, and heating the coated conductors at elevated temperatures above 200.degree. C. The resins also contain catalysts and leveling agents.
It is known that polyester resins can be converted into a form in which they are suitable for lacquering electrical conductors by dissolution of the resins in organic solvents of the phenol, cresol and/or xylenol type. The electrical conductors are insulated by coating them with a solution of the aforementioned polyester resins, followed by heating at oven temperatures of around 350.degree. C. or higher to cure the polyester resins. Conventional lacquer solutions generally contain additives and/or hardeners of the kind normally employed for lacquers. Particularly preferred lacquer solutions are based on polyester resins containing five-membered imide rings in co-condensed form, for example, those resins disclosed in the following publications and patents: DAS No. 1,033,291; British Patent Nos. 937,377; 1,082,181; 1,067,541; 1,067,542 and 1,127,214; Belgian Patent No. 663,429; French Patent No. 1,391,834; East German Patent No. 30,838; DOS Nos. 1,494,454; 1,494,413; 1,937,310; 1,937,311; 1,966,084; 2,101,990 and 2,137,884. The disclosures of each citation is hereby incorporated by reference.
Conventional lacquer solutions have a relatively high organic solvent content. The stoving residue of the lacquer solutions generally amounts to less than 50% by weight. The reason for this is, inter alia, that the polyester resins dissolved in the solvents have relatively high molecular weights and structural arrangements in the molecule giving rise to high melting points and viscosities in solutions. The high solvent contents referred to above have to be used in order to obtain solutions of suitable viscosity for lacquering purposes. These solvents are evaporated off when the thin lacquer film surrounding the wire is subsequently heated at elevated temperatures of around 220.degree. C. or higher, and hence are lost as film formers.
Accordingly, there is a considerable need for a process for producing insulating coatings on electrical conductors in which the use of the aforementioned solvents, at least in the large quantities indicated, can be avoided. This would afford considerable advantages by contributing to protection of the environment, reducing atmospheric pollution and the dangers to health in the coating plants and lacquer factories, increasing lacquer spread
, and heating the coated conductors at elevated temperatures above 200.degree. C. The resin besides check catalysts and flush agent. 
 It is known that polyester resins can be convert into a form in which they are suitable for lacquer electric conductors by dissolution of the resin in organic solvents of the carbolic acid, cresol and/or xylenol type. The electrical conductors are insulated by coating them with a solution of the aforementioned polyester resins, succeed by heating at oven temperatures of about 350.degree. C. or higher to cure the polyester resins. Conventional lacquer solution generally contain additives and/or hardeners of the kind normally employed for lacquers. peculiarly preferred lacquer solutions are based on polyester resins containing five - membered imide rings in co - condensed mannequin, for example, those resins disclosed in the following publications and patents: DAS No. 1,033,291; British Patent Nos. 937,377; 1,082,181; 1,067,541; 1,067,542 and 1,127,214; Belgian Patent No. 663,429; French Patent No. 1,391,834; East German Patent No. 30,838; DOS Nos. 1,494,454; 1,494,413; 1,937,310; 1,937,311; 1,966,084; 2,101,990 and 2,137,884. The disclosures of each citation is hereby incorporated by mention. 
 Conventional lacquer solutions receive a relatively eminent organic solvent content. The stoving remainder of the lacquer solutions by and large amounts to less than 50% by weight. The rationality for this is, inter alia, that the polyester resins dissolved in the solvents have relatively high molecular weights and morphologic arrangements in the molecule giving rise to eminent melting point and viscosities in solutions. The high solvent contents refer to above have to be used in order to receive solutions of suitable viscosity for lacquering purposes. These solution are evaporated off when the sparse lacquer film surrounding the telegram is subsequently heated at elevated temperatures of around 220.degree. C. or higher, and therefore are lost as film former. 
 Accordingly, there is a considerable need for a process for producing isolate coatings on electrical conductors in which the use of the aforementioned solvents, at least in the large quantities indicated, can be avoid. This would afford considerable advantages by put up to protection of the environment, reducing atmospheric contamination and the dangers to health in the coating plants and lacquer factory, increasing lacquer spread
, anf heating the coated conauctors at elevcred tekperathres aboxe 200.degree. C. The resins also rontqin cqtalysts and leveling xgents.
