A resin-impregnated fibrous material in the form of a sheet or a web

Abstract

Disclosed is a resin-impregnated fibrous material in the form of a sheet or a web, comprising an impregnating resin which comprises a) at least one resin component, which is selected from the group consisting of aminoplast resins and phenoplast resins and combinations thereof; and b) a concentrated aqueous polymer dispersion with an average particle size of less than 1000 nm comprising a polymer carrier prepared by heterophase radical polymerization of at least one ethylenically unsaturated monomer in the presence of components b1), b2) and b3); or an emulsion, comprising components b1), b2) and b3, an organic solvent and water; with b1) being at least one triazene-type light stabilizer of formula (I); b2) being at least one hindered amine-based light stabilizer; b3) being a non-ionic, cationic or anionic surfactant.

Description

A resin-impregnated fibrous material in the form of a sheet or a webDescriptionThe present invention relates to resin-impregnated fibrous material in the form of a sheet or aweb, comprisingan impregnating resin which comprisesa) at least one resin component, which is selected from the group consisting of aminoplastresins and phenoplast resins and combinations thereof; andb) a polymer carrier prepared by heterophase radical polymerization of at least oneethylenically unsaturated monomer in the presence of components b1), b2) and b3; or anemulsion, comprising components b1), b2) and b3;b1) at least one light stabilizer of formula(I), whereinAr¹ is a group of the formula(D-2),R® is hydrogen, C1-C24alkyl, C5-C12cycloalkyl, C7-C12phenylalkyl, or halogen;R5 and R are independently of each other hydrogen, or C1-C20alkyl, especially hydrogen;Z is hydrogen, C2-C20alkenyl, or said C2-C20alkenyl, substituted by one to three -R44,OR45, -COOR45, —OCOR45 and / or interrupted by one to three —О—, —СОО—, —осо-or -CO-; especially C1-C24alkyl or C5-C12cycloalkyl; or said C1-C24alkyl or said C5-C12cycloalkyl substituted by one to three -R44, —OR45, —COOR45, —OCOR45 and / orinterrupted by one to three —О—, —СОО—, —ОСО— or -CO-;R44 is C6-C12aryl, C6-C12aryl substituted by one to three halogen, C1-C8alkyl, C1-C8alkoxy, orcombinations thereof; C5-C12cycloalkyl; C7-C12phenylalkyl, C7-C12phenylalkyl substituted onthe phenyl ring by one to three halogen, C1-C8alkyl, C1-Calkoxy, or combinations thereof;R45 is defined as is R44; or is hydrogen or C1-C24alkyl;Ar2 and Ar³ in formula (I) are independently of each other selected from a group of theformula (D-2),(D-3), phenyl or phenyl substituted by one to three C1-Coalkyl, halogen, hydroxy or C1-C12alkoxy; naphthyl or naphthyl substituted by one to three(D-4);R51, R52, R53, R54 and R55 are independently of each other hydrogen, hydroxy, cyano, C1-C20alkyl, C1-C20alkoxy, C7-C12phenylalkyl, C5-C12cycloalkyl, C5-C12cycloalkyloxy, or halogen;Z' is as defined for Z; R6 is as defined for R6, R5 and R are as defined for R5 and R8,respectively;b2) at least one a hindered amine-based light stabilizer preferably selected from hinderedamine light stabilizer of formula(lla), A is -CH(R3)CH2- or CH2CH(R3)-; each R¹ is C1-C21alkyl; acyclic C1-C21alkenyl having 1, 2, or 3double bonds; or C3-C7cycloalkyl ; R2 is H or C1-C3alkyl; and R³ is H or C1-C4alkyl; hinderedamine light stabilizer of formula(IIb), wherein R is H,CH3 or OC8H17; and mixtures thereof; andb3) a non-ionic, cationic or anionic surfactant; andc) optionally an Excited State Quencher (ESQ).Prior ArtEP1251954B1 composition comprising particles which comprise a core material within apolymeric shell, wherein the core material comprises a hydrophobic substance, characterisedin that the polymeric shell comprises a copolymer formed from a monomer blend whichcomprises,A) 30 to 90% by weight methacrylic acidB) 10 to 70% by weight alkyl ester of (meth) acrylic acid which is capable of forming ahomopolymer of glass transition temperature in excess of 60°C andC) 0 to 40% by weight other ethylenically unsaturated monomer.US2006 / 287416A1 pertains to a concentrated aqueous dispersion of organic light stabilizerswith a particle size of less than 1000 nm, prepared by heterophase radical polymerization ofethylenically unsaturated monomers in the presence of the light stabilizers, wherein theweight ratio of light stabilizer to polymeric carrier is greater than 50 / 100, and a process forthe preparation of such aqueous dispersions with high light stabilizer content.US20080146448 relates to an aqueous polymer dispersion with a mean particle size of thedispersed particles of less than 1000 nm, comprising the polymer particles comprising apolymer matrix formed from at least one ethylenically unsaturated monomer and at least oneeffect substance which is soluble in the ethylenically unsaturated monomers from which thepolymers are formed, wherein the dispersed polymer particles comprise at least 0.1% byweight of at least one polymer selected from the group consisting of(i) homopolymers of ethylene, propylene, 1-butene, 2-butene, 1-pentene or 1-hexene with anaverage molar mass MW from 100 to 10 000,(ii) copolymers of at least two of the monomers mentioned under (i) with an average molarmass MW from 100 to 10 000 and(iii) polyisobutylene with an average molar mass MW of at least 100. The effect substancesare selected from the group consisting of UV absorbers, IR absorbers, organic colorants,optical brighteners, antioxidants for polymers, antifogging agents for polymers, antistaticagents for polymers, flame retardants for polymers, lubricants for polymers, reactive sizingagents for paper, pharmaceutical active substances, biocides, fungicides, herbicides,nematicides, acaricides, insecticides, safeners and active substances which regulate plantgrowth.WO2011 / 012631A1 pertains to a concentrated aqueous polymer dispersion with an averageparticle size of less than 1000 nm comprising a polymer carrier, a non-polar organic phenolicantioxidant and a surfactant. The present invention also pertains to a process for thepreparation of said concentrated aqueous polymer dispersion, to a polymer powderobtainable from said concentrated aqueous polymer dispersion, to a composition comprisingan organic material and said concentrated aqueous polymer dispersion or said polymerpowder and to the use of said concentrated aqueous polymer dispersion or said polymerpowder as stabiliser for organic material.WO2012 / 104287 aims to improve temperature resistance for a curable composition basedon a silyl-terminated polymer. This is achieved by using a combination of at least twophenolic compounds, of which one is free of thioether groups, while the other contains atleast one thioether group in at least one alkyl side chain. The invention further relates to theuse of the curable composition as an adhesive, sealant and / or coating substance and to theuse of the combination of phenolic compounds to increase the temperature stability incurable compositions.WO201942999A1 relates to aqueous polymer dispersions with an average particle size ofless than 1000 nm comprisinga) a polymer carrier prepared by heterophase radical polymerization of at least oneethylenically unsaturated monomer in the presence of(b) an oil-soluble organic UV absorber selected from the class of p-aminobenzoic acidderivatives; salicylic acid derivatives; benzophenone derivatives; diphenyl acrylatederivatives; benzofuran derivatives; polymeric UV absorbers, comprising one or more orga-nosilicon radicals; cinnamic acid derivatives; camphor derivatives; s-triazine derivatives;trianilino-s-triazine derivatives; menthyl anthranilates; and benzotriazole derivatives;wherein the weight ratio of the oil-soluble organic UV absorber (b) to polymer carrier (a) isgreater than 50 parts UV absorber per 100 parts of carrier; andc) a surfactant selected fromc1) a nonionic surfactant selected frome11) the condensation product of a C6 to C18 fatty alcohol or C6 to C18 fatty acid and a mono-or disaccharide; andC2) an anionic surfactant selected fromC21) sulfosuccinates and sulfosuccinamates;C22) fatty alcoholates; andC23) mixtures of phosphoric acid esters and fatty alcohols having from 6 to 18, preferablyfrom 8 to 10 carbon atoms. The aqueous polymer dispersions show unexpectedly highsunscreen effects and a positive skin feeling.To produce so-called high-pressure laminates (HPL), melamine-and phenolic-resin-impregnated papers can be pressed together under high pressure of at least 5 MPa(specific), at temperatures above 120 °C and a cycle time, which is generally from 30 to 100seconds. The composite material produced in this way is in this case provided with adecorative covering layer. Thus, it is possible to realize special appearance, such as, forexample, wood imitation or unidecoration. These decorative laminates are used in manyfields of application, such as, for example, table tops, door leaves, furniture, kitchen worktopsand panels for wall, balcony or façade cladding.Conventional HPL plates once exposed in an outdoor environment undergo a very fastdegradation of the surface. The way they are processed / produced the upper layer is not UV-protected and does not protect the underneath printed paper image (decor). Therefore, theseplates cannot be used for exterior paneling for facades. Whereas no particular UV protectionis required in indoor applications, the melamine resin surface in the outdoor use mustadditionally be provided with a protective layer, since pure melamine resin surfaces alreadyexhibit unambiguous degradation after a relatively short time.Suitable, acceptable weathering protection of the HPL can be achieved, for example, bysimultaneous pressing of an additional UV protection film, for example, a film based onpoly(methyl)methacrylate, or a urethane acrylate based clear coat, comprising UV absorberand HALS.US2005 / 148698A1 relates to a UV-resistant, thermocurable aminoplast composite consistingof lignocellulose and / or cellulose impregnated with a stabiliser and an aminoplast containingstabilisers and to the production and use of said composite.US2023 / 100304A1 relates to an acrylic multilayer foil which includes a layer A in which silicaparticles are uniformly distributed in an acrylic polymer matrix and a coating layer D. Due toadhesive promoting properties of the layer A containing silica particles, the coating layer Dcan be advantageously applied onto the layer A. The foil is suitable for surface-protection ofmaterials such as polyvinyl chloride (PVC) and for use in high-pressure laminates (HPLs).US2023 / 279613A1 relates to sheets or webs of a resin-impregnated fibrous material,including an impregnating resin, which includes a combination of a) at least one resincomponent A, which is selected from the group consisting of aminoplast resins andphenoplast resins and mixtures thereof; and b) at least one resin component B, which is anoligomer or polymer having ethylenically unsaturated double bonds, where at least 40 mol %of the ethylenically unsaturated double bonds are selected from the group consisting of allylgroups, acryl groups and methacryl groups. Further disclosed is a process for producing aresin-impregnated fibrous material, which includes impregnating a fibrous material in theform of a sheet or a web with a liquid resin composition including a combination of a) theresin component A; and b) the resin component B.WO2015 / 180995A1 relates to a at least three-layered film composite characterized by goodadhesion to the substrate and good optical properties. In this composite, the outermost layeris a layer that contains a fluoropolymer, the middle layer is a PMMA layer that contains atleast one UV absorber and / or UV stabilizer, and the innermost layer is a PMMA layer thatcontains at least one adhesion promoter which improves adhesion to the substrate.To avoid this extra expensive production step(s) the light stabilizers were added in theoverlay. The use of conventional light stabilizer packages (solvent borne, water borne andpowder) lead to an inhomogeneous, turbid and sticky surface, which cannot be used or soldto end customers.An object of the present invention is to provide a light stabilizer package which is designed tobe fully compatible with the liquid formulation and the production process of the HPL platesresulting in high gloss retention in combination with low discoloration.It is a further object of the present invention that the UV stabilization provided does not impartnegatively the look and the performance of the processed plates (scratch resistance,transparency) and significantly improve the weathering resistance of the HPL plates.Accordingly, the present invention relates to a resin-impregnated fibrous material in the formof a sheet or a web, comprising an impregnating resin, which is preferably an aqueous resincomposition and which comprisesa) at least one resin component, which is selected from the group consisting of aminoplastresins and phenoplast resins and combinations thereof; andb) a concentrated aqueous polymer dispersion with an average particle size of less than1000 nm (i.e. droplets of ethylenically unsaturated monomer and and components b1) andb2) with an average particle size of less than 1000 nm), comprisinga polymer carrier prepared by heterophase radical polymerization of at least one ethylenicallyunsaturated monomer in the presence ofb1) at least one light stabilizer of formula(I), whereinAr¹ is a group of the formula(D-2),R® is hydrogen, C1-C24alkyl, C5-C12cycloalkyl, C7-C12phenylalkyl, or halogen;R5 and R are independently of each other hydrogen, or