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 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.

2. An article according to claim 1, wherein component A) is at least one compound of the formula (A-I), (A-II) or (A-III) ##STR00027## wherein A.sub.11 is C.sub.2-C.sub.18alkylene, C.sub.5-C.sub.7cycloalkylene or C.sub.1-C.sub.4alkylenedi(C.sub.5-C.sub.7cycloalkylene), the radical A.sub.12 is hydrogen, C.sub.1-C.sub.12alkyl or C.sub.5-C.sub.12cycloalkyl, A.sub.13 and A.sub.14 independently of one another are hydrogen, C.sub.1-C.sub.12alkyl, C.sub.5-C.sub.12cycloalkyl or a group of the formula (a-1), ##STR00028## or the radicals A.sub.13 and A.sub.14, together with the nitrogen atom to which they are bonded, form a 5- to 10-membered heterocyclic ring and a.sub.1 is a number from 1 to 20, and the repeating units are identical or different; ##STR00029## wherein A.sub.21 and A.sub.25 independently of one another are hydrogen, C.sub.1-C.sub.12alkyl, C.sub.5-C.sub.12cycloalkyl or a group of the formula (a-1), A.sub.22, A.sub.23 and A.sub.24 independently of one another are C.sub.2-C.sub.10alkylene, and X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7 and X.sub.8 independently of one another are a group of the formula (a-2), ##STR00030## in which A.sub.26 is hydrogen, C.sub.1-C.sub.12alkyl, C.sub.5-C.sub.12cycloalkyl or a group of the formula (a-1) as defined above, and A.sub.27 has one of the meanings of A.sub.12; ##STR00031## wherein R.sub.1 and R.sub.2 independently of one another are hydrogen, C.sub.1-C.sub.22alkyl, —O.sup.−, —OH, —CH.sub.2CN, 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 (a-3) ##STR00032## wherein R.sub.0 has one of the meanings of R.sub.1 and R.sub.2.

3. An article according to claim 2, wherein A.sub.11 is C.sub.2-C.sub.10alkylene, the radical A.sub.12 is hydrogen, C.sub.1-C.sub.4alkyl or cyclohexyl, A.sub.13 and A.sub.14 independently of one another are hydrogen, C.sub.1-C.sub.4alkyl, cyclohexyl or a group of the formula (a-1), ##STR00033## or the radicals A.sub.13 and A.sub.14, together with the nitrogen atom to which they are bonded, form a morpholino group and a.sub.1 is a number from 1 to 10, and the repeating units are identical or different; A.sub.21 and A.sub.25 independently of one another are hydrogen, C.sub.1-C.sub.4alkyl or cyclohexyl, A.sub.22, A.sub.23 and A.sub.24 independently of one another are C.sub.2-C.sub.10alkylene, and X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7 and X.sub.8 independently of one another are a group of the formula (a-2), ##STR00034## in which A.sub.26 is hydrogen, C.sub.1-C.sub.4alkyl, cyclohexyl or a group of the formula (a-1) as defined above, and A.sub.27 has one of the meanings of A.sub.12; R.sub.1 and R.sub.2 independently of one another are hydrogen, C.sub.1-C.sub.4alkyl or cyclohexyl; and R.sub.3 and R.sub.4 independently of one another are C.sub.1-C.sub.22alkyl.

4. An article according to claim 1, wherein component A) is a compound of the formula (A-I-1), (A-I-2), (A-II-1) or (A-III-1), ##STR00035## with a.sub.1 being 2 to 10, ##STR00036## with a.sub.1 being 2 to 10, ##STR00037## wherein X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, X.sub.6, X.sub.7 and X.sub.8 are the group ##STR00038## wherein R.sub.3 and R.sub.4 are C.sub.1-C.sub.22alkyl.

5. An article according to claim 1, wherein Component B) has a mean particle size of 0.2 to 10 micrometres.

6. An article according to claim 1, further comprising a component C) which is 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, ethylene bis[3,3-bis (3-tert-butyl-4-hydroxyphenyl) butyrate] or 1,3,5-tris (3,5-di-tertbutyl-4-hydroxybenzyl)-isocyanurate.

7. An article according to claim 1, further comprising a component D) which is tris(2,4-di-tert-butylphenyl) phosphite, [3,3′,5,5′-tetra-tert. butyl-1,1′biphenyl-2,2′-diyl]-[3-(3-methyl-4-hydroxy-5-tert.butyl-phenyl)-propyl]-phosphite, [2,2′-ethylene-bis-(4,6-di-tert. butyl-phenyl)-1,1′-diyl]-[1,6-dimethyl-4-(5,7-di-tert. butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite, [2,2′-ethylene-bis-(4,6-di-tert. butyl-phenyl)-1,1′-diyl]-[1-methyl-6-tert. butyl-4-(5,7-di-tert. butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite, 6-[3-(3-tertbutyl-4-hydroxy-5-methylphenyl) propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f] [1,3,2]dioxaphosphepin, α-tocopherol, β-tocopherol, γ-tocopherol, δ-tocopherol, dioctadecylhydroxylamine or N,N-dialkylhydroxylamine derived from hydrogenated tallow amine.

