DE1544618A1 - Light stabilized plastics - Google Patents

Description

20 139

American Cyanamid Company, Wayne, New Jersey, V.St.A.

Light stabilized plastics

The invention relates to the stabilization of hard »polyvinyl chloride against decomposition by light and Warmth.

For convenience, the term "polyvinyl chloride" is represented by "PVC" in the description. The term "rigid PVC ^H , as used herein, is intended to mean a polymeric vinyl chloride material without plasticizer." Rigid PVC "is used as a contrast to the term" flexible PVC ", which is a PVC with a considerable content of plasticizer «

009812/1699 bathroom

The sensitivity to light and heat of both flexible and rigid PVC compounds is known and has been remedied to a certain extent by incorporating effective amounts of heat or light stabilizers into the polymeric compounds to be stabilized. Progress in more recent times has been achieved by using members of a specific class of heat stabilizers and members of a specific class of light stabilizers in combination incorporation of a phosphoramide described (as light stabilizer) in addition to a conventional heat stabilizer (for In "game _sodium? Cadmiumrizinoleat or an organic epoxy as hydrochloric hydrophilic agent). Although it is not expressly stated therein that the measures described are limited to the stabilization of flexible PVC, PVC is in all of the examples. Cases with dloetyl phthalate mowed (ie «a flexible \ PVO]. An attempt hard "PVC to stabilize the known method leads to discouraging results" Without plasticizers speaks wärmestabiliaiertes hard "PVC on the stabilizing effect of Phosphortriamids to" Sun is very little hard ~ PVC (doh _e PVC without plasticizer) only slightly more light-stabilized compared to PVC * which only has the heat absorber alone. The increase in stability is only slight

009812/1699 sad original

and hardly worth the effort »add another component. This can be seen from the following table «

Table I.

Groves Conc-.
(Approved) UV exposure
Hours to
I \ Yellow Index «15 : Hard PVC control Decomposition when rolling additive Organotin mercaptide
(Thermolite 31) 2 % 130 Organo-sense-mercaptid
(Thermolite 31)
and
Hexamethylpho sphor-
triamid
ι 2 #
0.5 * 185

The stabilizer that proves to be very beneficial for flexible PVC has proven, is only questionable per se with rigid PVC

009812/1699

BATH

α * Α · »

Sb is therefore an object of the invention, a stabilizer combination to create with which the stability of hard PYC increases. can be «Another object of the invention are to rigid PVC compounds stabilized in this way,

It has now been found that very hard PVC can effectively stabilize in a surprisingly simple manner "According to the invention Hart' _PVC-s containing a conventional Warmestabilieator stabilized against light duroh using ¹ of a stabilizer which contains the following two components:

1) a) A phosphorus triamide of the formula

/ ^R

o = p - τ /

in which the radicals R are identical or different lower alkyl groups or two radicals R together on a nitrogen atom a polymethylene (tetra or pentamethylene) group or Oxydiethylengruppe (i.e. a morpholino group) mean «

009812/1699

b) A monoamide of the formula

R ₉ -C-0

in which the radicals R _{1 are} each hydrogen atoms, alkyl groups with 1 to 18 carbon atoms, lower hydroxyalkyl or lower cyanoalkyl radicals and Rg is an alkyl radical with 1 to 18 carbon atoms, an alkenyl radical with 2 to 18 carbon atoms, a carboxyalkyl or carbalkoxyalkyl radical 1 to 18 carbon atoms, a dialkylaminoalkyl group with lower alkyl groups on nitrogen or an alkanamidoalkyl radical.

o) Am diamide of the formula

0 0

H η

R ₅ -C-IH-Y-HH-OR ₅

in dtr the radicals R _{5 are} alkyl create with 1 to 18 carbon atoms, alkenyl radicals with 2 to 18 carbon atoms or Η-substituted aminoalkyl radicals with 1 to 18 carbon atoms and Y is alkylene (including alkylidene) groups with 1 to 18 carbon atoms; the aminoalkyl group