C1-C20alkyl, especially hydrogen;Z is hydrogen, C2-C20alkenyl, or said C2-C20alkenyl, substituted by one to three -R44,OR45, -COOR45, —OCOR45 and / or interrupted by one to three —О—, —СОО—, —осо-or -CO-; C1-C24alkyl or C5-C12cycloalkyl; or said C1-C24alkyl or said C5-C12cycloalkylsubstituted by one to three -R44, —OR45, —COOR45, —OCOR45 and / or interrupted by oneto three -O—, —СОО-, -ОСО— or -CO-;R44 is C6-C12aryl, C6-C12aryl substituted by one to three halogen, C1-C8alkyl, C1-C8alkoxy, orcombinations thereof; C5-C12cycloalkyl; C7-C12phenylalkyl, C7-C12phenylalkyl substituted onthe phenyl ring by one to three halogen, C1-C8alkyl, C1-C8alkoxy, or combinations thereof;R45 is defined as is R44; or is hydrogen or C1-C24alkyl;Ar2 and Ar³ in formula (I) are independently of each other selected from a group of theformula (D-2),(D-3), phenyl or phenyl substituted by one to three C1-Coalkyl, halogen, hydroxy or C1-C12alkoxy; naphthyl or naphthyl substituted by one to three(D-4);R51, R52, R53, R54 and R55 are independently of each other hydrogen, hydroxy, cyano, C1-C20alkyl, C1-C20alkoxy, C7-C12phenylalkyl, C5-C12cycloalkyl, C5-C12cycloalkyloxy, or halogen;Z' is as defined for Z; R6 is as defined for R6, R5 and R8 are as defined for R5 and R8,respectively;b2) at least one a hindered amine-based light stabilizer preferably selected from hinderedamine light stabilizers of formula(lla), A is -CH(R3)CH2- or CH2CH(R3)-; each R¹ is C1-C21alkyl; acyclic C1-C21alkenyl having 1, 2, or 3double bonds; or C3-C7cycloalkyl ; R2 is H or C1-C3alkyl; and R³ is H or C1-C4alkyl; hinderedamine light stabilizers of formula(Ilb), whereinY¹ is -(CH2)y, or a group of formula,whereinR is H, CH3, OC8H17, or OC6H11;y is an integer of 6 to 10,B¹ and B2 are independently of each other C1-C12alkyl, especially C3-C6alkyl,B³ is H, and B4 is -(CH2) b-OH, b is an integer of 1 to 4, especially(llb1), wherein R is H, CH3 or OC8H17;hindered amine light stabilizers of formula(IIc), whereinA¹ is a direct bond or C1-C10alkylene;A2 is -CH(R3)CH2- or CH2CH(R3)-;R2 is H or C1-C3alkyl; and R³ is H or C1-C4alkyl;n is a number of from 2 to 50; and mixtures thereof; andb3) a non-ionic, cationic or anionic surfactant; andc) optionally an Excited State Quencher (ESQ).In said embodiment the non-ionic, cationic or anionic surfactant is an anionic surfactant.Examples for anionic surfactants are alkali and ammonium salts of sulphonic acid (e.g. C12-C18alkylsulfonic acid), mono- or dialkylsulfosuccinates, or sulfuric acid halfesters ofethoxylated alkanoles, especially poly(oxy-1,2-ethanediyl), a-sulfo-o-hydroxy-, C12-14-alkylethers, sodium salts (CAS no. 68891-38-3). Some compounds are known for example fromUS4269749 and largely items of commerce, such as under the trade name Dowfax® 2A1(Dow Chemical Company).By this invention, a light stabilizer package was designed to be fully compatible with the liquidformulation and the production process and a proper UV stabilization was achieved. The UVstabilization provided by the present invention does not impart negatively the look and theperformance of the processed plates (scratch resistance, transparency) and significantlyimprove the weathering resistance of the HPL plates to make them suitable for this highdemanding application.To make it perfectly compatible with the water borne resin system based on melaminespecific monomer compositions for the capsule, specific surfactants and optimized blends ofUV absorbers and HALS have to be used designed to achieve the best weatheringstabilization.Further improvement of the weathering stability of such plates is achieved by using anexcited state quencher (ESQ) preferably based on a salt of a hydroxyl amine. Use of thecombination of the light stabilizers with ESQ in the overlay without modifying the existingproduction process, leads to proper weathering stability without the additional step ofapplying another clear coat.In addition, the present invention relates to an impregnating resin which comprisesa) at least one resin component, which is selected from the group consisting of aminoplastresins and phenoplast resins and combinations thereof;b) an emulsion, comprisingb1) at least one light stabilizer of formula(I), whereinAr¹ is a group of the formula(D-2),R® is hydrogen, C1-C24alkyl, C5-C12cycloalkyl, C7-C12phenylalkyl, or halogen;R5 and R are independently of each other hydrogen, or C1-C20alkyl, especially hydrogen;Z is hydrogen, C2-C20alkenyl, or said C2-C20alkenyl, substituted by one to three -R44,OR45, -COOR45, -OCOR45 and / or interrupted by one to three —О—, —СОО—, —ОСО-or -CO-C1-C24alkyl or C5-C12cycloalkyl; or said C1-C24alkyl or said C5-C12cycloalkylsubstituted by one to three -R44, —OR45, —COOR45, —OCOR45 and / or interrupted by oneto three -O—, —СОО-, -ОСО— or -CO-;R44 is C6-C12aryl, C6-C12aryl substituted by one to three halogen, C1-C8alkyl, C1-C8alkoxy, orcombinations thereof; C5-C12cycloalkyl; C7-C12phenylalkyl, C7-C12phenylalkyl substituted onthe phenyl ring by one to three halogen, C1-C8alkyl, C1-C8alkoxy, or combinations thereof;R45 is defined as is R44; or is hydrogen or C1-C24alkyl;Ar2 and Ar³ in formula (I) are independently of each other selected from a group of theformula (D-2),(D-3), phenyl or phenyl substituted by one to three C1-Coalkyl, halogen, hydroxy or C1-C12alkoxy; naphthyl or naphthyl substituted by one to three(D-4);R51, R52, R53, R54 and R55 are independently of each other hydrogen, hydroxy, cyano, C1-C20alkyl, C1-C20alkoxy, C7-C12phenylalkyl, C5-C12cycloalkyl, C5-C12cycloalkyloxy, or halogen;Z' is as defined for Z; R6 is as defined for R6, R5 and R are as defined for R5 and R8,respectively;b2) at least one a hindered amine-based light stabilizer preferably selected from hinderedamine light stabilizers of formula(lla), A is -CH(R3)CH2- or CH2CH(R3)- ; each R¹ is C1-C21alkyl; acyclic C1-C21alkenyl having 1, 2, or 3double bonds; or C3-C7cycloalkyl ; R2 is H or C1-C3alkyl; and R³ is H or C1-C4alkyl; hinderedamine light stabilizers of formula(llb), whereinY¹ is -(CH2)y, or a group of formula,whereinR is H, CH3, OC8H17, or OC6H11;y is an integer of 6 to 10,B¹ and B2 are independently of each other C1-C12alkyl, especially C3-C6alkyl,B³ is H, and B4 is -(CH2)b-OH, b is an integer of 1 to 4, especially(llb1), wherein R is H, CH3 or OC8H17;hindered amine light stabilizers of formula(IIc), whereinA¹ is a direct bond or C1-C10alkylene;A2 is -CH(R3)CH2- or CH2CH(R3)-;R2' is H or C1-C3alkyl; and R³ is H or C1-C4alkyl;n is a number of from 2 to 50; and mixtures thereof; andb3) a non-ionic, cationic or anionic surfactant;b4) an organic solvent and water; andc) optionally an Excited State Quencher (ESQ).In said embodiment the non-ionic, cationic or anionic surfactant is preferably a cationicsurfactant. Examples for cationic surfactants are C1-C2-alkyl sulfate, tosylate or halogenidesalts of quaternary tetra alkyl ammonium compounds such as dodecyl dimethylethylammonium ethyl sulfate, dodecyltrimethylammonium chloride, dimethyldidecylammoniumchloride hexadecyltrimethylammonium chloride, cetyltrimethylammonium bromide, C8-C18-alkyl benzyl dimethylammonium chloride, 3-(dodecylamino)-2-hydroxypropyl)trimethylammonium tosylate, or C1-C2-alkyl sulfate or halogenide salts ofquaternary tetra alkyl ammonium compounds, where one, two or three alkyl groups arealkoxylated substituents such as poly(oxy-1,2-ethanediyl), a,a-methyl-(9Z)-9-octadecenyliminiodi-2, 1-ethanediylbis-2-hydroxy-, methyl sulfate or 1-octahexadecanaminium, N,N-polyethoxylate, N-methyl, methyl sulfate.The emulsion is an oil-in-water emulsion (liquid droplet in liquid medium) and compriseswater and an organic solvent (oil phase, organic phase).A process for the preparation of the emulsion comprises shear mixing an oil phasecomprising components b1), b2) and b3) with an aqueous phase comprising water andsurfactant, especially an anionic surfactant.The emulsion is obtainable (preferably obtained) by shear mixing an oil phase comprisingcomponents b1), b2) and b3) with an aqueous phase comprising water and the surfactant,especially the anionic surfactant. The emulsion normally forms upon shearing.The oil phase comprises an organic solvent. The solubility in water of said solvent is usuallyup to 300 g / l at 20 °C, especially up to 150 g / l at 20 °C, very especially up to 100 g / l at 20 °C.The components b1), b2) and b3) are added to the organic solvent and stirred untildissolved / uniform (oil phase, or organic phase).Examples for suitable organic solvents are esters, such as, for example, ethyl acetate,propylacetate, butyl acetate, ethylpropionate, 1-methoxy-2-propylacetate, aromatichydrocarbons, such as xylene isomers and alkylbenzenes, aliphatic hydrocarbons, such as,for example, cyclohexane, hexane and octane, ketones, such as, for example, methyl ethylketone, diisobutylketone and methylisobutylketone, and alcohols, such as, for example, 1-butanol, 2-butanol, isobutanol and 1-pentanol.The emulsion may comprise from 5 to 30 wt%, especially from 10 to 20 wt% of the organicsolvent.The oil phase normally accounts for between about 35% to 65% of the total formulation byweight. In an embodiment, the oil phase accounts for between about 45% to 57% of thetotal formulation weight.The oil-in-water emulsion comprises at least one surfactant, especially at least one cationicsurfactant. In various embodiments, the oil-in-water emulsion comprises not less than 0.5%by weight of anionic surfactants, not less than 2% by weight, or not less than 3% by weight.In other embodiments, the oil-in-water emulsion can comprise not more than 30% by weight,not more than 15% by weight, or not more than 10% by weight of anionic surfactants.The droplets of the organic phase in general have an average droplet size (D50) below 800nm, preferably an average droplet size (D50) below 400, more preferably an average dropletsize (D50) below 300. The average droplet size (D50) is in general above 100 nm. Theaverage droplet size (D50) is preferably above 100 nm and below 400 nm, more preferablyabove 100 nm and below 300 nm.The polydispersity is preferably in the range of from 0.25 to 0.45.The components b1), b2) and b3) are contained in the organic phase in an amount of greaterthan 50% by weight based on components b1), b2), b3) and solvent(s).Light stabilizer of formula (1)The at least one light stabilizer has the formula(I), especially the formula(I').Ar¹ is a group of the formula(D-2),R6 is hydrogen, C1-C24alkyl, C5-C12cycloalkyl, C7-C12phenylalkyl, or halogen;R5 and R are independently of each other hydrogen, or C1-C20alkyl, especially hydrogen;Z is hydrogen, especially C1-C24alkyl or C5-C12cycloalkyl; or said C1-C24alkyl or said C5-C12cycloalkyl substituted by one to three -R44, —OR45, —COOR45, —OCOR45 and / orinterrupted by one to three —О—, —СОО—, —ОСО— or -CO-;R44 is C6-C12aryl, C6-C12aryl substituted by one to three halogen, C1-C8alkyl, C1-C8alkoxy, orcombinations thereof; C5-C12cycloalkyl; C7-C12phenylalkyl, C7-C12phenylalkyl substituted onthe phenyl ring by one to three halogen, C1-C8alkyl, C1-C&alkoxy, or combinations thereof;R45 is defined as is R44; or R45 is also hydrogen or C1-C24alkyl.Here and throughout the specification, the term "halogen" denotes fluorine, bromine, chlorineor iodine, particularly chlorine, bromine or iodine.The term "C1-Chalkyl" denotes a group of linear or branched saturated hydrocarbon radicalshaving from 1 to n carbon atoms. For example, the term C1-C24-alkyl denominates a group oflinear or branched saturated hydrocarbon radicals having from 1 to 24 carbon atoms, whilethe term C1-C4-alkyl denominates a group of linear or branched saturated hydrocarbonradicals having from 1 to 4 carbon atoms. Examples of alkyl include but are not limited tomethyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, 2-methylpropyl(isopropyl), 1,1-dimethylethyl (tert-butyl), pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl,2,2-dimethylpropyl, 1-ethylpropyl, hexyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl,1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1,1-dimethylbutyl,1,2-dimethylbutyl, 1,3-dimethylbutyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, 3,3-dimethylbutyl,1-ethylbutyl, 2-ethylbutyl, 1,1,2-trimethylpropyl, 1,2,2-trimethylpropyl, 1-ethyl-1-methylpropyl,1-ethyl-2-methylpropyl, heptyl, octyl, 2-ethylhexyl, 1,1,3,3-tetramethylbutyl (tert-octyl), nonyl,isononyl, decyl, undecyl, dodecyl, tridecyl, isotridecyl, tetradecyl, pentadecyl, hexadecyl,heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl docosyl and in case of nonyl, isononyl,decyl, undecyl, dodecyl, tridecyl, isotridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl,octadecyl, nonadecyl, eicosyl, heneicosyl docosyl their isomers, in particular mixtures ofisomers such as "isononyl", "isodecyl". Examples of C1-C4alkyl are for example methyl, ethyl,propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl or 1,1-dimethylethyl.The term "alkylene" as used herein denotes a straight-chain or branched alkyl radical asdefined above, wherein one hydrogen atom at any position of the carbon backbone isreplaced by one further binding site, thus forming a bivalent moiety.The term "C1-C24alkoxy" as used herein denotes straight-chain or branched C1-C24 alkyl asdefined above bound to the remainder of the molecule through an oxygen. Examples for C1-C4-alkoxy are methoxy, ethoxy, n-propoxy, 1-methylethoxy, butoxy, 1-methylpropoxy,2-methylpropoxy and 1,1-dimethylethoxy.The term "C3-C10cycloalkyl" as used herein denotes a mono-, bi- or tricyclic cycloalkyl radicalwhich is unsubstituted or substituted by one or more