AU705299B2 - Flame-resistant plastics molding composition of improved stability to light - Google Patents

Description

i Our Ref: 572790 P/00/011 Regulation 3:2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT o 4S00 000@ 0a** as.

a.

otaa 0 a 0** *u 4tt Applicant(s): Hoechst Aktiengesellschaft D-65926 Frankfurt Am Main

GERMANY

Address for Service: Invention Title: DAVIES COLLISON CAVE Patent Trade Mark Attorneys Level 10, 10 Barrack Street SYDNEY NSW 2000 Flame-resistant plastics molding composition of improved stability to light The following statement is a full description of this invention, including the best method of performing it known to me:- 5020 -1- HOECHST AKTIENGESELLSCHAFT HOE 94/F 390 Dr.DW/wo Description Flame-resistant plastics molding composition of improved stability to light The invention relates to flame-resistant plastics molding compositions which comprise an intumescence flameproofing agent based on ammonium polyphosphate (APP) and, by the addition of suitable light stabilizers, have an improved stability to light compared with plastics molding compositions which likewise comprise light stabilizers and have been rendered flame-resistant with customary halogen-containing flameproofing agents.

It is known to provide plastics molding compositions with a flame-resistant treatment with halogen-containing 15 organic compounds, in particular in combination with antimony trioxide. This is described, for example, in Troitzsch, "Brandverhalten von Kunststoffen" [Burning properties of plastics], Hanser-Verlag, Munich (1982), pages 48 to 51. The use of halogen-containing 20 flameproofing agents has the disadvantage that, by the addition of such compounds, the stability to light of the plastics molding compositions treated with these compounds is severely reduced (Vogel, "Flammfestmachen von Kunststoffen" [Rendering plastics flame resistant], Huthig-Verlag, Heidelberg (1966), page 26). This disadvantage also cannot be eliminated adequately by the addition of light stabilizers.

It is likewise known to provide plastics molding compositions with a flame-resistant treatment with halogen-free intumescence flameproofing agents based on ammonium polyphosphate, such as are described, for example, in US-A-4198493, US-A-4461862, EP-A-258685 and EP-A-0584567.

It has now been found, surprisingly, that plastics -2molding compositions treated with an intumescence flameproofing agent based on ammonium polyphosphate in combination -'ith light stabilizers have both an adequate flameproofing effect and a good stability to light.

The invention thus relates to a flame-resistant polymeric molding composition of improved stability to light, comprising to 80%by weight of a polymer or a polymer mixture, to 50% by weight of one or more flameproofing agents based on ammonium polyphosphate, up to 2.0% by weight of one or more UV absorbers or light stabilizers, based on the polymer content of the total mixture, and, if appropriate, up to 80% by weight of fillers and reinforcing agents, and/or up to 10% by weight of further additives.

The polymers can be the substances listed below: 1. Polymers of mono- and diolefins, for example polyethylene of high, medium or low density (which can optionally be crosslinked), polypropylene, polyisobutylene, polybut-1-ene, polymethylpent-1-ene, polyisoprene or polybutadiene, and polymers of cycloolefins, such as, for example, of cyclopentene or norbor- S. nene.

2. Mixtures of the polymers mentioned under for example mixtures of polypropylene with polyethylene or with polyisobutylene.

3. Copolymers of mono- and diolefins with one another or with other vinyl monomers, such as, for example, ethylene/propylene copolymers, propylene/but-1-ene copolymers, propylene/isobutylene copolymers, ethylene/but-1-ene copolymers, propylene/butadiene copolymers, isobutylene/isoprene copolymers, ethylene/alkylacrylate copolymers, ethylene/alkyl I 0 -3 methacrylate copolymers, ethylene/vinyl acetate copolymers or ethylene/acrylic acid copolymers and salts thereof (ionomers), as well as terpolymers of ethylene with propylene and a diene, such as hexadiene, dicyclopentadiene or ethylidenenorbornene.

4. Polystyrene and poly(p-methylstyrene).

Copolymers of styrene or a-methylstyrene with dienes or acrylic derivatives, such as, for example, styrene/butadiene, styrene/maleic anhydride, styrene/acrylonitrile, styrene/ethyl methacrylate, styrene/butadiene/ethyl acrylate and styrene/acrylonitrile/methacrylate; mixtures of high impact strength of styrene copolymers and another polymer, such as, for example, a polyacrylate, a diene polymer or an ethylene/propylene/diene terpolymer; and block copolymers of styrene, such as, for example, styrene-butadiene-styrene, styrene-isoprene-styrene, styrene-ethylene/butylene-styrene or styreneethylene/propylene-styrene.

6. Graft copolymers of styrene, such as, fr example, styrene on polybutadiene, styrene and acrylonitrile on polybutadiene, styrene and maleic anhydride on polybutadiene, styrene and alkyl acrylates or alkyl methacrylates on polybutadiene, styrene and acrylonitrile on 25 ethylene/propylene/diene terpolymers, styrene and acrylonitrile on polyalkyl acrylates or polyalkyl methacrylates, styrene and acrylonitrile on acrylate/butadiene copolymers, and mixtures thereof with the copolymers mentioned under which are known, for example, as so-called ABS, MBS, ASA or AES polymers.

7. Polymers which are derived from unsaturated alcohols and amines or their acyl derivatives or acetals, such as polyvinyl alcohol, polyvinyl acetate, stearate, benzoate or maleate, polyvinylbutyral, polyallyl phthalate and polyallylmelamine.

4 8. Polyphenylene oxides and sulfides and mixtures thereof with styrene polymers.

9. Polyurethanes which are derived from polyethers, polyesters and polybutadienes having terminal hydroxyl groups on the one hand and aliphatic or aromatic polyisocyanates on the other hand, and precursors thereof (polyisocyanate-polyol prepolymers).

Crosslinked polymers which are derived from aldehydes on the one hand and phenols, urea or melamine on the other hand, such as phenol/formaldehyde, urea/formaldehyde and melamine/formaldehyde resins.

11. Mixtures of the abovementioned polymers or mixtures of polymers which are not mentioned above, such as, for example, PP/EPDM, polyamide 6/EPDM or ABS, PVC/EVA, PVC/ABS, PVC/MBS, PC/ABS, PBTP/ABS, PC/ASA, POM/thermo- S" plastic PUR, POM/MBS, PPE/HIPS, PA/HDPE, PA/PP and

PA/PPE.

