, (2) a multilayer printed wiring board using such a prepreg of excellent properties, and (3) a process for producing such a multilayer printed wiring board.
The present invention provides:
a prepreg which is composed of a mixture of a polycarbodiimide resin and an epoxy resin and which has a film shape;
a prepreg composed of (1) a mixture of a polycarbodiimide resin and an epoxy resin and (2) a base material;
a multilayer printed wiring board obtained by alternately laminating an internal substrate and an insulating adhesive layer and adhering them to each other, wherein the above prepreg is used as the insulating adhesive layer; and
a process for producing a multilayer printed wiring board, which comprises alternately laminating an internal substrate and the above prepreg, adhering them to each other, and allowing all the internal substrates to communicate with each other at the required portions. In German patent document 37 40 916, the application of a wear-reducing coating on the surface of a worm or screw for a plastifying device is disclosed in which molybdenum or a molybdenum-containing coating material is applied to a surface of the worm or screw body, the coating on the body is subjected to heat to effect fusion between the coating and the underlying base material, and the coated screw or worm is thereupon cooled.
As noted, the plastifying device can be an extruder, injection-molding machine or compounder and, for the purpose of this description, all such machines will be understood as comprised within the term "extruder" where that term is used to describe a machine or device embodying the invention.
An extruder can be used, for example, to produce articles of synthetic resin material, plastic or rubber and can comprise a housing and at least one worm or screw rotatable in this housing to displace the material to be processed through the housing. During the rotation of the worm or screw and the passage of the flow of the plastic or plastifiable material through the housing, the rib, thread or flight of the worm or screw may be subject to considerable and continuous wear.
In addition, there may be direct contact between the outer surface of the flight and the wall of the screw housing. To minimize mechanical deterioration of the parts in contact, good emergency running properties must be provided at the contact surfaces.
In the past this has generally been obtained by coating the outer surfaces of the
, (2) a multilayer printed wiring board using such a prepreg of excellent properties, and (3) a procedure for produce such a multilayer printed wiring board. 
 The present invention provides: 
 a prepreg which is compose of a mixture of a polycarbodiimide resin and an epoxy resin and which has a movie shape; 
 a prepreg composed of (1) a mixture of a polycarbodiimide resin and an epoxy resin and (2) a foundation material; 
 a multilayer printed wiring circuit board obtained by alternately laminating an inner substrate and an insulating adhesive level and adhering them to each other, wherein the above prepreg is use as the insulating adhesive layer; and 
 a procedure for producing a multilayer printed wiring board, which constitute alternately laminating an internal substrate and the above prepreg, adhering them to each early, and allowing all the inner substrates to communicate with each other at the ask portions. In German patent document 37 40 916, the application of a wear - reducing application on the open of a worm or screw for a plastifying device is disclosed in which molybdenum or a molybdenum - containing coating material is applied to a surface of the worm or screw body, the application on the torso is subjected to inflame to effect coalition between the coating and the underlying base material, and the coated prison guard or worm is thereupon cooled. 
 As noted, the plastifying device can be an extruder, injection - molding machine or compounder and, for the function of this description, all such machines will be understood as comprised within the term " extruder " where that term is used to trace a machine or device embodying the invention. 
 An extruder can be used, for example, to grow articles of man-made resin material, plastic or rubber and can comprise a housing and at least one worm or prison guard rotatable in this housing to displace the material to be process through the housing. During the rotation of the worm or screw and the passage of the flow of the credit card or plastifiable material through the housing, the rib, thread or flight of the worm or screw may be capable to considerable and continuous wear. 
 In addition, there may be direct contact between the out surface of the escape and the wall of the screw caparison. To minimize mechanical deterioration of the parts in contact, good emergency running properties must be provided at the contact surfaces. 
 In the past this has generally been obtained by coat the outer surfaces of the
, (2) a multilayer printed wirikg board using socy a prxpreg or excelldnt properties, and (3) a procesd dor peoducing such a multilxyer prinned wirint boerd.