radicals R7, for example 1, 2, 3 or 4 R7radicals. Examples of C3-C10cycloalkyl include but are not limited to cyclopropyl, cyclobutyl,cyclopentyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, cycloheptyl, cyclooctyl, andnorbornyl (= bicyclo[2.2.1]heptyl).The term "C6-C10aryl" as used herein denotes phenyl or naphthyl.Z is preferably (CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14;n1 is 0 or 1;R12 is C1-C18alkyl or C6-C12aryl or CO-C1-C18alkyl;R13 is H or C1-C8alkyl; R14 is C1-C12alkyl or C2-C12alkenyl or C5-C6cycloalkyl.R14 is preferably C1-C12alkyl or C5-C6cycloalkyl.R5 and R6 are preferably hydrogen. R8 is preferably hydrogen or methyl.Ar2 and Ar³ in formula (I) can be the same, or different and are selected from a group of theformula (D-2),(D-3), phenyl or phenyl substituted by one to three C1-Coalkyl, halogen, hydroxy or C1-C12alkoxy; and(D-4).In an embodiment Ar² and Ar³ in formula (I) are independently of each other selected from agroup of the formula (D-2). In said embodiment the compound of formula (A) is preferably acompound of formula(la), whereinZ is (CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14; n1 is 0 or 1; R12 isC1-C18alkyl, or C6-C12aryl or CO-C1-C18alkyl; R13 is H or C1-C8alkyl; R14 is C1-C12alkyl or C2-C12alkenyl or C5-C6cycloalkyl.R14 is preferably C1-C12alkyl or C5-C6cycloalkyl.In another embodiment Ar² and Ar³ in formula (I) are independently of each other phenyl orphenyl substituted by one to three C1-C6alkyl. In said embodiment the compound of formula(A) is preferably a compound of formula(lb).R5', R5", R7' and R7" are hydrogen or C1-C6alkyl, especially C1-C3alkyl.Z is preferably (CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14;n1 is 0 or 1;R12 is C1-C18alkyl or C6-C12aryl or CO-C1-C18alkyl;R13 is H or C1-C8alkyl; R14 is C1-C12alkyl or C2-C12alkenyl or C5-C6cycloalkyl.In another embodiment Ar² and Ar³ in formula (I) are independently of each other a group ofthe formula; wherein R51, R52, R53, R54 and R55 are preferablyhydrogen.In said embodiment the compound of formula (I) is preferably a compound of formula(Ic), especially(Ic').R51, R52, R53, R54 and R55 are defined above and are preferably hydrogen.Z is preferably (CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14;n1 is 0 or 1;R12 is C1-C18alkyl or C6-C12aryl or CO-C1-C18alkyl;R13 is H or C1-C8alkyl; R14 is C1-C12alkyl or C2-C12alkenyl or C5-C6cycloalkyl.For the process described herein, a few exemplary light stabilizers of formula (A) are listedhereinbelow.Most preferably the light stabilizer of formula (A) is selected from 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-(hexyloxy)-phenol, 2-(4,6-bis-(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-(octyloxy)-phenol, 2-[4,6-Bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-[3-(dodecyloxy)-2-hydroxypropoxy]phenol and 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-[2-hydroxy-3-(tridecyloxy)propoxy]phenol, 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-[3-[(2-ethylhexyl)oxy]-2-hydroxypropoxy]phenol, 2-[4,6-Bis([1,1'-biphenyl]-4-yl)-1,3,5-triazin-2-yl]-5-[(2-ethylhexyl)oxy]phenol, 2-[2-hydroxy-4-(1-octyloxycarbonylethyl)oxyphenyl]-4,6-di(4-phenyl)phenyl-1,3,5-triazine, 2,4,6-tri(2,4-dihydroxyphenyl)-1,3,5-triazine, 2,4-bis[2-hydroxy-4-butoxyphenyl]-6-(2,4-dibutoxyphenyl)-1,3,5-triazine, 2,2'-[6-(4-methoxyphenyl)-1,3,5-triazine-2,4-diyl]bis(5-((2-ethylhexyl)oxy)-phenol, 2,4,6-tris-(2'-hydroxy-4'-butoxyphenyl)-1,3,5-triazine, 2,2',2"-(1,3,5-triazine-2,4,6-triyl)tris[5-(octyloxy)phenol], 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine, 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-[2-hydroxy-3-(tridecyloxy)propoxy]-phenol, 2,4,6-tris[4-(1-octyloxycarbonyl)ethyloxy-2-hydroxyphenyl]-1,3,5-triazine, 1,1'-dioctyl 2,2'-[[4-[4,6-bis[2-hydroxy-4-[1-methyl-2-(octyloxy)-2-oxoethoxy]phenyl]-1,3,5-triazin-2-yl]-1,3-phenylene]bis(oxy)]bis[propanoate], 2,4-bis(2,4-dihydroxyphenyl)-6-(4-methoxyphenyl)-1,3,5-triazine, 2-(2,4-dihydroxyphenyl)-4,6-diphenyl-1,3,5-triazine, 2,6-bis(2,4-dimethylphenyl)-4-(2,4-dihydroxyphenyl)-s-triazine, 4-[4,6-bis([1,1'-biphenyl]-4-yl)-1,3,5-triazin-2-yl]-1,3-benzenediol and 2,4,6-tris(2,4-dihydroxy-3-methylphenyl)-1,3,5-triazine and 2,4,6-tribiphenyl-4-yl-1,3,5-triazine. One or more of thementioned compounds may exist in one or more isomeric or polymorphic forms, one or moreof which may reveal an improved activity. Such forms or isomers are considered to beincluded within the scope of the present invention. Purification and isolation to yield one ormore of such preferred isomers or forms is considered within the scope of this application.A few exemplary light stabilizers of formula (A) are selected from Tinuvin® 1577 (CAS147315-50-2), Cyasorb® UV-1164 (CAS 2725-22-6), Tinuvin® 400 (CAS 153519-44-9),Tinuvin® 405 (CAS 137658-79-8), Tinuvin® 1600 (CAS 204583-39-1), Tinuvin® 479 (CAS204848-45-3, CAS 304671-49-6), Tinuvin® 460 (CAS 208343-47-9), Tinuvin® 477 (CAS446824-06-2), Tinuvin® 1400 (CAS 2725-22-6), Tinosorb® S (CAS 187393-00-6), Triazin 5(CAS 3135-19-1), P 800 (CAS 13681-75-9), LA-F 70 (CAS 222529-65-9), 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-[2-hydroxy-3-(tridecyloxy)propoxy]-phenol (CAS 178905-32-3) and 6-[(2E)-4,6-bis[(1E)-4-(octyloxy)-6-oxocyclohexa-2,4-dien-1-ylidene]-1,3,5-triazinan-2-ylidene]-3-(octyloxy)cyclohexa-2,4-dien-1-one (CAS 2733595-35-0).Hindered amine-based light stabilizerIn the compound of formula(lla), A is a group offormula -CH(R3)-CH2- or -CH2-CH(R3)-. Further, each R¹ is individually a C1-C21 alkyl, acyclicC3-C21 alkenyl having 1, 2, or 3 double bonds, or C3-C7 cycloalkyl. In some embodiments, R1is a substituted C1-C21 alkyl where the substituent is OR5 or CN, wherein R5 is H, methyl,ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, or tert-butyl (i.e. a C1-C4 alkyl). In someembodiments, R¹ is a substituted C3-C7 cycloalkyl, wherein the substituent is methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, tert-butyl, OR5, or CN, wherein R5 is H, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, or tert-butyl (i.e. a C1-C4 alkyl). In some embodiments,R¹ is C4-C21 alkyl substituted with -COR4 or -C(O) R4 where R4 is methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, or tert-butyl (i.e. a C1-C4 alkyl). In any of the above embodiments,all R¹ groups in a compound of formula (lla) are the same.In various embodiments, in the compound of formula (Ila), R¹ may be C1-C17 alkyl, a C1-C12alkyl, or a C3-C7 cycloalkyl. In any of the above embodiments, R¹ may be a branched alkyl.In any of the above embodiments, R¹ may be methyl, ethyl, n-propyl, isopropyl, tert-butyl, n-pentyl, 1-ethylpentyl, 1,13,3-tetramethylbutyl, 2,4,4-trimethylpentyl, 1-propylhexyl, n-undecyl,n-tridecyl, n-pentadecyl, n-heptadecyl, cyclopentyl, cyclohexyl, 2-methoxyethyl,methoxymethyl, or acetoethyl. In some embodiments, R¹ is 1-ethylpentyl,2,4,4-trimethylpentyl, or 1-propylhexyl. In some embodiments, R¹ is a C1-C21 alkylsubstituted with at least one substituent selected from C1-C4 alkoxy and OH.In the compound of formula (lla), R2 is methyl, ethyl, n-propyl, or iso-propyl (i.e. a C1-C3alkyl). In the compound of formula (I), R³ is H, methyl, ethyl, n-propyl, iso-propyl, n-butyl,sec-butyl, or tert-butyl (i.e. a C1-C4 alkyl). In any of the above embodiments, R2 may be H,methyl, ethyl, n-propyl, or iso-propyl. In some embodiments, R2 is H.In the compound of formula (lla), A may be -CH2-CH2-, -CH(CH3)-CH2-, -CH2-CH(CH3)-, -CH2-CH(CH2-CH3)-, -CH(CH2-CH3)-CH2-, -CH2-CH(CH2-CH2-CH3)-, -CH(CH2-CH2-CH3)-CH2-,-CH2-CH(CH2-CH2-CH2-CH3), or -CH2-CH(CH2-CH2-CH2-CH3). In some embodiments, Ais -CH2-CH2-, -CH(CH3)-CH2-, or -CH2-CH(CH3)-. In some embodiments, A is -CH2-CH2- or~CH(CH3)-CH2-, where the "~" end is attached to the carbonyl carbon. In yet otherembodiments, A is -CH2-CH2-.In yet another embodiment, in the compound of formula (lla), both R¹ groups are the sameand are methyl, ethyl, isopropyl, tert-butyl, n-pentyl, 1-ethylpentyl, 1,13,3-tetramethylbutyl,2,4,4-trimethylpentyl, 1-propylhexyl, n-undecyl, n-tridecyl, n-pentadecyl, n-heptadecyl,cyclopentyl, cyclohexyl, 2-methoxyethyl, methoxymethyl, or acetoethyl; R2 is H; and Ais -CH2-CH2- or ~CH(CH3)-CH2-.The resin-impregnated fibrous material in the form of a sheet or a web may include thehindered amine light stabilizer of formula (Ila), where each R¹ is C1-C21 alkyl or C3-C7cycloalkyl. For example, R¹ may be C1-C17 alkyl, or C3-C12 alkyl, or C3-C6 cycloalkyl.The resin-impregnated fibrous material in the form of a sheet or a web may include thehindered amine light stabilizer of formula (Ila), where each R¹ is C1, C2, C3, C4, C5, C6, C7, C8,C9, C10, C11, C12, C13, C14, C15, C16, or C17 alkyl.The resin-impregnated fibrous material in the form of a sheet or a web may include thehindered amine light stabilizer of formula (lla), where each R¹ is C1-C21 alkyl substituted withat least one substituent selected from C1-C4 alkoxy and -OH.The resin-impregnated fibrous material in the form of a sheet or a web may include thehindered amine light stabilizer of formula (Ila), where R2 is H.The resin-impregnated fibrous material in the form of a sheet or a web may include thehindered amine light stabilizer of formula (lla), where A is -CH2-CH2-, -CH(CH3)-CH2-,or -CH2-CH(CH3)-. For example, A may be -CH2-CH2-.Examples of the hindered amine light stabilizer of formula (lla) are shown below:(B-1),(B-2),(B-3),(B-4),(B-5),(B-6,)(B-7),(B-8),(B-9),(B-10),(B-11),(B-12), and(B-13).Examples of the compound of formula (IIb) are(B-18),(B-14),(B-15) and(B-16).An Example of the compound of formula (IIc) is(B-17).Cpds. B-1 to B-19 listed in claim 5 are preferred, cpds. B-2, B-15 and B-16 are preferred,cpds. B-2 and B-16 are more preferred, and cpd. B-16 is most preferred.Excited State Quencher (ESQ)Excited State Quencher interacts with high-energy states of molecules, e.g. caused by UV-radiation or visible light, and significantly reduces the probability of degradation reactions andscavengers radical intermediates. This mechanism works complimentarily to that of UV lightstabilizers.Examples of ESQs are hindered nitroxyl compounds, hindered hydroxylamine compoundsand hindered hydroxylamine salt compounds.Most preferred, the ESQ is a compound of formula(tris(tetramethylhydroxypiperidinol)citrate).Heterophase Radical PolymerizationAnother aspect of this invention is a process for the preparation of a concentrated aqueouspolymer dispersion with an average particle size of less than 1000 nm comprising the stepspolymerizing at least one ethylenically unsaturated monomer in the presence ofb1) at least one light stabilizer of formula (I);b2) at least hindered amine-based light stabilizer; andc) cationic or anionic surfactant preferably by heterophase radical polymerization.The average particle size is less than 1000 nm, especially less than 800 nm, very especiallyless than 600 nm.The surfactant can be a non-ionic, cationic or anionic surfactant (preferably an anionicsurfactant). The polymerisation is preferably done by a heterophase radical polymerization.The weight ratio of stabilizer compound(s) to polymer carrier formed from the ethylenicallyunsaturated monomer is equal to or greater than 30 parts of stabilizer compound(s), per 100parts of polymer carrier and for instance, the residual monomer content of the polymer carrierafter the polymerisation is below 2000 ppm.For instance, the process comprises the stepsi) dissolving, emulsifying or dispersing the light stabilizer compound(s) in at least oneethylenically unsaturated monomer;ii) preparing a conventional oil in water emulsion of said stabilizer compound(s) dissolved,emulsified or dispersed in at least one ethylenically unsaturated monomer in the presence ofa non-ionic, cationic or anionic surfactant;iii) homogenizing the conventional emulsion to a miniemulsion wherein the droplets of theorganic phase have an average diameter below 1000 nm;iv) polymerizing the miniemulsion by adding a polymerization initiator.For instance, the product of the heterophase polymerisation process has a solids content ofat least 20%, preferably at least 30%, most preferably at least 35%. For example, theproduct of the heterophase polymerisation process has a solids content of up to 70%,especially 60%.Typically, the particle size distribution of the small droplets of ethylenically unsaturatedmonomer and stabilizer compound(s) does not substantially change during polymerisation.Optionally other water miscible solvents may be present usually 0.01-100%, especially 5-100% by weight based on the stabilizer compound(s) content. Exemplary co-solvents usefulin the present invention may be selected from the group consisting of aliphatic alcohols,glycols, ethers, glycol ethers, pyrrolidines, N-alkyl pyrrolidinones, N-alkyl pyrrolidones,polyethylene glycols, polypropylene glycols, glycerol, amides, carboxylic acids and saltsthereof, esters, organosulfides, sulfoxides, sulfones, alcohol derivatives, hydroxyetherderivatives such as butyl carbitol or cellosolve, amino alcohols, ketones, and the like, as wellas derivatives thereof and mixtures thereof. Specific examples include methanol, ethanol,propanol, dioxane, ethylene glycol, propylene glycol, diethylene glycol, glycerol, dipropyleneglycol, tetrahydrofuran, and other water-soluble or water-miscible materials, and mixturesthereof.For instance, depending on the intended and application the water miscible solvent remainsin the product form or is removed after the polymerisation by e.g.vacuum distillation.Preferred are water, water alcohol mixtures, water ethylene glycol