Stabilizer composition for halogen-containing polymers

1. A stabilizer composition for halogen-containing polymers comprising titanium dioxide and at least one nitrogen-containing compound, wherein the titanium dioxide has a photo-electromotive force (photo-EMK) in the μs-range >−15 mV and a photo-electromotive force in the ms-range >+5 mV, wherein the nitrogen-containing compound is selected from the group consisting of a heterocyclic compound, an amine and an aminocrotonic acid ester, wherein the heterocyclic compound is selected from the group consisting of substituted or unsubstituted uracil, pyrimidone and indole and wherein the aminocrotonic acid ester has the general formula (III)

wherein R 5 is H, C 1 -C 18 alkyl, C 2 -C 6 alkenyl, C 1 -C 4 alkoxy, C 5 -C 8 cycloalkyl or C 5 -C 10 aryl, or wherein R 5 is selected in such a way that a symmetrical aminocrotonic acid ester is formed.

2. The stabilizer composition according to claim 1 , wherein the titanium dioxide has a photo-electromotive force in the μs-range >−10 mV and a photo-electromotive force in the ms-range >+10 mV.

3. The stabilizer composition according to claim 1 , wherein the uracil has the following formula (I)

wherein R 1 , R 2 , R 3 and R 4 are independently H, C 1 -C 18 alkyl, C 2 -C 6 alkenyl, C 1 -C 4 alkoxy, C 5 -C 8 cycloalkyl, C 5 -C 10 aryl, wherein R 3 and R 4 are independently NHR 5 , wherein R 5 is, independently to R 1 or R 2 , H, C 1 -C 18 alkyl, C 2 -C 6 alkenyl, C 1 -C 4 alkoxy, C 5 -C 8 cycloalkyl, C 5 -C 10 aryl.

4. The stabilizer composition according to claim 1 , wherein the nitrogen compound has the following formula (II)

wherein R 1 , R 2 and R 3 are independently H, C 1 -C 18 alkyl, C 2 -C 6 alkenyl, C 1 -C 4 alkoxy, C 5 -C 8 cycloalkyl, C 5 -C 10 aryl.

5. The stabilizer composition according to claim 1 , wherein the aminocrotonic acid ester is butyleneglycolaminocrotonate or thioethyleneglycolaminocrotonate.

6. The stabilizer composition according to claim 3 , wherein the uracil is 1,3-dimethyl-4-aminouracil.

7. The stabilizer composition according to claim 1 , wherein the titanium dioxide is present in an amount of about 0.05 to about 15.0 per 100 parts resin (phr).

8. The stabilizer composition according to claim 7 , wherein the titanium dioxide is present in an amount of about 0.1 to about 10.0 phr.

9. The stabilizer composition according to claim 1 , further comprising at least one co-stabilizer.

10. The stabilizer composition according to claim 1 , further comprising primary stabilizers, zeolites, antioxidants, fillers, softeners, dyes, pigments, antistatic agents, surface-active agents, foaming agents, impact modifiers and/or UV stabilizers.

11. The stabilizer composition according to claim 1 , wherein the titanium dioxide has rutile or anatase structure.

12. The stabilizer composition according to claim 1 , wherein the halogen-containing polymer is PVC.

13. The stabilizer composition according to claim 1 , wherein the photo-EMK is measured by a method comprising:

clamping the sample between a front and a back electrode;

irradiating the sample with a short light flash, wherein the wavelength of the excitation flash is 337 nm and the pulse duration is 0.3 ns;

measuring the voltage with a high impedance voltmeter.

14. A method for stabilizing halogen-containing polymers comprising:

providing a halogen-containing polymer; and

contacting the halogen-containing polymer with a stabilizer composition according to claim 1 for stabilizing the halogen-containing polymers.

15. The method according to claim 14 , wherein the stabilization is against effect of light.

16. The method according to claim 14 , wherein the halogen-containing polymer is PVC.

17. Moulding comprising a halogen-containing polymer comprising a stabilizer composition according to claim 1 .

18. Moulding of halogen-containing polymer comprising a stabilizer composition according to claim 1 .

19. Moulding according to claim 17 , wherein the moulding is window profiles, pipes, floor coverings, roof sheets, cables and films.