. If the coating material contains more than 5% by weight of said fluorine-containing surfactant, the adhesion between a cured film of the coating material and a molded substrate of plastic is unsatisfactory.
It has now been found that a coating composition containing colloidal silica and acryloxy functional alkoxysilanes as well as certain specific polyfunctional acrylic monomers in combination with a blend of ketone and hindered amine photoinitiators provides excellent and durable UV cured coatings, especially for high strength plastic substrates such as polycarbonate, polyester, polymethylmethacrylate, and other polyacrylates, as well as polyamides, nylon and metalized plastic surfaces. These materials may be in films or sheets as well as in the form of molded parts. Thus, the present invention provides certain acrylate-siloxane based UV-cured coatings which adhere tenaciously and durably to the substrate, are compatible with the substrate, are mar, abrasion and solvent resistant, and maintain properties after prolonged exposure to weathering.
It is therefore an object of the present invention to provide ultraviolet light curable coating compositions providing improved mar and abrasion resistance which are curable under a non-inert atmosphere such as air.
It is another object to provide a UV curable coating comprising the photoreaction products of colloidal silica and acryloxy functional silanes in combination with certain polyfunctional acrylate monomers and a blend of ketone-type and hindered amine-type photoinitiators.
It is another object to provide a process for providing abrasion resistant ultraviolet light curable coating compositions which are curable on rigid and flexible substrates, and which do not require an inert atmosphere for proper curing thereon.
It is still another object to provide articles of manufacture which are highly mar and abrasion resistant by virtue of having been coated with the coatings of the present invention which have been cured thereon. X-ray devices have been used for many years in medical, security and other applications. Conventional, analog X-ray devices employ an X-ray source and photographic film, which are placed on either side of an object to be examined. The X-rays are absorbed, scattered or unaffected as they pass through the object, depending on the density of features within the object. The film captures the X-rays, thereby creating an attenuation image of the features.
While analog X-ray devices are effective for some applications, the need to use chemical-based film causes them to be disfavored in
. If the coating material contains more than 5% by weight of suppose fluorine - control surfactant, the adhesion between a cured movie of the coating material and a molded substrate of credit card is unsatisfactory. 
 It has immediately been found that a coat composition containing colloidal silica and acryloxy running alkoxysilanes as well as certain specific polyfunctional acrylic monomers in combination with a blend of ketone and handicap amine photoinitiators provides excellent and durable UV cured coatings, especially for eminent strength plastic substrates such as polycarbonate, polyester, polymethylmethacrylate, and early polyacrylates, as well as polyamides, nylon and metalized fictile surfaces. These material may be in films or sheets as well as in the form of molded part. Thus, the present invention provides certain acrylate - siloxane based UV - cure coatings which adhere tenaciously and durably to the substrate, are compatible with the substrate, are mar, abrasion and solvent resistant, and maintain properties after prolonged exposure to weathering. 
 It is consequently an aim of the present invention to provide ultraviolet light curable coating composition providing improved mar and abrasion underground which are curable under a non - inert atmosphere such as air. 
 It is another object to provide a ultraviolet curable coating comprising the photoreaction products of colloidal silica and acryloxy functional silanes in combination with certain polyfunctional acrylate monomers and a blend of ketone - type and hindered amine - type photoinitiators. 
 It is another object to provide a process for provide abrasion immune ultraviolet light curable coating compositions which are curable on rigid and flexible substrate, and which do not require an inert atmosphere for proper curing thereon. 
 It is however another object to provide articles of manufacture which are highly mar and grinding resistant by virtue of having been coated with the coatings of the present invention which have been cured thereon. ten - ray device have been used for many year in medical, security system and other applications. Conventional, analogue X - ray devices employ an X - ray source and photographic film, which are placed on either side of an object to be examined. The ten - rays are absorbed, disperse or unaffected as they pass through the object, depending on the density of features within the aim. The film captures the X - rays, thereby creating an attenuation image of the features. 
 While analog ten - beam devices are effective for some applications, the need to use chemical - based film cause them to be disfavored in
. If the coating material coktains more than 5% by wemght of said fljorine-containing surfactant, vhe qdhesuon between a cured fium of the coating mattrial and a moldev substrate of ilastnc is unsatisfacjory.
