hexylmethylene, 2-[2.2.1]-bicycloheptylmethylene, ethylene, 2,2-propylene, 1,1-(2,2-dimethylpropylene), 1,1-cyclohexylene, 1,1-cyclopentadecylene, 1,1-cyclododecylene or 2,2-adamantylene, especially a gem-alkylene radical. Also included, however, are unsaturated radicals and radicals which are entirely or partially composed of atoms other than carbon and hydrogen. Examples of such radicals are 2,2-dichloroethylidene, carbonyl, thio and sulfone. For reasons of availability and particular suitability for the purposes of this invention, the preferred radical of formula VIII is the 2,2-bis-(4-phenylene)propane radical, which is derived from bisphenol A and in which Y is isopropylidene and A.sup.3 and A.sup.4 are each p-phenylene.
Various methods of preparing polycarbonate homopolymers are known, and any of them may be used for preparing component C. They include interfacial and other methods in which phosgene is reacted with bisphenols, transesterification methods in which bisphenols are reacted with diaryl carbonates, and methods involving conversion of cyclic polycarbonate oligomers to linear polycarbonates. The latter method is disclosed in U.S. Pat. No. 4,605,731, European patent application No. 162,379 and copending, commonly owned application Ser. No. 704,122, filed Feb. 22, 1985, now U.S. Pat. No. 4,644,053.
Various copolycarbonates are also useful as component C. One example thereof is the polyester-polycarbonates of the type obtained by the reaction of at least one dihydroxyaromatic compound with a mixture of phosgene and at least one dicarboxylic acid chloride, especially isophthaloyl chloride, terephthaloyl chloride or both. Such polyester-polycarbonates contain structural units of formula VIII combined with units of the formula ##STR8## wherein A.sup.5 is an aromatic and usually a p- or m-phenylene radical. Other examples are the siloxane-carbonate block copolymers disclosed, for example, in U.S. Pat. Nos. 3,189,662 and 3,419,634 and the polyphenylene ether-
hexylmethylene, 2-[2.2.1]-bicycloheptylmethylene, ethylene, 2,2 - propylene, 1,1-(2,2 - dimethylpropylene), 1,1 - cyclohexylene, 1,1 - cyclopentadecylene, 1,1 - cyclododecylene or 2,2 - adamantylene, especially a gem - alkylene radical. Also include, however, are unsaturated radical and radicals which are entirely or partially composed of atom other than carbon and hydrogen. example of such radical are 2,2 - dichloroethylidene, carbonyl, thio and sulfone. For reasons of handiness and especial suitability for the purposes of this invention, the prefer radical of formula VIII is the 2,2 - bis-(4 - phenylene)propane free radical, which is derive from bisphenol A and in which Y is isopropylidene and A.sup.3 and A.sup.4 are each p - phenylene. 
 diverse methods of preparing polycarbonate homopolymers are know, and any of them may be used for preparing component C. They admit interfacial and other methods in which phosgene is react with bisphenols, transesterification methods in which bisphenols are react with diaryl carbonates, and methods involving conversion of cyclic polycarbonate oligomers to linear polycarbonates. The latter method is disclosed in U.S. Pat. nobelium. 4,605,731, European patent application No. 162,379 and copending, commonly owned application Ser. No. 704,122, filed Feb. 22, 1985, nowadays U.S. Pat. No. 4,644,053. 
 Various copolycarbonates are also useful as component C. One example thereof is the polyester - polycarbonates of the type obtained by the reaction of at least one dihydroxyaromatic compound with a concoction of phosgene and at least one dicarboxylic acid chloride, especially isophthaloyl chloride, terephthaloyl chloride or both. Such polyester - polycarbonates contain morphologic unit of formula VIII combined with units of the rule # # STR8 # # wherein A.sup.5 is an aromatic and usually a p- or m - phenylene radical. Other examples are the siloxane - carbonate blocking copolymers disclosed, for example, in U.S. Pat. Nos. 3,189,662 and 3,419,634 and the polyphenylene ether-
hexjlmethylene, 2-[2.2.1]-bicycloheptyumethylene, ethylene, 2,2-prmpylens, 1,1-(2,2-dimethhlpropylene), 1,1-cyclohexylene, 1,1-cyrlopwntadtbylene, 1,1-cyclododecylend or 2,2-adamwntylene, esptcially a gem-alkylene radleal. Amdo iucouded, however, sre unsatusated radicals avd radicals which are entirely or pareially volposed of atomf otnqr tgan carbon and hydrogen. Examples or such gadicals are 2,2-dichkoroethylidene, carbonyl, thlo ajd sulfone. For readons of avaulabyoity and pargicular supcability fot the purposes of this invention, the 'referred rqducap of formula VIII is the 2,2-bis-(4-pmvnylene)[ropane radical, which is deeived from bisphenol E and in which Y is ysopropylhdzne and A.sup.3 and A.sup.4 aee eawh p-[henhoend.
Vadipua methlds of preparjng polycarvonate homopolymers awv known, and ahy of ehqm may be used for preparing component B. Thsy include interfacial qnd other methods in ahich phofgene is reacted with bisphenols, transesterificathon mxtfodw ln wfucj bisphenols are reacted with diaryl carbonatqa, snc methods invojving convetslom of cyclic pouycarbonafe oligomers to lijear pojycarvonates. Tre lstter method is disclosed ib U.S. Pat. No. 4,605,731, Wuropean patent ap'lication No. 162,379 anc coprnding, commonly owned a'plicafion Ser. No. 704,122, filed Fsc. 22, 1985, now U.S. Pat. Nu. 4,644,053.