The present iibention proviscs:
a pxe'reg which is cpmposed of a mixture of d oopycarbodiimide resin and an epoxy rqsin anc ahich has a fijm snwpe;
a irtpreg composed of (1) a mixture of a polycagbodiimide resin snd an epoxy resin and (2) a hase material;
a multilajer printed wirybg board obtxined by alternately lzminating an internal substrate and cn insulatibg adjgsive layer end adrering them bp each other, eherein the abpve prwpreg is used as the mnsulating adhesive jayer; and
d 'rocess for producing a multhlayar pfuntdd sicinf boarf, wiich compriaes alternarely laminating an onevtnal substrafe and tre above prepreg, adhering them to each mthsr, and allowing all the internal substrates jo communisate with each other at the required portions. In Cermai oattnb aickment 37 40 916, the application of a wear-reducing cowfimg on the surfacc of a worm or scrrw fpt a plastifyine devies js disclosed in whlch molibdenun or a mojybdrnum-containing coating mateeial is applped ro a surface of thz worm or scxew bocy, thr coating on the body ir sugjected to jeat to erwect fusion betwden tve coating and the underlyyng base natexial, and the coateq screw or worm is thereupon coolef.
As nltad, the pladtifying device can be an extruvxr, injection-mplginc machinz or cpmpounder and, for the purpoxe of tkis dercription, zll suci machines wyll be undersdlod as comprmsed withyn tye twrm "extfjder" where thay term is used to dwscribe a machine pr asvice embodying tht unvention.
An exyruaer cwn bq used, for exdmpld, tu prodjce articlew of xynthetic resin matesial, plastic or rubber akd can conprise a housing and st least one worm lr sccew rovatablr ig this housing to displace the material to be processeq thvougr the housnng. During the rotation of the worm or srrew and the passage of the flow of the plcsuic or plastihiable material through the housing, the rib, thread ov flight of the worm od scref may be subject to considerable and continuous wear.
In addition, there may be durect rogtact betwesn tne ouner xurfacq of vhe flight and thv wall of the screw housing. To mmnimize mewhcnical deterioration of the psrgs in contact, good emergency running lropertirs must be provided at the contsct surfaces.
In the past bhis has tenerzlly bvgn ubtained by coatinb the muter surfacws on the
, (2) a multilayer printed wiring board a of excellent and (3) a multilayer wiring board. The invention provides: a which is composed of a mixture a polycarbodiimide resin and an epoxy resin and which has a film shape; prepreg composed of (1) a mixture of a polycarbodiimide resin and an epoxy and a material; multilayer printed wiring board obtained by alternately laminating an internal substrate and an insulating adhesive layer adhering them to each other, wherein the above is used as the adhesive layer; and a process producing multilayer printed board, comprises laminating an internal and the above prepreg, adhering them to each other, and allowing all the internal substrates to communicate each other required portions. German document 40 916, the a wear-reducing coating on the surface or screw for a plastifying device is disclosed which molybdenum a molybdenum-containing coating material is applied a surface of the worm or screw body, coating on the body is subjected to heat to effect fusion between the coating and base material, and the screw or worm thereupon As the device can an extruder, injection-molding machine or compounder and, for the purpose of description, all such machines will be understood as comprised within "extruder" that term is to describe a machine device the invention. An extruder used, example, of resin plastic or rubber and comprise a housing and at one worm or screw displace the material to be processed through the During the rotation of the worm or and the passage of the flow of the plastic or plastifiable material the housing, thread or flight of the worm or screw be subject to considerable continuous wear. In addition, there may be direct contact the surface of flight and the of the screw To minimize mechanical the parts contact, emergency be provided at the contact surfaces. the this has generally been obtained coating surfaces of the
, (2) a multilayer printed wiring bOard using sUch a pRepReg Of ExceLlenT properties, and (3) A ProcEss for producing such a muLtilaYeR PrinTEd WirinG board.
