Polyurethaneurea system

1. A polyurethaneurea system for bonding to a cross-linked rubber surface, wherein reaction components react to form polyurethaneurea, the reaction components comprising:

part A, wherein part A is a mixture comprising:

between about 55 and about 75 wt. % of an oligomeric polyol having an average molecular weight greater than about 1000;

between about 3 and 7 wt % of an aromatic diamine chain extender; and

between about 0.1 and about 1.5 wt. % of a reactivity catalyst; and

part B, wherein part B is a mixture comprising:

between about 1 and about 15 wt. % of a short aromatic diisocyanate;

between about 5 and about 35 wt. % of an aromatic diisocyanate prepolymer that is the reaction product of a short aromatic diisocyanate and a diol, wherein the mass fraction of each of the reaction components is based upon the total mass of the part A and part B reaction components; and

between 0.7 and about 5 wt. % of protectorants;

wherein said protectorants are selected from the group consisting of UV absorbers and light stabilizers, or a combination thereof, and

wherein said protectorants may be added to said part A or part B or both; and

an elastomer-surface activator adapted for application to the cross-linked rubber surface consisting of a solvent mixed with activators consisting essentially of a second short aromatic diisocyanate and a second aromatic diisocyanate prepolymer.

2. The polyurethaneurea system of claim 1 , wherein the oligomeric polyol comprises greater than 50 wt. % primary oligomeric polyol.

3. The polyurethaneurea system of claim 1 , wherein the oligomeric polyol comprises greater than about 95 wt. % primary oligomeric polyol.

4. The polyurethaneurea system of claim 1 , wherein at least one of the second diisocyanates is the same as at least one of the diisocyanates.

5. The polyurethaneurea system of claim 1 , wherein the elastomer-surface activator includes between 5 and 80 wt. % of the short aromatic diisocyanate, wherein the mass fraction is based upon the total mass of the diisocyanates in the elastomer-surface activator.

6. The polyurethaneurea system of claim 1 , wherein the short aromatic diisocyanate is a polycarbodiimide-modified diphenylmethane diisocyanate.

7. The polyurethaneurea system of claim 1 , wherein the short aromatic diisocyanate is selected from 2,4 and/or 2,6 toluene diisocyanate (TDI), 4,4′-diphenylmethane diisocyanate (MDI), polymeric MDI, modified MDI compounds, naphthalene diisocyanate (NDI) or combinations thereof.

8. The polyurethaneurea system of claim 1 , wherein the aromatic diisocyanate prepolymer is an MDI-terminated polyether diisocyanate.

9. The polyurethaneurea system of claim 1 , wherein the aromatic diisocyanate prepolymer is the reaction product of the diol that is selected from a polyether-based diol, a polyester-based diol or combinations thereof.

10. The polyurethaneurea system of claim 1 , wherein the oligomeric polyol is a polytetramethyleneglycol having an average molecular weight between about 1500 and about 4000.

11. The polyurethaneurea system of claim 1 , wherein the aromatic diamine chain extender is a mixture of 2,4 and 2,6 isomers of dimethylthiotoluenediamine.

12. The polyurethaneurea system of claim 1 , wherein a ratio of isocyanate functionalities to a total of the amine and hydroxyl functionalities in a mixture of part A and part B is between 0.8 and 2.

13. The polyurethaneurea system of claim 12 , wherein the ratio of isocyanate functionalities to the total of the amine and hydroxyl functionalities in the mixture of part A and part B is between 1.0 and 1.07.

14. A process, comprising:

reacting the following reaction components in mass fraction relative to the total mass of reactants to form a polyurethane urea repair material:

part A, wherein part A is a mixture comprising:

between about 55 and about 75 wt. % of an oligomeric polyol having an average molecular weight greater than about 1000;

between about 3 and 7 wt. % of an aromatic diamine chain extender; and

part B, wherein part B is a mixture comprising:

between about 1 and about 15 wt. % of a short aromatic diisocyanate;

between about 5 and about 35 wt. % of an aromatic diisocyanate prepolymer that is the reaction product of a short aromatic diisocyanate and a diol,

wherein the mass fraction of each of the reaction components is based upon the total

mass of the part A and part B reaction components;

between 0.7 and about 5 wt. % of protectorants;

wherein said protectorants are selected from the group consisting of UV absorbers and light stabilizers, or a combination thereof, and

wherein said protectorants may be added to said part A or part B or both; and

applying an elastomer-surface activator to a cross-linked rubber surface consisting of a solvent mixed with activators consisting essentially of a second short aromatic diisocyanate and a second aromatic diisocyanate prepolyrner to a cross-linked rubber surface; and then

applying the polyurethaneurea repair material to the cross-linked rubber surface.

15. An article, comprising:

a component bonded to the article with the polyurethaneurea system of claim 1 , wherein at least one of the bonded faces between the component and the article are of cross-linked rubber composition.

16. The article of claim 15 , wherein a face of the component comprises a synthetic fabric, a thermosetting polymer, a ferrous metal, an iron-based metal alloy or combinations thereof.