NL1005254C2 - Plastic composition with improved weather resistance. - Google Patents

Description

- 1 -

PLASTIC COMPOSITION

5 WITH IMPROVED WEATHER RESISTANCE

The invention relates to a plastic composition containing a polymer and at least one hindered-amine light stabilizer.

In what follows, a hindered amine light stabilizer is called a HALS compound.

A plastic composition containing a polymer and at least one HALS compound is known from US-A-3,904,581. US-A-3,904,581 discloses a plastic composition containing a polymer and a 4-aminopiperidine compound, being a HALS compound, thereby stabilizing the plastic composition against heat and light degradation. It is generally known that by stabilizing a plastic composition against degradation under the influence of heat and light, in particular against degradation under the influence of UV radiation, the weather resistance of the plastic composition improves, making the plastic composition suitable for certain applications, for example for outdoor applications.

Although a plastic composition containing a polymer and at least one HALS compound already has good weather resistance, there is still a need for a plastic composition that has improved weather resistance.

The object of the invention is to provide a plastic composition which has such an improved weather resistance.

This object is achieved according to the invention in that the plastic composition according to the invention contains a polymer, at least one HALS compound and at least one bridged amine compound with at least one N-bridgehead.

Indeed, it has surprisingly been found that a plastic composition containing a polymer, at least one HALS compound and at least one bridged amine compound with at least one N bridgehead exhibits a weather resistance significantly better than that of the known plastic composition containing the bridged amine compound with at least one N-10 bridgehead. This is all the more surprising because it has also been found that a plastic composition containing a polymer and only a bridged amine compound is hardly stabilized against degradation under the influence of heat and light and thus did not indicate that the bridged amine compound contains at least one N-bridgehead in combination with a HALS connection exhibited the property of effecting an improved weather resistance of a plastic composition.

Thus, with certain choices of the components of the plastic composition according to the invention, it was determined that the weather resistance of the plastic composition according to the invention could exhibit a weather resistance that was more than double the weather resistance of the known plastic compositions.

The Xenon test is used as a measure of weather resistance in the context of this invention. The Xenon test determines the resistance of a plastic composition to degradation under the influence of light from a filtered (borosilicate glass) Xenon lamp at a black panel temperature of 62 ° C with an intensity of 0.35 Wm ~ 2.nm ~ 1, at a wavelength of 340 nm and at a relative humidity of 55% by volume in a wet / dry cycle of 18 minutes wet and 102 minutes dry. The degradation of the plastic composition is measured as the difference of the carbonyla absorption at 1713 cm-1 and the absorption at 1860 cm-1 in function 1005254-3 - of the time during which the plastic composition is subjected to said combination of light, temperature and humidity. The weather resistance is expressed as the time that a plastic composition 5 is subjected to the said combination of light, temperature and humidity and wherein the difference of the measured carbonyl absorbances is smaller than a predetermined value. In the Xenon test used here, this value is 0.10 10 units on a scale from 0 to 1 where 0 means no absorption and 1 means total absorption of the radiation.

Preferably, as the HALS compound, a compound is selected which is derived from a substituted piperidine compound, in particular any compound which is derived from an alkyl substituted piperidyl, piperidinyl or piperazinone compound. Examples of such a compound are: - 2,2,6,6-tetramethyl-4-piperidone? 2,2,6,6-tetramethyl-4-piperidinol; bis (1,2,2,6,6-pentamethylpiperidyl) - (3 ', 5'-di-tert-butyl-4'-hydroxybenzyl) -butylmalonate; - di- (2,2,6,6-tetramethyl-4-piperidyl) sebacate; oligomer of N- (2-hydroxyethyl) -2,2,6,6-tetramethyl-25-4-piperidinol and succinic acid; oligomer of cyanoic acid and N, N-di (2,2,6,6-tetramethyl-4-piperidyl) -hexamethylenediamine; bis (2,2,6,6-tetramethyl-4-piperidinyl) succinate; bis- (1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) -30 sebacate; bis (1,2,6,6,6-pentamethyl-4-piperidinyl) sebacate; - tetrakis- (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butane tetracarboxylate; - N, N'-bis- (2,2,6,6-tetramethyl-4-piperidyl) -hexane-1,6-diamine; N-butyl-2,2,6,6-tetramethyl-4-piperidinamine; - 2,2 '- [(2,2,6,6-tetramethyl-piperidinyl) imino] bis-1005254-4 - [ethanol]; - poly ((6-morpholine-S-triazine-2,4-diyl) (2,2,6,6-tetramethyl-4-piperidinyl) -iminohexamethylene- (2,2,6,6-tetramethyl-4-piperidinyl) ) -imino); 5- 5- (2,2,6,6-tetramethyl-4-piperidinyl) -2-cycloundecyloxazole); - 1.1 '- (1,2-ethanedi-yl) -bis- (3,3', 5,5'-tetramethyl-piperazinone); 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-10 triazaspiro (4,5) decane-2,4-dione; polymethylpropyl-3-oxy- [4 (2,2,6,6-tetramethyl) -piperidinyl) -siloxane; 1,2,3,4-butane-tetracarboxylic acid 1,2,3-tr (1,2,2,6,6-pentamethyl-4-piperidinyl) -4-15 tridecyl ester; - copolymer of alpha-methylstryrene-N- (2,2,6,6-tetramethyl-4-piperidinylmaleimide and N-stearyl-maleimide; - N-2,2,6,6-tetramethyl-4-piperidinyl-N-amino oxamide, 20-4-acryloyloxy-1,2,6,6,6-pentamethyl-4-piperidine.