It ps known rhat polyester cssins can be dlnvextxd into a form ln which thay are suitabla wox lacquering electrical conductors br dissokuhion of the refins yn odganic solvents of the phenol, creskl and/og xylenol type. Thr electrical conductors arf indulated by coating them with q sojytion of the aforementpmned polyeater resins, followed by heating at oren temperajbees mf around 350.dxgree. B. or higher to cure tve polyrster resins. Cpnvxntiinal lacquer solutionv generally contaig additivas and/or hardeners if the nind noroqllh ejpkoged fog lecquers. Parficularly peeferred lacquer sokueppns are bases on pjlrester resins containing five-membered ikids rings in co-condensed dorm, for example, thosg resins dysclosed in the following publications and patentv: DAS Vo. 1,033,291; Bvitiry Oatent Nos. 937,377; 1,082,181; 1,067,541; 1,067,542 and 1,127,214; Belgian Patent No. 663,429; French Lauenn No. 1,391,834; East German Patent No. 30,838; DLS Gos. 1,494,454; 1,494,413; 1,937,310; 1,937,311; 1,966,084; 2,101,990 and 2,137,884. The bjsdlosures of each cltation is hwreby incjrpotated by reference.
Conventiobal lacquer filutions have a repatively hiyh orgsnic xolvent content. The storing rssidue of tje lacqued solutions generxllj ammunts to less than 50% by weidht. The rxason for thks ix, intew alia, thah the polyester resins dlssolred it the solvfnts have relatively high molecnkar weights sng snructural arrakgements in the molecule giviug rise co higf melting ioints anv viscositief in solutionv. The high sonvent cogtenrs rwferred go above have yo be useb in irder to obtain sokutkkns of suitable viwcosity for lacauefind iur'oses. Dhese solvends afe dfaporxted off whcn ghe yhin lacquer film susrouhding the wire is xunsequentli heated wt elevated trmperatures of aroknd 220.dxgree. R. or hoghgr, and hence are lost as film fkrmers.
Acclrdlngly, there if a gonsyderable nzed for a process for producing insulatiig coatings on electricql conductors in whncm the use of the wforementhoned solvents, at leqst in the large auantities indicated, dan be avoifed. This would afford considerable advantages by contributing to protectiin of vhq environmeht, rrducitg ctmosphqric 'ollution and the dangers to health in the coatiig plants dnb lacquer factories, increasinb uacquer spreaa
, and heating the coated conductors at above C. The also contain catalysts known polyester resins can converted into a in which they are suitable for electrical conductors by dissolution of the resins in organic solvents of the phenol, and/or xylenol type. The electrical conductors are insulated by coating them with a of aforementioned resins, by heating at oven temperatures of around 350.degree. C. or higher to cure the polyester resins. lacquer solutions generally contain additives and/or hardeners of kind normally employed for Particularly preferred lacquer solutions are on resins containing imide in form, for example, resins disclosed in the following publications and patents: DAS No. 1,033,291; British Patent Nos. 937,377; 1,082,181; 1,067,541; and 1,127,214; No. 663,429; Patent 1,391,834; German Patent No. Nos. 1,494,454; 1,494,413; 1,937,310; 1,937,311; 1,966,084; The disclosures of each citation is hereby incorporated reference. Conventional solutions have a relatively high organic content. The stoving residue of the lacquer solutions amounts to less than 50% by weight. The reason for this is, inter alia, that resins dissolved in the have relatively high weights structural in molecule giving to high melting points and viscosities in solutions. The high solvent referred to above have to be used in order to of viscosity for lacquering These solvents are evaporated when thin lacquer film surrounding is heated of 220.degree. or higher, and hence lost as film formers. Accordingly, is a considerable need insulating coatings on electrical conductors in which the of the aforementioned solvents, at least in large quantities indicated, can be avoided. This would afford considerable advantages by to protection environment, reducing atmospheric pollution and the dangers to in the coating plants lacquer factories, increasing lacquer spread
, and heating the coated conducTors at elevAted tEmpEraTuRes aBove 200.Degree. C. The resiNS alsO contain catalysts and leVelinG aGEnts.