'f Preferred polymers are polyosifins, in particular polypropylene, polyethylene and ethylene/vinyl acetate 20 copolymers.

The plastics molding composition according to the invention furthermore comprises 15 to 50%, preferably 20 to 40% by weight of a flameproofing agent based on ammonium polyphosphate.

To achieve the stability to light, the plastics molding composition according to the invention comprises, by Sthemselves or in combination, UV absorbers or light stabilizers, the total amount of WV absorbers and light stabilizers added being up to 2,0% by weight, based on the polymer content of the total mixture.

Molding compositions which comprise 0.3 to 1.5% by weight of UV absorbers and/or light stabilizers, based on the

I

polymer content of the total mixture, are particularly preferred.

Possible UV absorbers or light stabilizers are the following compounds: 1. 2-(2'-hydroxyphenyl)-benzotriazoles, such as, for example, 2- -hydroxy-5' -methylphenyl) -benzotriazole, 2- (31,51 -di-t-butyl-2' -hydroxyphenyl) -benzotriazole, 2- (51 -t-butyl-2' -hydroxyphenyl) -benzotriazole, 2-[2'-hydroxy-5'-(1,1,3,3-tetramethylbutyl)phenyl]benzotriazole, 2- ,5'-di-t-butyl-2'-hydroxyphenyl) 2- -t-butyl-2' -hydroxy- 51 -methylphenyl-5-chloro-benzotriazole, 2- -sec-butyl- kl 5'-t-butyl-2'-hydroxcyphenyl)-benzotriazole, 2-(2'-hydroxy-4'-octoxyphenyl)-benzotriazole, 2-(3',5'-di-t-amyl-2'-hydroxyphenyl)-benzotriazole, 2- ,5'-bis- (aci-dimethylbenzyl) -hydroxyphenyl) benzotriazole, mixture of 2-(3'-t-butyl-2'-hydroxy- (2-octyloxy-carbonylethyl) -phenyl) azole, 2- (3'-t-butyl-5' (2-ethylhexyloxy)-carbony.ethyl) 2- t bu tyl1 2' -h y drox y- (2-methoxycarbonylethyl)phenyl) 0azole, 2- (3'-t-butyl-2'-hydroxy-5'- (2-methoxycarbonylethyl)phenyl)-benzotriazole, 2- (3'-t-butyl-2'-hydroxy- 5'-(2-octyloxy-carbonylethyl)phenyl)-benzotriazole, 2- -t-butyl-5'- (2-ethylhexyloxy) -carbonylethyl] 2'-hydroxyphenyl) -benzotriazole, 2- -dodecyl-2' -hy- -methyiphenyl) -benzotriazole, and 2- -t-butyl- 2' -hydroxy-5' (2-isooctyloxycarbonylethyl)phenyl-benzotriazole and 2,2' -methylene-bis- (l,1,3,3-tetramethylbutyl) -6-benzotriazol-2-yl-phenol]; and the transesterif ication product of 2- -t-butyl-5' (2-methoxy-carbonylethyl) -21 -hydroxy-phenyl) -benzotriazole with polyethylene glycol 300.

2. 2-Hydroxybenzophenones, Buch as, for example, the 4-hydroxy, 4-methoxy, 4-octoxy, 4-decyloxy, 4-dodecyloxy, kv,- -6- 4-benzyloxy, 4,2',4'-trihydroxy and 2'-hydroxy-4,4'-dimethoxy derivatives.

3. Esters of optionally substituted benzoic acids, such as, for example, 4-t-butyl-phenyl salicylate, phenyl salicylate, octyiphenyl salicylate, dibenzoylresorcinol, bis- (4-t-butylbenzoyl) -resorcinol, benzoyl resorcinol, 2, 4-di-.t-butylphenyl 3, 5-di-t-butyl-4-hydroxybenzoate, hexadecyl 3, 5-di-t-butyl-4-hydroxybenzoate, octadecyl 3,5-di-t-butyl-4-hydroxybenzoate and 2-methyl-4, 6-dit-butylphenyl 3, 5-di-t-butyl-4-hydroxybenzoate.

4. Acrylates, such as, for example, ethyl or isooctyl a-cyano-#,Pj-diphenylacrylate, methyl oa-carbomethoxycinnamate, methyl or butyl ca-cyano-16-methyl-p-methoxycinnaniate, methyl oa-carbomethoxy-p-methoxy-cinnamate and N- (j-carbomethoxy-f3-cyanovinyl) -2-methyl-indoline, Nickel compounds, such as, for example, nickel complexesof 2,21 -thio-bis- (1,1,3,3-tetramethylbutyl) phenol] such as the 1: 1 or the 1: 2 complex, optionally with additional ligands, such as n-.butylamine, triethanolamine or N-cyclohexyl-diethanolamine, nickel dibutyl- .dithiocarbamate, nickel salts of 4-hydroxy- 3, 5-di-t-butyl-benzylphosphonic acid monoalkyl esters, such as of the methyl or ethyl ester, nickel complexes of ketoximes, such as of 2 -hydroxy-4 -methyl -phenyl -indecylketoxime, and nickel complexes of l-phenyl-4-lauroyloptionally with additional ligands.

6. Sterically hindered amines, such as, for example, bis-(2,2,6,6-tetramethyl-piperidyl) sebacate, bis-(2,2,6,6-tetramethyl-piperidyl) glutarate, bis-(2,2,6,6-tetramethyl-piperidyl) succinate, bis- 6-pentamethylpiperidyl) sccin ate, btl bis-(1,2,2,6,6-pentamethylpiperidyl) sebtacate, bis- (1,2,2,6,6-pentamethylpiperidyl) gltarate, btl 3,5-di-t-butyl-4-hydroxybenzylmalonate, 2,2, 6,6-tetramethylpiperidyl behenate, 1,2,2,6,6-pentamethylpiperidyl 7behenate, the condensation product of 1-hydroxyethyl- 2,2,6, 6-tetraxnethy1-4-hydroxypiperidile and succinic acid, the condensation product of N,N'-bis-(2,2,6,6-tetraxethyl-4-piperidyl) -hexamethylenediamine and 4-t-octylamino-2,6-dichloro-1,3,5-s-triazine, tris-(2,2,6,6-tetramethyl-4-piperidyl) nitrilotriacetate, tetrakis- (2,2,6,6-tetraznethyl-4-piperidyl) 1,2,3,4-butanetetraopiperazinone) 4-benzoyl-2,2, 6, 6-tetramethyl-piperidine, 4-stearyloxy-2,2, 6, 6-tetramethylpiperidine, 4-stearoyloxy-2,2,6, 6-tetramethylpiperidine, 4-stearyloxy- 1,2,2,6,6-pentamethylpiperidine, 4-stearoyloxy-1,2, 2 6 6 -pentartethylpiperidine, bis- 6-pentamethylpiperidyl) 2-n-butyl-2-(2-hydroxy-3,5-di-t-butylbenzyl)malonate, bis- (1,2,2,6,6-pentamethylpiperidyl) -2-n-butyl- 2- (4-hydroxy-3,5-di-t-butylbenzyl) -malonate, 3-n-octyl- 7,7,9, 9-tetramethyl-1,3, 8-triazaspiro 2,4-dione, bis- (1-octyloxy-2,2,6,6-tetramfethyl-piperidyl) 9. sebacate, bis- (1-octyloxy-2,2,6,6-tetramfethylpiperidyl) 20 succinate, the condensation product of N,N' -bis- 6, 6-tetramethyl-4-piperidyl) -hexamethylene-diamine