BATH ORIGINAL

009812/1699

can for example by lower alkyl, Oyanalkyl and Hydr ' xyalkyl groups may be substituted by N; or

dj is a heteropolycarbamylalkane of the formula

-Alkylene-C-N. O

an imino group in the Z _? N-alkylimino group with 1 to 18 carbon atoms, thio group or phosphinylidino group? "Alkylene" denotes a radical with 1 to 3 carbon atoms, R ₄ denotes a hydrogen atom, an alkyl group with 1 to 18 carbon atoms, a lower cyanoalkyl or a lower hydroxyalkyl group and η denotes an integer between 1 and 4 and, ■ * ""' ·

2) a UV liohtabsorber of the type of 2 ~ hydroxybenzophenones _t of 2- (2-hydroxyphenyl) benzotriazoles, of the aromatic Carbonsäureester, Tr! Hydroxyaryltriazene, malonitrile- benzothiazoles, or Benzylidenmalonester Anilinomethylen- f

This gives a light-stabilizing system with 2 components. It is very surprising that the components below

QQ9812 / 1699

(a) “Hard PVO only gives a very low degree of stability, while the same constituents together achieve a degree of stability with a UV absorber that one ■ it cannot preserve one of the components alone.,

The heat stabilizer that must be used with PVC so that it can be processed at high temperatures can be one of the commercially available types. Commercially available FVO is always developed in the presence of a warning stabilizer, and the types used for this are also suitable for the purposes according to the invention in the usual effective amounts The heat-stabilizing organometallic compounds include, for example, the organosense compounds (dibutyl-slnn-dlmaleate, dibutyl-slnn-dilaurate, dibutyl-sense-thioglyooleiureootyleater); the cadmium or barium salts (barium stearate, cadmium stearate, barium ricinoleate, oadmium trioinoleate, aariumoetylphenolate); and the organic chlorinated retardants (acid acceptors) of the bpoxy type (epoxidized soybean oil, methyl epoxystearate). A complete listing of such heat stabilizers can be found in Chevasous et al, The Stabilization of Polyvinyl Chloride . Arnold Publ. Ltd., London (1963) "S ₀ 343-374. Sometimes it is sweeping, in connection with the metal

809812/1699 bad ome.NAL

containing heat stabilizer an organisehee Phoephit to use to metal halides9 as a result of the decomposition can be formed by PVG to bind as chelates *

Suitable phosphorus triamides are, for example Hexamethylphosphorus triamide. Hexaethylphosphoric triamide, tris (pentamethylene) phosphorus triamide and tris (oxydiethylen) phos called phortriamitf ..

Examples of usable monoamides are as follows

(1) Alkanamides and N ~ substituted alkanamides e.g. myristamide, stearamide, caproamide, lauramide, N, N ~ dimethyl ~ lauramide »Ν, Ν-dimethylstearamide, N- (2 ~ dodecyl) stearamide, N- (2 ^ hydroxyethyl) myristamide _> N-octadecyl lauramide and N, N-Bi θ (2-hydroxyethyl) lauramide;

(2} Alkenamides. And N-substituted alkenamides, Z ₉ B ₀ acrylamide, methacrylamide, linoleamide, oleamide, N ~ 2 ~ dodecyl ~ acrylamide, Ν, Ν-dimethylacrylamide ,, H-dodecyl «= - linoleamide and N-methy! methacrylamidj

(3) Carboxyalkylcarboxamides (including carbalkoxyalkylcarboxamides) and N-substituted derivatives ζ »Β ^ sueciniamic acid, N, N ~ Dläthylsucciamidäure,

009812/1699

15U618

H.N-diethyleuccinamic acid butyl ether,

N ^ -Bis ^ -oyanoethyleuccinamic acid and N, N ~ Bie ~ 2-hydroxyäthyladipinsäuremonoamidj

(4) Aminoalkyl carboxamides and H-substituted ones Product of it, s.B. 3-Dinethylaminopropionamid and N-Ootadecyl - ^ - diaethylaminopropionamide.

