An interlayer film for laminated glass comprising a resorcinol triazine UV absorber

Abstract

The present invention relates to an interlayer film for laminated glass comprising a polyvinyl acetal, a plasticizer, and a specific type of resorcinol triazine. It also relates to a laminated glass comprising the interlayer film; and to a use of the specific type of resorcinol triazine as a UV absorber in an interlayer film for laminated glass.

Description

[0001] An interlayer film for laminated glass comprising a resorcinol triazine UV absorber

[0002] The present invention relates to an interlayer film for laminated glass comprising a polyvinyl acetal, a plasticizer, and a resorcinol triazine of formula (I) as defined below. It also relates to a laminated glass comprising the interlayer film; and to a use of the resorcinol triazine of formula (I) as an UV absorber in an interlayer film for laminated glass.

[0003] For many decades, commercially available plasticized polyvinyl butyral (PVB) film for laminated glass has been supplemented with UV absorbers to block a portion of the UV radiation from the natural light. This is an efficient way of ensuring protection against harmful UV radiation for people or objects behind the laminated glass.

[0004] Tinuvin® 326 is a derivative of benzotriazole and is widely used as UV absorber in such laminates and known for its outstanding long-term stability and high absorption performance in almost the entire UV range. In addition, it can be introduced into the film formulation in a particularly simple manner during extrusion since it is relatively soluble in the commonly used plasticizers used for PVB and can thus be dissolved in the plasticizer prior to extrusion. However, Tinuvin® 326 is under evaluation for potential environmental issues.

[0005] Alternatives to benzotriazole-based UVAs have been investigated in the last years. For example, CN118256053 A describes a high polymer material composition, a diaphragm, and their applications. The composition primarily includes thermoplastic resin and an ultraviolet (UV) light absorber, specifically diethylamino hydroxybenzoyl hexyl benzoate (DHHB). EP4186694 A1 discloses plasticized interlayer films based on polyvinyl acetal that include specific UV absorbers and UV stabilizers for use in laminated safety glass. The document focuses on 1 ,3-diphenyl-1 ,3- propanedione UV absorbers, such as 3-(4-tert-butylphenyl)-1-(4-methoxyphenyl)propane-1 , 3-dione, in combination with UV stabilizers like benzotriazoles to enhance the stability and performance of the UV absorbers

[0006] EP3100989 A1 and EP2883848 A1 deal primarily with laminated glasses having high heat shielding properties and methods for mounting such laminated panes. The interlayer film of the glass includes an infrared ray reflection layer, a first resin layer containing a thermoplastic resin on one side of the infrared ray reflection layer, and a second resin layer containing a thermoplastic resin on the opposite side.

[0007] WO2011020762 A1 describes a UV-stabilized photovoltaic module that includes a photovoltaic semiconductor and one or more layers containing a synthetic polymer and a mixture of two or more different hydroxyphenyltriazines, optionally with a 2,2,6,6-tetramethylpiperidine derivative.

[0008] An object of the present invention was to provide interlayer films with an improved environmental profile, low initial color, better stability, especially better stability under UV irradiation, and / or better UV absorption.

[0009] The object was solved by an interlayer film for laminated glass comprising - a polyvinyl acetal,

[0010] - a plasticizer, and

[0011] - a resorcinol triazine of formula (I) wherein Ai , A2, A3, and A4 are independently hydrogen, C 1-C1 sal ky I, C 1-C1 salky I substituted by 1 , 2 or 3 radicals selected from the group consisting of -OH, C2-Cisalkenyloxy, -C(O)OYi and -0C(0)Y2 with Y1 and Y2 being independently C1- Cisalkyl; Ca-Csoalkyl interrupted by oxygen or Ca-Csohydroxyalkyl interrupted by oxygen.

[0012] The object was also solved by a laminated glass comprising the interlayer film.

[0013] The object was also solved by a use of the resorcinol triazine of formula (I) as an UV absorber in an interlayer film for laminated glass.

[0014] The laminated glass can be used as museum glazing, shop window glazing, motor vehicle glazing, aircraft glazing, in photovoltaic modules in LED or OLED screens, televisions, computer screens, large screens, in electrochromic, photochromic, or photoelectrochromic glass elements.

[0015] The lamination step for producing the laminated glass can be carried out such that the interlayer film is positioned between two glass sheets and the layered body thus prepared is pressed under increased or reduced pressure and increased temperature to form a laminate. To laminate the layered body, the methods can be used with and without prior production of a pre-laminate.

[0016] A so called "autoclave processes" may be carried out at an increased pressure from approximately 10 to 15 bar and temperatures from 100 to 150 °C during approximately 2 hours.

[0017] Vacuum laminators may also be used and these consist of a chamber that can be heated and evacuated, in which laminated glass can be laminated within 30 - 60 minutes. Reduced pressures from 0.01 to 300 mbar and temperatures from 100 to 200°C, in particular 130 - 160°C, are suitable.

[0018] Optionally, the glass film laminate may then be subjected to an autoclave process. The polyvinyl acetal is usually obtainable by the reaction of at least one polyvinyl alcohol with one or more aliphatic unbranched aldehyde containing 2 to 10 carbon atoms, preferably n-butyraldehyde. The polyvinyl acetal is preferably polyvinyl butyral (PVB). PVB is often used as an interlayer in laminated panes, especially in automative glazing, because it provides excellent adhesion and impact resistance, enhancing the safety and durability of the glass. It also possesses favorable properties to allow the incorporation of triazine-based UV-absorbing additives.

[0019] The polyvinyl alcohols or ethylene vinyl alcohol copolymers used to produce the polyvinyl acetals may be identical or different, pure or a mixture of polyvinyl alcohols or ethylene vinyl alcohol copolymers with different degree of polymerisation or degree of hydrolysis.

[0020] The lower limit of an acetalization degree of the polyvinyl acetal resin is usually 40 mol%, and preferably 60 mol%.

[0021] The upper limit of an acetalization degree of the polyvinyl acetal resin is usually 85 mol%, and preferably 75 mol%. In this acetalization range, the polyvinyl acetal, especially PVB, possesses decent adhesion properties and a high structural integrity but is still flexible enough for most applications in laminated glass.

[0022] In the case where a polyvinyl butyral resin is used as the polyvinyl acetal resin, the minimum amount of the hydroxyl group is usually 15 mol%. In the case where a polyvinyl butyral resin is used as the polyvinyl acetal resin, the maximum amount of the hydroxyl group is usually 35 mol%.

[0023] The polyvinyl alcohol content can be determined in accordance with DIN ISO 53240 (PVA content).

[0024] A suitable plasticizer can be selected from the following groups:

[0025] - esters of polyvalent aliphatic or aromatic acids, for example dialkyl adipates (e.g. dihexyl adipate, dioctyl adipate, hexyl cyclohexyl adipate, mixtures of heptyl adipates and nonyl adipates, diisononyl adipate, heptyl nonyl adipate), and esters of adipic acid with cycloaliphatic ester alcohols or ester alcohols containing ether compounds, dialkyl sebacates, such as dibutyl sebacate, and also esters of sebacic acid with cycloaliphatic ester alcohols or ester alcohols containing ether compounds, esters of phthalic acid, such as butyl benzyl phthalate or bis-2-butoxyethyl phthalate;

[0026] - esters or ethers of polyvalent aliphatic or aromatic alcohols or oligo ether glycols with one or more unbranched or branched aliphatic or aromatic substituents, for example esters of glycerol, diglycols, triglycols or tetraglycols with linear or branched aliphatic or cycloaliphatic carboxylic acids; examples of the latter group include diethylene glycol- bis-(2-ethyl hexanoate), triethylene glycol-bis-(2-ethyl hexanoate), triethylene glycol-bis-(2-ethyl butanoate), tetraethylene glycol-bis-n-heptanoate, triethylene glycol-bis-n-heptanoate, triethylene glycol-bis-n-hexanoate, tetraethylene glycol dimethyl ether and / or dipropylene glycol benzoate;

[0027] - phosphates with aliphatic or aromatic ester alcohols, such as tris(2-ethy lhexyl)phosphate (TOF), triethyl phosphate, dipheny l-2-ethy lhexy I phosphate, and / or tricresyl phosphate;

[0028] - esters of citric acid, succinic acid and / or fumaric acid. Mixtures of different piasticizers are possible.

[0029] Preferably, the plasticizer is selected from esters of glycerol, diglycols, triglycols or tetraglycols with linear or branched aliphatic or cycloaliphatic carboxylic acids.

[0030] More preferably, the plasticizer is selected from diethylene glycol-bis-(2-ethyl hexanoate), triethylene glycol-bis-(2-ethy I hexanoate), triethylene glycol-bis-(2-ethyl butanoate), tetraethylene glycol-bis-n-heptanoate, triethylene glycol-bis-n- heptanoate, triethylene glycol-bis-n-hexanoate, tetraethylene glycol dimethyl ether and / or dipropylene glycol benzoate.

[0031] In particular, the plasticizer is triethylene glycol bis (2-ethylhexanoate). Triethylene glycol bis (2-ethylhexanoate) is a particularly favorable plasticizer, as it offers excellent compatibility with polyvinyl acetal and maintains its plasticizing effect over a long time.

