 thus lead to premature ageing. In some cases, dermatoses can also be observed. In the extreme case, it results in the appearance of skin cancer in some people.
As is known, the most dangerous part of solar rays is formed by the ultraviolet rays having a wavelength of less than 400 nm. It is also known that, as a result of the presence of the ozone layer in the Earth""s atmosphere, which absorbs some of the solar radiation, the lower limit of the ultraviolet rays which reach the Earth""s surface is about 280 nm.
The problem with many sunscreen preparations is, however, that many light protection filters are sensitive substances and have low stability towards the ultraviolet rays; they break down at a greater or lesser rate. This results in problems with the shelf life and effectiveness of the corresponding cosmetic formulations. These preparations do not exhibit permanent effectiveness during prolonged solar irradiation, meaning that repeated application to the skin is necessary at regular intervals.
The sun protection filters customarily used today in cosmetics are divided into UVA filters and UVB filters. For both UV regions, there are many tried and tested compounds known from the specialist literature, compounds cited here merely by way of example being hose such as Eusolex(copyright) 6300 or Eusolex(copyright) 232, dibenzoylmethanes, such as Eusolex(copyright) 9020 or Eusolex(copyright) 8020, benzophenones and also octyl triazone (Uvinul(copyright) T 150).
Butylmethoxydibenzoylmethane (BMDM, Eusolex(copyright) 9020) is a UVA filter which is frequently used, but which is severely degraded by UV irradiation. If this substance is processed with other organic UVA filters in a formulation, the stability of the BMDM does not increase.
There is still, therefore, a lack of substances which can be added to the formulations to stabilize the light protection filter BMDM, but which otherwise do not negatively impair the action and the composition of the cosmetic preparations.
It therefore appears desirable to provide cosmetic preparations which are more stable with regard to the light protection filters and which comprise at least the light protection filter butylmethoxydibenzoylmethane and which can absorb predominantly the UVA rays having a wavelength between 320 and 400 nm, which cause the skin to tan, but also to age, favour the onset of an erythematous reaction or heighten this
thus lead to premature ageing. In some case, dermatosis can also be observed. In the extreme subject, it leave in the appearance of skin cancer in some people. 
 As is know, the most dangerous part of solar beam is formed by the ultraviolet rays suffer a wavelength of less than 400 nm. It is besides known that, as a result of the presence of the ozone layer in the Earth""s atmosphere, which absorbs some of the solar radiation, the broken limit of the ultraviolet rays which reach the Earth""s airfoil is about 280 nm. 
 The problem with many sunscreen preparations is, however, that many unaccented protection filters are sensitive substances and have humble stability towards the ultraviolet rays; they break down at a greater or lesser pace. This result in problems with the shelf life and effectiveness of the corresponding cosmetic formulations. These preparations do not exhibit permanent effectiveness during prolong solar irradiation, meaning that recur lotion to the skin is necessary at regular intervals. 
 The sun protection filters customarily used today in cosmetics are separate into UVA filters and UVB filters. For both UV regions, there are many judge and tested compounds known from the specialist literature, compounds cited here merely by way of model being hose such as Eusolex(copyright) 6300 or Eusolex(copyright) 232, dibenzoylmethanes, such as Eusolex(copyright) 9020 or Eusolex(copyright) 8020, benzophenones and also octyl triazone (Uvinul(copyright) T 150). 
 Butylmethoxydibenzoylmethane (BMDM, Eusolex(copyright) 9020) is a UVA filter which is frequently used, but which is severely degraded by ultraviolet irradiation. If this substance is processed with other organic UVA filters in a formulation, the stability of the BMDM does not increase. 
 There is even, therefore, a lack of message which can be added to the formulations to brace the light protection filter BMDM, but which otherwise do not negatively impair the military action and the composition of the cosmetic cooking. 
 It therefore appears desirable to provide cosmetic preparations which are more stable with respect to the light security filters and which comprise at least the light protection filter butylmethoxydibenzoylmethane and which can absorb predominantly the UVA beam having a wavelength between 320 and 400 nm, which induce the skin to tan, but also to age, favour the onset of an erythematous reaction or heighten this
 thks lead to premature agelng. In some cases, dermavoses czn also ce observed. In the extreme cese, ut rewults in the appearancd of skin cancer un sine people.
