Elastomeric latices and coating compositions containing the same

1. An elastomeric latex comprising:

a) a copolymer, the copolymer comprising a reaction product of reactants comprising:

i) a mono-ethylenically unsaturated monomer having a glass transition temperature less than −20° C.;

ii) a mono-ethylenically unsaturated monomer having a glass transition temperature greater than 40° C.;

iii) an N-methylol functional ethylenically unsaturated monomer; and

iv) an adhesion promoter comprising an ethylenically unsaturated alkoxysilane monomer;

b) a photoinitiator; and

c) an aqueous medium.

2. The elastomeric latex of claim 1 wherein i) is present in an amount of 55 to 85 wt. %; ii) is present in an amount of 10 to 40 wt. %; iii) is present in amount of 1 to 10 wt. %; iv) is present in an amount of 0.1 to 2 wt. %, all weight percents based on total solids weight of the reactants.

3. The elastomeric latex of claim 1 wherein (i) the mono-ethylenically unsaturated monomer having a glass transition temperature less than −20° C. is present in an amount of 70 to 85 wt. %; (ii) the mono-ethylenically unsaturated monomer having a glass transition temperature greater than 40° C. is present in an amount of 10 to 30 wt. %; (iii) the N-methylol functional ethylenically unsaturated monomer is present in an amount of 1.5 to 5 wt. %; and (iv) the adhesion promoter is present in an amount of 0.1 to 1.9 wt. % all weight percents based on the total solids of the reactants.

4. The elastomeric latex of claim 1 , wherein the mono-ethylenically unsaturated monomer having a glass transition temperature less than −20° C. comprises a non-functional acrylic monomer.

5. The elastomeric latex of claim 4 , wherein the non-functional acrylic monomer comprises butyl acrylate, isobutyl acrylate, isodecyl methacrylate, lauryl methacrylate, tridecylmethacrylate, 2-ethylhexyl acrylate or combinations thereof.

6. The elastomeric latex of claim 1 , wherein the mono-ethylenically unsaturated monomer having a glass transition temperature greater than 40° C. comprises vinyl halides, alkenyl aromatic monomers, styrene, p-methyl styrene, o-methyl styrene, o,p-dimethyl styrene, o,p-diethyl styrene, isopropyl styrene, t-butyl styrene, o-methyl-p-isopropyl styrene, methacrylamide or combinations thereof.

7. The elastomeric latex of claim 1 , wherein the N-methylol functional ethylenically unsaturated monomer comprises N-methylol acrylamide, N-methylol methacrylamide, or combinations thereof.

8. The elastomeric latex of claim 1 , wherein the adhesion promoter comprises vinyl trimethoxysilane, vinyl triethoxysilane, vinyl-tris-(2-methoxyethoxy) silane, or combinations thereof.

9. The elastomeric latex of claim 1 , wherein the reaction product further comprises an acid functional monomer present in an amount of 0.5 to 3 wt. % based on the total solids content of the reactants.

10. The elastomeric latex of claim 9 , wherein the acid functional monomer comprises acrylic acid, methacrylic acid or itaconic acid, or combinations thereof.

11. The elastomeric latex of claim 1 , wherein the photoinitiator is present in an amount less than 5 wt. % based on the total solids of the latex.

12. The elastomeric latex of claim 1 , wherein the photoinitiator comprises an aromatic ketone.

13. The elastomeric latex of claim 1 , wherein the solids content of the latex is from 40 to 65 wt. % based on the total of components of the latex.

14. The elastomeric latex of claim 1 , wherein the aqueous medium is present in an amount of 35 to about 60 wt. % based on the total of components of the latex.

15. The elastomeric latex of claim 1 , wherein the latex has a glass transition temperature less than −5° C.

16. The elastomeric latex of claim 1 , wherein the latex has a glass transition temperature less than −9° C.

17. A coating composition, comprising the latex of claim 1 .

18. A substrate coated with the coating composition of claim 17 .

19. The elastomeric latex of claim 12 , wherein the aromatic ketone comprises benzophenone and its derivatives, isopropylthioxantone, hydroxyalkylphenone, benzildimethylketal, alkyl-benzoin ethers, acetophenone, or combinations thereof.