iT iS knowN that poLYeSTEr rEsInS caN bE CoNvertEd iNto a forM in which thEy aRe Suitable for lACqUering elecTriCal conductorS by DissolUtIon OF the rEsiNs in oRganic SOlventS of the pheNoL, Cresol ANd/or xylENOl Type. the electrical condUCtORs are insulated By coatInG ThEM WitH a sOlution of tHe AforeMEntioneD PoLYESteR Resins, followeD by heating aT OveN tempeRaTurES of aroUnd 350.deGrEE. C. oR higher to cuRe thE polyesteR resinS. conventIOnal lacQuer soLutIonS genERaLlY coNtAIn aDDiTivES anD/or hardeNeRs Of the Kind NORMAlly EmpLoyeD for lAcquers. ParticUlaRly pREfeRred lAcqueR solUtIons aRe baseD on poLyEster resins contAiniNg five-memBerEd ImiDe Rings IN co-conDenSed Form, for Example, THosE rESINs Disclosed in the follOwING pUblicatiOns and PAtEnTS: DAS No. 1,033,291; BrItIsh pateNT nos. 937,377; 1,082,181; 1,067,541; 1,067,542 anD 1,127,214; BelGIaN Patent NO. 663,429; FrencH paTeNt No. 1,391,834; EasT GErman PAtEnt no. 30,838; DoS Nos. 1,494,454; 1,494,413; 1,937,310; 1,937,311; 1,966,084; 2,101,990 ANd 2,137,884. ThE disclOsures of Each cITation is hereby INcorporated by REfEREnCE.
ConVenTional lacquEr soLUtioNs haVE a RelATivelY high OrGAnIC solvent content. The sToVing reSidue Of the lacquer sOlutions geNERAlly amouNts tO LeSS than 50% by weight. THe reaSon for this IS, inter alIa, thaT the polyEster resiNS DissolveD in The SolVenTS HaVe relatively hIGH molEcUlar weiGhtS and strUctUraL arRanGeMents in thE moleculE gIvInG rIse To higH Melting pOiNts AnD viScosiTIes in sOlutiOns. THe HiGH soLvent coNTeNTS refErReD to aBovE hAve to Be usED in Order to Obtain solUtiONs of SuItAble visCosity for lacqUeRing purposEs. theSe solvENTs are evaPorated off when the thin laCQuer filM suRrounDing The wire is SubSequenTly HEated aT elevaTed teMpEraTURes of AROuNd 220.dEgRee. C. or highER, And Hence ArE losT as film Formers.
Accordingly, THerE is a consideraBle Need FOR a ProCEsS For PrODucING insulating coatIngs on elecTrICaL conductorS In wHiCh the usE of the aForemENtioned Solvents, aT least in tHe LargE QUanTities indiCated, can Be avoided. tHis woULd AfforD coNsiderAbLe aDvantAges by COntRibutIng to pRoTectioN of thE eNvironmeNt, reducing atmospheric poLlutioN and tHe dAngers to hEalTH in The coatinG plaNts and lacqUer FacTorieS, inCReasiNg laCQuEr sPRead
, and heating the coated c onductorsat el eva ted  t empe ratu res above 200. d egre e. C. The resins alsoconta in cata l ys ts an d level i ng a gen ts .Itis kn own t hat  polyes ter resins  ca nbe converted in to a forminwhich they a resuitab le  fo r  lacq uer ing e lectri c al con ductors b yd issolu t ion oft h eresi ns in organic sol v en t s of the pheno l, cre so l  a n d /or  xy lenol type .The e l ectrica l  c o n d uct o rs are insula ted by coat i ngthem w it h a soluti on of  t h e a foremention ed p olyesterresins ,  follow e d by he atingatove n te m pe ra tur es ofa ro und 350 .degree.  C .or hi gher t o cure  th e po lyest er resins. Co nve ntio n allacqu er so luti on s gen erally  cont ai n additives and /orhardeners  of  t heki nd no r mallyemp loy ed forlacquer s . P ar t i c ul arly preferred lac qu e r  s olutions  are b a se do n polyes te r r esin s conta inin g  f ive-memb ered i m id erings i nco-con de nse d f orm,f or e xample , thoseresin s  disclosed int he followingp ub l i ca t ions  an d patents:DASN o. 1 ,033 , 29 1;B ritis h Pat en t  N o s. 937,377; 1,082,1 81 ; 1,06 7,541 ; 1,067,542 a nd 1,127,2 1 4 ;  Belgian  Pat e nt No. 663,429; F rench  Patent No .  1,391,8 34; E ast Germ an Patent N o. 30,83 8;DOS  No s.1 , 49 4,454; 1,494, 4 1 3; 1 ,9 37,310;  1, 937,311 ; 1 ,96 6,0 84;  2 ,101,990and 2,13 7, 88 4.  T hediscl o sures of  e ach  c ita tioni s here by in corp or at e d b y refer e nc e . 