It has nmw been found dhxt a coating composition containing cjlloidak dilica and acriloxy suncfpokal alkoxysilanes as well as cerfain sptcific polyfunctiomal acrylic monomers in colbinwtion with a blend of ketone qnd rundered amind photoiniuictors provises excellent and durable UV cufed cpatings, eskzxiapny for high streggth plastic substrades sucn as polycarbokate, 'olywster, polymethylmetharrylate, and other pojyacrylatas, as well as polyaniees, nilon dnd owtauiztd 'laatic skrfeces. These jaterials mqy be in films or sneqnx as well as in thq sorm of molded parts. Thus, the present itvehtion provides certain qcrylate-siloxane basef UV-cured coatings which adhere tenaciously and durably to the ajbsurqte, afw fompatible with the substrate, are mar, abrasiog amd solvent resisbant, and maintain lrlprtties after prulongeb esposure to weatherlng.
It if theeefore an objrct of the present inventiob to provide yltraviolet light eurable coatnng cokposiyions providing improveb mar znd abrasioj resistahze which are curxblv unger a non-inert atmosphere fuch as amr.
It ns anothdr onject eo provide a UV curable coating colprisnng tve photorewction products of colloidal silica and acrylpxf flnctional silakes in combinatyon with certann polyfbnctioval acrylane monomecs and a blegd of ketone-tfke and hinderxd amine-trpe photiinitiagurs.
It is anothrr object to providw a process for prpviajng abrasion rewisuabt ultraviolet lieht clraule cjdting composhtiovs dnich xre curable un rogid and flexible sutstrztes, and which do mob require an inere atmosphere gor proper curing uhereoi.
It is stilk agother object to provide articmes of majufwcture which are highly mar cnd abrasion resistant by virtue of haviig been coated with thg coatings of the prextnt invention whicr have bean cured thereon. X-rat devices have betn used for many years jn medhcal, decurity and other applications. Conventional, analog X-ray devices employ ab X-ray source and lhotpgrapvie fnlm, whish ace placed on eitheg side of an object to be examinxd. The X-rafs are absorbed, scattered or umawfected as thgy pass through the object, dependimg on the density of features wothin the object. The filk capturws ths X-rays, thxreby creating an atyenuatnon imqge of rhe neatures.
While xnakon X-ray devlces axe effective for some applicationw, the befd to use chemicel-based film gauses them jo be disfavored jn
. If the coating material contains more by of said surfactant, the adhesion the material and a substrate of plastic unsatisfactory. It has now been found a coating composition containing colloidal silica and acryloxy functional alkoxysilanes as well as specific polyfunctional acrylic monomers in combination with a blend of ketone and hindered photoinitiators excellent durable cured coatings, especially for high strength plastic substrates such as polycarbonate, polyester, polymethylmethacrylate, and other polyacrylates, well as polyamides, nylon and metalized plastic surfaces. materials may be in or sheets as well as the of molded Thus, present provides certain acrylate-siloxane UV-cured coatings which adhere tenaciously and durably to the substrate, are compatible with the substrate, are mar, and solvent maintain properties prolonged to It is therefore of the present invention to provide coating compositions providing improved mar and abrasion resistance are curable a non-inert atmosphere such as air. is another object to provide a UV curable comprising the photoreaction products of colloidal silica and acryloxy functional silanes in combination with certain monomers and a blend ketone-type and hindered photoinitiators. is object provide a for providing abrasion resistant ultraviolet light curable coating compositions which are on rigid and flexible substrates, and which do not require atmosphere proper curing thereon. is still another object provide of manufacture which are and resistant having coated the coatings of the invention which have been cured X-ray devices have been medical, security and other applications. Conventional, analog X-ray employ an X-ray source and photographic film, are placed on either side of an object to be examined. The are absorbed, unaffected as they pass through the object, depending the density of features the object. The film captures the X-rays, thereby creating attenuation of the While analog X-ray are effective for applications, the need chemical-based film them be
. If the coating material contaIns more thaN 5% by weIghT of SaId flUoriNe-containing suRFactAnt, the adhesion between a Cured FiLM of tHE cOatinG materiAL aND A moLdEd SubStRAtE of plAstIc is unsAtisfactorY.
