethoxy-2-phenyl acetophenone; a combination of bis (2,6-dimethoxybenzoyl-2,4,4-trimethyl pentyl phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one; 2-hydroxy-2-methyl-1-phenyl-1-propane; a combination of 2,4,6-trimethylbenzoyldiphenyl-phosphine oxide and 2-hydroxy 2-methyl-1-phenyl-propan-1-one;

and, any combination thereof.