The following are suitable for the diamides according to the invention Representative example *

N, N '~ »Methylenbieaorylamid, H- (stearamidomethyl) acrylamide, Äthylenbiestearamid, H, K'-Methylenbieζ 3 octadecylaminopropion ^ amide), N _y H- jj, 1-ieobutyliden-bie (3-dimethylaminopropionaBid)], H _t H · -Athylidenbia (acrylamide), Ν, Ν · -Xthyliden-bia- (acetamide), N, N'-methylenebialauramide and N.N '^ methylenebia / 3,3'-bis (dicyanäthylamino) propionamidj.

Example · of suitable heteropolycarbamylalkanes of formula I are:

(1) Iminobis (alkanamide) e.g. 3.3 ^t -iminobis (propionamide) _> 3.3 * -iminobis] [h- (2-eyanäthy 1) -propionamidj, 3,3 »-Iminobia (2-methylpropionamide), 3 , 3 ^l -iminobis (N_dodecylpropionamide) _t 3,3'-iminobie £ H- (2-hydroxyethyl) propionamidj 3,3 * -iminobie £ H,

BATH

009812/1699

- ίο -

N'-dM2-hydroxyethyl) propionamide], 3,3'-ImInOMa (H ₁ N dimethylpropionamide) and 2,2'-Iminobi8aoetamide;

(2) 3,3 * -lower alkyliminobia (alkanamide) β.B .: 313'-methylinobiepropionamide, 3.3'-butyliminobispropionamide and 3 * 3 * -Methyliminobie (N-dodeoylpropionamide);

(3) ThiobiB (alkanaeide) sBt 3,3'-thiobispropionamide, 4 »4'-thiobiebutyramide, 3 _> 3 ^t -thlobie (H ~ dodeoylpropionamide), 3,3'-thiobie [H ~ (2-hydroxyethyl) propionamideJ _# 3 _# 3 ^f -Thioebie J 5.5-di (2-hydroiyäthyl) propioiia "iDj, 2.2 ^I -Thiobiaacetamid and 3, 3'-Thiobie (2 ~ methyl-propionamide) and j

(4) 3,3 '# 3 "-phoepbinylldin-tria (propionamidk») e.g. »3» 3 ^f _# 3 "-ΡηοβΐΛι1η7ΐ1α1η- ^ 1β (ρΓορ1οηββ1α) _# 3,3', 3" -PhoBphinyli ■ din-tria ( I-dodeoylpropionaMid) and 3 _f 3 ^f , 3 "-Phoephinylidin-tri- (H _# I · -dietthylpropionaeld) *

V (Ir di · U7-lbtorber, which, in connection with it, uses the recommended heat stabilizer and phoaphortriaid wtrden, are well-known ÜV-Abeorber from the following Klaeeen

i examples given

A. 2-Hydroxybensoph * none z2 ~ Hydrozy «4-Bethoxybenzophe non, 2 ₉ 4-Dihydrozybenzophenon _v 2 _f 2 '

Q09812 / 1699

beneophenon, 2.2% 4.4 * -TetrahydroxybenBOphenon "2,2'-dihydroxy · ^ '4 ^f' -dimethoxybenzophenon, 2 ~ hydroxy ~ 4-butoxybenzo" phenone, 2-hydroxy "-4" -actyloxybenzopü6nan, 2- Hydroxy ~ 4 -dodeoyl oxybenzophenone, 2.2 '' dihydroxy-4-octyloxybenzophenone and 4 »

Β »Benztriaeolej 2- (2 ~ hydroxy-5-methyl-phenyl) benztriaeol, 2- (2'Hydroxy« 5-oo1: ylphenyl) -benztriazole and 2- (2 Hydro3Cy-4-methoxyphenyl) benzotriazole,

O. ester phenyl salicylate, tart.-butylphenyl alioylate, phenyl reorcylate, p-octylphenylbeneoate, BIa (ρ nonylphenyl) laophthalate and Bie (ρ nonylphenyl) terephthalate

Β »Triazines! 2 _f 4.6 "trie (2 · hydroxy-4-ootyloxyphenyl) -eya.-triaain, 2- (2" Hydroaty-4-ootyloxyphenyl) -4 # 6 ^ -dixyIyI-eya.-triasin, etc "These compounds are Subject of U.S. Patent 3,118,887.