- mixtures of esters of 2,2,6,6-tetramethyl-4-piperidinol and fatty acids; - 1,5,8,12-tetrakis [2 ', 4'-bis (1 ", 2", 2 ", 6", 6 "-pentamethyl-4" -piperidinyl (butyl) amino) -1', 3 ', 5'-Triazin-6'-yl] -1,5,8,12-tetraazadodecane.

Preferably, di- (2,2,6,6-tetramethyl-4-piperidyl) sebacate, also known under the tradename Tinuvin * 770, is used.

The bridged amine compound having at least one N-bridged amount that can be used in the context of this invention is preferably a compound derived from a compound of the general Formula 1 or 2 (see Formula sheet), where Mx to M4 bridgeheads and each bridgehead is independently selected from carbon, nitrogen, oxygen, silicon or phosphorus, with the proviso that at least one bridgehead must always be a nitrogen atom; 1005254-5 - an N-bridge level is thus defined as a bridgehead which is a nitrogen atom; Dlf Dm, D „, D0, Dp and Dq each represent a chain with a length of 1 to 20 atoms, where the number of atoms from which the 5 chains are built up is equal to 1, m, n, o, p and q , to choose any number and type of atoms independently and in which the chains can have different lengths and can be composed of different types of atoms. Suitable choices for the 10 atoms that make up the chains are carbon, nitrogen, oxygen, silicon and phosphorus. Preferably, the chains are composed of 1 to 3 carbon atoms.

Preferably, the bridged amine compound having at least one N-bridgehead 15 is selected to obtain a plastic composition having a weather resistance measured by the tenon test, greater than about 500 hours, more preferably greater than about 750 hours, most preferred higher than about 1000 hours.

Suitable choices for the bridged amine compound with at least one N-bridgehead are hexamethylene tetraamine (HMTA), diazabicyclo [2.2.2] octane (DABCO) or derivatives thereof. HMTA and DABCO are commercially easy to obtain or are easy to prepare according to well-known methods. For example, HMTA can be easily prepared from the inexpensive and easily available basic raw materials, ammonia and formaldehyde. An additional advantage of the plastic composition is that the bridged amine compound with at least one N-bridgehead is an inexpensive and simple connection that can be used in combination with at least one HALS connection, thereby improving the weather resistance of a plastic composition according to the invention. 35 improves sensitively.

The bridged amine compound having at least one N-bridgehead is preferably used as 1005254-6 salt, more preferably as an ammonium salt, most preferably as an ammonium salt. A carboxylic acid is preferably chosen as the salt former. Examples of suitable carboxylic acids are aliphatic carboxylic acids. 5 aliphatic dicarboxylic acids and aromatic carboxylic acids. Suitable choices are stearic acid, sebacic acid, cyclohexane dicarboxylic acid and benzene tricarboxylic acid. Preferably, the bridged amine compound having at least one N-bridgehead is not used as the salt, wherein the salt former contains a halogen or sulfur; Namely, it is well known that halogen or sulfur containing compounds can reduce the action of the HALS stabilizer.

The bridged amine compound having at least one N bridgehead is preferably substituted.

Examples of suitable substituents are alkyl, alkenyl, alkynyl, aralkyl, cycloalkyl and aryl groups, the substituents in turn containing functional groups. Examples of functional groups are alcohols, carboxyl groups, aldehydes, esters, amides, amines, nitriles, ethers, and any combination thereof.