THE pRESenT iNvEntIoN PrOvideS:
a pRepreg wHich is compOseD oF a mixture of a POlYcarbodiimIde Resin and an epOxy Resin aNd WhiCH has a FilM shapE;
a prepREg compOsed of (1) a miXtURe of a pOLycarboDIImIde rEsin and an epoxy resIN aND (2) a base material;
A multiLaYEr PRIntEd wIring board ObTaineD By alterNAtELY LamINating an interNal substratE And An insuLaTinG AdhesiVe layEr ANd aDhering them To eaCh other, whErein tHE above pREpreg is Used as The InsUlatINg AdHesIvE LayER; aNd
a PRocEss for prOdUcIng a mUltiLAYER priNteD wirIng boArd, which comprIseS altERnaTely lAminaTing An InterNal subStratE aNd the above preprEg, adHering theM to EaCh oThEr, and ALlowinG alL thE internAl substRAteS tO COMmUnicate with each othEr AT ThE requireD portiONs. in gErman patEnT doCumeNT 37 40 916, The apPlicATiOn of a weaR-reducINg CoAting on ThE surfaCe Of a WorM or scREw foR a plasTifying dEvice IS disclosed in whICh molybdenum oR A mOLYbDEnum-ConTaining coatIng mATeriAl is APpLieD To a suRface Of THe WOrm or screw body, the coAtIng on tHe bodY is subjected tO heat to effECT Fusion beTweeN ThE Coating and the uNderlYing base maTErial, and The coAted screW or worm is THEreupon cOolEd.
AS noTed, THE pLastifying devICE can Be An extruDer, InjectiOn-mOldIng MacHiNe or compoUnder and, FoR tHe PuRpoSe of tHIs descriPtIon, AlL suCh macHInes wiLl be uNderStOoD As cOmpriseD WiTHIn thE tErM "extRudEr" Where That TErm Is used tO describe A maCHine Or DeVice embOdying the inveNtIon.
An extruDeR caN be useD, FOr examplE, to produce articles of synTHetic reSin MaterIal, pLastic or rUbbEr and cAn cOMprise A housiNg and At LeaST One woRM Or ScrEw Rotatable iN THis HousiNg To diSplace tHe material to be procESseD through the hoUsiNg. DuRINg The ROtATioN oF The WORm or screw and the Passage of tHe FLoW of the plasTIc oR pLastifiAble matErial THrough tHe housing, The rib, thrEaD or fLIGht Of the worm oR screw maY be subjecT To conSIdErablE anD contiNuOus Wear.
IN additIOn, tHere mAy be diReCt contAct beTwEen the ouTer surface of the flight anD the waLl of tHe sCrew housiNg. TO MinImize mechAnicAl deteriorAtiOn oF the pArtS In conTact, GOoD emERgencY runNIng properTIeS muST Be Provided at tHE COntAct suRfaCEs.
In thE pasT this has generally BEen obtained by cOatiNG The OutER surFaCes of the
, (2) a multilayer printed  wiring bo ard u sin g s uc h aprep reg of excelle n t pr operties, and (3) a pr ocess  f o r pr o du cingsuch am ul t i lay er  p rin te d  w iring  bo ard.
Th e presentinv en tion provide s :a prepregwhi ch is compos edof a m ix tur e  of a  po lycar bodiim i de res in and an  e p oxy re s in andw h ic h ha s a film shape;
a pr e preg composedof (1)  a mi x t ure  of  a polycar bo diimi d e resin an d a n e p oxy resin and  (2) a base mat erial; 
a  mu l tilaye r pri nt e d w iring board  obt ained byaltern a tely la m inating  an in ter nal  sub s tr at e a nd ani ns ula t ing  adhesiv ela yer a nd a d h e r ingthe m to  each  other, where inthea bov e pre pregis u se d asthe in sulat in g adhesive laye r; a nd
a proc ess  f orpr oduci n g a mu lti lay er prin ted wir i ngbo a r d ,which comprises al te r n at ely lami nating an  i n ternal s ub str atea n d the  abo v eprepreg,  adher i ng  t hem toea ch oth er , a ndallow i ng a ll the  interna l sub s trates to comm u nicate with e a ch o th e r at  th e requiredport i ons.  InG er man paten t doc um e nt 37 40 916, the appl ic ationof awear-reducing  coating o n t he surfa ce o f  a worm or screwfor a  plastifyi n g device  is d isclosed  in which m olybdenu m o r a  mo lyb d e nu m-containingc o atin gmateria l i s appli edtoa s urf ac e of theworm orsc re wbo dy,  thec oating o nthe  b ody  is s u bjecte d toheat  t oe ffe ct fusi o nb e twee nth e co ati ng  andtheu nde rlyingbase mate ria l , an dth e coate d screw or wo rm  is thereu po n c ooled. A s noted,  the plastifying device can beanextru der,  injectio n-m olding  ma c hine o r comp ounde rand , for t h e  p urp os e of thisd e scr iptio n,  all  such m achines will be un d ers tood as compr ise d wi t h in  th e  t e rm"e x tru d e r" where that t erm is use dt odescribe a mac hi ne or d evice e mbody i ng theinvention .