[0032] The interlayer film comprises usually at least 10 wt.%, such as 10 to 45 wt.%, preferably 20 to 40.0 wt.% and in particular 25 to 35 wt.% of the plasticizer.

[0033] Plasticizers make the polyvinyl acetal softer and more flexible, which can improve its processing characteristics and end-use performance. This is especially important in applications where the interlayer needs to withstand bending, stretching, or other forms of mechanical stress without cracking or breaking, as is typically required for the manufacture of automotive glazing, which often involves bending in one or more directions.

[0034] The interlayer film often contains further additives, such as residual quantities of water, adhesion regulators, optical brighteners or fluorescent additives, colorants, processing aids, inorganic or organic nanoparticles, pyrogenic silicic acid and / or surface active substances and adhesion promoters, such as, e.g., magnesium 2-ethy I butyrate.

[0035] The resorcinol triazine is of formula (I) wherein Ai, A2, A3, and A4 are independently hydrogen, Ci-C alkyl, C 1-C1 salky I substituted by 1 , 2 or 3 radicals selected from the group consisting of -OH, C2-Ci8alkenyloxy, -C(O)OYi and -OC(O)Y2 with Y1 and Y2 being independently C1- Cisalkyl; Ca-Csoalkyl interrupted by oxygen or Ca-Csohydroxyalkyl interrupted by oxygen Examples of Ci-C^alkyl are methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, 2-ethylbutyl, n-pentyl, isopentyl, 1-methylpentyl, 1 ,3-dimethylbutyl, n-hexyl, 1 -methylhexyl, n-heptyl, isoheptyl, 1,1,3,3-tetramethylbutyl, 1- methylheptyl, 3-methylheptyl, n-octyl, 2-ethylhexyl, 1 ,1 ,3-trimethylhexyl, 1,1,3,3-tetramethylpentyl, nonyl, decyl, undecyl, 1 -methylundecyl, dodecyl, 1 ,1 ,3,3,5,5-hexamethylhexyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl and octadecyl. Preferably, Ci-Csalkyl is methyl, n-butyl, 2-ethylhexyl or an isomeric mixture of octyl.

[0036] Examples of Ci-C alkyl, preferably C3-C18 alkyl, substituted by 1 , 2 or 3 radicals are selected from the group consisting of -OH, C2-Ci8alkenyloxy, -C(O)OYi and -0C(0)Y2, such or

[0037] CH3

[0038] - CH-O-C— C8H17o

[0039] An example of Cs-Csoalky I interrupted by one or more oxygen is -(CH2CH2-O-)3-CH3.

[0040] Examples of Cs-Csohydroxy alky I interrupted by oxygen are

[0041] An example of phenyl substituted by 1 , 2 or 3 Ci-C4alkyl is 2,4-dimethylphenyl.

[0042] Preferably, A1, A2, A3 and A4 are independently hydrogen or Ci-Cisalkyl.

[0043] Preferably, A2 is hydrogen and A1, A3 and A4 are independently Ci-Cisalkyl.

[0044] In a preferred form, the resorcinol triazine is of formula (la) (la). In the context of the invention, "Cx-Cyalkyl " and " Cx-Cyalkyl substituted by 1 , 2 or 3 radicals" can refer to both linear and / or branched alkyl chains, where x is a natural number and y is a natural number greater than x. With other words "Cx-Cyal ky I" and "Cx-Cyal ky I substituted by 1 , 2 or 3 radicals" refer to carbon chains that can vary in length and structure. These carbon chains can be either linear or any kind of branched structure, unless otherwise specified. For example, Ci-Cisalkyl can be any linear alkylgroup starting from a methylgroup up to an octadecylgroup. Alternatively, Ci-C^alkyl can also be any alkylisomer having at least 4 carbon atoms ( / so-butyl) and having at maximum 18 carbon atoms (for example / so-octadecyl).

[0045] In another preferred form, the resorcinol triazine is a mixture of at least two different resorcinol, where at least one of the at least two different resorcinol triazines is a resorcinol triazine of the formula (I), preferably each is a resorcinol triazine of the formula (I)..

[0046] In another preferred form, the resorcinol triazine is a mixture of two different resorcinol triazines, where at least one of the two different resorcinol tri azines is a resorcinol tri azine of the formula (I), preferably both different resorcinol tri azines are a resorcinol triazine of the formula (I).. The mixture of two different resorcinol triazines may comprise the two different resorcinol triazines in a weight ratio in the range from 5: 1 to 1 :5, preferably from 3: 1 to 1 :3, and in particular from 2:1 to 1 :2.

[0047] In another preferred form, the resorcinol triazine is a mixture of at least two different resorcinol triazines, where the mixture of the at least two different resorcinol triazines comprises the resorcinol triazines of the formula (I) and a different resorcinol triazines of the formula (ill). wherein Bi, B2, B3. B4. and B5 are independently hydrogen, Ci-Cisalkyl, Ci-C alkyl substituted by 1 , 2 or 3 radicals selected from the group consisting of -OH, C2-Ci8alkenyloxy, -C(O)OYi and -0C(0)Y2 with Y1 and Y2 being independently Ci-C alkyl; Ca-Csoalkyl interrupted by oxygen or Ca-Csohydroxyalkyl interrupted by oxygen and R1is hydrogen or -O-B5.

[0048] In another preferred form, the resorcinol triazine is a mixture of two different resorcinol triazines, where the mixture of the two different resorcinol triazines comprises the resorcinol triazines of the formula (I) and a different resorcinol triazines of the formula (III). In another preferred form, the resorcinol triazine is a mixture of two different resorcinol triazines, where the mixture of the two different resorcinol triazines comprises the resorcinol triazine of the formula (I) and a different resorcinol triazine of the formula (III), and where the weight ratio between the resorcinol triazine of the formula (I) and the different resorcinol triazine of the formula (III) is in the range from 5:1 to 1 :5, preferably from 3: 1 to 1 :3, and in particular from 2: 1 to 1 :2.

[0049] In another preferred form, the resorcinol triazine is a mixture of at least two different resorcinol triazines, where the mixture of the at least two different resorcinol triazines comprises the resorcinol triazines of the formula (la) and a different resorcinol triazines of the formula (III).

[0050] In another preferred form, the resorcinol triazine is a mixture of two different resorcinol triazines, where the mixture of the two different resorcinol triazines comprises the resorcinol triazines of the formula (la) and a different resorcinol triazines of the formula (III).

[0051] In another preferred form, the resorcinol triazine is a mixture of two different resorcinol triazines, where the mixture of the two different resorcinol triazines comprises the resorcinol triazine of the formula (la) and a different resorcinol triazine of the formula (III), and where the weight ratio between the resorcinol triazine of the formula (la) and the different resorcinol triazine of the formula (III) is in the range from 5:1 to 1 :5, preferably from 3: 1 to 1 :3, and in particular from 2: 1 to 1 :2.

[0052] In another preferred form, the resorcinol triazine is a mixture of at least two different resorcinol triazines, where the mixture of the at least two different resorcinol triazines comprises the resorcinol triazines of the formula (la) and the resorcinol triazines of the formula (lllb)

[0053] In another preferred form, the resorcinol triazine is a mixture of two different resorcinol triazines, where the mixture of the two different resorcinol triazines comprises the resorcinol triazines of the formula (la) and the resorcinol triazines of the formula (lllb). In another preferred form, the resorcinol triazine is a mixture of two different resorcinol triazines, where the mixture of the two different resorcinol triazines comprises the resorcinol triazine of the formula (la) and the resorcinol triazine of the formula (I lib), and where the weight ratio between the resorcinol triazine of the formula (la) and the resorcinol triazine of the formula (lllb) is in the range from 5:1 to 1 :5, preferably from 3: 1 to 1 :3, and in particular from 2: 1 to 1 :2.

[0054] The resorcinol triazine (e.g. a single resorcinol triazine or the sum of the mixture of at least two different resorcinol triazines) can be present in the interlayer film in an amount of less than 2.0 wt.%, preferably less than 1.0 wt.%, and in particular less than 0.6 wt.%. In this range, the resorcinol triazine maintains optimal properties for UV absorption without significantly altering the color appearance and the visual transparency of the interlayer.

[0055] The resorcinol triazine (e.g. a single resorcinol triazine or the sum of the mixture of at least two different resorcinol triazines) can be present in the interlayer film in an amount from 0.01 to 2.0 wt.%, preferably from 0.03 to 1.0 wt.%, and in particular from 0.07 to 0.6 wt.%.

[0056] The interlayer film may additionally comprise a benzotriazole-based UV absorber. The interlayer film may comprise

[0057] - the polyvinyl acetal,

[0058] - the plasticizer,

[0059] - the resorcinol triazine of formula (I), preferably the resorcinol triazine of formula (la), and

[0060] - the benzotriazole-based UV absorber.