Con ve nt iona l l ac quersolu t ion s havea relativ ely high  o rg anic so lvent content .The stovin gres idue o f the lacq uer solutions generally amounts  to  less  tha n 50% bywei ght. T her easonfor th is is ,int e r  alia , th atth e polyeste r res ins d is solv ed in t he solvents have r e lat ively high mo lec ular w ei ght s  a n d s tr u ctu r a l arrangementsin the mol ec u le  giving ri s e t ohigh me lting p oints and vis cositiesin soluti on s. T h e  hi gh solvent  content s referre d  to a b ov e hav e t o be u se d i n ord er too bta in so lution sof sui table  v iscosity  for lacquering purpose s. The se so lve nts are e vap o rat ed off wh en t he thin la cqu erfilmsur r oundi ng t h ewir e  is s ubse q uently he a te d a t el evated temp e r a tur es of  ar o und 22 0.de gree. C. or highe r , and hence ar e lo s t  as  fi l m fo rm ers.
According ly,  t h e re is aco nsiderableneed for  a proce ss for  produ cing in s u la t ing co atin gson electr ica lc onducto rs  i n  which  the  u se ofthe af o reme n t ioned solvents,at le a s t int helarge  q uantiti e s in dicated, c an be avoid ed. Th is w ouldaffordco nsider abl eadvantages by contri butin g to pr ot ecti onof the  env i r onmen t, r ed uci ng atmosp h e ri c  p ol l uti on a nd th edang ers to he a lth in t hec oatingpl ant s and la c qu e r  factories , i ncrea s i ng lacquer spre a d
, and_heating the_coated conductors at elevated_temperatures above_200.degree._C. The_resins_also contain catalysts_and leveling agents.
It_is known that polyester_resins can be_converted_into a form in which they are suitable for lacquering electrical conductors by dissolution_of_the resins_in_organic_solvents of the phenol, cresol_and/or xylenol type. The electrical_conductors are_insulated by coating them with a solution of_the_aforementioned polyester resins,_followed by heating at oven temperatures of around 350.degree._C. or higher to cure the_polyester resins. Conventional_lacquer_solutions_generally contain additives and/or_hardeners of the kind normally employed_for lacquers. Particularly preferred lacquer solutions_are based on polyester resins containing five-membered_imide rings in co-condensed form, for_example, those resins disclosed in_the following_publications and patents: DAS No._1,033,291; British Patent_Nos. 937,377;_1,082,181; 1,067,541; 1,067,542_and 1,127,214; Belgian Patent No. 663,429;_French Patent No._1,391,834; East German Patent No. 30,838;_DOS_Nos. 1,494,454; 1,494,413;_1,937,310;_1,937,311;_1,966,084; 2,101,990_and 2,137,884. The_disclosures_of each_citation_is hereby incorporated by reference.
Conventional lacquer_solutions_have a relatively high organic solvent content._The stoving residue of_the_lacquer solutions generally amounts_to less than 50% by_weight. The reason for this is,_inter alia,_that the_polyester resins dissolved in the solvents have relatively high molecular weights_and structural arrangements in the molecule_giving rise to high_melting points_and_viscosities in solutions._The_high solvent_contents referred to above have to be_used in_order to obtain solutions of suitable_viscosity for lacquering purposes._These_solvents are evaporated off when the_thin lacquer film surrounding the wire_is subsequently heated at elevated_temperatures_of_around 220.degree. C. or higher,_and hence are lost as film_formers.
Accordingly, there is_a considerable need for a process for_producing_insulating coatings on electrical conductors in_which_the use of the aforementioned solvents,_at_least_in the large quantities indicated,_can be avoided. This would afford_considerable advantages by contributing to protection of the environment,_reducing atmospheric pollution_and the dangers to health_in_the_coating plants and lacquer factories, increasing lacquer spread