A

and 4-morpholino-2, 6-dichloro-1,3, 5-triazine, the condensation product of 2-chloro-4, 6-di- (4-n-butylaminoj2,2,6,6-tetramethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamfino)ethane, the condensation product of 2-chloro-4,6-di-(4-methoxy-propylailo- 2, 2,6,6 -tetramnethylpiperidyl)-1, 3,S5-triazine and, 2-bis (3-azinopropylamino)ethane, the condensation product of 2-chloro-4,-di- (4-methoxypropylamino-l,2,2,6,6-pentamethylpiperidyl)-l,3,5-triazine and 1, 2-bis- (3 -aminopropylamino) ethane, the condensation product of 2-chloro- 4,6-di- (4-n-butylamino-l,2,2,6,6-pentamethylpperidyl) 1,3,5-triazine and 1,2-bis- (3-aminopropylamino) ethane, reaction products of 2-chloro-4, 6-di- (4-n-butylaxnino- 2,2,6,6-tetramethylpiperidyl) -1,3,5-triazine with monoor polyfunctional amnines, between one and all the active H atoms on the amine being replaced, such as with ethylenediamine, diethylenetriamine, triethylenetetraznine, hexamethylenediamine and 1,2 -bis- (3-amino- -8propylamino) ethane, reaction products of 2-chloro-4, 6-di- (4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)- 1,3,5-triazine with mono- or polyfunctional amines, between one and all the active H atoms on the amine being replaced, such as with ethylenediamine, diethylenetriamine, triethylenetetramine, hexamethylenediamine or 1,2-bis- (3-aminopropylamino) ethane, reaction products of 2-chloro-4,6-di- (4-n-butyl -amino- 2,2, 6,6-tetramethylpiperidyl)-1,3,5-triazine and 4-t-octylamino-2,6-dichloro-1,3,5-s-triazine with mono- or polyfunctional amnines, between one and all the active H atoms on the amine being replaced, such as with ethylenediamine, diethylenetriamine, triethylenetetramine, hexamethylenediamine or 1,2-bis- (3-aminopropyl-aiino) ethane, reaction products of 2-chloro-4,6-di-(4-n-butylamino- 1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine and 4-t-octylamino-2,6-dichloro-l,3,5-s-triazine with monoor polyfunctional amines, between one and all the active H atoms on the amine being replaced, such as with 20 ethylenediamine, diethylenetriamine, triethylenetetramine, hexamethylenediamine or 1,2-bis- (3-aminopropylamino) ethane, reaction products of 2-chloro-4,6-di- (4-n-butylamino-2,2,6,6-tetramethylpiperidyl) zine and 4- (4 -n-butylamino- 2, 2, 6, 6 -tetramethylpiperidyl) 25 2,6-dichloro-l,3,5-s-triazine with mono- or polyfunctional amines, between one and all the active H atoms on the amine being replaced, such as with ethylenediamine, diethylenetriamine, triethylenetetramine, hexamethylenediamine, 1,2-his- (3-aminopropylamino) ethane, reaction products of 2-chloro-4,6-di-(4-n-butylamino- 1,2,2,6,6-pentamethylpiperidyl) -1,3,5-triazine and 4- (4-n-butylamino-2,2,6,6-tetramethylpiperidyl) -2,6-dichloro-1,3,5-s-triazine with mono- or polyfunctional amines, between one and all the active H atoms on the amine being replaced, such as with ethyjlenediamine, diethylenetriamine, triethylenetetramine, hexamethylenediamine, 1,2-his- (3-aminopropylamino) ethane, 3-dodecyl- 7,7,9,9-tetramethyl-1,3,S-triazaspiro-[4,5]-decane- 2,4-dione, oligomeri zed 2,2,4,4-tetramethyl-20- (oxiranyl- -9methyl) -7-oxa-3,20-diazadispiro- [5.1.11.2] -heneicosan-21one, oligomerized 1,2,2,4,4-pentanethyl-20- (oxiranylmethyl) -7-oxa-3,20-diaza-dispiro- [5.1.11.2] -heneicosan- 21-one, oligomerized 1-acetyl-2,2,4,4-tetramethyl- 20-(oxiranylmethyl)-7-oxa-3,20-diaza-dispiro- 15.1. 11.2] -heneicosan- 21 -one, dodecyl-1- 4,4 -tetramethyl-'4-piperidyl)pyrrolidine-2, 5-dione, 3-dodecyl- 1- 2,2, 6, 6-pentamethyl- 4-piperidyl) -pyrrolidine- 2,2,4,4-tetramethyl-7-oxa-3,20-diaza-dispiro- [5.l.11.2]-heneicosan-21-one, 2,2,4,4-tetramethyl-7-oxa- 21-oxo-3,20-diaza-dispiro- [5.1.11.2] -heneicosane-3-propanoic acid dodecylester, 2,2,4,4-tetramethyl-7-oxa-21-oxo- 3,20-diaza-dispiro- (5.l.11L2] -henicosane-3-propanoic acid tetradecyl ester, 2,2,3,4,4-p entamethyl-7-oxa-3,20-diazadispiro- [5.1.ll.2]-heneicosan-21-one, 2,2,3,4,4-pentamethyl-7-oxa-21-oxo-3 ,20-diaza-dispiro- [5.1.11.2] -heneicosane-3-propanoic acid dodecyl ester, 2,2, 3,4,4-pentamethyl-7-oxa-21-oxo-3,20-diaza-dispiro- [5.1.11.2] -heneicosane-3-propanoic acid tetradecy. ester, 3-acetyl- 20 2,2,4,4-tetramethyl-7-oxa-3,20-diaza-dispiro- [5.1.11.2J-heneicosan-21-one, 3-acetyl-2,2,4,4-tetramethyl-7-oxa-21-oxo-3,20-diaza-dispiro- [5.1.11.2] -heneicosane-3-propanoic acid dodecyl ester, 3-acetyl- A 2,2,4,4-tetramethyl-7-oxa-21-oxo-3,20-diaza-dispiro- 25 [5.1.11.2] -heneicosane-3-propanoic acid tetradecyl ester, 3,3' -hexahydro-2, -hexaaza- 2,2',6,6'-bismethano-7,8-dioxo-4,4'-bis-(1,2,2,6,6-pentamethyl-4-piperidyl)-biphenyl, poly-N,N'-bis- (2,2,6,6-tetraniethyl-4-piperidyl)-1,8-diazadecylene, the addition compound of 2,2,6, 6-tetramethyl-4-allyloxypiperidine and polymethyihydridosiloxane (molecular weight up to 4000), the addition compound of 1,2,2,6, 6-pentamethyl-4-allyloxy-piperidine and polymethyihydridosiloxane (molecular weight up to 4000), N,N'-di-formyl-N,N'-bis-(2,2,6,6-tetraiethyl-4-piperidinyl) -hexamethylenediamine, ILN' -di-formyl-N,N' -bis- 2,6, 6-pentamethyl-.4-piperidinyl) -hexamethylenediamine, 5,11-bis- (2,2,6,6-tetramethyl-4-piperidinyl) 3,5,7,9,11,13-hexaaza-tetracyclo-7.4.0 3 -tetra- 10 decane-8,14-dione, 5,11-bis- (1,2,2,6,6-pentamethyl- 4-piperidinyl) 5,7, 9, 11, 13-hexaaza-tetracyclo- (7,4 0.0 2 7 .1 3 13 J] -tetradecane-8,14-dione, 7,7,9,9-tetramethyl-8-acetyl-3-dodecyl-1,3,8-triaza-spiro- [4.5J-decane-2,4-dione, bis-(2,2,6,6-tetramethyl-4piperidinyl) ((4-methoxyphenyl) -methylene] -propanedioate, bis- (1,2,2,6,6-pentaxnethyl-4-piperidinyl) 2,4,6-tris- (N-cyclohexyl-N- (3,3,4,5,5-pentamethyl-piperazinone- 1-yl)-ethyll -amino) -1,3,5-triazine, the copolymer of styrene oa-methylstyrene and maleic anhydride reacted with 4-amino-2, 2,6, 6-tetramethylpiperidine and octadecylamine, the copolymer of styrene with ci-methylstyrene and maleic anhydride reacted with 4-amino- 1,2,2,6, 6-pentamethylpiperidine and octadecylamine, polycarbonate with E(2,2,6,6-tetramethyl-4-piperidinyl)-imino-bis- [ethanol] as the diol component, polycarbonate of 6,6-pentamethyl-4-piperidinyl) imino] -bis- [ethanol] as the diol component, the copolymer of maleic anhydride and an a-olef in of up to C 3 0 reacted S 20 with 4 amino- 2, 2,6, 6 -tetramethylpiperidine, copolymers of "tomaleic anhydride and an a-olefin of up to C 3 0 reacted4 too*with 1-acetyl-4-amino-2,2,6,6-tetramethylpiperidine, the copolymer of maleic anhydride and an a-olef in of up to 30 reacted with 4 -amino- 1,2,2, 6, 6-pentamethylpiperidine, and the N-alkyl and N-aryloxy derivatives of the above- *4 4 mentioned compounds with free NH groups on the piperidine, specifically oi-methylbenzyloxy and alkoxy of