[0061] Suitable benzotriazole-based UV absorbers are 2-(2'-hydroxyphenyl)benzotriazole derivatives, for example 2-(2‘- hydroxy-5'-methylphenyl)-benzotriazole, 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(5'-tert-butyl-2'- hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-5'-(1 ,1 ,3,3-tetramethylbutyl)phenyl)benzotriazole, 2-(3',5'-di-tert-butyl-2'- hydroxyphenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-methylphenyl)-5-chloro-benzotriazole, 2-(3'-sec- butyl-5'-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-4'-octyloxyphenyl)benzotriazole, 2-(3',5'-di-tert-amyl- 2'-hydroxyphenyl)benzotriazole, 2-(3',5'-bis-(a,a-dimethylbenzyl)-2'-hydroxyphenyl)benzotriazole, 2-(3'-tert-butyl-2'- hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl-5'-[2-(2-ethylhexyloxy)- carbonylethyl]-2'-hydroxyphenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl) phenyl)-5-chloro-benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl)phenyl) benzotriazole, 2-(3'-tert- butyl-2'-hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)benzotriazole, 2-(3'-tert-butyl-5'-[2-(2-ethylhexyloxy)carbonylethyl] -2'-hydroxyphenyl)benzotriazole, 2-(3'-dodecyl-2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy- 5'-(2-isooctyloxycarbonylethyl)phenylbenzotriazole, 2,2'-methylene-bis[4-(1 ,1 ,3,3-tetramethylbutyl)-6-benzotriazole-2- ylphenol]; the transesterification product of 2-[3'-tert-butyl-5'-(2-methoxycarbonylethyl)-2'-hydroxyphenyl]-2H- benzotriazole with polyethylene glycol 300; , where R = 3'-tert-butyl-4'- hydroxy-5'-2H-benzotriazol-2-ylphenyl, 2-[2'-hydroxy-3'-(a,a-dimethylbenzyl)-5'-(1 ,1 ,3,3-tetramethylbutyl)-phenyl]- benzotriazole; 2-[2'-hydroxy-3'-(1 ,1 ,3,3-tetramethylbutyl)-5'-(aJa-dimethylbenzyl)-phenyl]benzotriazole.

[0062] Preferably, the benzotriazole-based UV absorber is of the formula (II)

[0063] The weight ratio between the resorcinol triazines of the formula (I) (preferably the resorcinol triazines of the formula (la)) and the benzotriazole-based UV absorber can be in the range from 2:1 to 1 :6, preferably 1 :1 to 1 :5, and in particular from 1 :2 to 1 :4.

[0064] The weight ratio between the resorcinol triazines of the formula (I) (preferably the resorcinol triazines of the formula (la)) and the benzotriazole-based UV absorber of the formula (II) can be in the range from 2:1 to 1 :6, preferably 1 :1 to 1 :5, and in particular from 1 :2 to 1 :4.

[0065] The weight ratio between the resorcinol triazines of the formula (la) and the benzotriazole-based UV absorber of the formula (II) can be in the range from 2:1 to 1 :6, preferably 1 :1 to 1 :5, and in particular from 1 :2 to 1 :4.

[0066] The benzotriazole-based UV absorber can be present in the interlayer film in an amount of less than 2.0 wt.%, preferably less than 1.0 wt.%, and in particular less than 0.6 wt.%.

[0067] The benzotriazole-based UV absorber can be present in the interlayer film in an amount from 0.01 to 2.0 wt.%, preferably from 0.03 to 1 .0 wt.%, and in particular from 0.07 to 0.6 wt.%.

[0068] The following embodiments below demonstrate exceptionally high UV absorption values over time, ensuring effective protection against ultraviolet radiation. They exhibit decent mixing properties, resulting in a homogeneous interlayer that enhances overall material stability. Additionally, these embodiments maintain minimal yellowing over time, preserving their aesthetic quality.

[0069] In a preferred form the interlayer film comprises

[0070] - the polyvinyl acetal,

[0071] - the plasticizer, and

[0072] - the resorcinol triazine of formula (la). In another preferred form the interlayer film comprises

[0073] - the polyvinyl butyral,

[0074] - the plasticizer, and

[0075] - the resorcinol triazine of formula (I), wherein Ai, A2, A3 and A4 are independently hydrogen or Ci-Cisalkyl.

[0076] In another preferred form the interlayer film comprises

[0077] - the polyvinyl butyral,

[0078] - the plasticizer, and

[0079] - the resorcinol triazine of formula (I), wherein A2 is hydrogen and A1, A3 and A4 are independently Ci-Cisalkyl.

[0080] In another preferred form the interlayer film comprises

[0081] - the polyvinyl butyral,

[0082] - the plasticizer, and

[0083] - the resorcinol triazine of formula (la).

[0084] In another preferred form the interlayer film comprises

[0085] - the polyvinyl butyral,

[0086] - the plasticizer which is triethylene glycol bis (2-ethylhexanoate), and

[0087] - the resorcinol triazine of formula (la).

[0088] In another preferred form the interlayer film comprises

[0089] - the polyvinyl acetal,

[0090] - the plasticizer, and

[0091] - the resorcinol triazine of formula (la) and the resorcinol triazine of formula (lb).

[0092] In another preferred form the interlayer film comprises

[0093] - the polyvinyl butyral,

[0094] - the plasticizer, and

[0095] - the resorcinol triazine of formula (la) and the resorcinol triazine of formula (lb).

[0096] In another preferred form the interlayer film comprises

[0097] - the polyvinyl butyral,

[0098] - the plasticizer which is triethylene glycol bis (2-ethylhexanoate), and

[0099] - the resorcinol triazine of formula (la) and the resorcinol triazine of formula (lb).

[0100] In another preferred form the interlayer film comprises

[0101] - the polyvinyl butyral, - the plasticizer,

[0102] - the resorcinol triazine of formula (I), preferably the resorcinol triazine of formula (la), and

[0103] - the benzotriazole-based UV absorber, preferably the benzotriazole-based UV of the formula (II).

[0104] In another preferred form the interlayer film comprises

[0105] - the polyvinyl butyral,

[0106] - the plasticizer which is triethylene glycol bis (2-ethylhexanoate),

[0107] - the resorcinol triazine of formula (I), preferably the resorcinol triazine of formula (la), and

[0108] - the benzotriazole-based UV absorber, preferably the benzotriazole-based UV of the formula (II).

[0109] The interlayer according to the present invention may preferably comprise further components as additives.

[0110] These further additives may for example be selected from the following list:

[0111] 1 . Antioxidants

[0112] 1.1. Alkylated monophenols, for example 2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4,6-di-methylphenol, 2,6-di-tert- butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol, 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4- methylphenol, 2-(a-methylcyclohexyl)-4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol,

[0113] 2.6-di-tert-butyl-4-methoxymethyl-phenol, nonylphenols which are linear or branched in the side chains, for example

[0114] 2.6-di-nony l-4-methyl phenol , 2, 4-dimethy l-6-(1 '-methylundec- T-y l)phenol , 2, 4-dimethy l-6-(1 '-methylheptadec- T- y I) phenol , 2, 4-dimethy l-6-(1 '-methyltridec- T-y l)phenol , 2, 4-dimethy l-6-(1 '-methyl- -tetradecy l-methy l)-phenol and mixtures thereof.

[0115] 1.2. Alkylthiomethylphenols, for example 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthio-methyl-6- methylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-di-dodecyl-thiomethyl-4-nonylphenol.

[0116] 1.3. Hydroquinones and alkylated hydroquinones, for example 2,6-di-tert-butyl-4-methoxyphenol, 2,5-di-tert- butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-octadecyl-oxy-phenol, 2,6-di-tert-butylhydroquinone, 2,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenyl stearate, bis(3,5-di-tert-butyl-4-hydroxyphenyl) adipate.

[0117] 1.4. Tocopherols, for example a-tocopherol, p-tocopherol, y-tocopherol, 5-tocopherol and mixtures thereof (vitamin E), vitamin E acetate. Especially preferred is the addition of 2,5,7,8-tetramethyl-2-[4,8, 12-trimethyltridecyl]-chroman-6-ol], which is a commercially available vitamin E (e.g. Irganox E 201™). 1 .5. Hydroxylated thiodiphenyl ethers, for example 2, 2'-th I obi s(6-tert-buty l-4-methy Iphenol), 2, 2'-th I obi s(4-octy I phenol), 4,4'-thiobis(6-tert-butyl-3-methylphenol), 4,4'-thiobis(6-tert-butyl-2-methylphenol), 4,4'-thiobis(3,6-di-sec-amylphenol), 4,4'-bis(2,6-dimethyl-4-hydroxyphenyl)disulfide.