8. An article according to claim 1, comprising as component (A) the compound of formula (A-I-1) ##STR00039## with a.sub.1 being 2 to 10, as component (C) 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, and as component (D) tris[2,4-di-tert-butylphenyl]phosphite.

9. An article according to claim 1, further comprising a hydrotalcite.

10. An article according to claim 1, wherein the weight ratio of component A) to component B) is 1:10 to 10:1.

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

12. An article according to claim 11, which is in contact with oxidizing media.

13. An article according to claim 1, which is in the form of a pipe.

14. An article according to claim 13, which is in contact with chlorinated water.

15. An article according to claim 1 comprising polyethylene.

16. An article according to claim 2, wherein at is a number from 2 to 20.

17. An article according to claim 3, wherein at is a number from 2 to 20.

Description

EXAMPLES 1 TO 13

[0142] Preparation of the test specimens: A mixture of a non-stabilised high density polyethylene (HD-PE; Hostalen®CRP-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.

[0143] The obtained full formulation is then compounded on a Collin 25×42D extruder at 240° C. and then injection molded on an Engel HL65 injection molding machine at 230° C.

[0144] For the injection molded plaques of 40 mm×60 mm×2 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.

TABLE-US-00001 TABLE 1 OIT Results/ Additive Formulation Minutes Comparative 0.3% of Irganox ®1330 + 50 Example 1 0.1% of Irgafos ®168 Comparative 0.3% of Irganox ®1330 + 0.1% 50 Example 2 of Irgafos ®168 plus 0.2% of Hycite ®713 Comparative 0.3% of Irganox ®1330 + 0.1% 50 Example 3 of Irgafos ®168 plus 0.2% of Kisuma 10A Comparative 0.3% of Irganox ®1330 + 0.1% 130 Example 4 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 Example 5 0.3% of Irganox ®1330 + 0.1% 170 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.2% of Kisuma 10A Example 6 0.3% of Irganox ®1330 + 0.1% 450 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.4% of Kisuma 10A Example 7 0.3% of Irganox ®1330 + 0.1% 280 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.1% of Kisuma 10A + 0.1% of Hycite ®713 Example 8 0.3% of Irganox ®1330 + 0.1% 600 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.2% of Kisuma 10A + 0.2% of Hycite ®713 Example 9 0.3% of Irganox ®1330 + 0.1% 620 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.3% of Kisuma 10A + 0.3% of Hycite ®713 Example 10 0.3% of Irganox ®1330 + 0.1% 190 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.2% of Magnifin H-5 IV Example 11 0.3% of Irganox ®1330 + 0.1% 395 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.4% of Magnifin H-5 IV Example 12 0.3% of Irganox ®1330 + 0.1% 529 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.6% of Magnifin H-5 IV Example 13 0.3% of Irganox ®1330 + 0.1% 360 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.2% of Magnifin H-5 IV + 0.2% of Hycite ®713 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

[0145] 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.

[0146] The obtained full formulation is then compounded on a Collin ZK25E×42D extruder at 230° C. and then injection molded on an Arburg Allrounder Selecta 320 S 500-150 injection molding machine at 230° C.

[0147] For the injection molded plaques of 44 mm×68 mm×2 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.

TABLE-US-00002 TABLE 2 OIT Results/ Additive Formulation Minutes Comparative 0.3% of Irganox ®1330 + 149 Example 14 0.1% of Irgafos ®168 Example 15 0.3% of Irganox ®1330 + 0.1% 282 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.2% of Kisuma 10A Example 16 0.3% of Irganox ®1330 + 0.1% 321 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.4% of Kisuma 10A Example 17 0.3% of Irganox ®1330 + 0.1% 304 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.1% of Kisuma 10A + 0.1% of Hycite ®713 Example 18 0.3% of Irganox ®1330 + 0.1% 395 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.2% of Kisuma 10A + 0.2% of Hycite ®713 Example 19 0.3% of Irganox ®1330 + 0.1% 346 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 0.2% of Magnifin H-5 IV Example 20 0.3% of Irganox ®1330 + 0.1% 390 of Irgafos ®168 plus 0.2% of Chimassorb ®2020 + 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.