or propylene glycolmixtures, water acetone, water tetrahydrofurane, water glycerol or water dimethylformamidemixtures, especially water, in particular water without an organic solvent, such as waterwithout a water-miscible solvent.In a special process variant, a preformed polymer is added to the stabilizer compound(s) andmonomer in process step i), ii) and / or iii). This polymer may preferably be soluble in themonomer and may support the process steps i), ii) and / or iii), i.e. may support the formationof a nanodisperse emulsion of stabilizer compound(s) and monomer in water.Suitable surfactants or surface active compounds, which may be added are known in the art.The amounts typically used range from 0.01% by weight to 10.0% by weight, especially from2.0% by weight to 8.0% by weight, very especially from 3.0% by weight to 7.0% by weight,based on total amount of monomer(s) and active substance(s) (i.e. light stabilizer of formula(I) and hindered amine-based light stabilizer and optionally further additives comprised by thepolymer carrier).Examples for anionic surfactants (which are preferred for polymer carriers prepared byheterophase radical polymerization of at least one ethylenically unsaturated monomer in thepresence of components b1), b2) and b3)) are alkali and ammonium salts of sulphonic acid(e.g. C12-C18alkylsulfonic acid), mono- or dialkylsulfosuccinates, or sulfuric acid halfesters ofethoxylated alkanoles, especially poly(oxy-1,2-ethanediyl), a-sulfo-o-hydroxy-, C12-14-alkylethers, sodium salts (CAS no. 68891-38-3). Some compounds are known for example fromUS4269749 and largely items of commerce, such as under the trade name Dowfax® 2A1(Dow Chemical Company).Examples for cationic surfactants (which are preferred for emulsions, comprisingcomponents b1), b2) and b3)) are C1-C2-alkyl sulfate, tosylate or halogenide salts ofquaternary tetra alkyl ammonium compounds such as dodecyl dimethylethyl ammonium ethylsulfate, dodecyltrimethylammonium chloride, dimethyldidecylammonium chloridehexadecyltrimethylammonium chloride, cetyltrimethylammonium bromide, C8-C18-alkyl benzyldimethylammonium chloride, 3-(dodecylamino)-2-hydroxypropyl)trimethylammoniumtosylate, or C1-C2-alkyl sulfate or halogenide salts of quaternary tetra alkyl ammoniumcompounds, where one, two or three alkyl groups are alkoxylated substituents such aspoly(oxy-1,2-ethanediyl), α,α-methyl-(9Z)-9-octadecenyliminiodi-2, 1-ethanediylbis-Ω--hydroxy-, methyl sulfate or 1-octahexadecanaminium, N,N-polyethoxylate, N-methyl, methylsulfate.The ethylenically unsaturated monomer is preferably selected from the group consisting ofC1-C20alkyl acrylates, C1-C20alkyl methacrylates, acrylic acid, methacrylic acid, styrene,vinyltoluene, hydroxy-functional acrylates or methacrylates, acrylates or methacrylatesderived from alkoxylated alcohols and multifunctional acrylates or methacrylates or mixturesthereof.More preferably, the ethylenically unsaturated monomer is a mixture of methyl methacrylate,stearyl-methacrylate, butanediol diacrylate and methacrylic acid; or a mixture of methylmethacrylate, isobutyl methacrylate, vinyl toluene, cyclohexyl methacrylate, 2-hydroxyethylmethacrylate, stearyl methacrylate and butanediol diacrylate.The homogenization step ii) and iii) is usually carried out by applying mechanical agitation(rotor / stator disperser) or / and followed by using high force dispersion devices like forexample a ultrasonic sound equipment (J. Dispersion Sci. Technology 2002, 23(1-3), 333-349) or a high pressure homogenizer (APV Gaulin homogenizer; Microfluidizer). Theemulsification / homogenization can be carried out continuously or batchwise. Apparatus forthis purpose are known in the art. This is for example described in US5108654.The polymerization step iv) is usually carried out by adding a free radical polymerizationinitiator.Preferably the free radical initiator is present in an amount of from 0.01 weight-% to 20weight-%, more preferably from 0.1 weight-% to 10 weight-% and most preferably from 0.2weight-% to 5 weight-%, based on the monomer or monomer mixture.The polymerization initiator may be added batchwise or continuously to the reaction mixture.Preferably the free radical initiator of component ii) is a redox initiator system or aphotoinitiator, especially a bis-azo compound, a peroxide or a hydroperoxide, especially ahydroperoxide.Specific preferred radical sources are 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methyl-butyronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(4-methoxy-2,4-dimethylvale-ronitrile), 1,1'-azobis(1-cyclohexanecarbonitrile), 2,2'-azobis(isobutyramide) dihydrate, 2-phenylazo-2,4-dimethyl-4-methoxyvaleronitrile, dimethyl-2,2'-azobisisobutyrate, 2-(carbamoylazo) isobutyronitrile, 2,2'-azobis (2,4,4-trimethylpentane), 2,2'-azobis(2-methylpropane), 2,2'-azobis(N,N'-dimethyleneisobutyramidine), free base or hydrochloride,2,2'-azobis(2-amidinopropane), free base or hydrochloride, 2,2'-azobis{2-methyl-N-[1,1-bis(hydroxymethyl)ethyl]propionamide} or 2,2'-azobis{2-methyl-N-[1,1-bis(hydroxymethyl)-2-hydroxyethyl]propionamide; acetyl cyclohexane sulphonyl peroxide, diisopropyl peroxydicarbonate, t-amyl perneodecanoate, t-butyl perneodecanoate, t-butyl perpivalate, t-amylperpivalate, bis(2,4-dichlorobenzoyl)peroxide, diisononanoyl peroxide, didecanoylperoxide, dioctanoyl peroxide, dilauroyl peroxide, bis (2-methylbenzoyl) peroxide, disuccinicacid peroxide, diacetyl peroxide, dibenzoyl peroxide, t-butyl per 2-ethylhexanoate, bis-(4-chlorobenzoyl)-peroxide, t-butyl perisobutyrate, t-butyl permaleinate, 1,1-bis(t-butylperoxy)3,5,5-trimethylcyclohexane, 1,1-bis(t-butylperoxy)cyclohexane, t-butyl peroxyisopropyl carbonate, t-butyl perisononaoate, 2,5-dimethylhexane 2,5-dibenzoate, t-butylperacetate, t-amyl perbenzoate, t-butyl perbenzoate, 2,2-bis (t-butylperoxy) butane, 2,2 bis(t-butylperoxy) propane, dicumyl peroxide, 2,5-dimethylhexane-2,5-di-t-butylperoxide, 3-t-butylperoxy 3-phenylphthalide, di-t-amyl peroxide, a, a'-bis(t-butylperoxy isopropyl) benzene,3,5-bis (t-butylperoxy)3,5-dimethyl 1,2-dioxolane, di-t-butyl peroxide, 2,5-dimethylhexyne-2,5-di-t-butylperoxide, 3,3,6,6,9,9-hexamethyl 1,2,4,5-tetraoxa cyclononane, p-menthanehydroperoxide, pinane hydroperoxide, diisopropylbenzene mono-a-hydroperoxide, cumenehydroperoxide or t-butyl hydroperoxide, particularly preferred is t-butyl hydroperoxide.It is also possible to use combinations of Fe-compounds or Co-compounds with peroxo saltsor salts of bisulfites or hydrosulfites or ascorbic acid. These combinations are known asredox systems.The polymerization temperature depends on the initiator used. Usually the polymerizationtemperature is in the range of 5 °C to 95° C and preferably from 30 °C to 90 °C. If pressure isapplied the temperature can raise up to 120 °C, however, polymerization under normalpressure is the usual process.Alternatively the polymerization can be initiated by photoinitiators and electromagneticradiation, in particular actinic radiation.Photoinitiators suitable for use in the process according to the invention are in principle anycompounds and mixtures that form one or more free radicals when irradiated with electro-magnetic waves. These include initiator systems consisting of a plurality of initiators andsystems that function independently of one another or synergistically. In addition tocoinitiators, for example amines, thiols, borates, enolates, phosphines, carboxylates andimidazoles, it is also possible to use sensitisers, for example acridines, xanthenes, thiazenes,coumarins, thioxanthones, triazines and dyes. A description of such compounds and initiatorsystems can be found e.g. in Crivello J.V., Dietliker K.K., (1999): Chemistry & Technology ofUV & EB Formulation for Coatings, Inks & Paints, and in Bradley G. (ed.) Vol. 3: Photo-initiators for Free Radical and Cationic Polymerisation 2nd Edition, John Wiley & Son Ltd.The photoinitiator suitable for the process according to the invention in step b) may be eitheran initiator having an unsaturated group or an initiator not having such a groupSuch compounds and derivatives are derived, for example, from the following classes ofcompounds: benzoins, benzil ketals, acetophenones, hydroxyalkylphenones, aminoalkyl-phenones, acylphosphine oxides, acylphosphine sulfides, acyloxyiminoketones, alkylamino-substituted ketones, such as Michler's ketone, peroxy compounds, dinitrile compounds,halogenated acetophenones, phenylglyoxylates, dimeric phenylglyoxalates, benzophenones,oximes and oxime esters, thioxanthones, coumarins, ferrocenes, titanocenes, onium salts,sulfonium salts, iodonium salts, diazonium salts, borates, triazines, bisimidazoles, poly-silanes and dyes. It is also possible to use combinations of the compounds from thementioned classes of compounds with one another and combinations with correspondingcoinitiator systems and / or sensitisers.The polymerisation initiator can also be one of the group of thermally reacting water solubleor oil soluble initiators such as persulfates (e.g. ammonium or potassium salt thereof) orhydrochloride salts of diazo compounds such as 2,2'-azobis(2-(2-imidazolin-2-yl)propane)dihydrochloride, CAS 27776-21-2, for introduction into the water phase before or after thepreparation of the miniemulsion. Oil soluble peroxides such as dilauroyl peroxide, dicetylproxydicarbonate, tert-amyl peroxyneodecanoate, tert-amyl peroxypivalate and tert-butylperoxy-2-ethylhexanoate, as well as AIBN are dissolved in the monomer phase prior to thepreparation of the miniemulsion.The final aqueous product form might be stabilized with a biocide against fungal, bacterial oralgae growth, for instance, with biocidically active amount of commercially available productscontaining CIT, MIT, BIT, phenoxyethanol, 4-hydroxybenzoic alkyl esters (Nipagin,Phenonip), or combinations thereof.Impregnating ResinThe impregnating resin comprises at least on resin component A, which is selected fromaminoplast resins and phenoplast resins and mixtures thereof.Aminoplast resins are polycondensation products of one or more amino compounds and oneor more aldehydes. Useful amino compounds in this respect are primary amines having atleast two primary amino groups, in particular 2 or 3 primary amino groups. These amines arepreferably characterized in that each of their primary amino groups is attached to a carbonatom, which is linked via a double bond to an oxygen atom, sulfur atom or nitrogen atom.Preferred examples of such amines are urea, thiourea, melamine, cyanoguanamine (=dicyandiamide), acetoguanamine and benzoguanamine. Useful aldehydes in this respect areC1-C10-alkanals, especially C1-C4-alkanals, such as formaldehyde, acetaldehyde, propanal orn-butanal, and C2-C10-alkandials, especially C2-C6-alkandials, such as glyoxal orglutaraldehyde. Preferred aldehydes are formaldehyde, glyoxal and glutaraldehyde, inparticular formaldehyde. The aminoplast polymer may be partially or wholly etherfied byalkanols, in particular C1-C4-alkanols such as methanol, ethanol, n-propanol or n-butanol.Examples of aminoplast resins include, but are not limited to melamine-formaldehyde resins(= MF resins), including wholly or partially etherified MF resins, urea- formaldehyde resins (=UF resins), thiourea-formaldehyde resins (= TUF resins), melamine-urea-formaldehyderesins (= MUF resins), including wholly or partially etherified MUF resins, melamine-thiourea-formaldehyde resins (= MTUF resins), including partially etherified MTUF resins, urea-glutaraldehyde resins, benzoguanamine-formaldehyde resins, dicyandiamide-formaldehyderesins and urea-glyoxal resins, i.e. from polymers that are obtained by polycondensation ofmelamine, urea, thiourea, melamine / (thio) urea mixtures, benzoguanamine or dicyandiamidewith formaldehyde, by polycondensation of urea with glutaraldehyde, or by polycondensationof urea with glyoxal.Phenoplast resins are polycondensation products of one or more phenolic compounds suchas phenol, resorcin, hydroxytoluene or hydroxyxylene, and one or more aldehydes, inparticular C1-C10-alkanals, more particularly C1-C4-alkanals, especially formaldehyde.Examples of phenoplast resins include but are not limited to novolaks and resoles.Preferably, the resin composition A comprises at least one aminoplast resin, in particular inan amount of at least 30% by weight, in particular at least 50% by weight, especially at least70% by based, based on the total weight of resin solids in component A. Especially, the resincomposition A consists of at least one aminoplast resin.Preferably, the resin composition A comprises at least 30% by weight, in particular at least50% by weight, especially at least 70% by based, based on the total weight of resin solids incomponent A, of an aminoplast resin, which is selected from the group consisting of MFresins, including wholly or partially etherified MF resins, MUF resins, including wholly orpartially etherified MUF resins, and UF resins. In particular, the resin composition Acomprises at least 30% by weight of a MF resin, and especially a wholly or partially etherifiedMF resin.In the resin-impregnated sheet or web of the fibrous material, the resin component A istypically still reactive, i.e. it is not fully crosslinked and thus can be further crosslinked to aduroplastic polymer, when the resin-impregnated sheet or web is laminated to a surface toprovide a plastic surface of a panel.Typically, the resin composition A are essentially the sole resin components of theimpregnating resin. However, the impregnating resin may contain one or more resinsdifferent from