[0118] 1.6. Alkylidenebisphenols, for example 2,2'-methylenebis(6-tert-butyl-4-methylphenol), 2,2'-methylenebis(6-tert-butyl-

[0119] 4-ethylphenol), 2,2'-methylenebis[4-methyl-6-(a-methylcyclohexyl)phenol], 2,2'-methylenebis(4-methyl-6- cyclohexylphenol), 2,2'-methylenebis(6-nonyl-4-methylphenol), 2,2'-methylenebis(4,6-di-tert-butylphenol), 2,2'- ethylidenebis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis(6-tert-butyl-4-isobutylphenol), 2,2'-methylenebis[6-(a- methylbenzyl)-4-nonylphenol], 2,2'-methylenebis[6-(a,a-dimethylbenzyl)-4-nonylphenol], 4,4'-methylenebis(2,6-di-tert- butylphenol), 4,4'-methylenebis(6-tert-butyl-2-methylphenol), 1 , 1-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, 2,6-bis(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenol, 1,1,3-tris(5-tert-butyl-4-hydroxy-2- methylphenyl)butane, 1 , 1 -bis(5-tert-butyl-4-hydroxy-2-methylphenyl)-3-n-dodecylmercaptobutane, ethylene glycol bis[3,3-bis(3'-tert-butyl-4'-hydroxyphenyl)butyrate], bis(3-tert-butyl-4-hydroxy-5-methyl-phenyl)dicyclopentadiene, bis[2-(3'-tert-butyl-2'-hydroxy-5'-methylbenzyl)-6-tert-butyl-4-methylphenyl]terephthalate, 1 ,1-bis-(3,5-dimethyl-2- hydroxyphenyl)butane, 2,2-bis(3,5-di-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis-(5-tert-butyl-4-hydroxy-2-methyl- phenyl)-4-n-dodecylmercaptobutane, 1, 1 ,5,5-tetra(5-tert-butyl-4-hydroxy-2-methylphenyl)pentane.

[0120] 1.7. O-, N- and S-benzyl compounds, for example 3,5,3',5'-tetra-tert-butyl-4,4'-dihydroxydibenzyl ether, octadecyl-4- hydroxy-3,5-dimethylbenzylmercaptoacetate, tridecyl-4-hydroxy-3,5-di-tert-butylbenzylmercaptoacetate, tris(3,5-di- tert-butyl-4-hydroxybenzyl)amine, bis(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithioterephthalate, bis(3,5-di-tert- butyl-4-hydroxybenzyl)sulfide, isooctyl-3,5-di-tert-butyl-4-hydroxybenzylmercaptoacetate.

[0121] 1.8. Hydroxybenzylated malonates, for example dioctadecyl-2, 2-bis(3,5-di-tert-butyl-2-hydroxybenzyl)malonate, di- octadecyl-2-(3-tert-butyl-4-hydroxy-5-methylbenzyl)malonate, di-dodecylmercaptoethyl-2,2-bis(3,5-di-tert-butyl-4- hydroxybenzyl)malonate, bis[4-(1 ,1 ,3,3-tetramethylbutyl)phenyl]-2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.

[0122] 1.9. Aromatic hydroxybenzyl compounds, for example 1 ,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6- trimethylbenzene, 1 ,4-bis(3,5-di-tert-butyl-4-hydroxybenzyl)-2,3,5,6-tetramethylbenzene, 2,4,6-tris(3,5-di-tert-butyl-4- hydroxybenzyl)phenol.

[0123] 1.10. Additional Triazine compounds, for example 2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5- triazine, 2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyanilino)-1 ,3,5-triazine, 2-octylmercapto-4,6-bis(3,5-di-tert- butyl-4-hydroxyphenoxy)-1 , 3, 5-triazi ne, 2, 4, 6-tris(3, 5-di-tert-buty l-4-hydroxy phenoxy )- 1 , 2, 3-triazi ne, 1 ,3, 5-tris(3, 5-di- tert-butyl-4-hydroxybenzyl)isocyanurate, 1 ,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 2,4,6- tris(3,5-di-tert-butyl-4-hydroxyphenylethyl)-1 ,3,5-triazine, 1 ,3,5-tris(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)-hexa- hydro-1 ,3,5-triazine, 1 , 3, 5-tris(3, 5-dicyclohexyl-4-hydroxy benzyl )isocy an urate. 1.11. Benzylphosphonates, for example dimethyl-2,5-di-tert-butyl-4-hydroxybenzylphosphonate, diethyl-3, 5-di-tert- butyl-4-hydroxybenzylphosphonate, dioctadecyl-3, 5-di-tert-butyl-4-hydroxybenzylphosphonate, dioctadecyl-5-tert- butyl-4-hydroxy-3-methylbenzylphosphonate, the calcium salt of the monoethyl ester of 3,5-di-tert-butyl-4- hydroxybenzylphosphonic acid, (3,5-ditert-butyl-4-hydroxy-phenyl)methylphosphonic acid.

[0124] 1.12. Acylaminophenols, for example 4-hydroxylauranilide, 4-hydroxystearanilide, octyl N-(3,5-di-tert-butyl-4- hydroxyphenyl)carbamate.

[0125] 1.13. Esters of p-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, for example with methanol, ethanol, n-octanol, i-octanol, a mixture of linear and branched Cz-Cg-alkanol, octadecanol, a mixture of linear and branched Ci3-Ci5-alkanol, 1 ,6-hexanediol, 1 ,9-nonanediol, ethylene glycol, 1 ,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaerythritol, tris- (hydroxyethyl)isocyanurate, N,N'-bis-(hydroxy-ethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.

[0126] Preferred are esters of p-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, especially with octadecanol, such as the addition of Octadecyl-3-(3,5-di-tert.butyl-4-hydroxyphenyl)-propionate, which is a commercially available as e.g. Irganox 1076™.

[0127] 1.14. Esters of p-(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acid with mono- or polyhydric alcohols, for example with methanol, ethanol, n-octanol, i-octanol, octadecanol, 1 ,6-hexanediol, 1 ,9-nonanediol, ethylene glycol, 1 ,2- propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris- (hydroxyethyl)isocyanurate, N,N'-bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane; 3,9-bis[2-{3-(3- tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}-1 ,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane.

[0128] 1.15. Esters of p-(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid with mono- or polyhydric alcohols, for example with methanol, ethanol, octanol, octadecanol, 1 ,6-hexanediol, 1 ,9-nonanediol, ethylene glycol, 1 ,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N'- bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxy- methyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.

[0129] 1.16. Esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono- or polyhydric alcohols, for example with methanol, ethanol, octanol, octadecanol, 1 ,6-hexanediol, 1 ,9-nonanediol, ethylene glycol, 1 ,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, tris(hydroxyethyl)isocyanurate, N,N'- bis(hydroxyethyl)oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4- hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane. 1.17. Amides of p-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, for example

[0130] N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylenediamide, N,N'-bis(3,5-di-tert-butyl-4- hydroxyphenylpropionyl)trimethylenediamide, N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazide, N,N'- bis[2-(3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionyloxy)ethyl]oxamide (Naugard XL-1 (RTM), supplied by SI Group).

[0131] 1.18. Ascorbic acid (vitamin C)

[0132] 1.19. Aminic antioxidants, for example N,N'-di-isopropyl-p-phenylenediamine, N,N'-di-sec-butyl-p-phenylenediamine, N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine, N,N'-bis(1-ethyl-3-methylpentyl)-p-phenylenediamine, N,N'-bis(1- methylheptyl)-p-phenylenediamine, N,N'-dicyclohexyl-p-phenylenediamine, N,N'-diphenyl-p-phenylenediamine, N,N'- bis(2-naphthyl)-p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p- phenylenediamine, N-(1-methylheptyl)-N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, 4-(p-toluenesulfamoyl)diphenylamine, N,N'-dimethyl-N,N'-di-sec-butyl-p-phenylenediamine, diphenylamine, N- allyldiphenylamine, 4-isopropoxydiphenylamine, N-phenyl-1-naphthylamine, N-(4-tert-octylphenyl)-1-naphthylamine, N-phenyl-2-naphthylamine, octylated diphenylamine, for example p,p'-di-tert-octyldiphenylamine, 4-n- butylaminophenol, 4-butyrylaminophenol, 4-nonanoylaminophenol, 4-dodecanoylaminophenol, 4-octadecanoylamino- phenol, bis(4-methoxyphenyl)amine, 2,6-di-tert-butyl-4-dimethylaminomethylphenol, 2,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, N,N,N',N'-tetramethyl-4,4'-diaminodiphenylmethane, 1 ,2-bis[(2-methylphenyl)amino]- ethane, 1,2-bis(phenylamino)propane, (o-tolyl)biguanide, bis[4-(T,3'-dimethylbutyl)phenyl]amine, tert-octylated N- phenyl-1 -naphthylamine, a mixture of mono- and dialkylated tert-butyl / tert-octyldiphenylamines, a mixture of mono- and dialkylated nonyldiphenylamines, a mixture of mono- and dialkylated dodecyldiphenylamines, a mixture of mono- and dialkylated isopropyl / isohexyldiphenylamines, a mixture of mono- and dialkylated tert-butyldiphenylamines, 2,3- dihydro-3,3-dimethyl-4H-1,4-benzothiazine, phenothiazine, a mixture of mono- and dialkylated tert-butyl / tert- octylphenothiazines or a mixture of mono- and dialkylated tert-octylphenothiazines, N-allylphenothiazine, N,N,N',N'- tetraphenyl-1 ,4-diaminobut-2-ene, N-[(1,1,3,3-tetramethylbutyl)phenyl]-1-napthalenamine] (commercially available as Irganox L06™), 4,4’-bis(phenylisopropyl)diphenylamine (commercially available as Naugard 445), Bis(4-(1, 1,3,3- tetramethylbutyl)phenyl)amine (commercially available as Irganox 5057).