C

1 to C 18 Oxalic acid diamides, such as, for example, 4,4'-dioctyloxy-oxanilide, 2,2'-dioctyloxy-5,5"-di-t-butyl- 4 oxanilide, 2,2' -di-dodecyloxy-5,5' -di-t-butyl-oxanilide, 2 -ethoxy- 2' -ethyl -oxanilide, N,N' -bis- (3-dimethylaminopropyl) -oxalamide, 2 -ethoxy-5 -t-butyl-2' -ethyloxanilide and its mixture with 2-ethoxy-2'-ethyl-5,4'-di-t-butyloxanilide, and mixtures of o- and p-methoxy- and of oand p-ethoxy-disubstituted oxanilides.

8. 2- (2-Hydroxyphenyl) -1,3,5-triazines, such as, for 0 8. 2- (2-Hydroxypheriyl)-1,3,5-triazines, such as, for exrjrple, 2,4,6-tris-(2-,-*oxy-4-octyloxyphenyl) 1,5,5-triazine, 2- (2-hydroxy-, octyloxyphenyl) -4,6-bis- (2,4-dimethylphenyl)-1,3,5-triazine, 2-(2,4-dihydroxyphenyl)-4,6.bis-(2,4-dimethylphenyl)- 1,3,5-triazine, 2-(2,4-dihydroxyphenyl)- 4,6-bis-(2,4-dimethylphenyl)-l,3,5-triazine, 2,4-bis- (2-hydroxy-4-propyloxyphenyl) (2,4-dimethylphenyl)-1,3,5-triazine, 2- (2-hydroxy-4-octyloxyphenyl)- 4,6-bis(4-methylphenyl)-1,3,5-triazine, 2-(2-hydroxy- 4-dodecyloxyphenyl)-4,6-bis(2,4-di-methylphenyl)- 1,3,5-triazixL-, 2- [2-hydroxy-4- (2-hydroxy-3-butyloxypropyloxy)ph-,,aiylJ 6-bis 4-dimethyiphenyl)- 1,3,5-triazine and 2- E2-hydroxy-4- (2-hydroxy-3-octyloxypropyloxy)phenyl] 6-bis (2,4-dimethyiphenyl) zine.

Light stabilizers and UV absorbers from the class of sterically hindered amines and of 2-hydroxybenzophenones are preferably employed.

20 The plastics molding compositions according to the 'A invention can also additionally comprise up to 80% by weight of fillers and reinforcing agents, such as, for example, calcium carbonate, silicates, glass fibers, asbestos, talc, kaolin, mica, barium sulfate, metal 25 oxides and hydroxides, carbon black and graphite.