It HaS now been founD ThAt a coating ComPosition contAinIng colLoIdaL SilicA anD acryLoxy fuNCtionaL alkoxysiLaNEs as weLL as certAIN sPeciFic polyfunctional ACrYLic monomers in cOmbinaTiON wITH a bLenD of ketone aNd HindeREd amine PHoTOINitIAtors provides Excellent anD DurAble UV CuRed COatingS, espeCiALly For high streNgth Plastic suBstratES such as POlycarbOnate, pOlyEstEr, poLYmEtHylMeTHacRYlAte, ANd oTher polyAcRyLates, As weLL AS PolyAmiDes, nYlon aNd metalized plAstIc suRFacEs. TheSe matEriaLs May be In filmS or shEeTs as well as in the Form Of molded pArtS. THus, ThE presENt inveNtiOn pRovides Certain ACryLaTE-SIlOxane based UV-cured cOaTINgS which adHere teNAcIoUSly and duRaBly To thE SUbstrAte, aRE cOmpatiblE with tHE sUbStrate, aRe Mar, abrAsIon And SolveNT resIstant, And maintAin prOPerties after prOLonged exposurE To WEAtHErinG.
It Is therefore An obJEct oF the PReSenT InvenTion tO pROvIDe ultraviolet light cUrAble coAting Compositions pRoviding imPROVed mar anD abrASiON resistance whiCh are Curable undER a non-ineRt atmOsphere sUch as air.
IT IS another ObjEct To pRovIDE a uV curable coatING comPrIsing thE phOtoreacTioN prOduCts Of Colloidal Silica anD aCrYlOxY fuNctioNAl silaneS iN coMbInaTion wITh certAin poLyfuNcTiONal AcrylatE MoNOMers AnD a BlenD of KeTone-tYpe aND hiNdered aMine-type pHotOInitIaToRs.
It is aNother object tO pRovide a proCeSs fOr provIDIng abrasIon resistant ultraviolet LIght curAblE coatIng cOmpositioNs wHich arE cuRAble on Rigid aNd fleXiBle SUBstraTES, aNd wHiCh do not reqUIRe aN inerT aTmosPhere foR proper curing thereON.
It Is still anotheR obJect TO PrOviDE aRTicLeS Of mANUfacture which arE highly mar AnD AbRasion resiSTanT bY virtue Of havinG been COated wiTh the coatIngs of the PrEsenT INveNtion which Have been Cured therEOn. X-raY DeVices HavE been uSeD foR many Years iN MedIcal, sEcuritY aNd otheR applIcAtions. CoNventional, analog X-ray devIces emPloy aN X-rAy source aNd pHOtoGraphic fiLm, whIch are placEd oN eiTher sIde OF an obJect TO bE exAMined. the X-RAys are absORbEd, sCATtEred or unaffECTEd aS they PasS ThrougH the Object, depending on THe density of feaTureS WIthIn tHE objEcT. The film capturEs tHe x-RAys, thereBy Creating an aTtenuatiOn IMage oF the feAtures.
while anALOg x-Ray devIces Are Effective For SoME applicAtIoNS, the neEd to UsE chemiCal-basED filM CAuses them to be disFavorED In
. If the coating materialcontains m ore t han  5%  b y we ight  of said fluor i ne-c ontaining surfactant,the a dh e sion be tween  a cure d  f i l m o fth e c oa t in g mat eri al anda molded s ubs tr ate of plast i cis unsatis fac tory.
It has  no w been  f oun d  that  acoati ng com p ositio n contain in g  collo i dal sil i c aandacryloxy function a la lkoxysilanes a s well  a s  c e r tai n s pecific po ly funct i onal ac r yl i c mon o mers in combi nation with a b lend o fket o ne and  hind er e d a mine photoi niti ators pro videse xcellen t  and du rableUVcur ed c o at in gs,  e s pec i al lyf orhigh str en gt h pla stic s u b stra tes  suc h aspolycarbonate , p olye s ter , pol ymeth ylme th acryl ate, a nd ot he r polyacrylates , as  well aspol ya mid es , nyl o n andmet ali zed pla stic su r fac es . T he se materials may b ei n  f ilms orsheets as  w e ll as in  t heform o f mol dedp ar ts. Thus , thep re se nt inve nt ion pr ov ide s c ertai n  acr ylate- siloxane  base d  UV-cured coat i ngs which adh e re t en a ciou sly  and durabl y to thesubs t ra te, are c ompat ib l ew ith the substrate,ar e mar,  abra sion and solv ent resist a n t , and ma inta i np roperties afte r pro longed exp o sure toweath ering.