the resins of resin component A. The amount of such resins will generally notexceed 10% by weight, based on the total resin solids of the impregnating resin.The impregnating resin may comprise one or more additives typically used in impregnatingresins for impregnating fibrous materials. These additives include but are not limited tohardeners, e.g. acids which effect hardening of the resin component A, wetting agent suchas mixtures of surfactants, e.g. the commercial products DeuroWET MA 30 or ALTON WLF-15, release agents, in particular parting-active ester compounds, such as phosphate esters,e.g. the commercial products DeuroLEASE PHO or ALTON R 1014, anti-dusting agents suchas salts of phosphate esters ALTON ES 711, anti-blocking agents, such as polymers andpolymer blends, including silicones, fluoropolymers, or waxes, typically in the form ofdispersions, e.g. the commercial products ALTON AT 839 or DeuroSLIDE PG. Examples ofsuitable hardeners include but are not limited to weak acids, e.g. carboxylic acids, such asmaleic acid, and ammonium salts, such as ammonium sulfite, ethanolamine hydrochlorid, N-methylethanolammonium sulfite, N,N-dimethylethanolammonium sulfite, the morpholine saltof toluene sulfonic acid, and combinations of N-methylethanolamine / SO2 andethanolamine / N-methylethanolamine / SO2. In a preferred embodiment of the presentinvention the ESQ, such as, for example, (tris(tetramethylhydroxypiperidinol) citrate, actsalso as hardener.The fibrous material to be impregnated, i.e. the non-impregnated sheet or web of fibrousmaterial, may be fibrous material in the form of a sheet or a web which is commonly used forthe production of resin impregnated sheets or webs for providing plastic surfaces. Prior toimpregnation, the sheet or web of the fibrous material may have a grammage in the range of15 to 300 g / m², in particular in the range of 15 to 250 g / m². Here and in the following, thegrammage refers to weight per area as defined and determined according to DIN EN ISO536:2020-05.For example the non-impregnated fibrous material may be a sheet or web of paper orcardboard, which preferably has a grammage in the range of 15 to 300 g / m², in particular inthe range of 15 to 250 g / m², including printed or uni decor paper having typically agrammage in the range of 30 to 200 g / m², preferably in the range of 40 to 150 g / m²; overlaypaper, such as non-filled overlay paper or corundum filled overlay paper having typically agrammage in the range of 15 to 60 g / m²; Kraft paper having typically a grammage in therange of 40 to 300 g / m², preferably in the range of 50 to 250 g / m²; packaging paper havingtypically a grammage in the range of 40 to 300 g / m², preferably in the range of 180 to 250g / m²; and fibre reinforced paper, e.g. paper reinforced by nature fibre, plastic fibre or carbonfibre having typically a grammage in the range of 30 to 300 g / m², preferably in the range of50 to 250 g / m².For example the non-impregnated sheet or web of the fibrous material may also be a sheetor web of a textile material or a non-woven, e.g. a textile or non-woven based on naturalfibres such as cotton fibre, flax fibre, sisal fibre, hemp fibre or mixtures thereof, includingmixtures with syntheric fibres, such as glass fibre, synthetic fibre and carbon fibre, non-wovens based on synthetic fibres, non-wovens based on glass fibre and mixtures thereofwith plastic fibres. Suitable textiles and non-wovens may have a grammage in the range of30 to 300 g / m² prior to impregnation.The total amount of impregnating resin in the resin-impregnated fibrous material will ofcourse be dependent from the grammage of the non-impregnated sheet or web of the fibrousmaterial. For example, the total amount of impregnating resin in the resin- impregnatedfibrous material may be in the range of 10 to 80% by weight, based on the total weight ofimpregnated sheet or web and is preferably in the range of 30 to 70% by weight, in particularin the range of 45 to 65% by weight of the impregnated sheet or web of the fibrous material,where the resin is calculated as resin solids. The grammage of the resin-impregnated sheetor web of fibrous material is typically in the range of 20 to 800 g / m², in particular in the rangeof 30 to 700 g / m², depending on the grammage of the sheet or web used for impregnation. Incase of a resin impregnated paper having a grammage in the range of 40 to 150 g / m², thetotal amount of resin is in particular in the range from 30 to 100 g / m², in particular in therange of 40 to 90 g / m².The resin-impregnated fibrous material can be produced by analogy to well-knowntechniques of impregnating sheets or webs of fibrous materials with impregnating resins. Forthis, the sheet or a web of the fibrous material is impregnated with a liquid resin formulationcomprising the resin component A.In the liquid resin formulation, the resin component A is preferably present in the form of apre-condensate, i.e. it is essentially not crosslinked. For example, the degree of crosslinkingof the resin component A in the liquid resin formulation is at most 10% or even 0% asdetermined by the procedure described in US2010 / 282407. Typically, the pre-condensate isan monomer, an oligomer having on average (number average) from 2 to 20 repeating unitsor a polymer having on average (number average) from 21 to 500 repeating units or amixture thereof. The degree of oligomerization / polymerization can be determined by gelpermeation chromatography as described in the art, e.g. by Jeong et al., J. Korean WoodSci. Technol. 2016, 44(6): 913-922.In addition, the liquid resin formulation contains a solvent, which is capable of dissolving oremulsifying the resin component A. Suitable solvents include but are not limited to water, C1-C4alkanols and mixtures thereof. Preferably, the liquid resin formulation is an aqueous resincomposition, which besides the resin does not contain more than 10% by weight of organicsolvents. In addition to the resin component A, the liquid resin formulation may contain oneor more additives typically used in liquid resin formulations for impregnating fibrous materials.These additives include but are not limited to the aforementioned hardeners, release agents,anti-dusting agents and blocking agents.Typically, the liquid resin formulation has a viscosity that allows the resin to penetrate into thefibrous material to be impregnated while providing good handling and uniform application ofthe liquid resin formulation. Frequently, the liquid resin formulation has a viscosity in terms offlow time, determined according to DIN EN ISO 2431 :2018-08 at 20°C with 4 mm nozzle ofnot more than 35 s in particular in the range of 10 to 15 s. The solids content of the liquidresin formulation is typically in the range of 30 to 60% by weight as determined e.g. by DINEN 827:2006-03.The impregnation can principally be achieved by any method of impregnating a sheet or webof a fibrous material. Typically, the liquid resin formulation to at least one of the surfaces ofthe sheet or the web of the fibrous material. The sheet or the web of the fibrous material maybe a non-impregnated sheet or web, or it may be a pre-impregnated material that still hascapacity to absorb further liquid impregnating resin composition.The application of the liquid resin formulation can be achieved by any conventionaltechniques for impregnation of a porous sheet or web substrate with a liquid resinformulation. For example, the liquid resin formulation containing the resin component A canbe applied as a liquid coating onto one or both surfaces of the sheet or web, by conventionalcoating techniques such as slot nozzle coating, squeegee coating, spray coating, rollercoating, anilox coating, reverse coating, cascade or curtain casting, by means of a glueingpress or by immersing the sheet or web in the liquid resin formulation or by combinations orthe aforementioned impregnation techniques.Preferred methods for impregnating a sheet or a web of a fibrous material will now bedescribed with reference to FIG. 1 of WO202208671A1 which is a schematic view of anapparatus for carrying out the impregnation by dipping, and FIG. 2 of WO202208671A1which is a schematic side view of an apparatus for carrying out the impregnation by rollingapplication.As shown in FIG. 1 of WO202208671A1, an embodiment for carrying out the impregnationcomprises a web 1, a resin applicator 19 and a dryer 14 to prepare a resin impregnated web2. The resin applicator 19 comprises a resin tank 17 with a resin composition of theinvention, a pre wetting roller 18, a spreader rollers (banana roller) 12, dipping rollers 16,metering rollers 15 and smoothening rollers 13. The web 1 is passed through the resin tank17 by means of the wetting roller 18 and then passed to the spreader rollers 12. Between thewetting roller 18 and the spreader roller 12 there is a rest section 11, also called breathingsection, so that the resin composition can penetrate the web 1. After passing the spreaderrollers 12, the web is again passed through the resin tank 17. The web is moved to a dryer14 with a system of dipping rollers 16, metering rollers 15 and smoothening roller 13. Thedryer 14 is downstream in the transport direction of the applicator 19 and may be a hot dryer,a circulating-air dryer or a circulating-air, flotation dryer. In the further course the impregnatedweb can be rewound into rolls with a rewinding station or cut into sheets by means of a rotarycross cutter and deposited on pallets provided.As shown in FIG. 2 of WO202208671A1, a further embodiment for carrying out theimpregnation comprises a web 1', a resin applicator, e.g. a so-called gravure coater station,27 and a dryer 25 to prepare an impregnated web 2'. The resin applicator 27 comprises aweb aligner roll 26, gravure rolls 23a and 23b, smoothening rollers 24, doctor blades 22a and22b and resin tanks 21a and 22a each with a resin composition of the invention. A web 1' isguided by means of the web aligner roll 26 and then along the upstream gravure roll 23a andthe downstream gravure roll 23b to the smoothening roller 24 and to the dryer 25. A doctorblade 22a is set with a small spacing against the upstream gravure roll 23a, downstream ofthe web aligner roll 26, i.e. after the web aligner roll 26 in the direction of transport. A doctorblade 23b is set with a small spacing against the downstream gravure roll 23b, i.e. before thedownstream gravure roll 23b in the direction of transport. The gravure rolls 23a and 23b haverecesses to receive the resin composition of the invention, provided by the doctor blades 22aand 22b. The doctor blades 22a and 22b are each connected to a resin tank 21a and 22a,respectively, comprising the resin composition of the invention. The dryer 25 may be a hotdryer or a circulating-air dryer. In the further course the impregnated web can be rewoundinto rolls with a rewinding station or cut into sheets by means of a rotary cross cutter anddeposited on pallets provided.After impregnation, the impregnated web or sheet is dried to remove volatile components.Drying is typically carried out at elevated temperatures e.g. in the range of 80 to 220°C.Typically drying is achieved by using a vented oven or by IR radiators. Typically drying iscarried out until the residual moisture is in the range of 4.5 to 8.0%. The residual moisture, asreferred herein, is determined by the gravimetric drying oven method at 160°C and 5 minutesdrying time according to DIN EN ISO 638:2009-01. It is calculated from the difference of theweight of a specimen before drying and the weight after drying and given in % by weight,based on the weight before drying. The drying typically results in a partial crosslinking of theresin component A. The resultant impregnated sheets or webs can then be further processedconventionally, in case of webs e.g. wound up to give rolls or cut into sheets.Preferably, the resin composition A contains an aminoplast resin. This aminoplast resin ispreferably selected from UF resins, including wholly or partially etherified UF resins, MUFresins, including wholly or partially etherified MUF resins, and MF resins, including wholly orpartially etherified MF resins. In the liquid resin formulation of the first step, the resincomponent A is preferably present in the form of a pre-condensate, i.e. it is essentially notcrosslinked. For example, the degree of crosslinking of the resin component A in the liquidresin formulation is at most 10% or even 0%.Besides the resin component A, the liquid resin formulation may contain one or more of theaforementioned additives typically used in liquid resin formulations for impregnating fibrousmaterials. Preferably, the first liquid resin formulation is an aqueous resin composition, whichbesides the resin does not contain more than 10% by weight of organic solvents.Step i) is typically carried out by conventional impregnation methods used for impregnating asheet or web of fibrous material with a liquid resin composition. For example, the sheet orweb of fibrous material is impregnated by immersing the sheet or web in the liquid resinformulation, whereby the liquid resin formulation penetrates into the pores of the sheet orweb of the fibrous material. Any adherent liquid resin formulation may be removed by bladesor rollers. A suitable resin applicator for carrying out step i. is shown in Fig. 1 of ofWO202208671A1. However, any other application method as described above may beapplied.The resin impregnated sheets or webs of the fibrous material can be used by analogy toknown resin impregnated sheets or webs