[0133] 2. Additional light stabilizers

[0134] 2.1. 2-Hydroxybenzophenones, for example the 4-hydroxy, 4-methoxy, 4-octyloxy, 4-decyloxy, 4-dodecyloxy, 4- benzyloxy, 4,2',4'-trihydroxy and 2'-hydroxy-4,4'-dimethoxy derivatives.

[0135] 2.2. Esters of substituted and unsubstituted benzoic acids, for example 4-tert-buty Iphenyl salicylate, phenyl salicylate, octylphenyl salicylate, dibenzoyl resorcinol, bis(4-tert-butylbenzoyl)resorcinol, benzoyl resorcinol, 2,4-di-tert- butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl 3,5-di-tert- butyl-4-hydroxybenzoate, 2-methyl-4,6-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate. 2.3. Acrylates, for example ethyl a-cyano-Dp,p-diphenylacrylate, isooctyl a-cyano-Dp,p-diphenylacrylate, methyl a- carbomethoxycinnamate, methyl o-cyano-p-methyl-p-methoxycinnamate, butyl o-cyano-p-methyl-p- methoxycinnamate, methyl o-carbomethoxy-p-methoxycinnamate, N-(p-carbomethoxy-p-cyanovinyl)-2-methylindoline and neopentyl tetra(o-cyano-, p-diphenylacrylate), or sterically hindered acrylates such as disclosed in EP-A-3587425, like for instance (2E,2'E)-2,4,8, 10-tetraoxaspiro[5.5]undecane-3,9-diylbis(2-methylpropane-2, 1-diyl) bis(2-cyano-3- (3,4-dimethoxyphenyl)acrylate) [CAS Reg. No. 2233585-18-5], or a similar derivative, wherein the one of the two OCH3 groups (methoxy) of each of the (2-cyano-3-(3,4-dimethoxyphenyl)acrylate)moiety is respectively substituted with a OCeH group, resulting in a bis(2-cyano-3-(3-methoxy-4-hexyloxyphenyl)acrylate) derivative.

[0136] 2.4. Nickel compounds, for example nickel complexes of 2,2'-thiobis[4-(1 , 1,3,3-tetramethylbutyl)phenol], such as the 1 : 1 or 1 :2 complex, with or without additional ligands such as n-butylamine, triethanolamine or N- cyclohexyldiethanolamine, nickel dibutyldithiocarbamate, nickel salts of the monoalkyl esters, e.g. the methyl or ethyl ester, of 4-hydroxy-3, 5-di-tert-buty Ibenzy Iphosphonic acid, nickel complexes of ketoximes, e.g. of 2-hydroxy-4-methyl- phenylundecylketoxime, nickel complexes of 1 -phenyl-4-lauroyl-5-hydroxypyrazole, with or without additional ligands.

[0137] 2.5. Oxamides, for example 4,4'-dioctyloxyoxanilide, 2,2'-diethoxyoxanilide, 2,2'-dioctyloxy-5,5'-di-tert-butoxanilide, 2,2'-didodecyloxy-5,5'-di-tert-butoxanilide, 2-ethoxy-2'-ethyloxanilide, N,N'-bis(3-dimethylaminopropyl)oxamide, 2- ethoxy-5-tert-butyl-2'-ethoxanilide and its mixture with 2-ethoxy-2'-ethyl-5,4'-di-tert-butoxanilide, mixtures of 0- and p- methoxy-disubstituted oxanilides and mixtures of 0- and p-ethoxy-disubstituted oxanilides.

[0138] 2.6. Sterically hindered amines, for example bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(2,2,6,6-tetramethyl-4- pi peridy l)succin ate, bis(1 , 2,2, 6, 6-pentamethy l-4-pi peri dy I )sebacate, bis(1 , 2,2, 6, 6-pentamethy l-4-pi peridy I) n-butyl-3,5- di-tert-butyl-4-hydroxybenzylmalonate, the condensate of 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid, linear or cyclic condensates of N, N'-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine, tris(2,2,6,6-tetramethyl-4-piperidyl)nitrilotriacetate, tetrakis(2, 2,6,6- tetramethyl-4-piperidyl)-1 ,2,3,4-butanetetracarboxylate, 1 ,T-(1 ,2-ethanediyl)-bis(3,3,5,5-tetramethylpiperazinone), 4- benzoyl-2,2,6,6-tetramethylpiperidine, 4-stearyloxy-2,2,6,6-tetramethylpiperidine, bis(1, 2,2,6, 6-pentamethylpiperidyl)-

[0139] 2-n-butyl-2-(2-hydroxy-3,5-di-tert-butylbenzyl)malonate, 3-n-octyl-7,7,9,9-tetramethyl-1 ,3,8-triazaspiro[4.5]decane- 2, 4-dione, bis(1-octyloxy-2,2,6,6-tetramethylpiperid-4-yl)sebacate, bis(1-octyloxy-2,2,6,6-tetramethylpiperid-4- yl)succinate, bis-[2,2,6,6-tetramethyl-1-(undecyloxy)-piperidin-4-yl] carbonate, linear or cyclic condensates of N,N'- bis(2, 2, 6,6-tetramethy l-4-piperidy l)-hexamethy lened i ami ne and 4-morphol ino-2, 6-dichloro- 1 , 3,5-tri azi ne, the condensate of 2-chloro-4,6-bis(4-n-butylamino-2,2,6,6-tetramethylpiperidyl)-1 ,3,5-triazine and 1 ,2-bis(3-aminopropyl- amino)ethane, the condensate of 2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine and 1,2-bis(3-aminopropyl-amino)ethane, 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1 , 3, 8-triazaspiro[4.5]decane-2, 4-dione,

[0140] 3-dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)pyrrolidine-2,5-dione, 3-dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)- pyrrolidine-2, 5-dione, a mixture of 4-hexadecyloxy- and 4-stearyloxy-2,2,6,6-tetramethylpiperidine, a condensate of N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-cyclohexylamino-2,6-dichloro-1 ,3,5-triazine, a condensate of 1 ,2-bis(3-aminopropylamino)ethane and 2,4,6-trichloro-1 ,3,5-triazine as well as 4-butylamino-2, 2,6,6- tetramethylpiperidine (CAS Reg. No. [136504-96-6]); a condensate of 1 ,6-hexanediamine and 2,4,6-trichloro-1 ,3,5- triazine as well as N,N-dibutylamine and 4-butylamino-2,2,6,6-tetramethylpiperidine (CAS Reg. No. [192268 64-7]); reaction products of N6,N6'-hexane-1 ,6-diylbis[N2,N4-dibutyl-N2,N4,N6-tris(2,2,6,6-tetramethylpiperidin-4-yl)-1 ,3,5- triazine-2,4,6-triamine], butanal and hydrogen peroxide; N-(2,2,6,6-tetramethyl-4-piperidyl)-n-dodecylsuccinimide, N- (1 ,2,2,6,6-pentamethyl-4-piperidyl)-n-dodecylsuccinimide, 2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxo-spiro-

[0141] [4.5]decane, a reaction product of 7,7,9,9-tetramethyl-2-cycloundecyl-1-oxa-3,8-diaza-4-oxospiro-[4,5]decane and epichlorohydrin, 1 , 1-bis(1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl)-2-(4-methoxyphenyl)-ethene, N,N'-bis-formyl- N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine, a diester of 4-methoxymethylenemalonic acid with 1 ,2,2,6,6-pentamethyl-4-hydroxy-piperidine, poly[methylpropyl-3-oxy-4-(2,2,6,6-tetramethyl-4-piperidyl)]siloxane, a reaction product of maleic acid anhydride-a-olefin copolymer with 2,2,6,6-tetramethyl-4-aminopiperidine or 1 , 2, 2,6,6- pentamethyl-4-aminopiperidine, a mixture of oligomeric compounds which are the formal condensation products of N,N'-bis-(2,2,6,6-tetramethyl-1-propoxy-piperidin-4-yl)-hexane-1 ,6-diamine and 2,4-dichloro-6-{n-butyl-(2,2,6,6- tetramethyl-1-propoxy-piperidin-4-yl)-amino}-[1,3,5]triazine end-capped with 2-chloro-4,6-bis-(di-n-butylamino)-

[0142] [1.3.5]triazine, a mixture of oligomeric compounds which are the formal condensation products of N, N'-bis-(2, 2,6,6- tetramethyl-piperidin-4-yl)-hexane-1 ,6-diamine and 2,4-dichloro-6-{n-butyl-(2,2,6,6-tetramethyl-piperidin-4-yl)-amino}-

[0143] [1.3.5]triazine end-capped with 2-chloro-4,6-bis-(di-n-butylamino)-[1 ,3,5]triazine, (N2,N4-dibutyl-N2,N4-bis(1,2,2,6,6- pentamethyl-4-piperidinyl)-6-(1-pyrrolidinyl)-[1,3,5]-triazine-2,4-diamine, 2,4-bis[N-(1-cyclohexyloxy-2,2,6,6-tetra- methylpiperidine-4-yl)-N-butylamino]-6-(2-hydroxyethyl)amino-1 ,3,5-triazine, 1-(2-hydroxy-2-methylpropoxy)-4-octa- decanoyloxy-2,2,6,6-tetramethylpiperidine, 5-(2-ethylhexanoyl)oxymethyl-3,3,5-trimethyl-2-morpholinone, Sanduvor (Clariant; CAS Reg. No. [106917-31-1]), 5-(2-ethylhexanoyl)-oxymethyl-3,3,5-trimethyl-2-morpholinone, the reaction product of 2,4-bis-[(1-cyclo-hexyloxy-2,2,6,6-piperidine-4-yl)butylamino]-6-chloro-s-triazine with N,N'-bis-(3-amino- propy l)ethy lenediam i ne), 1 , 3, 5-tris(N-cy clohexy I- N-(2,2, 6, 6-tetramethy l-pi perazi ne-3-one-4-y l)ami no)-s-tri azi ne, 1 ,3,5- tris(N-cyclohexyl-N-(1 ,2,2,6,6-pentamethylpiperazine-3-one-4-yl)-amino)-s-triazine.

