Storage-stable accelerator solution

1. A redox system comprising a first solution comprising a peroxide and a second accelerator solution, wherein the accelerator solution consists essentially of:

a) more than 1.0 wt %, based on the total weight of the accelerator solution, of one or more reducing agents, at least one of them being selected from the group consisting of ascorbic acid and sodium formaldehyde sulphoxylate,

b) one or more metal salts, at least one of them being selected from the group consisting of transition metal salts, lithium salts, and magnesium salts,

c) one or more organic oxygen-containing solvents,

d) optionally one or more stabilisers, and

e) optionally water.

2. The redox system according to claim 1 wherein the solvent is selected from the group consisting of ethylene glycol, di-ethylene glycol, polyethylene glycol, triethyl phosphate, dibutyl phosphate, N-methyl pyrrolidone, butyl acetate, ethyl acetate, and mixtures thereof.

3. The redox system according to claim 1 wherein the stabiliser is selected from the group consisting of di-ethanol amine, nicotinamide, alkali metal 2-ethyl hexanoates, diethyl acetoacetamide, itaconic acid, diethyl amine, monobutyl dihydrophosphite, and mixtures thereof.

4. The redox system according to claim 1 wherein the metal salts are selected from the group consisting of copper salts, cobalt salts, iron salts, vanadium salts, and combinations thereof.

5. The redox system according to claim 4 wherein the metal salt is selected from the group consisting of Cu(II) acetate, Cu(II) sulphate, Cu(II) 2-ethyl hexanoate, Co(II) acetate, Fe(II) sulphate, Fe(III) chloride, V(II) 2-ethyl hexanoate, and combinations thereof.

6. The redox system according to claim 1 wherein the accelerator solution consists essentially of:

a) 2-30 wt % of the one or more reducing agents,

b) 0.01-10 wt % of the one or more metal salts,

c) 50-95 wt % of the one or more organic oxygen-containing solvents,

d) 0-20 wt % of the one or more stabilisers, and

e) e) 0-10 wt % water.

7. The redox system according to claim 1 , wherein the solvent is selected from the group consisting of ethylene glycol, di-ethylene glycol, polyethylene glycol, triethyl phosphate, dibutyl phosphate, N-methyl pyrrolidone, butyl acetate, ethyl acetate, and mixtures thereof, and wherein the stabiliser is present and is selected from the group consisting of di-ethanol amine, nicotinamide, alkali metal 2-ethyl hexanoates, diethyl acetoacetamide, itaconic acid, diethyl amine, monobutyl dihydrophosphite, and mixtures thereof.

8. The redox system according to claim 1 , wherein the solvent is selected from the group consisting of ethylene glycol, di-ethylene glycol, polyethylene glycol, triethyl phosphate, dibutyl phosphate, N-methyl pyrrolidone, butyl acetate, ethyl acetate, and mixtures thereof, and wherein the metal salts are selected from the group consisting of copper salts, cobalt salts, iron salts, vanadium salts, and combinations thereof.

9. The redox system according to claim 1 , wherein the stabiliser is present and is selected from the group consisting of di-ethanol amine, nicotinamide, alkali metal 2-ethyl hexanoates, diethyl acetoacetamide, itaconic acid, diethyl amine, monobutyl dihydrophosphite, and mixtures thereof, and wherein the metal salts are selected from the group consisting of copper salts, cobalt salts, iron salts, vanadium salts, and combinations thereof.

10. The redox system according to claim 1 , wherein the solvent is selected from the group consisting of ethylene glycol, di-ethylene glycol, polyethylene glycol, triethyl phosphate, dibutyl phosphate, N-methyl pyrrolidone, butyl acetate, ethyl acetate, and mixtures thereof, wherein the stabiliser is present and is selected from the group consisting of di-ethanol amine, nicotinamide, alkali metal 2-ethyl hexanoates, diethyl acetoacetamide, itaconic acid, diethyl amine, monobutyl dihydrophosphite, and mixtures thereof, and wherein the metal salt is selected from the group consisting of Cu(II) acetate, Cu(II) sulphate, Cu(II) 2-ethyl hexanoate, Co(II) acetate, Fe(II) sulphate, Fe(III) chloride, V(II) 2-ethyl hexanoate, and combinations thereof.