Preferably, the bridged amine compound having at least one N bridgehead is substituted with at least one molecular weight substituent, preferably at least 50, more preferably at least 100.

Surprisingly, it has been found that by using the bridged amine compound with at least one N-bridgehead either in its salt form or substituted with at least one substituent with a molecular weight greater than about 50, or in its salt form and substituted with at least one substituent with a molecular weight greater than about 50, a plastic composition is obtained which has an even better weather resistance. In addition, it has been found that by using 1005254-7 the substituted or unsubstituted bridged amine compound with at least one N-bridgehead in its salt form, the bridged amine compound with at least one N-bridgehead is more stable at the usual processing temperatures of the plastic composition than the bridged amine compound with at least one N bridgehead, not in its salt form.

The plastic composition according to the invention preferably contains a thermoplastic polymer selected from the group of polyolefins and styrene polymers. Suitable choices are for example: - propylene polymers, such as propylene homopolymer, ethylene-propylene random copolymer, ethylene-propylene block copolymer and mixtures thereof. Also defined as propylene polymers in the context of this invention are mixtures containing at least 50 wt. % of one of the above-mentioned propylene polymers with, for example, polyethylene or ethylene-propylene-diene copolymers; - ethylene polymers, such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), very low-density polyethylene (VLDPE), linear-low-density polyethylene (LLDPE) or ultra-high molecular weight polyethylene (UHMWPE) ; butene polymers, such as polybutene-1.

Suitable choices of styrene polymers are, for example, polystyrene, high impact polystyrene (HIPS), styrene-acrylonitrile copolymer (SAN), acrylonitrile-butadiene-styrene copolymer (ABS), styrene-maleic anhydride copolymer (SMA), and styrene-maleimide copolymer 30 (SMI) ).

More preferably, the polymer is a propylene polymer or an ABS, even more preferably a propylene polymer.

The amount of bridged amine compound with at least one N-bridgehead that can be used in the plastic composition can vary within wide limits, which are easy to determine for those skilled in the art. The limits can vary 1005254 - 8 - depending, for example, on the type of polymer, the type of HALS compound, the other additives in the additives package, the weather resistance to be achieved or in general the type, properties and specific application of the plastic composition.

For example, it is possible to use the bridged amine compound having at least one N-bridgehead in the plastic composition in an amount, calculated relative to the amount of polymer in the plastic composition, preferably from about 0.01 wt% to about 5, 0 wt%, more preferably in an amount of 0.05 wt% to 2.5 wt%, most preferably in an amount of 0.1 wt% to 2.0, 15 wt%.

Preferably, the bridged amine compound having at least one N bridgehead is used with a HALS compound in a ratio calculated to the amount of HALS compound from about 1:20 (m: m) 20 to about 20: 1 (m : m), more preferably in a ratio of about 1:10 (m: m) to about 10: 1 (m: m), most preferably in a ratio of about 1: 5 (m: m) to about 5: 1 (m: m).

The bridged amine compound having at least one N bridgehead can be easily introduced at any time before a plastic article, for example a molded article, foil, film, fiber, coating, foam, tape, latex or powder, is made from the plastic composition in the plastic composition using one of the many standard methods known to those skilled in the art.

According to a first method, the bridged amine compound with at least one N-bridgehead, for example in the form of a powder, solution, emulsion or suspension, is mixed with the other components of the plastic composition, which for example are in the form of a powder or a melt .

1005254 - 9 -

According to a second method, the bridged amine compound with at least one N-bridgehead is first mixed with at least one HALS compound and optionally other additives in a so-called aggregates package, for example in the form of a powder, solution, emulsion or suspension and this package is then added to the plastic, for example in the form of powder or as a melt.

The plastic composition containing a polymer, at least one HALS compound and at least one bridged amine compound with at least one N-bridgehead may also contain other additives, eg antioxidants, thermal and UV stabilizers, metal deactivators, fillers, pigments , flame arresters, optical brighteners and similar additives used in plastic compositions.

The invention will be further elucidated by means of the examples without being limited thereto.

Examples

In the examples, the following general procedures were followed.

25

Preparation of a plastic composition

A polymer powder (PE, PP or ABS) was mixed in a 1: 1 weight ratio with a methanol solution containing an amount of the HALS compound di- (2,2,6,6-tetramethyl-4-piperidyl) sebacate (trade name: Tinuvin * 770, Ciba-Geigy,

Basel). This mixture was dried in an oven (Hereaus Vacutherm) for 24 hours at a temperature of 28 ° C and a pressure of about 20 mm Hg. Then, a 50 wt% solution of the bridged amine compound with at least one N-bridgehead in methanol was added to the plastic composition. This 1005254-10 plastic composition was also dried in the same manner as described above. Plastic compositions were also prepared (blanks) in this method in which the amount of HALS compound and / or bridged amine compound with at least one N bridged in the methanol solution was zero.