[0144] 2.7. 2-(2'-Hydroxyphenyl)benzotriazoles, for example 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(3',5'-di-tert- butyl-2'-hydroxyphenyl)benzotriazole, 2-(5'-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-5'-(1 , 1 ,3,3- tetramethylbutyl)phenyl)benzotriazole, 2-(3',5'-di-tert-butyl-2'-hydroxyphenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-2'- hydroxy-5'-methylphenyl)-5-chlorobenzotriazole, 2-(3'-sec-butyl-5'-tert-butyl-2'-hydroxyphenyl)benzotriazole, 2-(2‘- hydroxy-4'-octyloxyphenyl)benzotriazole, 2-(3',5'-di-tert-amyl-2'-hydroxyphenyl)benzotriazole, 2-(3',5'-bis(a, a- dimethylbenzyl)-2'-hydroxyphenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)-5- chlorobenzotriazole, 2-(3'-tert-butyl-5'-[2-(2-ethylhexyloxy)carbonylethyl]-2'-hydroxyphenyl)-5-chlorobenzotriazole, 2- (3'-tert-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl)phenyl)-5-chlorobenzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2- methoxycarbonylethyl)phenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-octyloxycarbonylethyl)phenyl)benzotri- azole, 2-(3'-tert-butyl-5'-[2-(2-ethylhexyloxy)carbonylethyl]-2'-hydroxyphenyl)benzotriazole, 2-(3'-dodecyl-2'-hydroxy- 5'-methylphenyl)benzotriazole, 2-(3'-tert-butyl-2'-hydroxy-5'-(2-isooctyloxycarbonylethyl)phenylbenzotriazole, 2,2'- methylenebis[4-(1 , 1 ,3,3-tetramethylbutyl)-6-benzotriazole-2-ylphenol]; the transesterification product of 2-[3'-tert-butyl- 5'-(2-methoxycarbonylethyl)-2'-hydroxyphenyl]-2H-benzotriazole with polyethylene glycol 300.

[0145] 2.8. Additional 2-(2-Hydroxyphenyl)-1 ,3,5-triazines, for example 2,4,6-tris(2-hydroxy-4-octyloxyphenyl)-1 ,3,5-triazine, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1 ,3,5-triazine, 2-(2,4-dihydroxyphenyl)-4,6-bis(2,4- dimethy l-pheny I)- 1 ,3,5-triazine, 2, 4-bis(2-hyd roxy-4-propy loxypheny l)-6-(2, 4-d I methyl phenyl)- 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- dimethy l-pheny I)- 1 ,3,5-triazine, 2- (2-hyd roxy-4-tridecy loxypheny l)-4, 6-bis(2,4-dimethyl phenyl)- 1 ,3,5-triazine, 2-[2- hydroxy-4-(2-hydroxy-3-butyloxypropoxy)phenyl]-4,6-bis(2,4-dimethyl)-1,3,5-triazine, 2-[2-hydroxy-4-(2-hydroxy-3- octyloxypropyl-oxy)phenyl]-4,6-bis(2,4-dimethyl)-1 ,3,5-triazine, 2-[4-(dodecyloxy / tridecyloxy-2-hydroxypropoxy)-2- hydroxy-phenyl]-4,6-bis(2,4-dimethylphenyl)-1 ,3,5-triazine, 2-[2-hydroxy-4-(2-hydroxy-3-dodecyloxypropoxy)phenyl]- 4, 6-bis-(2,4-d i methy Ipheny I)- 1 ,3,5-triazine, 2- (2-hyd roxy-4-hexyloxy)pheny I-4, 6-d i phenyl- 1 ,3,5-triazine, 2-(2-hydroxy- 4-methoxy-phenyl)-4,6-diphenyl-1,3,5-triazine, 2,4,6-tris[2-hydroxy-4-(3-butoxy-2-hydroxypropoxy)phenyl]-1 ,3,5- triazine, 2-(2-hydroxyphenyl)-4-(4-methoxyphenyl)-6-phenyl-1 ,3,5-triazine, 2-[4, 6-bis({[1 , 1 '-bipheny l]-4-y I})- 1 ,3,5- triazin-2-yl]-5-[(2-ethylhexyl)oxy]phenol (CAS Number: 204583-39-1), 2-{2-hydroxy-4-[3-(2-ethylhexyl-1-oxy)-2- hydroxy-propyloxy]phenyl}-4,6-bis(2,4-dimethylphenyl)-1 ,3,5-triazine.

[0146] 3. Metal deactivators, for example N,N'-diphenyloxamide, N-salicylal-N'-salicyloyl hydrazine, N,N'- bis(salicyloyl)hydrazine, N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazine, 3-salicyloylamino-1 ,2,4- triazole, bis(benzylidene)oxalyl dihydrazide, oxanilide, isophthaloyl dihydrazide, sebacoyl bisphenylhydrazide, N,N'- diacetyladipoyl dihydrazide, N,N'-bis(salicyloyl)oxalyl dihydrazide, N,N'-bis(salicyloyl)thiopropionyl dihydrazide N,N'- bis[2-(3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionyloxy)ethyl]oxamide (Naugard XL-1 (RTM), supplied by SI Group).

[0147] 4. Phosphites and phosphonates such as Tris-alkyl (C12-C15) phosphite, Triisodecyl phosphite, Triisotridecyl phosphite, Dioleyl Hydrogen phosphite, Triisooctyl Phosphite, Heptakis (dipropyleneglycol) Triphosphite, Trilauryl Trithio Phosphite, Tris (Dipropyleneglycol) Phosphite, Dimethyl hydrogen phosphite, Dibutyl hydrogen phosphite, Dilauryl hydrogen phosphite, Tri-Ci2-Ci4-phosphite or Bis(2-ethylhexyl) hydrogen phosphite. Other phosphites and phosphonates, which are for instance liquid ones such as Di-n-octyl hydrogen phosphite or Di-iso-octyl hydrogen phosphite, or for example triphenyl phosphite, tris(nonylphenyl) phosphite, Phenyldiisodecyl phosphite, Diphenylisodecyl phosphite, [Triphenyl phosphite, polymer with 1 ,4-cyclohexanedimethanol and polypropylene glycol, Cio-i6alkyl esters (CAS Reg. No. 1821217-71-3)].