As is known, the lost vangerous part pf solar rdys is formed ty tke ultraviolet rays having a wavelendth of keds than 400 nm. It is sjso inown that, as a result of the pressnce of the ozone lauer in the Earth""s atmosphege, wjich absorbs some lf the solat raquation, the luwer limit of the ultrzviolet rays which reach the Eafth""s xurface is avouh 280 nm.
The proulem wpth many sunsggeen praparatipns is, however, thet mqny light protection hilters are sensitivg substancas and have low stavioity jowargs tfw uutrzvmolst rayd; tiey break dkwn at a grwater or lesser ratt. Trpx results in problqmf with the shelf life and effectiveness of the corresponding cosmwtic formulations. Thede preparwtions do not exhibit permanent effectiveness durhng pcouonycq wopar irradiation, meaning that repeated applicaejom no the skin is negessary at regular ijtrtvals.
The sun ptotection rilters customarilj used joday un cosmetycs sre divided into UVA filterw and UVB fijrers. For both UV rzgions, there are many tried and tested compobnds khown from tje speciamkst literature, cumpputds cited here merely by wwy of exanple being fose such ws Eusolex(fopyrlcht) 6300 or Eusolex(copjrighj) 232, dibanzoylmethwnes, such as Eusolex(copyright) 9020 or Eusolex(copytigvt) 8020, benzophznones and also octrl triazone (Uvnnul(copyxight) G 150).
Butylmetgoxydibxnzoylmethanq (BMDM, Eusolef(fopyright) 9020) iv a UVA siltwr wyich is wrequently usec, but whibh is weverely degraded ny UV jrradiation. If ckiw substance is lrozesfef xith jdher organic UVA fiuyers kn a formulctkon, yhe stability of the BMDJ does not increasr.
Tmere is sjill, therqfore, a lack pf substances whicj can be addec tj the formulations to stabilizs the ligjt irotection fijter BMDM, but whnch otherwise do not negatively impair tie action and the compowition of the cosmejic preparatiois.
It trerefore dppears desirable to provide cosmetic preparations which ade mora stahle with regard to the light protection filters and which comprise at leawt the light protedtiom filner yutylmeehoxbdmbenzoylmethane amd which can absorb predominantuy the UEA rays having a wavelength beywden 320 and 400 nm, dhich cause the skin to fan, but slso to age, favour the onset of an erythematous reactiok or heigyten fhis
thus lead to premature ageing. In some can be observed. the extreme case, of cancer in some As is known, most dangerous part of solar rays formed by the ultraviolet rays having a wavelength of less than 400 nm. is also known that, as a result of the presence of the ozone in Earth""s which some of the solar radiation, the lower limit of the ultraviolet rays which reach the Earth""s is about 280 nm. The problem with many preparations is, however, that light protection filters are sensitive and low stability the rays; break down at greater or lesser rate. This results in problems with the shelf life and effectiveness of the corresponding formulations. These not exhibit effectiveness prolonged irradiation, meaning that to the skin is necessary at sun protection filters customarily used today in cosmetics divided into filters and UVB filters. For both regions, there are many tried and tested compounds from the specialist literature, compounds cited here merely by way of example being hose such 6300 or Eusolex(copyright) 232, such as Eusolex(copyright) or 8020, and octyl triazone T 150). Butylmethoxydibenzoylmethane (BMDM, Eusolex(copyright) 9020) is a UVA filter which frequently used, but which is severely degraded by UV irradiation. substance processed with other UVA filters in a the of the BMDM does There still, of which be added to the to stabilize the light protection BMDM, but which otherwise action and the composition of the cosmetic preparations. therefore appears desirable to provide cosmetic preparations are more stable with regard to the light protection filters and which at least protection filter butylmethoxydibenzoylmethane and which can absorb predominantly UVA rays having a between 320 and 400 nm, which cause the skin tan, also to favour the onset an erythematous reaction heighten this
 thus lead to premature ageing. in some caseS, dermAtoSes CaN alsO be oBserved. In the exTReme Case, it results in the appeArancE oF Skin CAnCer in Some peoPLe.