Production of films

The plastic composition was pressed into a film with a Fontijne press (type TP200, pressurized preheating at 190 ° C for 5 minutes, followed by applying a pressure of 100-120 kNewton, followed by cooling for 10 minutes at said pressure). The thickness was checked with a Heidenhain electronic meter.

On average, a thickness of 120-150 µm was obtained.

Determination of the weather resistance

The weather resistance of a plastic composition was determined in a weather resistance test, performed in an Atlas Material Testing Technology

Weather-0 meter (type Ci65) according to the method described in the previous description. The degradation was measured using FT-IR. The weather resistance is then expressed as the time (the number of hours) that a plastic composition is subjected to said combination of light, temperature and humidity and where the difference between the measured carbonyl absorbances is less than 0.10 units.

The following abbreviations were used in the examples: PE: polyethylene PP: polypropylene ABS: acrylonitrile-butadiene-styrene copolymer 35 DABCO: diazabicyclo [2.2.2] octane HMTA: hexamethylene tetraamine.

DABCO stearate: mono salt of stearic acid and DABCO

1005254 - 11 - DABCO distearate: salt of DABCO with two molecules of stearic acid

DABCO sebacate: salt of sebacic acid (diacid) with two molecules of DABCO

DABCO benzene tricarboxylate: salt of

benzene tricarbonic acid with three molecules of DABCO DABCO cyclohexane dicarboxylic acid: salt of cyclohexane dicarboxylic acid with 2 molecules of DABCO HMTA stearate: mono salt of stearic acid and DABCO

10

Examples I-II and comparative experiments A-D: Weather resistance of different plastic compositions.

A series of plastic compositions were prepared by the method described above. The composition of the plastic composition was varied here. PP was chosen as polymer (Stamylan *, type P83ml8, DSM, The Netherlands). Films were prepared from the plastic compositions by the method described above. The films were subjected to a weather resistance test and the weather resistance was determined as described above.

The results are summarized in Table 1.

1 0 0 5 2 5 A

c Φ m -p! 2 ^

® m C _ O O

<D ϊί Φ ininin ^ ot ^ • Q o! p t "t" cn o

M. 21 3 00 -1 rH

t_i> - * • <u Ό C φ φ a O 'c • rH ^ 1 >> iii

rH

rj O '"2 4J -P 4J

φ e <0 «<0 Λ -p .S'- '<0 S« 2 Μ, η Φ p 2 p 2 G ea (0 £ «3 2 ® .S> ι φ S φ 2 e 2 -p - p 2 -p 5 3 ge ® «®“ 0> ° 8 <8 <P 2 Ό «£« £ m .η · Η I <a I <a P g Φ Q 33 Q 33 § * 5 dp * dP < * 3 m Φ · »> · *» * Ό> φ Φ φ Φ Φ g * Φ & 01 S ® 1 | t as 3 s 2 ϋ o ° o °

• H

Λ -------

C

«P __ Ό

2 C> H dP dP dP

> «Φ ...

, - I 2 Λ * & * I P CO e rH 0) 0) 0) 5 J .5 Φ I I I O 'σ O' CM> <2 Φ H ^ «ga; Ί Ί Ί 1 φ> 2 ο ο ο λ: Ü.

θ '

RH

Ό --------

C

Φ ρ ρ ο> TO φ £ S cub ^ & cucu • 9> ι 0. (¾¾¾¾¾

φ rH

ρ ο φ ρρ φ ES_______ Η rH 6jJ <(3 O Q Η £ X) (0

Eh 11 1 1 1 1 1 11

LD O

1005254 - 13 -

Examples III-VIII and Comparative Experiments E and F: Weather Resistance of Plastic Compositions in Different Concentrations of HALS Compound and Aerobic Amine Compound Example I was repeated varying the concentrations of the HALS stabilizer and the bridged amine compound with at least one N-bridgehead . The results are summarized in Table 2. From this it can be concluded that a plastic composition in amounts from 0.1 wt% to 0.5 wt% of a bridged amine compound shows an improved weather resistance, which increases as more bridged amine compound is used. For example, the weather resistance could be more than doubled (Example 15 F versus VIII).

