Additive mixture

Abstract

An additive mixture containing (A) at least one compound of the formula (I) wherein R.sub.1 and R.sub.2 independently of one another are hydrogen, C.sub.1-C.sub.22alkyl, O, OH, CH2CN, C.sub.1-C.sub.18alkoxy, C.sub.2-C.sub.18alkoxy substituted by OH; C.sub.5-C.sub.12cycloalkoxy, C.sub.3-C.sub.6alkenyl, C.sub.3-C.sub.6alkenyloxy, C.sub.7-C.sub.9phenylalkyl unsubstituted or substituted on the phenyl by 1, 2 or 3 C.sub.1-C.sub.4alkyl; or C.sub.1-C.sub.8acyl; and R.sub.3 and R.sub.4 independently of one another are C.sub.1-C.sub.22alkyl or a group of the formula (Ia) wherein R.sub.0 has one of the meanings of R.sub.1 and R.sub.2, and (B) at least one anti-scratch additive. ##STR00001##

Claims

1. An additive mixture, comprising: (A) a compound of formula (I) ##STR00010## wherein R.sub.1 and R.sub.2 are independently hydrogen, C.sub.1-C.sub.22alkyl, O, OH, CH.sub.2CN, C.sub.1-C.sub.8acyl, C.sub.1-C.sub.18alkoxy, C.sub.2-C.sub.18alkoxy substituted by OH, by C.sub.5-C.sub.12cycloalkoxy, C.sub.3-C.sub.6alkenyl, C.sub.3-C.sub.6alkenyloxy, or C.sub.7-C.sub.9phenylalkyl optionally substituted on the phenyl by 1, 2, or 3 C.sub.1-C.sub.4alkyl; and R.sub.3 and R.sub.4 are independently C.sub.1-C.sub.22alkyl or a group of formula (Ia) ##STR00011## wherein R.sub.0 has one of the meanings of R.sub.1 and R.sub.2, and (B) an anti-scratch additive comprising erucamide, oleamide, and/or stearamide.

2. The additive mixture of claim 1, wherein R.sub.1 and R.sub.2 are independently hydrogen, C.sub.1-C.sub.8alkyl C.sub.1-C.sub.18alkoxy, or cyclohexyloxy; and wherein R.sub.3 and R.sub.4 are independently of a C.sub.1-C.sub.6alkyl.

3. The additive mixture of claim 1, wherein the compound of the formula (I) is ##STR00012##

4. The additive mixture of claim 1, wherein the anti-scratch additive is erucamide.

5. A composition, comprising: an organic material susceptible to degradation induced by light, heat, or oxidation; and the additive mixture of claim 1.

6. The composition of claim 5, wherein the organic material is a polyolefin, an acrylonitrile/butadiene/styrene, a polyvinyl chloride, a polymethylmethacrylate, a polyamide, or a polyoxymethylene.

7. The composition of claim 5, wherein the organic material is a thermoplastic polyolefin.

8. The composition of claim 5, further comprising: a phenolic antioxidant and/or a phenolic phosphite.

9. The composition of claim 8, wherein the phenolic antioxidant is present and is pentaerythritol tetrakis[3,5-di-tert-butyl-4-hydroxyphenylpropionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)proprionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, N,N-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylene-diamide, 1,3,5-tris[3,5-di-tert-butyl-4-hydroxybenzyl]isocyanurate, 2,4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, or bis(1,2,2,6,6-pentamethylpiperidin-4-yl)-butyl(3,5-di-t-butyl-4-hydroxybenzyl)malonate.

10. The composition of claim 5, further comprising: a sterically hindered amine light stabilizer different from the compound of the formula (I); and/or a UV-absorber.

11. The composition of claim 10, wherein the UV-absorber is selected from the group consisting of 2-(2-hydroxyphenyl)benzotriazoles, 2-hydroxybenzophenones, oxamides, and 2-(2-hydroxyphenyl)-1,3,5-triazines.

12. The composition of claim 5, further comprising: a filler and/or a pigment.

13. An article, comprising: the composition of claim 5.

14. The article of claim 13, which is an automotive interior or exterior trim material.

15. A method for stabilizing an organic material against degradation induced by light, heat, or oxidation, the method comprising: incorporating into the organic material the additive mixture of claim 1.

16. The additive mixture of claim 1, wherein, in the compound of the formula (I), R.sub.1 and/or R.sub.2 is independently a substituted C.sub.7-C.sub.9phenylalkyl.