'E * Benz thiazole: 2- (4-Methaacyphenylimino) -3 <- ethyl ■ benzthiazole, 2-phenyliniino-3-ethylbenzthiazole.

F. Benzylidine meloneeter: diethyl p-methoxybenzylidene malonate, diethyl o-methoxy-benzylidene malonate, diethyl p-

BAD ORiGJNAL 009812/1699 *

15U618

hydroxybenzylidene malonate diethyldiphenylmethylene malonate * This class / of UV absorbers is described in application A 48 759 of described by the same applicant *

G, Arylaminoethylenes: N-methyl-p methoxy-anilinomethylcn raalonitrile, described in U.S. Patent 3,079,366

The amount of UV absorber should be between 0.1 and 6.0 #. based The stabilizer concentration can and should therefore preferably be the concentration of the UV absorbers be the same, you can use the rigid PVC as a whole or you can use the stabilizer for the purposes according to the invention add the components separately. In general, one puts the heat stabilizer into the PVC first and then works Add the light stabilizers to this mixture using the usual rolling process. «After thorough mixing you can do that Forming PVC into films or other products by compression molding, extrusion, injection molding, calendering or similar processes.

You can use other additives to make the rigid PVC for the Modify intended application «These include, for example, fillers, antistatic agents, pigments and Dyes.

ORIGINAL

: 8 1 2 / '' ^c - 9 9

«13 -.

The following examples explain the invention in more detail. Parts and percentages relate to weight

example 1

Foils with a thickness of 0.633 or 1.27 mm (25 or 50 mil) are produced using a PVC mass with a content of 2 # of a commercially available organo-olefin meroaptide (Thermolite 31) as a heat stabilizer. The PVC does not contain any plasticizers. All but one of the film samples are treated with additional additives as indicated in Table II. The films are exposed to UV light using a "Fluorescent Sunlamp-Blacklight" (FS-BL) lamp. The exposure is continued until the tested sample shows a difference of 15 in the "Yellow Index" (Y "I .) having. This increase in yellow color is determined with a difference colorimeter ("Colormaster") according to the following formula (see Example 8 _f USA Patent 3,079,366):

Blue Yellow Index »70 (100 ~

). green

The following additions were used in this test:

Additive A - 2-hydroxy-4-methoxybenzophenone Additive B - 2- (2-Hydroxy "5-methylphenyl) benzotriazole Additive C - trie (oxydiethylen) phosphorus triamide

ORIGINAL BATHROOM

009812/1699

Addition D Addition E Addition F Addition 6 Addition H Addition I. Addition J Addition K Addition L Addition M Addition K Addition 0 Addition F Addition Q Addition R Addition S

H, H »-methylene bieaorylamide N-stearamidomethylene acrylamide N, N '~ xthylenebiestearamide Diethyl p-methoxybenzylidene malonate - H ~ (2 ~ dodecyl) acrylamide N.N-dimethyloleamide

H.N-Bia (2 x cyanoethyl) euccinamic acid Stearamld

Ν, Ν-dimethyl-etearmid

HCn-DodecylHinolearaid H-D «icyl-3-dim (3-ethylaminopropionaaid H-Ootadeoyl-3-diiaethylaminopropionemide He N-Bie (2-hydroxyethyl) lauramide

Ν- (2-Hydroxyäthy1) lauramid

3,3 '- (methylimino) bie-N-dodecyl-propionamide

3,3 ', 3 "-PhoBphinylidin-tri- (propionainide)

Table II

O Surname , 635 mm (25 mil) thick additive 0.5 # ι
i • No.. none 0.5 pounds PS-BL exposure (hours)
to / \ Y ₃ I, from 15 1 A. 0.5 # 120 I. 2 B. 0.5 *
0.5 # 344 W. 3 C. 0.5 y
0.5 # 484 4 · A.
Ö 166 VJl B.
C. 1083 6th 1210

BAD ORIGINAL!