1005254 c (0> ra Φ «Η 40 (Ο ι-ι 40

G

Φ υ

C

ο Ο Ό _

> Μ II I I I I I I I I

Φ ο τ> ο ι C JS c Φ Φ Φ ΓΠ rH θ '-ρ “r-i σ' rage _00οοοοο λ ρ ja · £, ρ ®ρ;“ οο ^ οοοο

U Λ β 3 ^ ^ »Ρ» Ρ tP ιΗ CN

Μ! Ρ ro w ρ 2 Φ Ό φ φ> C> • φ • ι — ι · Φ _ _________ • Η J3 Φ O '40 40 40 40 40 40 40 G ^ (0 (Ο (Ο 10 (0 (0 CM, Η ai (0 (0 (0 (0 (0 (0 φ C Ό q, ρρρ ρρρ θ 'ρ c; £ (0 (0 «3 (0 (0 (0 CE ρ Z? ΦΦΦ ΦΦΦ • Η J3) ^ 40 40 40 404040 • hCP (- · 01 μ w co 05 ra

1 — I f © fc III III

Φ40> ® ooo 000 40 Φ-, uoo uuu ra 40 c .zo 1 m m «, m m m

Φ E E 2 Q Ρ P DOP

E <0.

(0 O 'm <#> dP <#> dP dP dP

ra G Φ λ,. Mt-nror asa sas O Ό O '£ ΦΦΦ ΦΦΦ 40 cc 2 o <O' o »o <O 'o> Μ · Ρ Ρ 2 40 Ρ Λ ^ —I (Ν in r-ICNin ra ρ Φ «·« ·· · - ·> C Φ Ο ο ο ο οοο 3> Φ --------- I ö Λ

G · η _ O

• V <0 6 ST-PdPdPdPdPdPdPdPdP

t — I ^ (υ _10) ·· # ····· I Ό Φ C0 ^ 1-1 ΦΦΦΦΦΦΦΦ • Ρ 'Ο ρ Ρ φ Ο'Ο'Ο'Ο'Ο'Ο'Ο'ΟΙ © θ' <η ο

£ 3 W Τΐ> · ΡτΡ * Ρ— (CN (NCN (N

Ο'Ρ ρ φ ........

Ρ -Ο 2 ο οοοοοοοο Ό Φ> J- C O 'w φ 40 G --------- ra Φ u α> φ • φ S' φ Ξ.5Ρ pppoipoupp

Φ! G> (PUP04PCUO (04P

* I £ ·· Ρ -—---- ------ (Ν φ Φ W g ja ij Η>> (0 <eh X 11 1 1 1 1 1 1 1 11 ID ο rp 1005254 - 15 -

Examples VIII-XII: Weather Resistance of Plastic Compositions with Different Aebrade Amine Compounds with at least One N Brown Head

Example I was repeated varying the type 5 bridged amine compound with at least one N bridgehead. The results are summarized in Table 3.

1005254 O) Ό O '3 t-ι

XJ

Φ O 'co Φ CU II I I I ll> 1

-P I

“C ® φ T-, 32 -p .S Λ o

C Mfl. fi — OO - O

® 0) 2 <l) ° incs 2 © ή ΰ £ w ^ r "2 <n

• H CO .S '3 ** H 00 CS

* 2 p TJ w A

X5 φ Ό 0 φ co £ u Φ ______> 1 * «« Ξ O »« ^> 1 -p c m c '-P -P X 3 Φ, 2 p O CO <0 Γ? 0 (0 S 'W-Π <0 3 o S3 u C 21 Ή II U u 2 p 3 • H 2 .5 CO co I * 2 I CO Φ

* on® S3 Φ O P O O -P

r <Ό mu'H ® -P U 2 U-P 03 ® * p ram-P 10 ® «.S W Ό -p PO ° ï« I l <'* C 3 Ό

22 oimP O O Q H 0 3 I

c x: ï 2 -p ou -g (o o ®®è.Sfimm £ x u E 2 cLT p ® <<m Φ co <o2hHoqq ® -c <

co 3 * ° 3 ïï O Q

<pp o 5 ih

0 S3 U ® O

PI w S3>, <0 2 h

-P

ra c ------ 3 -Φ 3 “Φ ^

• X I-n XJ

1 - S S '-p - dP dP dP dP

x>!? 2 i .3 "as 5 s, O'Sd-SsS '" ® <* 01 5 c 2 ï 5 «" · £. ® 2 o' o o o o 01 -P> o © • P w