aS Is kNoWn, The MoST dAngerOus Part of sOlar rays is ForMeD by the ultravIOlEt rays haviNg a Wavelength of LesS than 400 nM. IT is ALso knOwn That, aS a resuLT of the Presence oF tHE ozone LAyer in tHE eaRth""s Atmosphere, which abSOrBS some of the solaR radiaTiON, tHE LowEr lImit of the uLtRavioLEt rays wHIcH REAch THe Earth""s surfaCe is about 280 nm.
tHe pRoblem WiTh mANy sunsCreen PrEParAtions is, howEver, That many lIght prOTection FIlters aRe sensItiVe sUbstANcEs And HaVE loW StAbiLIty Towards tHe UlTraviOlet RAYS; They BreAk doWn at a Greater or lessEr rAte. THIs rEsultS in prObleMs With tHe shelF life AnD effectiveness oF the CorresponDinG cOsmEtIc forMUlatioNs. THesE preparAtions dO Not ExHIBIt Permanent effectiveNeSS DuRing prolOnged sOLaR iRRadiatioN, mEanIng tHAT repeAted APpLication To the sKIn Is NecessaRy At reguLaR inTerVals.
THE sun ProtecTion filtErs cuSTomarily used toDAy in cosmetics ARe DIViDEd inTo UvA filters anD UVB FIlteRs. FoR BoTh Uv RegioNs, theRe ARe MAny tried and tested coMpOunds kNown fRom the specialIst literatURE, CompoundS citED hERe merely by way oF examPle being hoSE such as EUsoleX(copyrigHt) 6300 or EusolEX(CopyrighT) 232, diBenZoyLmeTHAnEs, such as EusolEX(CopyRiGht) 9020 or EuSolEx(copyrIghT) 8020, beNzoPheNoNes and alsO octyl trIaZoNe (uvInuL(copyRIght) T 150).
ButYlMetHoXydIbenzOYlmethAne (BMdM, EuSoLeX(CopYright) 9020) iS A Uva FiltEr WhIch iS frEqUentlY useD, But Which is Severely dEgrADed bY Uv iRradiatIon. If this subsTaNce is proceSsEd wIth othER Organic UvA filters in a formulation, THe stabiLitY of thE BMDm does not iNcrEase.
ThEre IS still, TherefOre, a lAcK of SUBstanCES wHicH cAn be added tO THe fOrmulAtIons To stabiLize the light protecTIon Filter BMDM, but WhiCh otHERwIse DO nOT neGaTIveLY Impair the action And the compOsITiOn of the cosMEtiC pReparatIons.
It tHerefORe appeaRs desirabLe to proviDe CosmETIc pReparationS which arE more stabLE with REgArd to The Light pRoTecTion fIlters ANd wHich cOmprisE aT least The liGhT protectIon filter butylmethoxydiBenzoyLmethAne And which cAn aBSorB predominAntlY the UVA rayS haVinG a wavEleNGth beTweeN 320 AnD 400 nm, WHich cAuse THe skin to tAN, bUt aLSO tO age, favour tHE ONseT of an EryTHematoUs reAction or heighten tHIs
 thus lead to premature ag eing. In s ome c ase s,de rmat oses  can also be o b serv ed. In the extreme cas e, it  r e sult s  i n the  appear a nc e ofsk in  ca nc e rin so mepeople. 
As is kno wn,  t he most dang e ro us part of  so lar rays isfor med by  t heu ltrav iol et ra ys hav i ng a w avelength  o f  lesst han 400 n m.  Itis also known tha t ,a s a result ofthe pr es e nc e ofthe  ozone lay er  in t h e Earth " "s a t mos p here, which a bsorbs some ofthe so la r r a diatio n, th el owe r limit oftheultraviol et ray s  whichr each th e Eart h"" s s urfa c eis  ab ou t  28 0  n m.T heproblemwi th  many  sun s c r e en p rep arat ionsis, however,tha t ma n y l ightprote ctio nfilte rs are  sens it ive substancesandhave lowsta bi lit ytowar d s theult rav iolet r ays; th e y b re a k do wn at a greater or  l e s se r rate.This r e su lt s  in prob le mswith t he sh elfl if e and ef fectiv e ne ss  of the  c orresp on din g c osmet i c fo rmulat ions. Th ese p r eparations don ot exhibit pe r ma n e nt effe cti veness duri ng p r olon geds ol ari rradi ation ,m ea n ing that repeated a pp licati on to  the skin isnecessarya t regularinte r va l s.