.15 -

Table II A 1.27 mm (50 mils) thick

• Mr. Surname additive * ! Y.I. PS-BI - Exposure (hour) none τ- at the beginning, until λ Y.I. 15 CM L. 0.5 2 130 3! A. 0.5 3 150 4 y L.
A. OO
UIUI 3 420 5 B. 0.5 3 640 6 y
I. L.
B. 0.5
0.5 3 580 7 ι G 0.5 3 820 8th L.
G Ö.5
0.5 3 620 9 H 0.5 2 780 10 A.
H OO
UlUl 5 160 11 G
I. 0.5
0.5 3 650 12th A.
I. 0.5
0.5 3 710 13th G
H 0.5 3 830 14th A.
J 0.5
0.5 5 710 15th A.
0 . 0.5
0 <5 3 790 16 A.
K 0.5
0.5 26th > 970 17th
ι A.
M. OO
UlUl 3 630 18th A.
N 0.5
0.15 4th 620 19th
i A.
P. 0.5
0.5 10 590 20th A.
Q 0.5
0.5 6th 1160 3 1100 Ή1ΠΓΤΎ / TFST - ■■■■■ '"——— ■■

BATH ORIGINAL

Table II A Continuation 1.27 mm (50 mils) thick

additive Surname D. * PS-BL exposure (hours) * a G 0.5, bie Λ Υ, Ι. 15 ■■ !, 21 A.
D. 0.5 80 12th A.
E. 0.5
0.5 620 23 α
D. 0.5
0.5 780; 24 A.
P. 0.5
0.5 680 25th A.
R. 0.5
0.5 ι
860!
i 26th A.
S. 0.5
0.5 820 27 0.5
0.5 760! ' 28 850

From Tables II and II A it can be seen that the individual stabilizer Hard PVO alone gives practically no stability that above that achieved by the presence of the heat stabilizer in PVC goes out. It also shows that the individual UV

00981 ^2/1 599

Although absorbers improve the stability of rigid PVC to a great extent, however, the effectiveness of the stabilizer according to the invention is not achieve combination

The UV absorbers used in the examples can through other UV absorbers of the class described above are replaced, achieving the same effectiveness

■■ -f - ■ -.-. Example 2

4! Pollen as thick as 0.635 mm (25 mils) will be taken out

a polyvinyl chloride compound, a hard ~ PVC < Homopolymers containing a heat stabilizing amount of a commercially available

Organotin Mercaptide (Thermolite 31) heat stabilizer, however

contains no plasticizer, manufactured «All but one of the pollen contain the following additives:

' Addition - 2-hydroxy-4-methoxybenzophenone ι addition' * hexamethylphosphoric triamide

The pollen are exposed to UV light, creating a "fluorescent." Sunlam-Blacklight "(PS-BL) lamp used and exposure it is continued until a predetermined increase in yellow color is reached ο This increase in yellow color is as a change or increase of 15 units of the yellow index (^ I ·)

00 9 812/1699

15U618

,. 18 -

Are defined. The yellow index is determined with a differential colorimeter.

The results are shown in Table III ι

ORIGINAL INSPECTED 009812/1699

Table III

No. additive Surname 0.5 * PS * -BL exposure (hours)
to Λ Y, I, i «3 ■ 1 none 0.5 % 130 2
¹ Hex methylphosphorus lyric oil 0.5 +
0.5 * 250 CS 3 2-hydroxy-4-methoxybenjophenone 530 W.
απ 4th Hexamethylphoephortriamide
2 ~ Hydroiy-4-methoxybeneophenone 1070 ■ ν »
σ;
«
Ul

Hexamethylphoephortriamide and 2-hydroxy-4-methoxybenzophenone alone extend the exposure time up to a Λ Y.I * ▼ on 15 by 120 b «w · 400 hours. If you use them together, one would expect an extension of about 520 Hours received. In reality, an extension of 940 hours is found.

This example shows the synergism that can be achieved through a Combination of a heat stabilizer, a Phosphortriamida, and a benzophenone type tjV absorber. With others Benzophenone UV absorbers, for example 2-hydroxy-4-ootyloxy " benzophenone, 2-hydroxy-4-dodecyloxybenzophenone and 2,2-dihydroxy-4-methoxybenzophenone get the same effect

Example 3

From the mass used in Example 2, 4 platelets with a thickness of 1.27 mm (50 mils) are produced. Me plates are exposed to sunlight for 3 and 6 moments outdoors. The change in Yellow Index is then determined. the Results are shown in Table IV.

