Silazane-siloxane random copolymers, their production and use

1. A method for producing an electronic device, comprising:

obtaining a silazane-siloxane random copolymer by reacting an organosilane, an amine and an organosiloxane, wherein the organosilane comprises two halogen end groups and the organosiloxane is of formula (II-a)

X 3 −[ SiR 3 R 4 —O —] a SiR 3 R 4 −X 4   (II-a)

and the amine is of formula (III)

NH 2 R 5   (III)

wherein

X 3 and X 4 are at each occurrence independently selected from the group consisting of OH, Cl, Br, I;

R 3 , R 4 and R 5 are at each occurrence independently H or a carbyl group; and

a is an integer of at least 1 and at most 10; and

providing a composition comprising the so-obtained silazane-siloxane random copolymer and applying the composition to a substrate of an electronic device.

2. Method according to claim 1 , wherein the organosilane is of formula (I-a)

X 1 −SiR 1 R 2 −X 2   (I-a)

wherein

R 1 and R 2 are at each occurrence independently H or carbyl; and

X 1 and X 2 are at each occurrence independently selected from the group consisting of Cl, Br, I.

3. Method according to claim 1 , wherein the electronic device is an LED chip and the silazane-siloxane random copolymer is deposited directly onto the LED chip.

4. Method according to claim 1 , wherein said composition further comprises a light emitting material.

5. Method according to claim 4 , wherein the light emitting material is a phosphor.

6. A method for producing an electronic device, comprising:

(a) obtaining a silazane-siloxane random copolymer by reacting an organosilane, ammonia or an amine and an organosiloxane,

(b) providing a composition comprising the so-obtained silazane-siloxane random copolymer, and

(c) subsequently depositing said composition on a substrate of an electronic device.

7. Method according to claim 6 , wherein the silazane-siloxane random copolymer comprises a first monomer unit M l and a second monomer unit M 2 in random sequence, wherein the first monomer unit M 1 is of formula (I) and the second monomer unit M 2 is of formula (II)

—[— SiR 1 R 2 —NR 5 —]—  (I)

—[— SiR 3 R 4 —[— O—SiR 3 R 4 —] a —NR 5 —]—  (II)

wherein

R 1 , R 2 , R 3 , R 4 and R 5 are at each occurrence independently of each other selected from the group consisting of H and carbyl; and

a is an integer of at least 1 and at most 10.

8. Method according to claim 7 , wherein R 1 and R 2 are at each occurrence independently H or alkyl having at least 1 and at most 20 carbon atoms or phenyl.

9. Method according to claim 7 , wherein R 1 and R 2 are independently H or methyl.

10. Method according to claim 7 , wherein R 3 and R 4 are at each occurrence independently H or alkyl having at least 1 and at most 40 carbon atoms or phenyl.

11. Method according to claim 7 , wherein R 3 and R 4 are independently methyl or phenyl.

12. Method according to claim 7 , wherein R 5 is at each occurrence independently H or alkyl having at least 1 and at most 20 carbon atoms or phenyl.

13. Method according to claim 7 , wherein R 5 is at each occurrence independently H or methyl.

14. Method according to claim 6 , wherein the electronic device is an LED chip and the silazane-siloxane random copolymer is deposited directly onto the LED chip.

15. Method according to claim 6 , wherein said composition further comprises a light emitting material.

16. Method according to claim 15 , wherein the light emitting material is a phosphor.

17. Method according to claim 7 , wherein: R 1 and R 2 are at each occurrence independently H or alkyl having at least 1 and at most 20 carbon atoms or phenyl; R 3 and R 4 are at each occurrence independently H or alkyl having at least 1 and at most 40 carbon atoms or phenyl; and R 5 is at each occurrence independently H or alkyl having at least 1 and at most 20 carbon atoms or phenyl.