I XI

3 Φ 0) g ------

• P

co 3 p φ Φ ® yes o> 2

0} C E (X Pu CU Cu CU

cu cu cu ix cu Φ Ό Xj

P 3 P

J5 · η ^

XJ

·· P ------ on φ> „M η

i — I Φ ffl X *. J LJ M

Φ 3> H * X Π H

S3 -p ”X

3 E

E-I 3 - - I - Jl in o

1 0 0 5 2 5 A

- 17 -

Example XIV: Weather resistance of PE films

Example I was repeated for two plastic compositions, both consisting of PE (LDPE, type 2304 ΑΝ00, DSM, The Netherlands) and 0.05 wt% HALS compound 5 (TinuvinR 770), added 0 and 0.06 respectively wt% DABCO. The plastic compositions were processed into blown films of 150 μη. thickness. The foils were exposed in a Suntester. The weather resistance treatment was performed in a durethane glass vessel 10 according to a method described in Polvm. Pea. & Stab ..

39, 225-233 (1993). The weather resistance was determined as described above; however, here a carbonyl absorption of 0.05 units was used to determine the weather resistance.

The weather resistance of the film without DABCO was 2700 hours and the degradation increased sharply from 2400 hours; the weather resistance of the film with DABCO was over 3500 hours and the degradation showed a constant profile at 0.03 units.

20

Example XV and comparative examples G and H; Weather resistance of ABS films

Example I was repeated for three plastic compositions, consisting respectively of ABS (RonfalinR, type 356 **, DSM, The Netherlands), ABS and 0.5 wt% HALS compound (Tinuvin * 770) and ABS, 0.5 wt % HALS compound and 0.5% by weight DABCO stearate. The degradation was measured with a colorimeter as a color change and the weather resistance was determined according to ASTM standard 1925 as the time (the number of hours) that a plastic composition is subjected to said weather resistance test and where the measured color change is less than 5 units. The results are summarized in Table 4.

35 1005254 2: 2 ~ 2 2 § o in 2 ra. S 'a ^ Μ, - *, * -' Φ Ό = * Q) O '---- c • cl rH -P _ Φ S 2 - ss 3 ^ c ® 5 s 1 «$ 1 1 01 S 8 I 5 2 9 5

01 O

4J

W.

a ---- 3 Λί ^ 1 _ Ό

W 2 * -H dp dP

5 φ.

, "β I £ λ:>; * I _ ω 2 fH α> Φ 5 iJ .5 Φ I O 'O' 2 § g -g § in I · ο ® O O o φ e

jB

O '• H - ——' "Ό C u Φ Φ« s w ω m 2 1. «« a E 51 <<<

CQ O

u & <Φ £ ----

Sj! O W>

1H p * V

Φ

jQ

<0

Eh 11 1 1 in 1 0 0 5 2 5 4

Claims (11)

1. A plastic composition containing a polymer and at least one hindered-amine light stabilizer, characterized in that the plastic composition also contains at least one bridged amine compound with at least one N-bridgehead. Plastic composition according to claim 1, characterized in that the weather resistance, measured according to the Xenon test, is higher than 500 hours. Plastic composition according to any one of claims 1 to 2, characterized in that the bridged amine compound with at least one N-bridgehead is hexamethylene tetraamine, diazabicyclo [2.2.2] octane or a derivative of either compound. Plastic composition according to any one of claims 1 to 3, characterized in that the bridged amine compound with at least one N bridgehead is a salt. Plastic composition according to claim 4, characterized in that the salt is an ammonium salt. Plastic composition according to any one of claims 4 to 5, characterized in that the salt former is a carboxylic acid. Plastic composition according to any one of claims 1 to 6, characterized in that the bridged amine compound is substituted with at least one N-bridgehead with at least one aliphatic or aromatic substituent having a molecular weight of at least 50. Plastic composition according to any one of claims 1 to 7, characterized in that the polymer is selected from the group comprising propylene polymers and acrylonitrile-butadiene-styrene copolymer (ABS). 9. Use of a bridged amine compound with at least one N-bridgehead, in combination with a 1005254 -20-hindered-amine light stabilizer as a stabilizer for a plastic composition with an improved spring resistance. 10. Use of a bridged amine compound with at least one N-bridgehead according to claim 9, characterized in that the bridged amine compound with at least one N-bridgehead contains hexamethylene tetraamine, diazabicyclo [2.2.2] octane or a derivative of one of both connections. 11. Plastic composition with improved weather resistance, as described and illustrated by the examples. 1005254