[0148] Further optional phosphites or phosphonates additives are for instance Alkyl (C12-C15) bisphenol A phosphite, Alkyl (C10) bisphenol A phosphite, Poly (dipropyleneglycol) phenyl phosphite, Tris (tridecyl) phosphite, Diphenyl phosphite, Dodecyl nonylphenol phosphite blend, Phenyl Neopentylene Glycol Phosphite, Poly 4,4' Isopropylidenediphenol - C10 Alcohol Phosphite, Poly 4,4' Isopropylidenediphenol - Ci2-i5Alcohol Phosphite, diphenylalkyl phosphites, phenyldialkyl phosphites, Ci2-Ci8alkyl bis[4-(1-methyl-1-phenyl-ethyl)phenyl] phosphite, Ci2-Ci8alkenyl bis[4-(1-methyl-1-phenyl- ethyl)phenyl] phosphite, bis[4-(1-methyl-1-phenyl-ethyl)phenyl] [(E)-octadec-9-enyl] phosphite, decyl bis[4-(1-methyl- 1-phenyl-ethyl)phenyl] phosphite, didecyl [4-(1-methyl-1-phenyl-ethyl)phenyl] phosphite, [4-(1-methyl-1-phenyl- ethyl)phenyl] bis[(E)-octadec-9-enyl] phosphite, trilauryl phosphite, trioctadecyl phosphite, distearylpentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, diisodecyl pentaerythritol diphosphite, bis(2,4-di-tert- butylphenyl)pentaerythritol diphosphite, bis(2,4-di-cumylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4- methylphenyl)pentaerythritol diphosphite, diisodecyloxypentaerythritol diphosphite, bis(2,4-di-tert-butyl-6- methylphenyl)pentaerythritol diphosphite, bis(2,4,6-tris(tert-butylphenyl)pentaerythritol diphosphite, [2-tert-butyl-4-[1- [5-tert-butyl-4-di(tridecoxy)phosphanyloxy-2-methyl-phenyl]butyl]-5-methyl-phenyl] ditridecyl phosphite, tristearyl sorbitol triphosphite, a mixture of at least two different tris(mono-Ci-C8-alkyl)phenyl phosphites such as for example mentioned in US 7468410 B2 as products of examples 1 and 2, a mixture of phosphites comprising at least two different tris(amylphenyl) phosphites such as for example mentioned in US 8008383 B2 as mixtures 14, 15, 16, 17, 18, 19, 20, 21 , 22, 23, 24, 25 and 26, a mixture of a least four different phosphites comprising tris[4-(1 , 1-dimethylpropyl)phenyl] phosphite, [2,4-bis(1 ,1-dimethylpropyl)phenyl] bis[4-(1 , 1-dimethylpropyl)phenyl] phosphite, bis[2,4-bis(1 ,1- dimethylpropyl)phenyl] [4-(1 , 1-dimethylpropyl)phenyl] phosphite and tris[2,4-bis(1 , 1 -dimethylpropyl)phenyl] phosphite, a mixture of phosphites comprising at least two different tris(buty Ipheny I) phosphites such as for example mentioned in US 8008383 B2 as mixtures 34, 35, 36, 37, 38, 39 and 40, an oxyalkylene-bridged bis-(di-C6-aryl) diphosphite or an oligomeric phosphite obtainable by condensation under removal of hydrogen chloride of (I) a trichlorophosphane, with (ii) a dihydroxyalkane interrupted by one or more oxygen atoms and with (ill) a mono-hydroxy-Ce-arene such as for example mentioned in US 8304477 B2 as products of examples 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15, 16 and 17, a polymeric phosphite obtainable by transesterification under removal of phenol of (I) triphenyl phosphite with (ii) a dihydroxyalkane optionally interrupted by one or more oxygen atoms and / or a bis(hydroxyalkyl)(alkyl)amine and with (ill) a mono-hydroxyalkane optionally interrupted by one or more oxygen atoms such as for example mentioned in US 8563637 B2 as products of examples 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11 , tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylene diphosphonite, 6-isooctyloxy-2,4,8,10-tetra-tert-butyl-12H-dibenz[d,g]-1 ,3,2-dioxaphosphocine, bis(2,4-di-tert-butyl-6- methylphenyl)methylbis(2,4-di-tert-butyl-6-methylphenyl)methyl phosphite, bis(2,4-di-tert-butyl-6-methylphenyl)ethyl phosphite, 6-fluoro-2,4,8,10-tetra-tert-butyl-12-methyl-dibenz[d,g]-1,3,2-dioxaphosphocine, 1 ,3,7,9-tetra-tert-butyl-11- octoxy-5H-benzo[d][1 ,3,2]benzodioxaphosphocine, 2,2',2"-nitrilo[triethyltris(3,3',5,5'-tetra-tert-butyl-1 ,T-biphenyl-2,2'- diyl)phosphite], phosphorous acid, triphenyl ester, polymer with a-hydro-co-hydroxypoly[oxy(methyl-1 ,2-ethanediyl)], C10-16-alkyl esters (CAS Reg. No. [1227937-46-3]), 2-ethylhexyl(3,3,J5,5,-tetra-tert-butyl-1,T-biphenyl-2,2’- diyl)phosphite, 5-butyl-5-ethyl-2-(2,4,6-tri-tert-butylphenoxy)-1 ,3,2-dioxaphosphirane, phosphorous acid, mixed 2,4- bis(1 , 1-dimethylpropyl)phenyl and 4-(1 , 1-dimethylpropyl)phenyl triesters (CAS Reg. No. [939402-02-5]).

[0149] The following phosphites are especially preferred:

[0150] Tris(2,4-di-tert-butylphenyl) phosphite (Irgafos® 168, Ciba Specialty Chemicals Inc.), tris(nonylphenyl) phosphite,

[0151]

[0152] 5. Hydroxylamines and amine N-oxides, for example N,N-dibenzylhydroxylamine, N,N-diethylhydroxylamine, N,N- dioctylhydroxylamine, N,N-dilaurylhydroxylamine, N,N-ditetradecylhydroxylamine, N,N-dihexadecylhydroxylamine, N,N-dioctadecylhydroxylamine, N-hexadecyl-N-octadecylhydroxylamine, N-heptadecyl-N-octadecylhydroxylamine, N, N-dialkylhydroxylamine derived from hydrogenated tallow amine , N,N-bis-(hydrogenated rape-oil alkyl)-N-methyl- amine N-oxide or trialkylamine N-oxide. 6. Nitrones, for example N-benzyl-alpha-phenylnitrone, N-ethyl-alpha-methylnitrone, N-octyl-alpha-heptylnitrone, N- lauryl-alpha-undecylnitrone, N-tetradecyl-alpha-tridecylnitrone, N-hexadecyl-alpha-pentadecylnitrone, N-octadecyl- alpha-heptadecylnitrone, N-hexadecyl-alpha-heptadecylnitrone, N-octadecyl-alpha-pentadecylnitrone, N-heptadecyl- alpha-heptadecylnitrone, N-octadecyl-alpha-hexadecylnitrone, nitrone derived from N, N-dialkylhydroxylamine derived from hydrogenated tallow amine.

[0153] 7. Thiosynergists, for example dilauryl thiodipropionate, dimistryl thiodipropionate, distearyl thiodipropionate and pentaerythritol tetrakis-[3-(n-lauryl)-propionic acid ester],

[0154] 8. Peroxide scavengers, for example esters of o-thiodipropionic acid, for example the lauryl, stearyl, myristyl or tridecyl esters, mercaptobenzimidazole or the zinc salt of 2-mercaptobenzimidazole, zinc dibutyldithiocarbamate, dioctadecyl disulfide, pentaerythritol tetrakis(|3-dodecylmercapto)propionate.

[0155] 9. Acid scavengers, for example melamine, polyvinylpyrrolidone, dicyandiamide, triallyl cyanurate, urea derivatives, hydrazine derivatives, alkali metal salts and alkaline earth metal salts of higher fatty acids, for example calcium stearate, zinc stearate, magnesium behenate, magnesium stearate, sodium ricinoleate and potassium palmitate, antimony pyrocatecholate and zinc pyrocatecholate.

[0156] 10. Basic co-stabilizers, for example melamine, polyvinylpyrrolidone, dicyandiamide, triallyl cyanurate, urea derivatives, hydrazine derivatives, amines, polyamides, polyurethanes, alkali metal salts and alkaline earth metal salts of higher fatty acids, for example calcium stearate, zinc stearate, magnesium behenate, magnesium stearate, sodium ricinoleate and potassium palmitate, antimony pyrocatecholate or zinc pyrocatecholate.

[0157] 11. Nucleating agents, for example inorganic substances, such as talcum, metal oxides, such as titanium dioxide or magnesium oxide, phosphates, carbonates or sulfates of, preferably, alkaline earth metals; organic compounds, such as mono- or polycarboxylic acids and the salts thereof, e.g. 4-tert-butylbenzoic acid, adipic acid, diphenylacetic acid, sodium succinate or sodium benzoate; polymeric compounds, such as ionic copolymers (ionomers). Especially preferred are 1 ,3:2,4-bis(3',4'-dimethylbenzylidene)sorbitol, 1 ,3:2,4-di(paramethyldibenzylidene)sorbitol, and 1 , 3:2,4- di(benzylidene)sorbitol.

[0158] 12. Fillers and reinforcing agents, for example calcium carbonate, silicates, glass fibres, glass beads, asbestos, talc, kaolin, mica, barium sulfate, metal oxides and hydroxides, carbon black, graphite, wood flour and flours or fibers of other natural products, synthetic fibers.

[0159] 13. Other additives, for example lubricants, emulsifiers, pigments, rheology additives, catalysts, flow-control agents, optical brighteners, flameproofing agents, antistatic agents and blowing agents.

[0160] 14. Benzofuranones and indolinones, for example those disclosed in US-A-4,325,863; US A-4,338,244; US-A- 5, 175,312; US-A-5, 216,052; US-A-5,252,643; DE-A-4316611 ; DE-A-4316622; DE-A-4316876; EP-A-0589839 or EP- A-0591102, or 5,7-di-tert-butyl-3-(4-hydroxyphenyl)-3H-benzofuran-2-one, 5,7-di-tert-butyl-3-[4-(2- hydroxyethoxy)phenyl]-3H-benzofuran-2-one, 5,7-di-tert-butyl-3-[4-[2-[2-[2-[2-(2-hydroxyethoxy)ethoxy]ethoxy]- ethoxy]ethoxy]phenyl]-3H-benzofuran-2-one, 3-[4-(2-acetoxyethoxy)phenyl]-5,7-di-tert-butylbenzofuran-2-one, 5,7-di- tert-butyl-3-[4-(2-stearoyloxyethoxy)phenyl]benzofuran-2-one, 3,3'-bis[5,7-di-tert-butyl-3-(4-[2-hydroxyethoxy]- phenyl)benzofuran-2-one], 5,7-di-tert-butyl-3-(4-ethoxyphenyl)benzofuran-2-one, 3-(4-acetoxy-3,5-dimethylphenyl)- 5,7-di-tert-butylbenzofuran-2-one, 3-(3,5-dimethyl-4-pivaloyloxyphenyl)-5,7-di-tert-butylbenzofuran-2-one, 3-(3,4- dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one, 3-(2,3-dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one, 3-(2- acetoxy-4-(1 ,1 ,3,3-tetramethyl-butyl)-phenyl)-5-(1 ,1 ,3,3-tetramethyl-butyl)-benzofuran-2-one, [6-[6-[6-[2-[4-(5,7-di- tert-butyl-2-oxo-3H-benzofuran-3-yl)phenoxy]ethoxy]-6-oxo-hexoxy]-6-oxo-hexoxy]-6-oxo-hexyl] 6-hydroxyhexanoate, [4-tert-butyl-2-(5-tert-butyl-2-oxo-3H-benzofuran-3-yl)phenyl] benzoate, [4-tert-butyl-2-(5-tert-butyl-2-oxo-3H-benzo- furan-3-yl)phenyl] 3,5-di-tert-butyl-4-hydroxy-benzoate and [4-tert-butyl-2-(5-tert-butyl-2-oxo-3H-benzofuran-3- yl)phenyl] 3-(3,5-di-tert-butyl-4-hydroxy-phenyl)propanoate.

