Composition that can be screen printed onto polyvinyl butyral

1. A composition suitable for the black printing, via screen printing, of a sheet of polyvinyl butyral, wherein the composition comprises:

from 3% to 5% by weight of cyclohexanone;

from 11% to 13% by weight of polyvinyl butyral;

from 35% to 40% by weight of at least one aliphatic dicarboxylic acid diester;

an effective amount of a surface tension modifier that does not contain silicone; and

at least one black pigment in an amount and with a specific surface area such that the Brookfield viscosity of the composition at 20° C. is between 9 and 13 Pa·s,

wherein the surface tension modifier is a polyacrylate.

2. The composition of claim 1 , wherein the polyvinyl butyral contained in the composition has a molecular weight evaluated by gel permeation chromatography centered about a value at most equal to 90 000 in polystyrene equivalents.

3. The composition of claim 1 , wherein the polyvinyl butyral contained in the composition has a molecular weight evaluated by gel permeation chromatography centered about a value at least equal to 20 000 in polystyrene equivalents.

4. The composition of claim 1 , wherein the [OH] content of the polyvinyl butyral contained in the composition corresponds to a weight percentage of poly(vinyl alcohol) between 17% and 22%.

5. The composition of claim 1 , wherein said at least one aliphatic dicarboxylic acid diester is a succinate, a glutarate, or an adipate.

6. The composition of claim 1 , wherein said at least one black pigment is a mixture of carbon black and black iron oxide.

7. The composition of claim 1 , further comprising:

an effective amount of plasticizer as wetting agent.

8. The composition of claim 1 , wherein said at least one black pigment is a mixture of carbon black and black iron oxide, and the composition comprises:

from 8% to 12% by weight of carbon black; and

from 28% to 32% by weight of black iron oxide.

9. The composition of claim 8 , wherein the aliphatic dicarboxylic acid diester is a mixture of a succinate, a glutarate, and an adipate.

10. A process for printing, via screen printing, a sheet of polyvinyl butyral, the process comprising:

applying the composition of claim 1 to the sheet of polyvinyl butyral, through a screen-printing screen.

11. The process of claim 10 , wherein a thickness of a wet layer of composition applied to the polyvinyl butyral sheet is between 10 and 50 μm.

12. A composition suitable for the black printing, via screen printing, of a sheet of polyvinyl butyral, wherein the composition comprises:

from 5% to 10% by weight of at least one plasticizer selected from group consisting of a benzoate ester, a phthalate, an adipate, a fatty acid ester, a trioctyl trimellitate, a triacetin, a glycerol, a propylene glycol, a sorbitol, and a trimethylpentanediol diisobutyrate;

from 11% to 13% by weight of polyvinyl butyral;

from 35% to 40% by weight of at least one aliphatic dicarboxylic acid diester;

an effective amount of a surface tension modifier that does not contain silicone; and

at least one black pigment in an amount and with a specific surface area such that the Brookfield viscosity of the composition at 20° C. is between 9 and 13 Pa·s,

wherein the surface tension modifier is a polyacrylate.

13. The composition of claim 12 , wherein the plasticizer is dimethylcyclohexyl phthalate.

14. The composition of claim 12 , wherein the polyvinyl butyral contained in the composition has a molecular weight evaluated by gel permeation chromatography centered about a value of a least equal to 20 000 and at most equal to 90 000 in polystyrene equivalents.

15. The composition of claim 12 , wherein the [OH] content of the polyvinyl butyral contained in the composition corresponds to a weight percentage of poly(vinyl alcohol) between 17% and 22%.

16. The composition of claim 12 , wherein said at least one aliphatic dicarboxylic acid diester is a succinate, a glutarate, or an adipate.

17. The composition of claim 12 , wherein said at least one black pigment is a mixture of carbon black and black iron oxide.

18. A composition suitable for the black printing, via screen printing, of a sheet of polyvinyl butyral, wherein the composition consists of:

from 11% to 13% by weight of polyvinyl butyral;

from 5% to 10% by weight of a wetting agent;

from 8% to 12% by weight of carbon black;

from 28% to 32% by weight of black iron oxide;

from 35% to 40% by weight of at least one aliphatic dicarboxylic acid diester;

from 3% to 5% by weight of cyclohexanone;

from 0.5% to 2% by weight of a surface tension modifier that does not contain silicone, wherein the surface tension modifier is a polyacrylate; and

wherein the composition has a Brookfield viscosity at 20° C. between 9 and 13 Pa·s.