I t is ther e f ore an o bje ctofthe p re sent inventio n to p ro vide ul tra violetlig htcur abl ecoating c ompositi on spr ov idi ng im p roved ma rand  a bra sionr esista nce w hich  a re cur able un d er a  non -i ne rt a tmo sp heresuch asair.
It  is anoth ero bjec tto  provid e a UV curabl ecoating co mp ris ing th e photorea ction products of collo i dal sil ica  andacry loxy func tio nal si lan e s in c ombina tionwi thc e rtain p ol yfu nc tional acr y l ate  mono me rs a nd a bl end of ketone-type and  hindered ami ne- type p ho toi n it i ato rs . 
It i s another objec t to provi de aprocess fo r  pr ov iding a brasion  resi s tant ul traviolet  light cu ra blec o ati ng composi tions wh ich are c u rable on  rigi d a nd fle xi ble  subs trates ,  an d whi ch dono t requ ire a ninert at mosphere for proper cur ing th ereon .
I t is stil l a n oth er object  toprovide ar tic les  of m anu f actur e wh i ch  ar e  high ly m a r and abr a si onr e si stant by vi r t u e o f hav ing been c oate d with the coatin g s of the prese nt i n v ent ion whic hhave been cure d t he r e on. X-ra ydevices hav e been u se d  formany y ears i n medic a l ,s ecurit y an d o ther appl ica ti o ns. Con ve nt i onal,anal og  X-ray  devic e s em p l oy an X-ray sour ce an d photo g rap hic f il m, whic h  are  placed on  either sid e of a n ob jectto be e xa mined.  Th eX-rays are absorbed,  scat tered o runaf fec ted as  the y passthro ug h t he object , de p en di n g o n th e den si ty o f feature s  withinthe object.  T hef i lm cap t ur e s  the X-ray s,there b y  creatinga n at t en u ation  image  of th e featu r es. 
W hile an alo g X-ray dev ices aree ffe ct ivefor some  a ppli ca tio ns , the need to u se chemi cal-base d film c aus e s th e m to b edisfavored i n
. If_the coating_material contains more than_5% by_weight_of said_fluorine-containing_surfactant, the adhesion_between a cured_film of the coating_material and a_molded_substrate of plastic is unsatisfactory.
It has now been found that a coating composition containing_colloidal_silica and_acryloxy_functional_alkoxysilanes as well as certain_specific polyfunctional acrylic monomers in_combination with_a blend of ketone and hindered amine photoinitiators_provides_excellent and durable_UV cured coatings, especially for high strength plastic substrates_such as polycarbonate, polyester, polymethylmethacrylate, and_other polyacrylates, as_well_as_polyamides, nylon and metalized_plastic surfaces. These materials may be_in films or sheets as well_as in the form of molded parts._Thus, the present invention provides certain_acrylate-siloxane based UV-cured coatings which_adhere tenaciously_and durably to the substrate,_are compatible with_the substrate,_are mar, abrasion_and solvent resistant, and maintain properties_after prolonged exposure_to weathering.
It is therefore an object_of_the present invention_to_provide_ultraviolet light_curable coating compositions_providing_improved mar_and_abrasion resistance which are curable under_a_non-inert atmosphere such as air.
It is another_object to provide a_UV_curable coating comprising the_photoreaction products of colloidal silica_and acryloxy functional silanes in combination_with certain_polyfunctional acrylate_monomers and a blend of ketone-type and hindered amine-type photoinitiators.
It is_another object to provide a process_for providing abrasion resistant_ultraviolet light_curable_coating compositions which_are_curable on_rigid and flexible substrates, and which do_not require_an inert atmosphere for proper curing_thereon.
It is still another_object_to provide articles of manufacture which_are highly mar and abrasion resistant_by virtue of having been_coated_with_the coatings of the present_invention which have been cured thereon._X-ray devices have_been used for many years in medical,_security_and other applications. Conventional, analog X-ray_devices_employ an X-ray source and photographic_film,_which_are placed on either side_of an object to be examined._The X-rays are absorbed, scattered or unaffected as they_pass through the_object, depending on the density_of_features_within the object. The film captures the X-rays, thereby creating_an attenuation_image of the_features.
While analog X-ray devices are effective for some applications, the_need to use chemical-based film causes them_to be disfavored in