for providing plastic surfaces, in particularduroplastic surfaces, on arbitrary panels or boards, respectively.Therefore, the present invention also relates to a process for providing a panel with a plasticsurface, in particular with a duroplastic surface, which comprises providing a sheet or a webof a resin-impregnated fibrous material as disclosed herein on at least one surface of thepanel. For example, the plastic surface may be provided by laminating a resin impregnatedsheet or web of the present invention to at least one surface of the panel or board,respectively. Alternatively, the resin impregnated sheets or webs of the present invention canbe used as outer layers in the production of a laminate.Suitable panels include but are not limited towood-based panels, such as chipboards, fiberboards, for example, MDF boards (mediumdensity fiberboard), FIDF boards (high density fiberboard) or OSB boards (oriented structuralboard), boards of wood plastic composites (WPC boards);stone plastic composite boards (SPC boards); mineral material panels, also termed solidsurface boards or solid surface panels, e.g. panels of the trademarks VARICOR®, CORIAN®,KRION® etc.;- laminates, such as high pressure laminates (HPL) and continuous pressure laminates(CPL). For this, a resin impregnated sheet of the present invention is laminated to at leastone surface of the panel. For lamination, typically a resin impregnated sheet of the presentinvention is pressed to at least on surface of the panel at elevated temperature. In theproduction of CPL, which are typically prepared by laying several resin impregnated paperlayers on top of one another and pressing them at elevated temperature, the resinimpregnated sheet of the present invention will form the outer layer(s).The process for providing a sheet or a web of a resin-impregnated fibrous material asdisclosed herein on at least one surface of the panel or board, is typically carried out atelevated temperature and elevated pressure, to achieve a high degree of crosslinking of theresin components, namely of the resin component A and thus a duroplastic surface and agood adhesion of the plastic surface. These conditions are similar to the conditionsconventionally used in the production of products having a plastic surface obtained byproviding a resin impregnated sheet or web onto the surface of a board or panel. Thetemperature is typically in the range from 130 to 230°C, in particular 140 to 220°C. Thepressure applied is typically in the range of 10 to 100 kg / cm². Pressure and heat are typicallyapplied for a duration in the range of 5 s to 100 seconds. Suitable presses for applying thenecessary pressure include but are not limited to short cycle presses (KT presses), multi-stack recooling presses or double belt presses are suitable for this purpose. Temperature,applied pressure and duration, however, may vary in a known manner from the type of theboard to be coated and the press used for this purpose. Standard values are given in thefollowing table:PressTemperature [°C]PressureDuration[kg / cm²]Standard values for LPL1) on KT170-22020-308-30 spressesStandard values for HPL2) on multi-140-18070-9045-90stack recooling pressesminutesStandard values for CPL³) on double170-20025-7015-30belt pressesminutes1) LPL: Low pressure laminate, i.e. a laminate having an outer plastic layer obtained bylaminating a resin impregnated sheet or web to an existing board.2) HPL: High pressure laminate.3) CPL: continuous pressure laminate.The panels having a plastic surface formed by a laminated resin- impregnated sheet or webof the present invention provide in particular beneficial adherence of coatings formed fromcrosslinkable varnish formulations including radiation curable formulations and thermallycurable varnishes such as 1 K or 2K polyurethane formulations.Therefore, the invention also relates to panels having a plastic surface formed by a laminatedresin-impregnated sheet or web of the present invention, i.e. panels having a plastic surface,which are obtainable by a the method of laminating resin-impregnated sheet or web of thepresent invention to the surface of the present invention and also panels having a plasticsurface formed by a laminated resin-impregnated sheet or web of the present invention andwhich further comprise a varnish on the plastic surface. Typical varnish formulations, whichcan be successively applied to the plastic surface of the board obtained from the laminationof the resin-impregnated sheet or web of the present invention to a panel include aqueousand non-aqueous liquid coating formulations, including radiation curable varnishformulations, solventborne and waterborne 2K varnish formulations such as 2K polyurethanecoatings, solvent borne and waterborne 1 K varnish formulations such a 1 K polyurethanecoating formulations and waterborne coating formulations containing an aqueous polymerdispersion as a binder. The polymer dispersion may be crosslinkable or non-crosslinkableand is preferably crosslinkable. The varnish formulations can be applied to the plastic surfaceby any conventional coating techniques for applying coating formulations, in particular liquidcoating formulations, onto surfaces, including brushing, spraying doctoring, rolling, casting,curtain coating and the like. The varnish may be cured by high energy radiation, including UVradiation or electron beams, or by heating. In case of physically drying liquid coatingformulations, it may be sufficient that the coating formulation is dried at ambient temperature.In another embodiment the present invention relates to a concentrated aqueous polymerdispersion with an average particle size of less than 1000 nm (i.e. droplets of ethylenicallyunsaturated monomer and components b1) and b2) with an average particle size of less than1000 nm), comprisinga) a polymer carrier prepared by heterophase radical polymerization of at least oneethylenically unsaturated monomer in the presence ofb1) at least one light stabilizer of formula (I);b2) at least hindered amine-based light stabilizer; andc) cationic or anionic surfactant preferably by heterophase radical polymerization,wherein the at least one hindered amine-based light stabilizer is a hindered amine lightstabilizer of formula(Ilb), whereinY¹ is -(CH2)y, whereinR is H, CH3, OC8H17, or OC6H11;(llb1), wherein R isy is an integer of 6 to 10, especiallyH, CH3 or OC8H17; sndthe at least one light stabilizer of formula (I) is mixture of a compound of formula(Ib), whereinR5', R5", R7' and R7" are hydrogen, or C1-C6alkyl, especially C1-C3alkyl, and a compound of(Ic), especially(Ic'), whereinR51, R52, R53, R54 and R55 are as defined in claim 1 and are preferably hydrogen.Z is (CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14;n1 is 0 or 1;R12 is C1-C18alkyl or C6-C12aryl or CO-C1-C18alkyl;R13 is H or C1-C8alkyl; R14 is C1-C12alkyl or C2-C12alkenyl or C5-C6cycloalkyl, andthe ethylenically unsaturated monomer is selected from the group consisting of C1-C20alkylacrylates, C1-C20alkyl methacrylates, acrylic acid, methacrylic acid, styrene, vinyltoluene,hydroxy-functional acrylates or methacrylates, acrylates or methacrylates derived fromalkoxylated alcohols and multifunctional acrylates or methacrylates or mixtures thereof;an aqueous coating composition, comprising the concentrated aqueous polymer dispersionaccording to claim 15 and c) optionally an Excited State Quencher (ESQ), especially acompound of formula(tris(tetramethylhydroxypiperidinol) citrate); and the use of the aqueous coating compositionfor the production of clear-coats, in particular for concrete floorings, for plastics, for claddingand as overcoat for metallic coatings.The examples below serve to illustrate the invention without limiting it in any way.ExamplesThe following abbreviations were used:wt%: % by weightSMA: stearyl methacrylateMMA: methyl methacrylateMAA: methacrylic acidBDDA: butanediol diacrylateIBMA: isobutyl methacrylateVT: vinyl tolueneCHMA: cyclohexyl methacrylateHEMA: 2-hydroxyethyl methacrylatenBA: n-butyl acrylateAMP90: 90% aq. solution of 2-amino-2-methylpropanolD50: particle size at 50% of the volume distributionPDI: polydispersity = sigma value of distribution / D50 valueSC%: dry solid content in percentnm: nanometersnd: value not determinedAnalytics:Particle size (and droplet size) was determined by using a NANO-flex particle sizer fromMicrotrac using 780 nm laser light (3 mW) at a 180° scattering angle. Measurements weredone with samples diluted to the required concentration with demineralized water at roomtemperature. D50 values reported refer to the volume fraction of the distribution and thepolydispersity was calculated from the sigma value of the distribution divided by the D50value.Solid contents were measured on a Mettler Toledo HR 73 halogen dryer at 150 °C untilconstant weight of a 0.5 to 0.8 g sample. The result is expressed in dry wt%.Viscosity was determined with a Brookfield Rheometer using an LV-02 spindle at 23 °C and60 rpm. The results are expressed in mPas.Materials used:Light stabilizers:L1: 2-[4-[2-Hydroxy-3-tridecyloxypropyl]oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine and 2-[4-[2-hydroxy-3-didecyloxypropyl]oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine (Tinuvin® 400) fromBASF SE, GermanyL2: Propanoic acid,2-[4-[4,6-bis([1,1'-biphenyl]-4-yl)-1,3,5-triazin-2-yl]-3-hydroxyphenoxy]-, isooctyl ester (Tinuvin® 479) from BASF SE, GermanyL3: Decanedioic acid, bis(2,2,6,6-tetramethyl-4-piperidinyl)ester,reactionproducts with tert-Bu hydroperoxide and octane (Tinuvin® 123) fromBASF SE, Germany.L4: Reaction mass of (3R)- and (3S)-Isomers of 3,5,5-Trimethyl-hexanoic acid2-[2,2,6,6-tetra-methyl-4-(3,5,5-trimethyl-hexanoyloxy)-piperidin-1-yl]-ethylester (cpd. B-2; cpd. of example 2 of EP3019474).Surfactants used:S1: Sodium salt of a semi-ester of sulfuric acid with an ethoxylated laurylalcohol, 31 wt% in water from BASF SE, GermanyS2: Mixture of reaction products of D-Glucose with C10-C16 (even numbered)alcohols and D-Glucopyranose, oligomers, decyl octyl glycosides (ratio 5:1) asa 52% aqueous solution from BASF SE, GermanyS3: Butanedioic acid, sulfo-, 1-C12-18-alkyl esters, disodium salt from BASF SE,GermanyS4: Alkyldiphenyloxide disulfonate, 49 wt% in water from Dow, USAS5: Bis(2-ethylhexyl) sulfosuccinate sodium salt, 77% solution inwater / propylene glycol from BASF SE, GermanyS6: Poly(oxy-1,2-ethanediyl),.alpha.,.alpha.-methyl-(9Z)-9-octadecenyliminiodi-2,1-ethanediylbis---hydroxy-, methyl sulfate, 37% solution in water from BASF SES7: Sodium-n-alkyl-(C10-C13) benzene sulphonate, 20% in water from BASFSE, GermanyS8: Sodium dodecyl sulfonate, 15% in water from BASF SE, GermanyS9: Cetyl trimethyl ammonium chloride, 25% in water from BASF SE, GermanyMonomer compositions for encapsulation polymers in wt%:M1: ΜΜΑ 89,7%, SMA 8,0%, MAA 2,0% and BDDA 0,3%M2: ΜΜΑ 25,7%, iBMA 28,0%, VT 14,0%, CHMA 14,0%, HEMA 10,0%, SMA8,0%, BDDA 0,3%M3: ΜΜΑ 25,7%, iBMA 40,0%, VT 4,0%, CHMA 10,0%, HEMA 10,0%, SMA10,0%, BDDA 0,3%M4: ΜΜΑ 25,7%, iBMA 20,0%, VT 4,0%, CHMA 10,0%, HEMA 10,0%, SMA10,0%, nBA 20,0%, BDDA 0,3%M5: ΜΜΑ 25,7%, iBMA 26,5%, VT 14,0%, CHMA 14,0%, HEMA 10,0%, SMA8,0%, ΜΑΑ 1,5%, BDDA 0,3%M6: ΜΜΑ 25,7%, iBMA 18.0%, VT 14,0%, CHMA 14,0%, HEMA 20,0%, SMA8,0%, BDDA 0,3%M7: ΜΜΑ 25,7%, iBMA 28.0%, VT 14,0%, CHMA 4,0%, HEMA 20,0%, SMA8,0%, BDDA 0,3%M8: ΜΜΑ 27,7%, iBMA 28.0%, VT 14,0%, CHMA 14,0%, HEMA 10,0%, SMA6,0%, BDDA 0,3%M9: ΜΜΑ 27,7%, iBMA 16.0%, VT 14,0%, CHMA 4,0%, НЕМА 30,0%, SMA8,0%, BDDA 0,3%M10: ΜΜΑ 26.0%, iBMA 28.0%, VT 14,0%, CHMA 14,0%, HEMA 10,0%, SMA8,0%Preparation of Dispersions:Example 1:In a glass beaker equipped with a magnetic stirring rod, the light stabilizers (66.0 g of L1 and22.0 g of L3) were dissolved in the indicated monomer mixtures (30.9 g of M1) at roomtemperature (RT) until a clear solution was obtained. To this organic phase a solution ofsurfactant (15.3 g of S1) in deionized water (74.1 g) was slowly added in a few minutes whilestirring. The mixture, as a non-stable emulsion, was stirred for 15 min and then treated withultrasound using a Bandelin Sonoplus, Generator GM 2200, 200 W, 20 kHz, at 60% powerfor 20 minutes per 500 g of emulsion. A stable miniemulsion was obtained, wherein theaverage droplet size was D50 = 315 nm.The mini emulsion was placed in a reaction flask equipped with an overhead anchor-typestirrer, cooler, nitrogen inlet and a thermometer, heated to 45 °C and inertized with a N2stream for 15 minutes. Then the peroxide initiator (1.54 g of a 10 wt% aqueous solution of t-butyl hydroperoxide) was added to the miniemulsion in one portion. To the reactor the redoxsystem (6.42 g of a 4.8 wt% aqueous solution of sodium formaldehydesulfoxylate) wasadded in two portions: 30% of the amount in one shot at 45 °C, and the remainder 70% ofthe amount over a period of 1 hour at 60 °C as soon as the exotherm reaction (visibletemperature increase of ca. 12 to 20 °C) had ceased. The obtained dispersion wascontinuously stirred by a mechanical stirrer and was maintained at 60 °C for one additionalhour, then 0.6 g of 10 wt% aqueous solution of t-butyl hydroperoxide was added, followed bydosage of 0.8 g of a 13.1% aq. solution of sodium acetone bisulfite over one hour. Thedispersion was then cooled to 23 °C, pH adjusted into the range 8-10 using a few drops ofAMP90 and was filtered via a 150 µm filter into a bottle. The resulting dispersion had aparticle size D50 of 281 nm with a polydispersity of 0.57. The final active content (based on alllight stabilizers) was 40 wt%, the solid content was 58.6 wt%. The pH was 8.7. The