.~aHolding compositions which additionally comprise 10 to 50% by weight of fillers and reinforcing agents are preferred here.

In addition, the plastics molding compositions according to the invention can also additionally comprise up to by weight of the following additives: 1. Antioxidants 1.1 Alkylated monophenols, for example 2,6-di-t-butyl- 12 -4 4-methylphenol, 2-butyl-4, 6-dimethyiphenol, 2, 6-di-butyl- 4-ethyiphenol, 2, 6-di-t-butyl-4-n-butylphenol, 2, 6-dit-butyl-4-iso-butylphenol, 2, 6-di-cyclopentyl-4-methylphenol, 2- (a-methylcyclohexyl) 6-dimethyiphenol, 2,6-di-octadecyl-4-methylphenol, 2,4,6-tri-cyclohexylphenol, 2, 6-di-t-butyl-4-methoxymethylphenol, 2, 6-di-nonyl-4-methylphenol, 2,4-dimethyl-6- (1'-methyl-undec- 1' -yl) -phenol, 2,4-dimethyl-6- -methyl-heptadec-l' -yl) phenol, 2 1 4-dimethyl-6- -methyl-tridec-1' -yl) -phenol and mixtures of these compoundi.

1.2 Alkyithiomethyiphenols, for example 2,4-di-octylthiomethyl- 6- t-butylphenol, 2, 4-dioctylthiomethyl- 6-methylphenol, 2, 4-di-octylthiomethyl-6-ethylphenol and 2,6 -di-dodecylthiomethyl-4 -nonyiphienol.

1.3 Hydroquinones and alkylated hydroquinones, f or example 2,6-di-t-butyl-4-methoxyphenol, hydroquinone, 2, 5-di- t-amyl -hydroguinone, 2,6 -diphenyl ~.,4-octadecyloxyphenol, 2,6-di-t-butyl-hydroquinone, 2,5-di-t-butyl-4-hydroxyanisole, 3,5-di-t-butyl-4-hydr- 20 oxyanisole, 3,5-di-t-butyl-4-hydroxyphenyl stearate and bis- (3,5-di-t-butyl-4-hydroxyphenyl) adipate.

1.4 Hydroxylated thiodiphenyl ethers, for example 2,2'-thio-bis-(6-t-butyl-4-methylphenol), 2,2'-thio-bisphenol), 4,4'-thio-bis- (6-t-butyl-2-methyl-phenol), 4,4'-thio-bis-(3,6-di-sec.-amylphenol) and 4,4'-bis- (2,6-dimethyl-4-hydroxyphenyl) disulfide.

Alkylidene-bisphenols, for example 2,2'-methylenebis- (6-t-butyl-4-methylphenol) 2,21 -methylene-bis- (6-tbutyl-4-ethylphenol) 2,2' -methylene-bis- [4-methyl-6- (amethylcyclohexyl) -phenol], 2,2' -methylene-bis- (4-methyl- 6-cyclohexylphenol), 2,2' -methylenebis- (6-nonyl-4-methylphenol), 2,2'-methylenebis-(4,6-di-t-butylphenol), 2,2'-ethylidene-bis-(4,6-di-t-butylphenol), 2,2'-ethylidene-bis- (6-t-butyl-4-isobutylphenol, 2,2' -methylene-bis- 13- (c-methylbenzyl) -4-nonyiphenol], 2,2' -methylenebis (6-cx,c-dimethylbenzyl) -4-nonyiphenol], 4,4' -methylenebis-(2,6-di-t-butylphenol), 4,4'-methylene-bis-(6-tbutyl-2-methylphenol), 1, 1-bis- (5-t-butyl-4-hydroxy- 2-mo.thylphenyl) -butane, 2,6-bis- 2-hydroxybenzyl) -4-methyiphenol, 1, 1, 3-tris- 4-hydroxy-2-methyl-phenyl) -butane, 1, 1-bis- 4 -hydroxy-2 -methyiphenyl) -3 -n-dodecylmercaptobutane, bis- (3 -t-butyl-4 -hydroxy- 5-methyl-phenyl) -dicyclopentadiene, bis-[2-(3'-t-butyl-2'-hydroxy-5'-methyl-benzyl)- 6-t-butyl-4-methyl-phenyl] terephthalate, 1,1-bis- (3,5-dimethyl-2-hydroxyphenyl) -butane, 2,2-bis- butyl-4-hydroxyphenyl) -propane, 2,2-bis- 4 -hydroxy-2 -methyiphenyl) -4 -n-dodecylmercaptobutane and 1,1,5,5-tetra-(5.-t-butyl-4-hydroxy-2-methylphenyl)pentane.

1.6 N- and S-benzyl compounds, f or example 3,5,3',5'-tetra-t-butyl-4,4'-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3 20 tris-(3,5-di-t-butyl-4-hydroxybenzyl)-amine, bis- (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)-di-thioterephthalate, bis-3,5-di-t-butyl-4-hydroxybenzyl) sulfide and isooctyl 3,5-di-t-butyl-4-hydroxybenzylmercaptoacetate.

25 1. 7 Hydroxybenzylated malonates, for example dioctadecyl 2,2-bis-(3,5-di-t-butyl-2-hydroxybenzyl)-malonate, dioctadecyl 2- (3 -t-butyl-4-hydroxy-5-methylbenzyl) -malonate and didodecylmercaptoethyl 2,2-bis- 4 -hydroxybenzyl) -malonate.

P~ 30 1.8 Hydroxybenzyl aromatics, for example 1,3,5-tris- 5-di-t-butyl-4-hydroxybenzyi) 6-trimethylbenzene, 1,4-bis- (3,5-di-t-butyl-4-hydroxybenzyl) -2,3,5,6-tatramethylbenzene and 2,4,6-tris- (3,5-di-t-butyl-4-hydroxybenzyl) -phenol.