[0161] Examples

[0162] HALS-1 : a hindered amine light stabilizer, N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-N,N'- diformylhexamethylenediamine.

[0163] AO-1 : a sterically hindered phenolic antioxidant, benzenepropanoic acid, 3-(1,1-dimethylethyl)-4-hydroxy-5- methyl-, 1 ,1'-[1 ,2-ethanediylbis(oxy-2,1 -ethanediyl)] ester

[0164] Tinuvin® 326: a benzotriazol UV absober, 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1 , 1 -dimethylethyl)-4-methyl.

[0165] UVA-1 : 2,2'-[6-(4-methoxyphenyl)-1 , 3, 5-tri azi ne-2, 4-d iy I] bis[5-[(2-ethy lhexy l)oxy] phenol

[0166] UVA-2: 5-butoxy-2-[4-(4-butoxy-2-hydroxyphenyl)-6-(2,4-dibutoxyphenyl)-1 ,3,5-triazin-2-yl]phenol

[0167] UVA-3: 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1 ,1,3,3-tetramethylbutyl)-phenol

[0168] UVA-4: Propanoic acid, 2-[4-[4,6-bis([1 ,T-biphenyl]-4-yl)-1 ,3,5-triazin-2-yl]-3-hydroxyphenoxy]-, isooctyl ester

[0169] Film preparation

[0170] Polyvinyl butyrate (PVB) films of the compositions stated in Table 1 were prepared by mixing PVB-1 (Mowital® BA20 from Kuraray, hydroxyl content 20.8-26.6 mol%, glass transition Tg84 °C), tri(ethylene glycol)-bis(2-ethylhexanoate) ("Plasticizer A”) and all other components (cf Table 1) in a plastic bag and melt blending the mixtures on a single screw extruder at 135 °C. The extruded strands were passed through a water bath and pelletized. The pellets were then dried at 30 °C in a vacuum oven for 24 h. Films of 0.8 mm thickness were prepared from the dried pellets via compression molding at 90 °C. The films were then laminated between quartz glass plates by placing the glass / PVB / glass laminates under load in a vacuum oven at 80°C for 1 hour using 0.8 mm distance holders, and the laminates were framed with aluminum film. The composition details are listed in Table 1. The examples "Comp. Ex. A” to E are comparative examples.

[0171] Table 1 All components listed in Table 1 are given in percentage by weight (wt.%) relative to the weight of the total composition.

[0172] UV exposure

[0173] Accelerated UV aging was performed by placing the above PVB films laminated between quartz glass in an Atlas Ci4000 xenon arc Weather-Ometer (WOM). UV exposure of the samples was done for 4500 h according to ISO 4892- 2:2006-06 using the conditions of Method A, Cycle no. 1 , but without water spray.

[0174] Characterization

[0175] UV spectra were recorded using a Shimadzu UV3600i photospectrometer. The total transmission rate %TUV(400) in the wavelength range of 300-400 nm weighted by the intensity of the solar spectrum was calculated according to ISO 13837 Conv. A. The Yellowness Index (Yl) was determined according to ASTM E313. The Yellowness Index is a unitless number derived from spectrophotometric data that indicates the shift in color of a test sample from clear or white to yellow. The results are summarized in Table 2. The UV transmission rate before UV exposure (%Tuv(400) initial) and after UV exposure (%Tuv(400) after WOM) are each given in percent (%). The difference of %Tuv(400) after WOM and %Tuv(400) initial is referred to as Delta %Tuv(400) and is also given in percent (%). The Yellowness Index before the UV exposure is referred to as Yl initial and after the UV exposure it is referred to as Yl after WOM. The difference of Yl after and Yl initial is referred to as Delta Yl.

[0176] Ex. 1 shows higher initial %TUV(400) but same Delta %TUV(400) and improved initial color and improved color retention (lower Delta Yl) compared to comparative example A (commercial refence Tinuvin® 326). Therefore, it can be concluded that Ex. 1 can provide a suitable alternative to the use of Tinuvin® 326.

[0177] Ex. 2 provides a UV absorber blend exhibiting lower initial %TUV(400) than would be expected from the results of Comp. Ex. C and Ex. 1 comprising the single UV absorbers, exhibiting a surprising synergistic effect of UVA-1 and UVA-2. Delta %TUV(400) and Delta Yl are also reduced vs. Comp. Ex. C and Ex. 1 , i.e., the photostability of the UV absorber blend provided in Ex. 2 is improved vs. the single UV absorbers, proving further synergistic effects of this UV absorber combination. Delta %TUV(400) and Delta Yl of Ex. 2 are improved also vs. Comp. Ex. A, showing suitability of the UV absorber blend as a technically viable alternative to Tinuvin® 326.

[0178] The UV absorber blend of Ex. 3 provides lower Delta %TUV(400) than would be expected based on a linear combination of the results of Comp. Ex. B and Ex. 1 , exhibiting synergistic action of the UV absorber combination. In addition, initial Yl and Delta Yl are well below commercial reference in Comp. Ex. 1 , making also the UV absorber blend of Ex. 3 a viable replacement option for Tinuvin® 326. Table 2

Claims

1. Claims1 . An interlayer film for laminated glass comprising- a polyvinyl acetal,- a plasticizer, and- a resorcinol triazine of formula (I)wherein A1, A2, A3 and A4 are independently hydrogen, Ci-Cisalkyl, Ci-Cisalkyl substituted by 1, 2 or 3 radicals selected from the group consisting of -OH, C2-Ci8alkenyloxy, -C(O)OYi and -OC(O)Y2 with Y1 and Y2 being independently Ci-Cisalkyl; Cs-Csoalkyl interrupted by oxygen or Cs-Csohydroxyalkyl interrupted by oxygen.

2. The interlayer film according to claim 1 wherein Ai, A2, A3 and A4 are independently hydrogen or Ci-Cisalkyl.

3. The interlayer film according to claim 1 or 2 wherein A2 is hydrogen and A1, A3 and A4 are independently C1- Cisalkyl.

4. The interlayer film according to claims any of 1 to 3 where Ci-C alkyl is methyl, n-butyl, 2-ethylhexyl or an isomeric mixtue of octyl.

5. The interlayer film according to any of claims 1 to 4 where the resorcinol triazine is of formula (la)6. The interlayer film according to any of claims 1 to 5 wherein the resorcinol triazine is present in the interlayer film in an amount of less than 2.0 wt.%, preferably from 0.01 to 2.0 wt.%.

7. The interlayer film according to any of claims 1 to 6 where the resorcinol triazine is a mixture of at least two different resorcinol triazines, where the mixture of the at least two different resorcinol triazines comprises the resorcinol triazines of the formula (I) and a second, different resorcinol triazines of the formula (III)wherein Bi, B2, B3, B4, and B5 are independently hydrogen, Ci-C alkyl, Ci-C^alkyl substituted by 1, 2 or 3 radicals selected from the group consisting of -OH, C2-Ci8alkenyloxy, -C(O)OYi and -0C(0)Y2 with Y1 and Y2 being independently Ci-C alkyl; Ca-Csoalkyl interrupted by oxygen or Ca-Csohydroxyalkyl interrupted by oxygen and R1is hydrogen or -O-B5.

8. The interlayer film according to any of claim 7 where the mixture of at least two different resorcinol triazines comprises the resorcinol triazines of the formula (la) and the second resorcinol triazines of the formula (lllb)9. The interlayer film according to any of claims 1 to 8 where the interlayer film comprises a benzotriazole-based UV absorber, preferably a 2-(2'-hydroxyphenyl)benzotriazole derivative.

10. The interlayer film according to claim 9 where the benzotriazole-based UV absorber is of the formula (II)11. The interlayer film according to any of claims 1 to 10 wherein the polyvinyl acetal is polyvinyl butyral.

12. The interlayer film according to any of claims 1 to 11 wherein the plasticizer is present in the interlayer film in an amount of 10 to 45 wt.%.

13. The interlayer film according to any of claims 1 to 12 wherein the plasticizer is triethylene glycol bis (2- ethy I hexanoate).

14. A laminated glass comprising the interlayer film as defined in any of the claims 1 to 13.

15. A use of the resorcinol triazine of formula (I) as defined in any of the claims 1 to 13 as an UV absorber in an interlayer film for laminated glass.

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