aspectwas an off-white, low viscous (< 100 mPas) non-transparent dispersion.Examples 2-5:According to the procedure of Example 1, the following examples were prepared:Table 1: Examples 2 to 5Ex.LightMono-Sur-H2OtBHP-1 / SFS / Data:stabilizer mers / gfactant / in gtBHP-2 / SABSD50 (PDI), / ggin gSC%, pH2L1 / 66 M2 / 30.9 S1 / 15.3 75.71.48 / 6.2 / 0.6 / 357 nm (0.43),L3 / 220.858.3%, 9.13L1 / 58.7 M2 / 30.9 S1 / 15.3 74.41.53 / 6.4 / 0.6 / 425 nm (0.51),L3 / 29.30.858.3%, 8.84L1 / 66 M2 / 30.9 S1 / 15.3 75.51.49 / 6.2 / 0.6 / 365 nm (0.53),L4 / 220.858.7%, 9.95 L1 / 58.7 M2 / 30.9 S1 / 15.3 74.31.54 / 6.4 / 0.6 / 278 nm (0.44),L4 / 29.30.858.2%, 8.8Examples 6-26:According to the procedure of Example 1, the following examples were prepared with thedifference that no chasing procedure with tBHP / sodium acetone bisulfite was done. Thedispersions were cooled to RT after one hour at 60 °C to finish them in the same way asexample 1:Table 2: Examples 6 to 26Ex.LightMono-Sur-H2OtBHP / SFS / in Data:stabilizer mers [g]factant [g]gD50 (PDI),[g][g]SC%, pH6L1 / 70.5 M2 / 33.0 S4 / 11.3 90.61.7 / 6.9296 nm (0.47),L3 / 23.555.4%, 9.37L1 / 70.5 M3 / 33.0S1 / 16.4 85.51.7 / 6.9310 nm (0.47),L3 / 23.557.2%, 8.88L1 / 62.7 M3 / 33.0 S1 / 16.4 84.01.7 / 6.9265 nm (0.52),L3 / 31.358.3%, 8.89L1 / 70.5 M4 / 33.0S1 / 16.4 85.51.7 / 6.9284 nm (0.54),L3 / 23.558.1%, 8.710L1 / 62.7 M4 / 33.0S1 / 16.4 84.01.7 / 6.9488 nm (0.77),L3 / 31.358.2%, 8.811L1 / 69 M5 / 32.3S1 / 16.0 79.01.6 / 6.7276 nm (0.37),L3 / 2359.2%, 8.812L1 / 69 M6 / 32.3S1 / 16.0 79.01.6 / 6.7358 nm (0.39),L3 / 2357.3%, 8.813L1 / 69 M7 / 32.3S1 / 16.0 79.01.6 / 6.7443 nm (0.36),L3 / 2357.5%, 8.714L1 / 69 M8 / 32.3S1 / 16.0 79.01.6 / 6.7417 nm (0.57),L3 / 2358.1%, 8.815L1 / 69 M10 / 32.3 S1 / 16.0 79.11.6 / 6.7344 nm (0.44),L3 / 2359.2%, nm16L1 / 46 M2 / 32.3 S1 / 16.0 79.01.6 / 6.7314 nm (0.59),L2 / 2358.4%, 8.9L3 / 2317 L1 / 48 M5 / 33.7 S1 / 16.7 82.41.7 / 7.0332 nm (0.45),L2 / 2459.7%, 8.8L3 / 2418L1 / 32 M5 / 33.7S1 / 16.7 82.41.7 / 7.0243 nm (0.37),L2 / 1659.6%, 8.9L3 / 4819L1 / 16 M5 / 33.7 S1 / 16.7 82.41.7 / 7.0215 nm (0.37),L2 / 858.1%, 8.8L3 / 7220L2 / 24 M5 / 33.7 S1 / 16.7 82.41.7 / 7.0241 nm (0.39),L3 / 7259.7%, 8.721L2 / 48M5 / 33.7 S1 / 16.7 82.41.7 / 7.0295 nm (0.41),L3 / 4858.6%, 8.822L1 / 48M5 / 33.7 S2 / 11.9 85.41.7 / 7.0370 nm (0.40),L2 / 24S3 / 1.959.3%, 8.7L3 / 2423 L2 / 50 M5 / 35.1S2 / 12.4 88.91.8 / 7.3507 nm (0.65),L3 / 50S3 / 1.959.2%, 8.724 L2 / 25 M5 / 35.1S2 / 12.4 88.91.8 / 7.3629 nm (0.61),L3 / 75S3 / 1.959.4%, 8.825 L1 / 16.7 M5 / 35.1S2 / 12.4 88.91.8 / 7.3387 nm (0.55),L2 / 8.3S3 / 1.959.3%, 8.7L3 / 7526 L1 / 33.3 M5 / 35.1S2 / 12.4 88.91.8 / 7.3306 nm (0.55),L2 / 16.7S3 / 1.958.8%, 8.8L3 / 50All examples 2 to 26 in above tables were low viscous (< 250 mPas) dispersions with a milky,white to slightly beige appearance. The active contents of the combined light stabilizers wereequally set at 40 wt% in the final product form for easier comparison.Preparation of Emulsions:Example 27In a glass beaker equipped with a magnetic stirring rod, the light stabilizers (47.1 g of L1,20.0 g of L2 and 20.0 g of L3) were dissolved in 30.0 g of ethyl acetate at 40 °C until a clearsolution was obtained. To this organic phase a solution of surfactant (14.2 g of S1) indeionized water (68.8 g) was slowly added while stirring. The mixture, as a non-stableemulsion, was stirred for 10 min and then treated with ultrasound using a Bandelin Sonoplus,Generator GM 2200, 200 W, 20 kHz, at 60% power for 15 minutes, keeping the temperaturebelow 40 °C. A stable light-yellow emulsion was obtained, wherein the average droplet sizewas D50 = 185 nm with a polydispersity of 0.35. The final active content (based on all lightstabilizers) was 40 wt%, the measured solid content was 45.0 wt%. The pH was 7.0 and theviscosity was 146 mPas.Examples 28-37According to the procedure of Example 27, the following examples were prepared:Table 3: Examples 28 to 37. The active contents of the combined light stabilizers wereequally set at 40 wt% in the final product form for easier comparison.Ex.LightSolvent / gSur-H2O inData:SC%,stabilizerfactant[g]D50 (PDI),pH[g][g]viscosity28L1 / 47.1n-ButylS1 / 14.2 68.8196 nm44,1%L2 / 20acetate / (0.33)7.0L3 / 2030.0375 mPas29L1 / 47.1EthylS2 / 6.8 75.1222 nm43.3%L2 / 20acetate / S3 / 1.1(0.37)7.0L3 / 2030.066 mPas30L1 / 47.1EthylS3 / 2.280.7219 nm42.3%L2 / 20acetate / (0.39)7.0L3 / 2030.0nd31L1 / 47.1EthylS5 / 2.980.1286 nm42.0%,L2 / 20acetate / (0.48)6.0L3 / 2030.0nd32L1 / 47.1EthylS6 / 5.977.1315 nm43.1%,L2 / 20acetate / (0.45)5.0L3 / 2030.0nd33L1 / 47.1EthylS7 / 11.071.9235 nm42.6%,L2 / 20acetate / (0.32)6.0L3 / 2030.0nd34L1 / 47,1EthylS8 / 14.768.3381 nm41.6%,L2 / 20acetate / (0.45)6.5L3 / 2030.0nd35L1 / 47.1EthylS2 / 10.4 72.6759 nm44.0%,L2 / 20acetate / (0.29)8.0L3 / 2030.0nd36L1 / 47.1EthylS9 / 8.874.1358 nm42.1%,L2 / 20acetate / (0.47)4.0L3 / 2030.0nd37L1 / 47.1MethoxyS1 / 14.9 68.8695 nm43.4%,L2 / 20propylaceta(0.95)7.0L3 / 20te / 30.0ndApplication ExamplesStarting materialsTable 1: Components of aqueous resin compositionResin component Acommercially available melamine-formaldehyde resin,Kauramin® BALANCE Impregnating Resin 799 (BASF SE)Hardenerblend of methylethanolammonium sulfite and sodium bisulfite(Hardener H529 (BASF SE))SolventwaterPreparation of aqueous resin formulations I-1 to 1-5For each example, the components listed in table 1 were intimately mixed in a polyethylenebeaker in the relative amount(s) given in table 2. Parts are given as parts by weight. Allweights are given telle quel.Table 2Example1-12) [g] 1-2 [g]1-3 [g]1-4 [g]1-5 [g]Resin component A8408408408401000Hardener1.751.750.001.753.00Water149.60149.60109.10109.1071.00Product of Example 170.0067.50 67.5067.500.00Lignostab® 5301)0.000.0045.0045.000.001) Tris(tetramethylhydroxypiperidinol) citrate in water.2) Comparative.Preparation of a resin impregnated decorative paper sheet: Examples P1 to P5A blue and a wood pattern decorative paper having a grammage of 80 g / m² wereimpregnated by dip impregnation with the aqueous resin formulation 1-5. Excess resin wasstripped off using spiralized squeegee bars.An overlay paper from the company Schöller without any corundum having a grammage of25 g / m² was impregnated by dip impregnation with the aqueous resin formulations I-1 to 1-4.Excess resin was stripped off using spiralized squeegee bars.The thus impregnated papers were dried in a convection oven for 90 - 120 seconds at 180°C to a moisture content as given in table 3.ExampleP-12)P-2P-3P-4P-5Resin composition1-11-21-31-41-5Moisture content [%]6.16.06.15.25.5Resin application [%]2512412482471332) Comparative.Application Examples1. Preparation of melamine coated HDF boards Application Examples 1a to 7dThe respective impregnate of Application Examples 1a to 7d was pressed onto a HDF boardusing a hot press between 20 and 40 seconds at 180 and 205°C. the applied pressure beingbetween 270 and 400 kN. Once the press has opened the coated HDF board was removedfrom the press and allowed to cool at ambient conditions.Table 4Application Examples1a2)1b1c1dOverlay resin composition1-11-21-31-4Decor paper:BlueBlueBlueBlueImpregnated with1-51-51-51-5Temperature [°C]180180180180Pressure [kN]400400400400Time [s]40404040Sample size [cm]20 x 4020 x 4020 x 4020 x 40Table 5Application Examples2a2)2b2c2dOverlay resin composition1-11-21-31-4Decor paper:WoodWoodWoodWoodImpregnated with1-51-51-51-5Temperature [°C]180180180180Pressure [kN]400400400400Time [s]40404040Sample size [cm]20 x 4020 x 4020 x 4020 x 40Table 6:Application Examples3a2)3b3c3dOverlay resin composition1-11-21-31-4Decor paper:BlueBlueBlueBlueImpregnated with1-51-51-51-5Temperature [°C]180180180180Pressure [kN]270270270270Time [s]40404040Sample size [cm]20 x 4020 x 4020 x 4020 x 40Table 7Application Example4Overlay resin composition1-2Decor paper:WoodImpregnated with1-5Temperature [°C]180Pressure [kN]270Time [s]40Sample size [cm]20 x 40Table 8Application Examples5a2)5b5c5dOverlay resin composition1-11-21-31-4Application Examples5a2)5b5c5dDecor paper:BlueBlueBlueBlueImpregnated with1-51-51-51-5Temperature [°C]205205205205Pressure [kN]270270270270Time [s]20202020Sample size [cm]20 x 4020 x 4020 x 4020 x 40Table 9Application Examples6a2)6b6c6dOverlay resin composition1-11-21-31-4Decor paper:WoodWoodWoodWoodImpregnated with1-51-51-51-5Temperature [°C]205205205205Pressure [kN]270270270270Time [s]20202020Sample size [cm]20 x 4020 x 4020 x 4020 x 40Table 10Application Examples7a2)7b7c7dOverlay resin composition1-11-21-31-4Decor paper:WoodWoodWoodWoodImpregnated with1-51-51-51-5Temperature [°C]205205205205Pressure [kN]270270270270Time [s]20202020Sample size [cm]40 x 4040 x 4040 x 4040 x 40The different samples of Application Examples 1a to 7d were placed in an acceleratedweathering device and their gloss @ 60 °and discoloration (AE*) were monitored over timeupon DIN EN ISO 16474-2 exposition.All samples Application Examples 1a to 7d were placed in an outdoor natural exposition inLimburgerhof (Germany) and their gloss @ 60 °and discoloration (AE*) were monitored overtime upon natural exposition.The test results are shown in Tables 11 to 21.Table 11: 60 °gloss and discoloration after 3.000 h DIN EN ISO 16474-2 exposition of thesamples of Application Examples 1a to 1d.Application Examples1a2)1b1c1d60°gloss at start:81676782Application Examples1a2)1b1c1d60°gloss after 1.000 h:10070658460°gloss after 2.000 h:6928628160°gloss after 3.000 h:39235175ΔΕ* after 1.000 h:7.61.31.91.2ΔΕ* after 2.000 h:15.95.83.62.9ΔΕ* after 3.000 h:20.311.37.25.8Table 12: 60 °gloss and discoloration after 3.000 h DIN EN ISO 16474-2 exposition of thesamples of Application Examples 2a to 2d.Application Examples2a2)2b2c2d60°gloss at start:7456668560°gloss after 1.000 h:7147648560°gloss after 2.000 h:2943617960°gloss after 3.000 h:24234974ΔΕ* after 1.000 h:1.20.61.20.8ΔΕ* after 2.000 h:4.92.92.21.8ΔΕ* after 3.000 h:7.26.74.23.3Table 13: 60 °gloss and discoloration after 3.000 h DIN EN ISO 16474-2 exposition of thesamples of Application Examples 3a to 3d.Application Examples3a2)3b3c3d60°gloss at start:7263678160°gloss after 1.000 h:7463658260°gloss after 2.000 h:6143637960°gloss after 3.000 h:43235768ΔΕ* after 1.000 h:7.42.91.61.4ΔΕ* after 2.000 h:15.413.72.83.6ΔΕ* after 3.000 h:21.618.95.57.2Table 14: 60 °gloss and discoloration after 3.000 h DIN EN ISO 16474-2 exposition of thesamples of Application Example 4.Application Example460°gloss at start:6860°gloss after 1.000 h:5660°gloss after 2.000 h:3660°gloss after 3.000 h:20ΔΕ* after 1.000 h:1.5ΔΕ* after 2.000 h:7.5ΔΕ* after 3.000 h:11.5Table 15: 60 °gloss and discoloration after 3.000 h DIN EN ISO 16474-2 exposition of thesamples Application Examples 5a to 5d.Application Examples5a2)5b5c5d60°gloss at start:6667738960°gloss after 1.000 h:6164728660°gloss after 2.000 h:4948698560°gloss after 3.000 h:49196677ΔΕ* after 1.000 h:5.23.82.02.0ΔΕ* after 2.000 h:15.213.93.44.3ΔΕ* after 3.000 h:26.017.35.99.2Table 16: 60 °gloss and discoloration after 3.000 h DIN EN ISO 16474-2 exposition of thesamples of Application Examples 6a to 6d.Application Examples6a2)6b6c6d60°gloss at start:5655627660°gloss after 1.000 h:5954486960°gloss after 2.000 h:4731497060°gloss after 3.000 h:41194062ΔΕ* after 1.000 h:2.50.81.21.2ΔΕ* after 2.000 h:6.35.51.91.9ΔΕ* after 3.000 h:8.99.33.33.4Table 17: 60 °gloss and discoloration after 12 months natural exposition of the samples ofApplication Examples 1a to 1d.Application Examples1a2)1b1c1d60°gloss at start:8075809560°gloss after 6 months:7862688760°gloss after 12 months:82637492ΔΕ* after 6 months:1.81.30.91.0ΔΕ* after 12 months:2.21.81.51.1Table 18: 60 °gloss and discoloration after 12 months natural exposition of the samples ofApplication Examples 2a to 2d.Application Examples2a2)2b2c2d60°gloss at start:8075788860°gloss after 6 months:7058668860°gloss after 12 months:79677290ΔΕ* after 6 months:2.11.02.80.4ΔΕ* after 12 months:0.80.61.21.0Table 19: 60 °gloss and discoloration after 12 months natural exposition of the sample ofApplication Example 4.Application Examples460°gloss at start:7160°gloss after 6 months:6060°gloss after 12 months:73ΔΕ* after 6 months:1.6ΔΕ* after 12 months:0.6Table 20: 60 °gloss and discoloration after 12 months natural exposition of the samplesApplication Examples 5a to 5d.Application Examples5a2)5b5c5d60°gloss at start:7774849360°gloss after 6 months:6969788760°gloss after 12 months:59658860ΔΕ* after 6 months:1.51.91.20.7ΔΕ* after 12 months:1.92.32.01.7Table 21: 60 °gloss and discoloration after 12 months natural exposition of the samples ofApplication Examples 6a to 6d.Application Examples6a2)6b6c6d60°gloss at start:7566688860°gloss after 6 months:6053547860°gloss after 12 months:62525462ΔΕ* after 6 months:1.11.21.31.1ΔΕ* after 12 months:0.91.10.61.0Table 22: 60 °gloss and discoloration after 12 months natural exposition of the samples ofApplication Examples 7a to 7d.Application Examples7a2)7b7c7d60°gloss at start:7671739060°gloss after 6 months:6759588260°gloss after 12 months:64605079ΔΕ* after 6 months:0.91.30.30.4ΔΕ* after 12 months:4.30.90.92.42) Comparative.Addition of product of example 17 (samples b, made with 1-2 resin composition) in an overlaydoes lead to a reduction of loss of gloss as well as a lower discoloration compared to thenon-UV stabilized overlay (samples a, made with I-1 resin composition).An even better weathering stability can be obtained by combining product of example 17 withLignostab® 530 (synergistic effect). Best gloss retention combined with lowest discolorationare then obtained with samples d (made with 1-4 resin composition).