17. The composition of claim 5, wherein the organic material is polypropylene.

18. The composition of claim 5, further comprising: tris[2,4-di-tert-butylphenyl]phosphite.

19. The additive mixture of claim 1, wherein the anti-scratch additive is oleamide.

20. The additive mixture of claim 1, wherein the anti-scratch additive is stearamide.

Description

EXAMPLE 1

(1) Base Formulation:

(2) 78.3% by weight of thermoplastic polyolefin (Daplen EE013 AE of Borealis; Melt Flow Rate: 11 g/10 min (ISO 1133); Density: 905 kg/m.sup.3 (ISO 1183)),

(3) 20% by weight of talc,

(4) 1.5% by weight of carbon black,

(5) 0.1% by weight of tris(2,4-di-tert-butylphenyl)phosphite,

(6) 0.05% by weight of calcium stearate

(7) and

(8) 0.05% by weight of pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate).

(9) Further additives, as outlined below, are incorporated with the same method as for the base formulation. In every case, the percentage by weight of the thermoplastic polyolefin is adjusted to have the sum of all ingredients giving 100%.

(10) Preparation of the Tested Specimen:

(11) The base formulation is pre-mixed in a high-speed mixer. This mixture is combined with the further additives listed in Tables 1 to 3 in a high-speed mixer and then compounded in a twin-screw extruder Berstorff ZE 2532D at 230 C. The full formulation is then injection molded on an Engel HL65 injection molding machine. The injection molded plaques (60 mm60 mm2 mm) are exposed to artificial weathering according to the international norm DIN EN ISO 105-B06 (Xenon light, irradiance 1.20 W/(m.sup.2 nm) @ 420 nm, dry bulb temperature 65 C., relative humidity 30%+/5%). The parameters measured are color deviation (gray scale and Delta E*) and gloss at 60. The results are listed in Tables 1, 2 and 3.

(12) TABLE-US-00001 TABLE 1 Gray scale (High values are desired.) Hours exposure 0 303 602 Base formulation 5.00 4.62 2.25 Base formulation + 0.2% 5.00 4.81 4.58 Compound (A) + 0.4% erucamide

(13) TABLE-US-00002 TABLE 2 Delta E (Low values are desired.) Hours exposure 0 303 602 1110 1997 2977 Base formulation 0.00 0.65 5.71 Base formulation + 0..00 0.27 0.50 0.53 0.78 2.53 0.2% Compound (A) Base formulation + 0.00 0.18 0.19 0.61 9.07 17.84 0.4% erucamide Base formulation + 0.00 0.32 0.72 0.97 1.02 1.21 0.2% Compound (A) + 0.4% erucamide

(14) TABLE-US-00003 TABLE 3 Gloss at 60 (High values are desired.) Hours exposure 0 303 602 1110 1997 2977 5467 Base formulation 26.90 9.80 4.00 Base formulation + 28.50 20.50 21.10 19.00 19.30 19.00 5.50 0.2% Compound (A) Base formulation + 43.00 23.90 22.40 10.30 0.30 0.20 0.4% erucamide Base formulation + 33.50 20.40 19.00 18.10 15.90 16.50 11.20 0.2% Compound (A) + 0.4% erucamide

(15) The results shown above clearly reveal that the combination of Compound (A) plus erucamide provides a better retention of the properties of the tested thermoplastic polyolefin and better scratch resistance than Compound (A) or erucamide alone.

EXAMPLE 2

(16) The injection molded plaques which are prepared as described in Example 1 are exposed to artificial weathering (Xenon light, irradiance 40 W/m2 @ 300-400 nm, dry bulb temperature 45 C., relative humidity 20%+/10%). The tackiness of the surface of the exposed samples is assessed after several durations of exposure and rated according to the scale shown below:

(17) 1 No tackiness

(18) 2 Light exuding but no tackiness

(19) 3 Light tackiness

(20) 4 Tackiness

(21) 5 Strong tackiness

(22) 6 Gummy surface

(23) 7 Waxy surface

(24) The results are listed in Table 4.

(25) TABLE-US-00004 TABLE 4 Tackiness (Low values are desired.) Hours exposure 153 300 450 600 750 894 1060 1200 1528 2026 Base formulation + 1.0 1.0 1.0 1.0 1.0 1.5 2.0 2.0 2.0 2.0 0.2% Compound (A) + 0.4% erucamide

(26) This example shows that the combination of Compound (A) plus erucamide provides a surface which shows no tackiness over the exposure time.

EXAMPLE 3

(27) Injection molded plaques which are prepared in analogy to Example 1 are placed in a hot air oven with forced air convection heating at 150 C. The samples are inspected periodically. The criteria is embrittlement, assessed by visual inspection. The results are listed in Table 5.

(28) TABLE-US-00005 TABLE 5 Long-term thermal stability (High values are desired.) Days to embrittlement Base formulation + 0.2% Compound A + 0.4% 46 erucamide

(29) This example shows that the additive mixture of Compound (A)+erucamide provides the base formulation with a long-term thermal stability.