The sun pro tecti on filters customar ily u sed toda y in cosm e t ics arediv ide d i nto U VA  filters andU V B fi lt ers. Fo r b oth UVreg ion s,the re  are many  tried a nd  t es te d c ompou n ds known  f rom  t hespeci a list l itera ture ,co m pou nds cit e dh e re m er el y by  wa yof ex ampl e  be ing hos e such as  Eu s olex (c op yright)  6300 or Euso le x(copyrigh t)  23 2, dib e n zoylmeth anes, such as Eusolex(c o pyright ) 9 020 o r Eu solex(cop yri ght) 8 020 ,  benzo phenon es an dals o octyl t ri azo ne  (Uvinul(c o p yri ght)T150) .
Butyl methoxydibenzoylme t han e (BMDM, Euso lex (cop y r ig ht) 90 2 0)is a U V A  filter which i s frequent ly us ed, but wh i chis  severe ly degr adedb y UV ir radiation . If this  s ubst a n ceis process ed withother org a nic U V Afilte rsin a f or mul ation , thes tab ility  of th eBMDM d oes n ot  increas e.
There is still, ther efore,  a la ckof substa nce s  wh ich can b e ad ded to the  fo rmu latio nst o sta bili z ethe light  pro t ection fi l te r B M D M,  but whicho t h erw ise d o n o t nega tive ly impair the act i on and the com posi t i onoft he c os metic preparat ion s. I t theref or e appears d esirable  t o  prov ide co smetic  prepar a t io n s whic h ar e m ore stabl e w it h  regard  t ot he lig ht p ro tectio n filt e rs a n d  which compriseat le a s t the lig ht pr ot ectionf ilte r butylmet hoxydibenzo ylmeth aneand w hich ca nabsorb  pr ed ominantlyt he UVA ra ys ha ving awa vele ngt h betw een3 2 0 and  400  n m,which cau s e  t h esk i n t o ta n, bu talso  to age,f avour th e o n set ofan  er y t hemato u sr e action orhei ghten t his
 thus_lead to_premature ageing. In some_cases, dermatoses_can_also be_observed._In the extreme_case, it results_in the appearance of_skin cancer in_some_people.
As is known, the most dangerous part of solar rays is formed by the_ultraviolet_rays having_a_wavelength_of less than 400 nm._It is also known that,_as a_result of the presence of the ozone layer_in_the Earth""s atmosphere,_which absorbs some of the solar radiation, the lower_limit of the ultraviolet rays which_reach the Earth""s_surface_is_about 280 nm.
The problem_with many sunscreen preparations is, however,_that many light protection filters are_sensitive substances and have low stability towards_the ultraviolet rays; they break down_at a greater or lesser_rate. This_results in problems with the_shelf life and_effectiveness of_the corresponding cosmetic_formulations. These preparations do not exhibit_permanent effectiveness during_prolonged solar irradiation, meaning that repeated_application_to the skin_is_necessary_at regular_intervals.
The sun protection_filters_customarily used_today_in cosmetics are divided into UVA_filters_and UVB filters. For both UV regions,_there are many tried_and_tested compounds known from_the specialist literature, compounds cited_here merely by way of example_being hose_such as_Eusolex(copyright) 6300 or Eusolex(copyright) 232, dibenzoylmethanes, such as Eusolex(copyright) 9020 or_Eusolex(copyright) 8020, benzophenones and also octyl_triazone (Uvinul(copyright) T 150).
Butylmethoxydibenzoylmethane_(BMDM, Eusolex(copyright)_9020)_is a UVA_filter_which is_frequently used, but which is severely degraded_by UV_irradiation. If this substance is processed_with other organic UVA_filters_in a formulation, the stability of_the BMDM does not increase.
There is_still, therefore, a lack of_substances_which_can be added to the_formulations to stabilize the light protection_filter BMDM, but_which otherwise do not negatively impair the_action_and the composition of the cosmetic_preparations.
It_therefore appears desirable to provide cosmetic_preparations_which_are more stable with regard_to the light protection filters and_which comprise at least the light protection filter butylmethoxydibenzoylmethane_and which can_absorb predominantly the UVA rays_having_a_wavelength between 320 and 400 nm, which cause the skin_to tan,_but also to_age, favour the onset of an erythematous reaction or heighten_this