POLYOLEFIN COMPOSITIONS

Abstract

The present invention relates to a polyolefin composition comprising (a) a hindered amine light stabilizer of formula (1) as defined herein, (b) a hydrotalcite or an inorganic oxide, and (c) a hydroxylamine stabilizer or an amine oxide stabilizer, a flame retardant article comprising such composition, and to the use of components (b) and (c) for reducing odor in a polyolefin composition comprising a component (a).

Claims

1. A polyolefin composition comprising (a) a compound of formula ##STR00009## wherein R.sub.1 and R.sub.2 are a group of formula ##STR00010## and one of R.sub.3 and R.sub.4 is hydrogen and the remaining one of R.sub.3 and R.sub.4 is a group of formula (2), (b) a hydrotalcite or an inorganic oxide, or mixtures thereof, and (c) a hydroxylamine stabilizer or amine oxide stabilizer.

2. A composition according to claim 1, wherein component (b) is a magnesium aluminum hydroxide carbonate hydrate or zinc aluminum hydroxide carbonate hydrate.

3. A composition according to claim 2, wherein component (b) is a magnesium aluminum hydroxide carbonate hydrate.

4. A composition according to claim 1, wherein component (b) is calcium oxide, magnesium oxide or zinc oxide.

5. A composition according to claim 4, wherein component (b) is calcium oxide.

6. A composition according to claim 1, wherein component (c) is a compound of formula ##STR00011## wherein R.sub.7 and R.sub.8 independently of each other, are C.sub.1-C.sub.30 alkyl or benzyl.

7. A composition according to claim 6, wherein R.sub.7 and R.sub.8, independently of each other, are C.sub.16-C.sub.18alkyl.

8. A composition according to claim 1, wherein component (c) is a compound of formula ##STR00012## wherein R.sub.5 and R.sub.6, independently of each other, are C1-C.sub.30 alkyl

9. A composition according to claim 8, wherein R.sub.5 and R.sub.6, independently of each other, are C.sub.8-C.sub.30 alkyl.

10. A composition according to claim 1, wherein the weight ratio of component (a) to component (b) is 500:1 to 1:1.

11. A composition according to claim 1, wherein the weight ratio of component (a) to component (c) is 500:1 to 1:1.

12. A composition according to claim 1, wherein 0.01 to 50 weight-% of component (a) are used, based on the weight of the composition.

13. A composition according to claim 1, wherein the polyolefin is polyethylene or polypropylene or a copolymer thereof.

14. A composition according to claim 13, wherein the polyolefin is polypropylene or a copolymer thereof.

15. A method of making a composition comprising mixing a polyolefin and components (a), (b) and (c) as defined in claim 1.

16. A flame-retardant article comprising a composition as defined in claim 1.

Description

EXAMPLES

Examples 1 to 9

[0119] A) Components Used Polypropylene Polymer: Moplen HP552R, manufacturer LyondellBasell Industries N.V.

[0120] Component (a1): Compound of formula (1), available as Flamestab® NOR 116 FF, manufacturer BASF SE.

[0121] Component (b1): Magnesium aluminium hydroxide carbonate hydrate, available as DHT-4V® from Kisuma Chemicals B.V..

[0122] Component (b2): Calcium oxide (available as Kezadol DAB from Kettlitz-Chemie GmbH & Co. KG).

[0123] Component (c1): N,N-Dioctadecylhydroxylamine, available as Irgastab® FS 042 from BASF SE.

[0124] Component (c2): N-methyl dioctadecyl amine oxide

[0125] B) Preparation of Pellets and Tests

[0126] Polypropylene Polymer Moplen HP552R (in the following designated as PP) and the respective components given in the following Table 1 are dry blended in the amounts as indicated in Table 1 and then melt compounded into pellets on a DSM Twin-screw Micro-Compounder R at a temperature T.sub.max of 230° C.

[0127] The butyric acid, source of generated odor, is evaluated in each of the produced pelletized compositions according to a thermal desorption GC-MS method.

[0128] According to the thermal desorption GC-MS method the butyric acid is extracted by thermal desorption from the specimen pellet and subsequently quantified by GC-MS analysis.

[0129] The results obtained are given in the following Table 1.

TABLE-US-00001 TABLE 1 Composition Butyric acid Example (in weight-%) (in ppm) 1 (comparative) 80% PP + 20.0% (a1) 596 2 (comparative) 80% PP + 18.7% (a1) + 75 1.3% (b1) 3 (comparative) 80% PP + 18.7% (a1) + 65 1.3% (b2) 4 (comparative) 80% PP + 18.7% (a1) + 465 1.3% (c1) 5 (according to invention) 80% PP + 18.7% (a1) + 42 0.6% (b1) + 0.7% (c1) 6 (according to invention) 80% PP + 18.7% (a1) + 15 0.6% (b2) + 0.7% (c1) 7 (comparative) 80% PP + 18.7% (a1) + 591 1.3% (c2) 8 (according to invention) 80% PP + 18.7% (a1) + 16 0.6% (b1) + 0.7% (c2) 9 (according to invention) 80% PP + 18.7% (a1) + 11 0.6% (b2) + 0.7% (c2)

[0130] The results in the above Table 1 clearly show that the inventive combination of components significantly reduces the amount of odor contributing butyric acid.