Optical article comprising an electrically conductive layer, and production method

1. A curable antistatic primer composition comprising:

at least one polyalkylene oxide polymer;

at least a lithium salt; and

at least an amorphizer comprising at least a dendritic polymer wherein the composition is further defined as having a weight ratio of (dry extract of said dendritic polymer)/(dry extract of said polyalkylene oxide polymer) ranging from 0.05 to 1.5.

2. The curable composition of claim 1 , wherein the dendritic polymer is a hyperbranched polymer or a dendrimer having hydroxyl group at terminal ends thereof.

3. The curable composition of claim 2 , wherein the dendritic polymer has a degree of hydroxyl functionality from 5 to 60.

4. The curable composition of claim 1 , wherein the dendritic polymer has a number average molecular weight Mn ranging from 500 to 5000 g/mol.

5. The curable composition of claim 4 , wherein the dendritic polymer has a number average molecular weight Mn ranging from 1000 to 3000 g/mol.

6. The curable composition of claim 1 , wherein the dendritic polymer is a dendritic polyether or dendritic polyester.

7. The curable composition of claim 6 , wherein the dendritic polymer is a dendritic polyether or dendritic polyester, comprising branching units further defined as 2,2-bis(methylol)propionic acid, 2,2-bis(methylol)butanoic acid, and/or a mixture thereof.

8. The curable composition of claim 1 , wherein the polyalkylene oxide polymer has a number average molecular weight Mn ranging from 200 to 1000 g/mol.

9. The curable composition of claim 1 , wherein the polyalkylene oxide polymer is polyethylene oxide, polypropylene oxide, polybutylene oxide, or a mixture thereof.

10. The curable composition of claim 1 , further comprising a polyisocyanate which is able to form a polyurethane compound with at least the polyalkylene oxide polymer.

11. The curable composition of claim 10 , wherein the polyisocyanate is 1,6-hexamethylene diisocyanate.

12. The curable composition of claim 10 , comprising, by weight, relative to the total weight of the curable coating composition:

from 40% to 60% by weight of the polyalkylene oxide polymer;

from 5% to 15% by weight of lithium salts;

from 25% to 40% by weight of polyisocyanate; and

from 5% to 20% by weight of dendritric polymer.

13. The curable composition of claim 12 , comprising, relative to the total weight of the curable coating composition:

from 40% to 50% by weight of the polyalkylene oxide polymer.

14. The curable composition of claim 12 , further comprising:

from 10% to 25% by dry content weight of a solvent.

15. A process of preparation of a curable antistatic primer composition as defined in claim 10 , comprising:

mixing at least one polyalkylene oxide polymer with a dendritic polymer previously dried;

adding and stirring to said mixture lithium salts; and

adding a polyisocyanate.

16. The process of claim 15 , further comprising adding and mixing a catalyst and a surfactant.

17. An optical article having at least one surface on which an antistatic primer coating is obtained by depositing on a substrate and curing a curable antistatic primer composition of claim 1 .

18. The optical article of claim 17 , further defined as an ophthalmic lens.

19. A process for forming an antistatic coating onto a substrate of an optical article, said substrate having at least one face, comprising:

preparing a curable antistatic primer composition of claim 1 ;

coating the substrate with said curable antistatic primer composition; and

curing said curable antistatic primer composition.

20. A curable antistatic primer composition comprising:

at least one polyalkylene oxide polymer;

at least a lithium salt; and

at least an amorphizer comprising at least a dendritic polymer:

wherein the dendritic polymer is a hyperbranched polymer or a dendrimer having hydroxyl group at terminal ends thereof, and wherein the dendritic polymer has a degree of hydroxyl functionality from 5 to 60.

21. The curable composition of claim 20 , further comprising a polyisocyanate which is able to form a polyurethane compound with at least the polyalkylene oxide polymer.

22. The curable composition of claim 21 , comprising, by weight, relative to the total weight of the curable coating composition:

from 40% to 60% by weight of the polyalkylene oxide polymer;

from 5% to 15% by weight of lithium salts;

from 25% to 40% by weight of polyisocyanate; and

from 5% to 20% by weight of dendritric polymer.

23. The curable composition of claim 22 , further comprising:

from 10% to 25% by dry content weight of a solvent.