1.9 Triazine compounds, for example 2,4-bio-octylmercap-V r i-N -14to-ocymrcp4,-i(3,5-di-t-butyl-4-hydroxyaflio)135-rai-e lino)-1,3,5-triazine, 2-octylmercapto-4,6-bis-(3,5-di-tbutyl-4-hydroxyphenoxy)-1,3,5-triazine, 2,4,6-tris- (3,5-di-t-butyl-4-hydroxyphenoxy) -1,2,3-triazine, 1,3,5-tris- (3,5-t-butyl-4-hydroxybenzyl)-isocyalurate, 1,3,5-tris-(4-t-butyl-3-hydroxy-2,6-dimethylbelzyl)isocyanurate, 2,4, 6-tris- 5-di-t-butyl-4-hydroxyphenyll,3,5-tris-(3,5-di-t-butyl- 4 -hydroxyphenyipropionyl) -hexahydro-1, 3,5 -triazine and 1,3,5-tris- 5-dicyclohexyl-4-hydroxybenzyl) isocyanurate.

1.10 Benzylphosphonates, for example dimethyl butyl-4-.hydroxybenzylphosphonate, diethyl 3,5 -di -t-butyl- 4-hydroxybenzylphosphonate, dioctadecyl-3, 4 -hydroxybenzylphosphonate, dioctadecyl 5-t-butyl-4-hydroxy-3-methylbenzylphosphonate and the Ca salt of 3, 5-di-t-butyl-4-hydroxybenzyl-phopholic acid monoethyl 'ester.

20 1.11 Acylaminophenols, for example 4-hydroxy-lauric acid

A

anilide, 4-hydroxy-stearic acid anilide and octyl N-(3,5-di-t-butyl-4-hydroxyphenyl) -carbamate.

Esters of P-(3,5-di-t-butyl-4-hydroxyphenyl)prcopionic acid with mono- or polyhydric alcohols, such as methancl, ethanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neo- 7 .pentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris-(hydroxyethyl) NIbs(yrxyty)oa acid damie, 3thiundeano, 3-hiaentaecaoltrimethylhexanediol, trimethylolpropane and 4-hydroxymethyl- 1-phospha-2,6,7-trioxabicyclo- [2.2.2J -octane.

1.13 Esters of #-(-t-butyl-4-hydroxy-3-methylphenyl)- ~C:propionic acid with mono- or polyhydric Alcohols, such as forexample, with methanol, ethanol, octadecanol, 1, 6-hexanediol, 1, 9-nonanediol, ethylene glycol, 1, 2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris- (hydroxy) -ethylisocyanurate, N,N' -bis- (hydroxyethyl)-oxalic acid diamide, 3-thia-undecanol, 3-thiapentadecanol, trimethyihexanediol, trimethyloipropane and 4-hydroxymethyl-l-phospha-2,6,7-trioxabicyclo- octane.

1.14 Esters of 3- (3,5-dicyclohexyl-4-hydroxyphenyl) propionic acid with mono- or polyhydric alcohols, such as, for example, methanol, ethanol, octadecanol, 1,6hexanediol, 1,9-nonanediol, ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris- (hydroxy) ethyl isocyanurate, N,N' -bis- (hydroxyethyl)-oxalic acid diaxnide, 3-thiaundecanol, 3-thiapentadecanol, trimethyihexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo- -octane.

1.15 Esters of 3,5-di-t-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols, such as, for example, with methanol, ethanol, octadecanol, 1,6-hexanediol, 1, 9-nonanediol, ethylene glycol, 1, 2-propanediol, :neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris- (hydroxy) ethyl isocyanurate, N,N' -bis- (hydroxyethyl) -oxalic acid diamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane and 4-hydroxymethyl-1-phospha-2, 6,7-trioxabicyclo- -octane.

S 30 1.16 Esters of 3,3-bis-(3'-t-butyl-4'-hydroxyphenyl)butyric acid with mono- or polyhydric alcohols, such as, for example, with methanol, ethanol, octadecanol, 1, 6 -hexanediol, 1, 9 -nonanediol, ethylene glycol, 1, 2-propanediol, neopentyl glycol, thiodiethylene glycol, 1 diethylene glycol, triethylene glycol, pentaerythrito., K tris- (hydroxy) ethyl isocyanurate, N, N'-bis- (hydroxy- -16ethyl) -oxalic acid diamide, 3-thiaundecanol, 3-thiapentadecanol, trimethyihexanediol, trimethyloipropane and 4-hydroxymethyl-l-phospha-2,6,7-trioxabicyco- octane.

1.17 Amaides of j-(3,5-di-t-butyl-4-hydroxyphenyl)propionic acid, such as, for example, t-butyl -4 -hydroxyphenylpropionyl) -hexamethylenediamine, N,N' -bis- (3,5-di-t-butyl-4-hydroxyphenylpropionyl) trimethylenediamine and N,N' -bis- 5-di-t-butyl-4-hydroxyphenyipropionyl) -hydrazine.

2. Metal deactivators, such as, for example, N,N' -diphenyloxalic acid diamide, N-salicylal-N' -Balicyloylhydrazine, N,N'-bis- (salicyloyl) -hydrazine, N,N' -bis- (3,5-di-t-butyl-4-hydroxyphenylpropionyl) hydrazine, 3-salicyloylamino-1, 2,4-triazole, bis- (benzylidene) -oxalic acid dihydrazide, oxanilide, isophthalic acid dihydrazide, sebacic acid bis-phenylhydrazide, N,N'-diacetyl-adipic acid dihydrazide, N,N'-bis-salicyl- :,too 0oyl-oxalic acid dihydrazide and N,N'-bis-salicyloylthiopropionic acid dihydrazide.

3. Phosphites and phosphonites, such as, for example, triphenyl phosphite, diphenyl alkyl phosphites, phenyl dialkyl phosphites, tris- (nonylphenyl) phosphite, '09 trilauryl phosphite, trioctadecyl phosphite, distearyl pentaerythritol diphosphite, tris- (2,4-di-t-butylphenyl) 00 phosphite, diisodecyl pentaerythritol-diphosphite, bis- (2,4-di-t-butylphenyl) pentaerythritol disphosphite, bis- 6-di- t-butyl-4-methylphenyl) pentaerythritol diphos- 0.06 phite, bis-isodecyloxy-pentaerythritol diphosphite, bis- 0 4 30 4-di-t-butyl-6-methylphenyl) pentaerythritol diphosphite, bis- 6-tri-t-butylphenyl) 'pentaerythritol diphosphite, tristearyl sorbitol-triphosphite, tetrakis- (2,4-di-t-butylphenyl) 4,4' -biphenylene-disphosphonite, 6 -isooctyloxy-2,4, 8,10 -tetra- t-butyl -12H-dibenz Ed,g] 1,3,2-dioxaphosphocin, 6-fluoro-2,4,8,10-tetra-t-buty1- 12 -methyl-dibenz- 3, 2-dioxaphosphocin, hk- -17 bis-(2,4-di-t-butyl-6-methylphenyl) methyl phosphite, bis-(2,4-di-t-butyl-6-methylphenyl) ethyl phosphite and tris(2-t-butyl-4-thio-(2'-methenyl-4'-hydroxy-5'-tphenyl phosphite.

