Solar control coating with discontinuous metal layer

1. A coated transparency, comprising:

a glass substrate; and

a solar control coating over at least a portion of the glass substrate, the coating comprising:

a first dielectric layer formed over at least a portion of the glass substrate;

a first metallic layer over the first dielectric layer;

a second dielectric layer over the first metallic layer;

a second metallic layer over the second dielectric layer;

a third dielectric layer over the second metallic layer;

a third metallic layer over the third dielectric layer; and

a fourth dielectric layer over the third metallic layer,

wherein at least one of the metallic layers is a discontinuous metallic layer,

wherein the coated transparency has a solar heat gain coefficient (SHGC) of less than 0.3,

wherein the coated transparency can be tempered or heat treated without adversely impacting the performance characteristics of the coated transparency and/or producing haze therein, and

wherein the coated transparency is an automotive transparency or an architectural transparency.

2. The transparency of claim 1 , wherein the at least one discontinuous metallic layer has an effective thickness of less than 50 Å.

3. The transparency of claim 1 , wherein the first dielectric layer, the second dielectric layer, the third dielectric layer, or the fourth dielectric layer comprise a first film and a second film deposited over the first film.

4. The transparency of claim 1 , wherein at least one of the second dielectric layer and third dielectric layer comprise a first film, a second film over the first film, and a third film over the second film.

5. The transparency of claim 1 , wherein the first dielectric layer comprises a metal oxide, an oxide of a metal alloy, a nitride, an oxynitride, or a mixture thereof.

6. The transparency of claim 1 , wherein the first dielectric layer comprises silicon nitride, silicon aluminum nitride, aluminum nitride, zinc oxide, or zinc stannate.

7. The transparency of claim 1 , wherein the at least one discontinuous metallic layer is selected from the group consisting of silver, gold, copper, palladium, and a mixture thereof.

8. The transparency of claim 1 , wherein the second dielectric layer is selected from the group consisting of silicon nitride, silicon aluminum nitride, aluminum nitride, zinc oxide, or zinc stannate.

9. The transparency of claim 1 , further comprising a protective coating over the fourth dielectric layer.

10. The transparency of claim 9 , wherein the protective coating comprises titania.

11. A coated transparency, comprising:

a glass substrate; and

a solar control coating over at least a portion of the glass substrate, the coating comprising:

a first dielectric layer formed over at least a portion of the glass substrate;

a first continuous metallic layer over the first dielectric layer;

a first primer layer over the first continuous metallic layer;

a second dielectric layer over the first primer layer;

a second discontinuous metallic layer over the second dielectric layer;

a third dielectric layer over the second discontinuous metallic layer;

a third continuous metallic layer over the third dielectric layer;

a third primer layer over the third continuous metallic layer;

a fourth dielectric layer over the third primer layer; and

a protective coating over the fourth dielectric layer,

wherein the coated transparency has a solar heat gain coefficient (SHGC) of less than 0.3,

wherein the coated transparency can be tempered or heat treated without adversely impacting the performance characteristics of the coated transparency and/or producing haze therein, and

wherein the coated transparency is an automotive transparency or an architectural transparency.

12. The transparency of claim 11 , wherein the second discontinuous metallic layer has an effective thickness of less than 50 Å.

13. The transparency of claim 11 , wherein the first dielectric layer, the second dielectric layer, the third dielectric layer, or the fourth dielectric layer comprise a first film and a second film deposited over the first film.

14. The transparency of claim 11 , wherein at least one of the second dielectric layer and the third dielectric layer comprise a first film, a second film deposited over the first film, and a third film deposited over the second film.

15. The transparency of claim 11 , wherein the first dielectric layer comprises a metal oxide, an oxide of a metal alloy, a nitride, an oxynitride, or mixtures thereof.

16. The transparency of claim 11 , wherein the protective coating comprises titania, silica, alumina, or a mixture thereof.

17. A coated transparency, comprising:

a glass substrate; and

a solar control coating over at least a portion of the glass substrate, the coating comprising:

a first dielectric layer formed over at least a portion of the glass substrate, wherein the first dielectric layer comprises a metal that is an oxide, an oxynitride, or a nitride, wherein the metal is selected from the group consisting of silicon, silicon-aluminum alloy or mixture, zinc, and zinc-tin alloy or mixture;

a first metallic layer over the first dielectric layer, wherein the first metallic layer comprises silver, gold, copper, palladium or a mixture thereof;

a first primer layer over the first metallic layer;

a second dielectric layer over the first primer layer, wherein the second dielectric layer comprises a metal that is an oxide, an oxynitride, or a nitride, wherein the metal is selected from the group consisting of silicon, silicon-aluminum alloy or mixture, zinc, and zinc-tin alloy or mixture;

a second metallic layer over the second dielectric layer, wherein the second metallic layer comprises silver, gold, copper, palladium or a mixture thereof, and wherein the second metallic layer is a discontinuous metallic layer having an effective thickness of less than 50 Å;

a third dielectric layer over the second primer layer, wherein the third dielectric layer comprises a metal that is an oxide, an oxynitride, or a nitride, wherein the metal is selected from the group consisting of silicon, silicon-aluminum alloy or mixture, zinc, and zinc-tin alloy or mixture;

a third metallic layer over the third dielectric layer, wherein the third metallic layer comprises silver, gold, copper, palladium or a mixture thereof;

a third primer layer over the third metallic layer; and

a fourth dielectric layer over the third primer layer, wherein the fourth dielectric layer comprises a metal that is an oxide, an oxynitride, or a nitride, wherein the metal is selected from the group consisting of silicon, silicon-aluminum alloy or mixture, zinc, and zinc-tin alloy or mixture,

wherein the coated transparency has a solar heat gain coefficient (SHGC) of less than 0.3,

wherein the coated transparency can be tempered or heat treated without adversely impacting the performance characteristics of the coated transparency and/or producing haze therein, and

wherein the coated transparency is an automotive transparency or an architectural transparency.

18. The transparency of claim 17 , wherein the first dielectric layer comprises zinc oxide.

19. The transparency of claim 17 , further comprising a protective coating over the fourth dielectric layer.

20. The transparency of claim 19 , wherein the protective coating comprises titania, silica, alumina, or a mixture thereof.