Claims

1. A resin-impregnated fibrous material in the form of a sheet or a web, comprisingan impregnating resin, which is preferably an aqueous resin composition, and whichcomprisesa) at least one resin component, which is selected from the group consisting ofaminoplast resins and phenoplast resins and combinations thereof; andb) a concentrated aqueous polymer dispersion with an average particle size of lessthan 1000 nm (i.e. droplets of ethylenically unsaturated monomer and components b1)and b2) with an average particle size of less than 1000 nm), comprisinga polymer carrier prepared by heterophase radical polymerization of at least oneethylenically unsaturated monomer in the presence of components b1), b2) and b3); oran emulsion, comprising components b1), b2) and b3, an organic solvent and water;b1) at least one light stabilizer of formula(I), whereinAr¹ is a group of the formula(D-2),R® is hydrogen, C1-C24alkyl, C5-C12cycloalkyl, C7-C12phenylalkyl, or halogen;R5 and R are independently of each other hydrogen, or C1-C20alkyl, especiallyhydrogen;Z is hydrogen, C2-C20alkenyl, or said C2-C20alkenyl, substituted by one to three -R44,-OR45, -COOR45, —OCOR45 and / or interrupted by one to three —О—, —СОО—, —OCO- or -CO-; C1-C24alkyl or C5-C12cycloalkyl; or said C1-C24alkyl or said C5-C12cycloalkyl substituted by one to three -R44, —OR45, —COOR45, —OCOR45 and / orinterrupted by one to three —О—, —СОО—, —ОСО— or -CO-;R44 is C6-C12aryl, C6-C12aryl substituted by one to three halogen, C1-C8alkyl, C1-Csalkoxy, or combinations thereof; C5-C12cycloalkyl; C7-C12phenylalkyl, C7-C12phenylalkyl substituted on the phenyl ring by one to three halogen, C1-C8alkyl, C1-Caalkoxy, or combinations thereof;R45 is defined as is R44; or is hydrogen, or C1-C24alkyl;Ar2 and Ar³ in formula (I) are independently of each other selected from a group of theformula (D-2),(D-3), phenyl or phenyl substituted by one to threeC1-C6alkyl, halogen, hydroxy or C1-C12alkoxy; naphthyl or naphthyl substituted by oneto three C1-C6alkyl, halogen, hydroxy or C1-C12alkoxy; and(D-4);R51, R52, R53, R54 and R55 are independently of each other hydrogen, hydroxy, cyano,C1-C20alkyl, C1-C20alkoxy, C7-C12phenylalkyl, C5-C12cycloalkyl, C5-C12cycloalkyloxy, orhalogen;Z' is as defined for Z; R6 is as defined for R6, R5 and R are as defined for R5 and R8,respectively;b2) at least one hindered amine-based light stabilizer preferably selected from hinderedamine light stabilizers of formula(lla),wherein A is -CH(R3)CH2- or CH2CH(R3)-; each R¹ is C1-C21alkyl ; acyclic C1-C21alkenyl having 1, 2, or 3 double bonds; or C3-C7cycloalkyl ; R2 is H or C1-C3alkyl;and R³ is H or C1-C4alkyl; hindered amine light stabilizers of formula(Ilb), whereinY¹ is -(CH2)y, or a group of formula,R is H, CH3, OC8H17, or OC6H11;y is an integer of 6 to 10,B¹ and B2 are independently of each other C1-C12alkyl, especially C3-C6alkyl,B³ is H, and B4 is -(CH2)b-OH, b is an integer of 1 to 4, especially(llb1), wherein R is H, CH3 or OC8H17;hindered amine light stabilizers of formula(IIc), whereinA¹ is a direct bond or C1-C10alkylene;A2 is -CH(R3)CH2- or CH2CH(R3)-;R2' is H or C1-C3alkyl; and R³' is H or C1-C4alkyl;n is a number of from 2 to 50; and mixtures thereof; andb3) a non-ionic, cationic or anionic surfactant; andc) optionally an Excited State Quencher (ESQ), which is preferably selected fromhindered nitroxyl compounds, hindered hydroxylamine compounds and hinderedhydroxylamine salt compounds, or mixtures thereof.2.The resin-impregnated fibrous material in the form of a sheet or a web according toclaim 1, whereinAr¹ in formula (I) is a group of the formula(D-2), whereinR44(CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14;n1 is 0 or 1;R12 is C1-C18alkyl or C6-C12aryl or CO-C1-C18alkyl;R13 is H or C1-C8alkyl; R14 is C2-C12alkenyl, especially C1-C12alkyl or C5-C6cycloalkyl;andR6, R5 and R are hydrogen.3.The resin-impregnated fibrous material in the form of a sheet or a web according toclaim 1, or 2, whereinAr2 and Ar³ in formula (I) are independently of each other a group of the formula(D-2), whereinZ is (CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14;n1 is 0 or 1;R12 is C1-C18alkyl or C6-C12aryl or CO-C1-C18alkyl;R13 is H or C1-C8alkyl; R14 is C2-C12alkenyl, especially C1-C12alkyl or C5-C6cycloalkyl;andR6, R5 and R are hydrogen; orAr2 and Ar³ in formula (I) are independently of each other a group of the formula(D-3), wherein Z' is (CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14;n1 is 0 or 1;R12 is C1-C18alkyl or C6-C12aryl or CO-C1-C18alkyl;R13 is H or C1-C8alkyl; R14 is C2-C12alkenyl, especially C1-C12alkyl or C5-C6cycloalkyl;andR6, R5 and R8' are hydrogen; orAr2 and Ar³ in formula (I) are independently of each other phenyl or phenyl substitutedby one to three C1-C6alkyl; orAr2 and Ar³ in formula (1) are independently of each other a group of the formula; whereinR51, R52, R53, R54 and R55 are hydrogen.4.The resin-impregnated fibrous material in the form of a sheet or a web according to anyof claims 1 to 3, wherein the light stabilizer of formula (I) is selected from 2-(4.6-diphenyl-1.3.5-triazin-2-yl)-5-(hexyloxy)-phenol, 2-(4.6-bis-(2.4-dimethylphenyl)-1.3.5-triazin-2-yl)-5-(octyloxy)-phenol, 2-[4.6-Bis(2.4-dimethylphenyl)-1.3.5-triazin-2-yl]-5-[3-(dodecyloxy)-2-hydroxypropoxy]phenol and 2-[4.6-bis(2.4-dimethylphenyl)-1.3.5-triazin-2-yl]-5-[2-hydroxy-3-(tridecyloxy)propoxy]phenol, 2-[4.6-bis(2.4-dimethylphenyl)-1.3.5-triazin-2-yl]-5-[3-[(2-ethylhexyl)oxy]-2-hydroxypropoxy]phenol, 2-[4.6-Bis([1.1'-biphenyl]-4-yl)-1.3.5-triazin-2-yl]-5-[(2-ethylhexyl)oxy]phenol, 2-[2-hydroxy-4-(1-octyloxycarbonylethyl)oxyphenyl]-4.6-di(4-phenyl)phenyl-1.3.5-triazine, 2.4.6-tri(2.4-dihydroxyphenyl)-1.3.5-triazine, 2.4-bis[2-hydroxy-4-butoxyphenyl]-6-(2.4-dibutoxyphenyl)-1.3.5-triazine, 2.2'-[6-(4-methoxyphenyl)-1.3.5-triazine-2.4-diyl]bis(5-((2-ethylhexyl)oxy)-phenol, 2.4.6-tris-(2'-hydroxy-4'-butoxyphenyl)-1.3.5-triazine,2.2'.2"-(1.3.5-triazine-2.4.6-triyl)tris[5-(octyloxy)phenol], 2.4.6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1.3.5-triazine, 2-[4.6-bis(2.4-dimethylphenyl)-1.3.5-triazin-2-yl]-5-[2-hydroxy-3-(tridecyloxy)propoxy]-phenol, 2.4.6-tris[4-(1-octyloxycarbonyl)ethyloxy-2-hydroxyphenyl]-1.3.5-triazine, 1.1'-dioctyl 2.2'-[[4-[4.6-bis[2-hydroxy-4-[1-methyl-2-(octyloxy)-2-oxoethoxy]phenyl]-1.3.5-triazin-2-yl]-1.3-phenylene]bis(oxy)]bis[propanoate], 2.4-bis(2.4-dihydroxyphenyl)-6-(4-methoxyphenyl)-1.3.5-triazine, 2-(2.4-dihydroxyphenyl)-4.6-diphenyl-1.3.5-triazine, 2.6-bis(2.4-dimethylphenyl)-4-(2.4-dihydroxyphenyl)-s-triazine, 4-[4.6-bis([1.1'-biphenyl]-4-yl)-1.3.5-triazin-2-yl]-1.3-benzenediol and 2.4.6-tris(2.4-dihydroxy-3-methylphenyl)-1.3.5-triazineand 2.4.6-tribiphenyl-4-yl-1.3.5-triazine.5.The resin-impregnated fibrous material in the form of a sheet or a web according to anyof claims 1 to 4, wherein the at least one light stabilizer is selected from(B-1)(B-2)(B-3)(B-4)(B-5)(B-6)(B-7)(B-8)(B-9)(B-10)(B-11)(B-12),(B-13),(B-14),(B-15),(B-16),(B-17),(B-18),(B-19), and mixtures thereof.6.The resin-impregnated fibrous material in the form of a sheet or a web according to anyof claims 1 to 5, wherein the Excited State Quencher (ESQ) is a compound of formula(tris(tetramethylhydroxypiperidinol) citrate).7.The resin-impregnated fibrous material in the form of a sheet or a web according to anyof claims 1 to 6, wherein the surfactant b3) in case of polymer carriers prepared byheterophase radical polymerization of at least one ethylenically unsaturated monomerin the presence of components b1), b2) and b3) is an anionic surfactant which ispreferably selected from alkali and ammonium salts of sulphonic acid (e.g. C12-C18alkylsulfonic acid), mono- or dialkylsulfosuccinates, or sulfuric acid halfesters ofethoxylated alkanoles, especially poly(oxy-1.2-ethanediyl), a-sulfo-o-hydroxy-, C12-14-alkyl ethers, sodium salts; and in case of emulsions comprising components b1), b2)and b3) is an cationic surfactant which is preferably selected from C1-C2-alkyl sulfate,tosylate or halogenide salts of quaternary tetra alkyl ammonium compounds, or C1-C2-alkyl sulfate or halogenide salts of quaternary tetra alkyl ammonium compounds, whereone, two or three alkyl groups are alkoxylated substituents.8.The resin-impregnated fibrous material in the form of a sheet or a web according to anyof claims 1 to 7, wherein the ethylenically unsaturated monomer is selected from thegroup consisting of C1-C20alkyl acrylates, C1-C20alkyl methacrylates, acrylic acid,methacrylic acid, styrene, vinyltoluene, hydroxy-functional acrylates or methacrylates,acrylates or methacrylates derived from alkoxylated alcohols and multifunctionalacrylates or methacrylates or mixtures thereof.9.The resin-impregnated fibrous material in the form of a sheet or a web according toclaim 8, wherein the ethylenically unsaturated monomer is a mixture of methylmethacrylate, stearyl-methacrylate, butanediol diacrylate and methacrylic acid; or amixture of methyl methacrylate, isobutyl methacrylate, vinyl toluene, cyclohexylmethacrylate, 2-hydroxyethyl methacrylate, stearyl methacrylate and butanedioldiacrylate.

10. A process for producing a resin-impregnated fibrous material as claimed in any one ofthe preceding claims, which comprises impregnating a sheet or a web of a fibrousmaterial with a liquid resin formulation comprising the impregnating resin defined in anyof claims 1 to 9.

11. The process according to claim 10, wherein the impregnation comprisesi) a first step, where the sheet or the web of the fibrous material is impregnated withliquid resin formulation.

12. Use of the resin-impregnated fibrous sheet material as defined in any one of claims 1to 9 for providing a plastic surface to a panel.

13. A process for providing a panel with a plastic surface, which comprises providing asheet or a web of a resin-impregnated fibrous material as defined in any one of claims1 to 9 on at least one surface of the panel.

14. A panel having a plastic surface, which is obtainable by a process of claim 13.

15. A concentrated aqueous polymer dispersion with an average particle size of less than1000 nm (i.e. droplets of ethylenically unsaturated monomer and components b1) andb2) with an average particle size of less than 1000 nm), comprisinga) a polymer carrier prepared by heterophase radical polymerization of at least oneethylenically unsaturated monomer in the presence ofb1) at least one light stabilizer of formula (I);b2) at least hindered amine-based light stabilizer; andc) cationic or anionic surfactant preferably by heterophase radical polymerization,wherein the at least one hindered amine-based light stabilizer is a hindered amine lightstabilizer of formula(llb), whereinY1 is -(CH2)y, whereinR is H, CH3, OC8H17, or OC6H11;(llb1),y is an integer of 6 to 10, especiallywherein R is H, CH3 or OC8H17; sndthe at least one light stabilizer of formula (I) is mixture of a compound of formula(Ib), whereinR5', R5", R7' and R7" are hydrogen, or C1-C6alkyl, especially C1-C3alkyl, and a compound(Ic), especially(Ic'), whereinR51, R52, R53, R54 and R55 are as defined in claim 1 and are preferably hydrogen.Z is (CH2-CH2-O-)n1-R12; -CH2-CH(OH)-CH2-O-R12; or -CH(R13)-CO-O-R14;n1 is 0 or 1;R12 is C1-C18alkyl or C6-C12aryl or CO-C1-C18alkyl;R13 is H or C1-C8alkyl; R14 is C1-C12alkyl or C2-C12alkenyl or C5-C6cycloalkyl, andthe ethylenically unsaturated monomer is selected from the group consisting of C1-C20alkyl acrylates, C1-C20alkyl methacrylates, acrylic acid, methacrylic acid, styrene,vinyltoluene, hydroxy-functional acrylates or methacrylates, acrylates or methacrylatesderived from alkoxylated alcohols and multifunctional acrylates or methacrylates ormixtures thereof.

16. An aqueous coating composition, comprising the concentrated aqueous polymerdispersion according to claim 15 and c) optionally an Excited State Quencher (ESQ),especially a compound of formula(tris(tetramethylhydroxypiperidinol) citrate).

17. Use of the aqueous coating composition according to claim 16 for the production ofclear-coats, in particular for concrete floorings, for plastics, for cladding and asovercoat for metallic coatings.

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