4. Peroxide-destroying compounds, such as, for example, esters of 3-thiodipropionic acid, such as the lauryl, stearyl, myristyl or tridecyl ester, mercaptobenzimidazole, the zinc salt of 2-mercaptobenzimidazole, zinc alkyl-dithiocarbamates, zinc dibutyl-dithiocarbamate, dioctadecyl monosulfide, dioctadecyl disulfide and pentaerythritol tetrakis- (-dodecylmercapto)-propionate.

Polyamide stabilizers, such as, for example, copper salts in combination with iodides and/or phosphorus compounds and salts of divalent manganese.

6. Basic costabilizers, such as, for example, melamine, polyvinylpyrrolidone, dicyandiamide, triallyl cyanurate, urea derivatives, hydrazine derivatives, amines, polyamides, polyurethanes and alkali metal and alkaline earth O, metal salts of higher fatty acids, for example Ca S. 20 stearate, Zn stearate, Mg behenate, Mg stearate, Na ricinoleate, K palmitate, antimony pyrocatecholate or tin pyrocatecholate.

7. Nucleating agents, such as, for example, 4-t-butylbenzoic acid, adipic acid, diphenylacetic acid and S 25 dibenzylidenesorbitol.

3 8. Other additives, such as, for example, plasticizers, lubricants, emulsifiers, pigments, optical brighteners, antistatics and blowing agents.

The additives are incorporated into the organic polymers by generally customary methods. The incorporation can be carried out, for example, by mixing or applying the compounds and if appropriate further additives into or onto the polymer immediately after the polymerization or I I -~1311 13a a i =r~a~wyii- 18 r0 4' into the melt before or during shaping. The incorporation can also be effected by applying the dissolved or dispersed compounds to the polymer directly, or mixing them into a solution, suspension or emulsion of the polymer, the solvent subsequently being allowed to evaporate, if appropriate. The compounds are also active if they are subsequently incorporated into an already granulated polymer in a separate processing step.

The various additional additives of the abovementioned groups 1 to 8 are added to the polymers to be stabilized in an amount of up to 10, preferably 0.01 to 5% by weight, based on the total weight of the molding composition.

The compounds to be used according to the invention can 15 also be added to the polymers to be stabilized in the form of a masterbatch, which comprises these compounds, for example, in a concentration of up to 75% by weight.

The plastics molding composition according to the invention can be used in various forms, preferably in injec- 20 tion molding and thick-walled extrusion applications.

The following examples and tables are intended to illustrate the invention in more detail.

A polypropylene homopolymer having a melt flow index MFI 230/5 of 55 g/10 minutes (®Hostalen PPU 0180, Hoechst AG) was employed for preparation of the flame-resistant and optionally UV-stabilized plastics molding compositions.

The following commercially available products were used as flameproofing agents: ®Hostaflam TP AP 750 (Hoechst AG) as a halogen-free flameproofing agent based on ammonium polyphosphate; tetrabromobisphenol A bis(2,3-dibromopropyl ether), called OBPE (octabromophenol ether) below (obtainable, for example, from Riedel de Haen) as a bromine-containing flameproofing agent in combination with antimony trioxide; and 1,2,3,4,7,8,9,- I a I 7 it -19 10,13,13,14,14-dodecachloro-1,4,4a,5,6,6a,7,10,10a,ll,- 12,12a-dodecahydro-l,4: 7,10-dimethanodibenzo(a,e)cyclooctene (obtainable under the name ®Dechlorane Plus 25 from Occidental Chemical Corporation) as a chlorine-containing flameproofing agent in combination with antimony trioxide.

Further recipe constituents, such as antioxidants, acid acceptors and the like, were additionally employed.

Processing was carried out by mixing the components in a fluid mixer and extrusion of the mixture in a twin-screw extruder (30 mm screw diameter, 63 cm length, temperature program (from intake to the dye) 170 0 C/180 0 C/190 0 C/20 0 2100); resulting melt temperature determined in the dye about 2200C). Granulation was carried out via a water bath using a granulator. The granules obtained in this manner were then shaped on an injection molding machine at 220 to 250 0 C to give test specimens 1 mm thick, 60 mm wide and mm long (for testing the stability to weathering), or to give test specimens 127 mm long, 12.7 mm wide and 1.6 mm i "*thick (for determination of the burning properties).

20 The stability to weathering was tested on the 1 mm thick test specimens in a Suntest apparatus from Heraeus with a Suprax filter at a black panel temperature of 550C without sprinkling. The evaluation criterion was the period of exposure to light before the occurrence of severe surface embrittlement, which was evaluated under an optical microscope at 100-fold magnification. The discoloration of the test specimens was additionally evaluated.

0 The burning properties of the test specimens were determined in accordance with the specification of UNDERWRITERS LABORATORIES: "Test for Flammability of Plastic Material UL 94" (Version of 2nd May 1975). The entry in the table means "not classifiable according to UL 94". The entries and in the table are explained in the test criteria: 1- 20 I

I

Test specimen Two sets of five specimens each, 127 mm x 12.7 mm x maximum 12.7 mm.

Two sets of specimens each both in the minimum and in the maximum material thickness of the proposed intended use are to be tested. Testing of further sets of specimens may additionally be necessary, depending on the outcome of the test.

*r

S.

S

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S s S. S S 5$S*a ,h* .05,55 Specimen a) Storage of one set of specimens pretreatment in standard climate 23/50 for at least 48 hours b) Storage of a second set of specimens in a hot air oven at 70 0

C

for 168 hours and then cooling to room temperature in a desiccator for 4 hours Specimen arran- Specimen suspended with the longigement tudinal axis vertical, 305 mm below the lower edge of the specimen is a horizontal layer of absorbent cotton of dimensions 51 mm x 51 mm x 6 mm Source of igni- Bunsen or Tirrill burner with 19 mm tion high, non-luminous flame Flaming time Twice 10 seconds per specimen, the second flaming starts as soon as the sample ignited by the first flaming is extinguished I 1 i

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1 r, ri

AA

21

S.