009812/1699

H Φ

φ + »

• Η

.η ce E.

VO

Φ ti • Η Φ ί

CVJ

VO

• Η

CO O

κ φ

CJ

»Λ O

CVi

u \ in OO

S φ

• ö Pt • Η Ο

Ή Φ UP

t tt

O O

as

α φ

Il

H 1

+ φ

0 9 8 12/1699

_ΒΑ 0

- ■ 22 -

example

Films are produced according to the general procedure of Example 2, the amounts given in Table V. to be used on additives "

The foils are exposed to an FS-BL lamp; the results are given in Table Y *

BATH ORIGINAL 009812/1699

Table V

To * ats Surname none 0.5 % FS-BL exposure (hours) 9
ι tn
to * * *
ι σ>
GO No. Hexamethylphoephortriamide 0.5 JC bu Λ γ.ΐ. 15th 1 2-Hydroiy-4-methoxybenaophenone 0.5 * 120 2 2 »(2-hydroxy-5-β-ethylphenyl) btnstriasol 0.5 * 170 3 N-methyl-p-methoxyanillnofflethylenaalo-
nitrile 0.5 Jt 340 4th 2 .. (2-methoxyphenylimino) - 3-ethylbexus -
thiassol 0.5 % 480 5 Diphenylmthylenealonitrile 0.25 * 690 6th 2,4,6-tri (2 ~ hydroxy-4-ootyloxyphenyl) -
eyn.-triaein 0.5 * 480 7th Phenylene alloylate 0.5 % 420 θ p-'Hethoxybeneylidenealoneaurediathyl-
eeter 220 9 210 10
ι 415

Table Y (continued)

O * additive Surname 0.5 %
$ 0.5 PS-BL exposure (hours)
to A γ. Ι. 15th ι
S.
ι E. ΟΠ 0981 2 No. Hexamethylphoephortriamide
2 hydroxy ~> 4-methoxybenzopkenone 0.5 #
.0.5 56 1080 4> -
cn
ir 00 / 1 699 11 Hexamethylphosphoric triamide
2- (2-Hydroxy-5-methylphenyl) benzotriazole 0.5 *
0.5% 1210 12th Hexamethylphosphoric triamide
N = methyl-p ~ methoxyanilinomethylene
malonitrile 0.5 %
0.5 % 1110 1 * 5 Hexamethylphoephortriamide
2- (2-Methoxyphenyllmino) -3-ethyl ~
benzthiazole 0.5 y
0.5 * 720 > 4 Hexamethylphoaphortriamide
Diphenylmethylene malonitrile 0.5 9δ
0.5 9δ 1100 15th Hexamethylphosphoric triamide
2,4,6-trie (2-hydroxy-4-oetyloxy-
phenylj-aym.-triazine 0.5 ξ
0.5? Δ 430 16 Hexamethylphosphoric triamide
Phenyl salicylate 0.5 %
0.5 96 400 17th
1 Hexamethylphoaphortriamide
ρ Methoxybenzylidenemalonic acid diethyl fiber 850 18th

In the example above, different UV absorbers are used used. It can be seen from this that the advantages according to the invention are always achieved when a UV absorber is used, regardless of which class it is from originates.

Example 5

A polyvinyl chloride compound containing a heat-stabilizing amount of a commercially available organosin mercaptide heat stabilizer (Thermolite 31) is made into films with a Manufactured to a thickness of 0.635 mm (25 mils). All slides up to on one contain further additives as indicated in Table VI.