11. The redox system according to claim 9 wherein the metal salt is selected from the group consisting of Cu(II) acetate, Cu(II) sulphate, Cu(II) 2-ethyl hexanoate, Co(II) acetate, Fe(II) sulphate, Fe(III) chloride, V(II) 2-ethyl hexanoate, and combinations thereof.

12. The redox system according to claim 1 , wherein the accelerator solution consists essentially of:

a) 2-30 wt % of the one or more reducing agents,

b) 0.01-10 wt % of the one or more metal salts,

c) 50-95 wt % of the one or more organic oxygen-containing solvents,

d) 0-20 wt % of the one or more stabilisers, and

e) 0-10 wt % water, and

wherein the solvent is selected from the group consisting of ethylene glycol, di-ethylene glycol, polyethylene glycol, triethyl phosphate, dibutyl phosphate, N-methyl pyrrolidone, butyl acetate, ethyl acetate, and mixtures thereof, wherein the stabiliser is present and is selected from the group consisting of di-ethanol amine, nicotinamide, alkali metal 2-ethyl hexanoates, diethyl acetoacetamide, itaconic acid, diethyl amine, monobutyl dihydrophosphite, and mixtures thereof, and wherein the metal salt is selected from the group consisting of Cu(II) acetate, Cu(II) sulphate, Cu(II) 2-ethyl hexanoate, Co(II) acetate, Fe(II) sulphate, Fe(III) chloride, V(II) 2-ethyl hexanoate, and combinations thereof.

13. The redox system according to claim 1 , the accelerator solution consists essentially of:

a) 2-30 wt % of the one or more reducing agents,

b) 0.01-10 wt % of the one or more metal salts,

c) 50-95 wt % of the one or more organic oxygen-containing solvents,

d) 0-20 wt % of the one or more stabilisers, and

e) 0-10 wt % water, and

wherein the stabiliser is present and is selected from the group consisting of di-ethanol amine, nicotinamide, alkali metal 2-ethyl hexanoates, diethyl acetoacetamide, itaconic acid, diethyl amine, monobutyl dihydrophosphite, and mixtures thereof, and wherein the metal salt is selected from the group consisting of Cu(II) acetate, Cu(II) sulphate, Cu(II) 2-ethyl hexanoate, Co(II) acetate, Fe(II) sulphate, Fe(III) chloride, V(II) 2-ethyl hexanoate, and combinations thereof.

14. An accelerator solution suitable for forming a redox system with peroxides, consisting essentially of:

a) more than 1.0 wt %, based on the total weight of the accelerator solution, of one or more reducing agents, at least one of them being selected from the group consisting of ascorbic acid and sodium formaldehyde sulphoxylate,

b) one or more metal salts, at least one of them being selected from the group consisting of transition metal salts, lithium salts, and magnesium salts,

c) one or more organic oxygen-containing solvents selected from the group consisting of ethylene glycol, di-ethylene glycol, polyethylene glycol, triethyl phosphate, dibutyl phosphate, N-methyl pyrrolidone, butyl acetate, ethyl acetate, and mixtures thereof,

d) one or more stabilisers selected from the group consisting of di-ethanol amine, nicotinamide, alkali metal 2-ethyl hexanoates, diethyl acetoacetamide, itaconic acid, diethyl amine, monobutyl dihydrophosphite, and mixtures thereof, and

e) optionally water.

15. The accelerator solution according to claim 14 , wherein the reducing agent is present in an amount from 5 to 20 wt %, the metal salt is present in an amount from 0.1 to 2 wt %, and the solvent is present in an amount of at least 50 wt %, all based on the accelerator solution.

16. The accelerator solution according to claim 15 , wherein the stabiliser is present in an amount from 0.1 to 10 wt %, based on the accelerator solution.

17. The accelerator solution according to claim 16 , wherein the accelerator solution has a storage stability of at least 8 weeks.