*I 0 Results a) Classification into class 94V-0 if the following criteria are met: no afterburning for longer than seconds after the end of flaming, total of the afterburning times of flamings not greater than seconds no burning drips, no complete burning of the specimens, no afterglowing of the specimens for longer than 30 seconds after the end of flaming b) Classification in class 94V-1 if the following criteria are met: no afterburning for longer than seconds after the end of flaming, total of the afterburning times of flamings not greater than 250 seconds, no afterglowing of the specimens for longer than 60 seconds after the end of flaming, other criteria as for a).

c) Classification in class 94V-2 if the following criteria are met: ignition of the absorbent cotton by burning drips, other criteria as for b) The experiments show that if a halogen-free flameproofing agent based on ammonium polyphosphate is used, it is possible to achieve an improved stability to light by addition of suitable light stabilizers compared with the use of halogen-containing flameproofing agents, a good flameproofing action being achievable at the same time.

In contrast to halogen-containing in particular broi,

I

22 mine-containing flameproof ing agents, the tendency to discolor when exposed to light is furthermore lower.

S.

S fl *5 S P

S

Sn S 4I

L_-

i

CL

C

SC. C i t C C L u r o r a C *St S S S SCS S 4* S S S S 3 a *4 S Example [Parts] Polypropylene ®Hostaflam TP AP 750

OBPE

®Dechlorane plus Antimony trioxide Tribasic lead sulfate Calcium stearate AO 1 AO 2 AO 3 LS 1 LS 2 A B C D E F G H I J 1 L 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 39.00 39.00 39.00 4.27 4.27 1.22 1.22 4.27 27.00 27.00 27.00 1.22 13.00 13.00 13.00 0.20 0.15 0.20 0.25 0.20 0.15 0.20 0.25 0.50 0.20 0.15 0.20 0.25 0.50 0.20 0.15 0.20 0.25 0.20 0.15 0.20 0.25 0.50 0.20 0.15 0.20 0.25 0.50 0.27 0.20 0.15 0.20 0.25 0.27 0.20 0.15 0.20 0.25 0.50 0.27 0.20 0.15 0.20 0.25 0.50 1.50 0.20 0.15 0.20 0.25 1.50 0.20 0.15 0.20 0.25 0.50 1.50 0.20 0.15 0.20 0.25 0.50 UL vertical test n.c.

Period of exposure 400 to light [hours] before severe surface embrittlement Discoloration on trace exposure to light n.c. n.c. V-0 V-0 V-0 V-2 V-2 V-2 n.c. n.c. n.c.

>2500 >2500 600 1800 1400 400 400 400 400 400 400 trace trace trace trace trace severe severe severe moder- moder- moderate ate ate AO 1 Bis-[3,3-bis-(4'-hydroxy-3'-tert.butylphenyl)-butanoic acid] glycol ester AO 2 Tris(2,4-di-tert.-butylphenyl) phosphite AO 3 #,#'-thio-di(propionic acid stearyl ester) LS 1 2,2,4,4-tetramethyl-7-oxa-3,20-diaza-dispiro[5.1.11.2]-heneicosane-21-one LS 2 Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate ja

Claims (3)

1. A flame-resistant plastics molding composition of improved stability to light, comprising to 80% by weight of a polymer or a polymer mix- ture, to 50% by weight of one or more flameproofing agents based on ammonium polyphosphate, up to 2.0% by weight of one or more UV absorbers or light stabilizers, based on the polymer content of the total mixture, and, if appropriate, up to 80% by weight of fillers and reinforcing agents, and/or up to 10% by weight of further additives.

2. A molding composition as claimed in claim 1, in which the polymer is a polyolefin, in particular polyethylene, polypropylene or an ethylene/vinyl acetate copolymer. e**

060. 3. A molding composition as claimed in claim 1 or 2, which comprises 20 to 40% by weight of a 20 flameproofing agent based on ammonium polyphosphate. Sa 4. A molding composition as claimed in at least one of claims 1 to 3, which comprises 0.3 to 1.5% by weight of UV absorber or light stabilizer, based on the polymer content of the total mixture. 25 5. A molding composition as claimed in at least one of claims 1 to 4, in which the UV absorber or light stabilizer belongs to the class of sterically hin- dered amines or 2-hydroxybenzophenones. 6. A molding composition as claimed in at least one of claims 1 to 5, which comprises 10 to 50% by weight of fillers and reinforcing agents. 7. A molding composition as claimed in at least one of 25 claims 1 to 6, which can comprise 0.01 to 5% by weight of further additives. 8. A process for the preparation of a flame-resistant plastics molding composition of improved stability to light, comprising a) 50 to 80% by weight of a polymer or a polymer mixture, b) 15 to 50% by weight of one or more flameproofing agents based on ammonium poly- phosphate, c) up to 2.0% by weight, based on the polymer content of the total mixture, of one or more UV absorbers or light stabilizers, and, if appropriate, d) up to 80% by weight of fillers and reinforcing agents and/or e) up to 10% by weight of further additives, which comprises incorporating constituents b to e into the polymer immediately after the ^K 20 polymerization or into the polymer melt before or during shaping. t 9. The process as claimed in claim 8, wherein the compounds to be incorporated are added in the form of a masterbatch with a content of up to 75% by weight. 10. The use of a molding composition as claimed in claim t l a: 1 for the production of moldings of improved stabil- ity to light which have been provided with a flame- resistant treatment. y VT I 26 11. A plastic molding composition according to any one of claims 1 to 7 and processes for making the same substantially as hereinbefore described with reference to the examples. Dated this 15th day of December 1995 HOECHST AKTIENGESELLSCHIAFT By its Patent Attorneys DAVIES COLLISON CAVE a a a. a *0L a a La., La, a a a as. a 6I4C U. S* 'v.a *9e~ *,.tOP a I F HOE 94/F 390 Abstract: Flame-resistant plastics molding composition of improved stability to light The invention relates to flame-resistant plastics molding compositions of improved stability to light comprising to 80% by weight of a polymer or a polymer mixture, to 50% by weight of one or more flameproofing agents based on ammonium polyphosphate, up to 2.0% by weight of one or more UV absorbers or light stabilizers, based on the polymer content of the total mixture, and, if appropriate, up to 80% by weight of fillers and reinforcing agents, and/or •*ony up to 10% by weight of further additives, and to a process for the preparation thereof and the use thereof for the production of moldings of improved stability to light which have been provided with a flame- resistant treatment. 0 6 oleo ai S k* c a