009812/1699

Table VI

Mr" additive
Urine £ none 0.5 # FS-.B1 exposure (hours)
to / ^ YI 15 1 Hezamethylphosphoric triamide 0.5 * 120 2 2- (2 "Hydrozy-5-me" fchylphenyi) benztriaiol 0.5 * 160 O
O
CD
OO 3 Tridecylphophite 0.5 *
0.5 * 590 ro
cn 4th Hezamethylpho sphortriaoid
2- (2-Hydrozy-5-aa thylpyl) benetriasol 0.5 %
0.5 *
0.5 * 150 (0 5 Hexamethylphoephortriamide
2- (2-Hydrozy-5-ethylphenyl) benztriezole
Tridecylphophite 1940 6th 2800

O O

cn

GO

Example 6

The Beieplel shows the effective stabilization of j PVC containing a pigment, a stabilizer according to

of the invention is used. i

PVO containing 2.0 pounds of TiO ₂ was rolled onto 1.27 mn (50 mil) thick polish samples and these were exposed to UV light and examined for yellow coloration after 269 and 479 hours. One sample does not contain a stabilizer (Mr. 1). The others contained the ingredients given in the table below, the same abbreviations being used as in Example 1 = ι

Table VII i

additive Mr. ₀ Urine concentration
* Y.I, BU
Beginning FS-BL exposure 1 - - 0 269 hours 479 hours «
Δ Y.I. : ^ Y.I. 2 A. 0.5 2 8th ! 16 3 1
A. 0.5
0.5 2 8 15 3 8

009812/1699

Claims (1)

15U618 Claims Against the damaging effects of light-stabilized hard PPO, characterized by 0.1 to 6 wt incorporated therein, containing the following substances stabilizersi (a) a PhoQphortriamid of the formula O = P in which the radicals R are identical or different lower alkyl groups or two radicals R on the same nitrogen atom together form a polymethylene (tetra or pentamethylene) group or an oxydiethylene group (which makes a morpholino group), mean} BATH 009812/1699 a monoamld of the formula R ₂ -CF R ^R 1 in which the radicals R ₁ vase carbon atoms, alkyl groups with 1 to 18 carbon atoms, lower hydroxyalkyl or lower oyanalkyl groups and R ^ an alkyl radical with 1 to 18 carbon atoms, an alkenyl radical with 2 to 18 carbon atoms, carboxyalkyl or carbalkoxyalkyl radicals with 1 to 18 carbon atoms , denote aminoalkyl radicals or alkanamidoalkyl groups disubstituted by lower alkyl groups; a diamide of the formula R ₅ -C-NH-Y-NH-CR ₃ η η 0 0 in the Y an alkylidene or alkylene reet with 1 to 18 Carbon atoms and the radicals R * alkyl radicals to to 18 carbon atoms, alkenyl radicals with up to 18 carbon atoms or by lower alkyl, lower Cyanoalkyl or lower hydroxyalkyl groups, N-substituted aminoalkyl radicals with up to 18 carbon atoms mean; or 009812/1699 a yeast ceria polyoarbamyl alkane of the formula -Alkylene-O <N 0 in Z an xmino group, an If -alkyl imino group with I. up to 18 carbon atoms, a thio group or a PhosphinyXi · - dinruppej "alkylene" means a radical having 1 to 3 carbon atoms; The residues R ^, hydrogen atoms, alkyl residues with 1 to 18 coals substance atoms ,, lower cyanoalkyl or lower hydroxyalkylresce and η is an integer between 1 and 4; and (b) a UV absorber iron of the type of 2 hydroxybenzophenones, 2- (2 = hydroxyphenyl) -benztriazoles _v phenylsalioylates, 2,4,6-tria (2 "hydroxyphenyl) -» synu - triazine, 2-phenyl ⁴ .minobenzthiaaole, benzylidene malonic ester or methylene malonitrile 2 ο Hart = PTO according to claim 1, characterized in that it as a stabilizer, NiN'-Diiaethylstearamid, F- (2-dodecyl) acrylamide ,, ETFLF-Diinethyloleamid, H _f if ⁵ -Bis (2-hydroxyäthyi) lauramid, Stear amide, N, N'-Methylenbis-acrylamid or !!, N'-lthylenebissfcearamid and as a UV absorber 2-hydroxy-4-methosybenzophenone or BATH ORIGINAL 009812/1699 2 (2 · Hydroxy-5-niethylphenyl) benztrlaeol contains o 3 · Hard * PVO according to claim 1 _P, characterized in that it contains H _t N ^f ^ Hethylene bisacry2amide or NtH'-dimethyletearamide as a stabilizer and diethyl p-methoxybenzyl .ideninalonate as a UV absorber. 009812/1699