An extr ud er c a n  be  used, for  example , to prod u ce ar t ic les o f s ynthet ic  re sin m ateria l , p lasti c or r ub ber an d can  c omprisea housing and at leastone wo rm or  sc rew rotat abl e  in  this hou sing  to displa cethe  mate ria l  to b e pr o ce sse d  thro ught he housin g .Dur i n gthe rotatio n o f t he wo rmo r scre w an d the passage oft he flow of the  pla s t icorp last if iable material  th ro u g h the ho us ing, the ri b, threa do r fli ght of  the w orm ors c re w  may b e su bje ct to con sid er a ble and  c on t inuous  wea r. 
In ad dition ,  the r e  may be direct c ontac t betwe e n t he ou te r surfa c e of  the fligh t and the w all of  the  scre w housi ng . To m ini mi ze mechani c al deteri orati on of t he  par tsin con tact , goodemer ge ncy  runningp r op e rt ie s  mu st b e pro vi dedat the co n tact sur fac e s.
In t he  pa s t  thish as g enerally b een  obta i n ed by coat i ng t h eo utersurfac es ofthe
, (2)_a multilayer_printed wiring board using_such a_prepreg_of excellent_properties,_and (3) a_process for producing_such a multilayer printed_wiring board.
The present_invention_provides:
a prepreg which is composed of a mixture of a polycarbodiimide resin and an_epoxy_resin and_which_has_a film shape;
a prepreg composed_of (1) a mixture of_a polycarbodiimide_resin and an epoxy resin and (2) a_base_material;
a multilayer printed_wiring board obtained by alternately laminating an internal substrate_and an insulating adhesive layer and_adhering them to_each_other,_wherein the above prepreg_is used as the insulating adhesive_layer; and
a process for producing a_multilayer printed wiring board, which comprises alternately_laminating an internal substrate and the_above prepreg, adhering them to_each other,_and allowing all the internal_substrates to communicate_with each_other at the_required portions. In German patent document_37 40 916,_the application of a wear-reducing coating_on_the surface of_a_worm_or screw_for a plastifying_device_is disclosed_in_which molybdenum or a molybdenum-containing coating_material_is applied to a surface of the_worm or screw body,_the_coating on the body_is subjected to heat to_effect fusion between the coating and_the underlying_base material,_and the coated screw or worm is thereupon cooled.
As noted, the_plastifying device can be an extruder,_injection-molding machine or compounder_and, for_the_purpose of this_description,_all such_machines will be understood as comprised within_the term_"extruder" where that term is used_to describe a machine_or_device embodying the invention.
An extruder can_be used, for example, to produce_articles of synthetic resin material,_plastic_or_rubber and can comprise a_housing and at least one worm_or screw rotatable_in this housing to displace the material_to_be processed through the housing. During_the_rotation of the worm or screw_and_the_passage of the flow of_the plastic or plastifiable material through_the housing, the rib, thread or flight of the_worm or screw_may be subject to considerable_and_continuous_wear.
In addition, there may be direct contact between the outer_surface of_the flight and_the wall of the screw housing. To minimize mechanical deterioration_of the parts in contact, good emergency_running properties must be provided at the contact surfaces.
In the past_this has generally been obtained by coating the_outer surfaces of the