Polyethylene or polypropylene articles

Abstract

An article in the form of a pipe, cable or geomembrane comprising polyethylene or polypropylene, and components A) and B), wherein component A) is a hindered amine light stabilizer containing a triazine residue, component B) is magnesium hydroxide which is present in an amount of 0.01% to 5% by weight relative to the weight of the polyethylene or polypropylene, and the weight ratio of component A) to component B) is 1:50 to 50:1, with the proviso that component B) is not a hydrotalcite.

Claims

1. An article in the form of a pipe, cable or geomembrane comprising polyethylene and components A), B), C), D), and E), wherein: component A) is a compound of formula (A-I-1): ##STR00027## with a.sub.1 being 2 to 10, component B) is magnesium hydroxide which is present in an amount of 0.05% to 0.3% by weight relative to the weight of the polyethylene, wherein the magnesium hydroxide is natural or synthetic, and wherein the magnesium hydroxide is not surface treated, component C) is 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, component D) is tris[2,4-di-tert-butylphenyl]phosphite, component E) is a hydrotalcite, and a weight ratio of component A) to component B) is 0.7:1 to 2:1, with the proviso that component B) is not a hydrotalcite.

2. The article according to claim 1, wherein component B) has a mean particle size of 0.2 to 10 micrometres.

3. The article according to claim 1, which is in the form of a pipe or geomembrane.

4. The article according to claim 3, which is in contact with oxidizing media.

5. The article according to claim 1, which is in the form of a pipe.

6. The article according to claim 5, which is in contact with chlorinated water.

7. The article according to claim 1 comprising polyethylene.

Description

EXAMPLES 1 TO 13

(1) Preparation of the test specimens: A mixture of a non-stabilised high density polyethylene (HD-PE; HostalenCRP-100; natural classified under PE 100 of LyondellBasell; Melt Flow Rate: 190 C./5.0 Kg: 0.23 g/10 min (ISO 1133); Density: 0.95 g/cm3 (ISO 1183)) and the additives listed in Table 1 is mixed with a Mixaco Lab CM12 high speed mixer device.

(2) The obtained full formulation is then compounded on a Collin 2542D extruder at 240 C. and then injection molded on an Engel HL65 injection molding machine at 230 C.

(3) For the injection molded plaques of 40 mm60 mm2 mm OIT Values (Oxidative Induction Time, DIN EN ISO 11357-6) are measured using a DSC Q2000 of TA Instrument (Waters) at 200 C. under O.sub.2. The results are listed in the following Table 1.

(4) TABLE-US-00001 TABLE 1 OIT Results/ Additive Formulation Minutes Comparative 0.3% of Irganox1330 + 50 Example 1 0.1% of Irgafos168 Comparative 0.3% of Irganox1330 + 0.1% 50 Example 2 of Irgafos168 plus 0.2% of Hycite713 Comparative 0.3% of Irganox1330 + 0.1% 50 Example 3 of Irgafos168 plus 0.2% of Kisuma 10A Comparative 0.3% of Irganox1330 + 0.1% 130 Example 4 of Irgafos168 plus 0.2% of Chimassorb2020 Example 5 0.3% of Irganox1330 + 0.1% 170 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.2% of Kisuma 10A Example 6 0.3% of Irganox1330 + 0.1% 450 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.4% of Kisuma 10A Example 7 0.3% of Irganox1330 + 0.1% 280 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.1% of Kisuma 10A + 0.1% of Hycite713 Example 8 0.3% of Irganox1330 + 0.1% 600 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.2% of Kisuma 10A + 0.2% of Hycite713 Example 9 0.3% of Irganox1330 + 0.1% 620 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.3% of Kisuma 10A + 0.3% of Hycite713 Example 10 0.3% of Irganox1330 + 0.1% 190 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.2% of Magnifin H-5 IV Example 11 0.3% of Irganox1330 + 0.1% 395 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.4% of Magnifin H-5 IV Example 12 0.3% of Irganox1330 + 0.1% 529 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.6% of Magnifin H-5 IV Example 13 0.3% of Irganox1330 + 0.1% 360 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.2% of Magnifin H-5 IV + 0.2% of Hycite713 High OIT-values are desired. The materials as obtained according to Examples 1 to 13 after compounding, are used for the preparation of pipes according to conventional methods.

Examples 14 to 20

(5) Preparation of the test specimens: A mixture of a non-stabilised polypropylene (Moplen HF501N of LyondellBasell) and the additives listed in Table 2 are mixed with a laboratory mixer MTI M 20.

(6) The obtained full formulation is then compounded on a Collin ZK25E42D extruder at 230 C. and then injection molded on an Arburg Allrounder Selecta 320 S 500-150 injection molding machine at 230 C.

(7) For the injection molded plaques of 44 mm68 mm2 mm OIT Values (Oxidative Induction Time, DIN EN ISO 11357-6) are measured using a DSC Q2000 of TA Instrument (Waters) at 180 C. under O.sub.2. The results are listed in the following Table 2.

(8) TABLE-US-00002 TABLE 2 OIT Results/ Additive Formulation Minutes Comparative 0.3% of Irganox1330 + 149 Example 14 0.1% of Irgafos168 Example 15 0.3% of Irganox1330 + 0.1% 282 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.2% of Kisuma 10A Example 16 0.3% of Irganox1330 + 0.1% 321 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.4% of Kisuma 10A Example 17 0.3% of Irganox1330 + 0.1% 304 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.1% of Kisuma 10A + 0.1% of Hycite713 Example 18 0.3% of Irganox1330 + 0.1% 395 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.2% of Kisuma 10A + 0.2% of Hycite713 Example 19 0.3% of Irganox1330 + 0.1% 346 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.2% of Magnifin H-5 IV Example 20 0.3% of Irganox1330 + 0.1% 390 of Irgafos168 plus 0.2% of Chimassorb2020 + 0.4% of Magnifin H-5 IV High OIT-values are desired. The materials as obtained according to Examples 14 to 20 after compounding, are used for the preparation of pipes according to conventional methods.