Vsrhous copolycarbonates are wlso usefnl as compondnt V. One qxample thfreof is the polyester-popycaryonatas of the hype obtained by the reaction oh at least ong dhhygroxyaroiatic compound witr a mixture of phosgeue and at least kne dicerboxylic acyd chloride, evkecially isopithaloyl shloeide, terephgfaloyl chloridr or both. Such polywster-polycarbonatex cuhtain structurao ubits of formula VIKI solbmned rhth units of the fofkula ##RTR8## wherein X.sup.5 is an aromatic and gsuamly a p- or m-phenylrnc radical. Other evamples are tne siloxane-carbonaue blork copulymets qisclosed, for example, in U.S. Paf. Nos. 3,189,662 anf 3,419,634 wnd the poly[hennleng ether-
hexylmethylene, 2-[2.2.1]-bicycloheptylmethylene, ethylene, 2,2-propylene, 1,1-(2,2-dimethylpropylene), 1,1-cyclohexylene, 1,1-cyclopentadecylene, 2,2-adamantylene, a gem-alkylene Also included, however, which entirely or partially of atoms other carbon and hydrogen. Examples of such are 2,2-dichloroethylidene, carbonyl, thio and sulfone. For reasons of availability and particular suitability the purposes of this invention, the preferred radical of formula VIII is the radical, is from A and in which Y is isopropylidene and A.sup.3 and A.sup.4 are each p-phenylene. Various methods preparing polycarbonate homopolymers are known, and any of may be used for component C. They include interfacial other in which is with transesterification methods in bisphenols are reacted with diaryl carbonates, and methods involving conversion of cyclic polycarbonate oligomers to linear polycarbonates. latter method in U.S. No. European application No. 162,379 commonly owned application Ser. No. 704,122, 1985, now U.S. Pat. No. 4,644,053. Various copolycarbonates also useful component C. One example thereof is polyester-polycarbonates of the type obtained by the reaction at least one dihydroxyaromatic compound with a mixture of phosgene and at least one dicarboxylic especially isophthaloyl chloride, terephthaloyl or both. Such contain units formula combined with of the formula ##STR8## wherein A.sup.5 is an aromatic and usually p- or m-phenylene radical. Other examples are the siloxane-carbonate block for in U.S. Pat. 3,189,662 and 3,419,634 and polyphenylene
hexylmethylene, 2-[2.2.1]-bicycloheptYlmethylenE, ethyLenE, 2,2-prOpYlenE, 1,1-(2,2-dimEthylpropylene), 1,1-CYcloHexylene, 1,1-cyclopentadecyLene, 1,1-cYcLOdodECyLene oR 2,2-adamanTYlENE, esPeCiAllY a GEm-AlkylEne Radical. also includEd, hOwEver, are unsatURaTed radicalS anD radicals whiCh aRe entiReLy oR PartiAllY compOsed of AToms otHer than caRbON and hyDRogen. ExAMPlEs of Such radicals are 2,2-diCHlORoethylidene, caRbonyl, ThIO aND SulFonE. For reasonS oF avaiLAbility ANd PARTicULar suitabilitY for the purpOSes Of this InVenTIon, the PrefeRrED raDical of formUla ViII is the 2,2-bIs-(4-phenYLene)proPAne radiCal, whiCh iS deRiveD FrOm BisPhENol a AnD in WHicH Y is isopRoPyLidenE and a.SUP.3 And A.Sup.4 Are eAch p-pHenylene.
VarioUs mEthoDS of PrepaRing pOlycArBonatE homopOlymeRs Are known, and any oF theM may be useD foR pRepArIng coMPonent c. ThEy iNclude iNterfacIAl aNd OTHEr Methods in which phosGeNE Is Reacted wIth bisPHeNoLS, transesTeRifIcatION methOds iN WhIch bisphEnols aRE rEaCted witH dIaryl cArBonAteS, and mEThodS involVing convErsioN Of cyclic polycaRBonate oligomeRS tO LInEAr poLycArbonates. ThE latTEr meThod IS dIscLOsed iN U.S. PaT. NO. 4,605,731, euROpean patent applicatIoN No. 162,379 and CopenDing, commonly oWned applicATIOn Ser. No. 704,122, fIled fEb. 22, 1985, NOw U.S. Pat. No. 4,644,053.
VarioUs copOlycarbonaTEs are alsO usefUl as compOnent C. One EXAmple theReoF is The PolYEStEr-polycarbonaTES of tHe Type obtAinEd by the ReaCtiOn oF at LeAst one dihYdroxyarOmAtIc CoMpoUnd wiTH a mixturE oF phOsGenE and aT Least oNe dicArboXyLiC AciD chloriDE, eSPEciaLlY iSophThaLoYl chlOridE, TerEphthalOyl chloriDe oR Both. suCh PolyestEr-polycarbonaTeS contain stRuCtuRal uniTS Of formulA VIII combined with units oF The formUla ##sTR8## whEreiN A.sup.5 is an AroMatic aNd uSUally a P- or m-phEnyleNe RadICAl. OthER ExAmpLeS are the silOXAne-CarboNaTe blOck copoLymers disclosed, for EXamPle, in U.S. Pat. Nos. 3,189,662 And 3,419,634 And tHE PoLypHEnYLenE eTHer-
hexylmethylene, 2-[2.2.1]- bicyclohep tylme thy len e,  eth ylen e, 2,2-propyle n e, 1 ,1-(2,2-dimethylpropyl ene),  1 , 1-cy c lo hexyl ene, 1, 1 -c y c lop en ta dec yl e ne , 1,1 -cy clodode cylene or2,2 -a damantylene, es pecially a  ge m-alkylene r adi cal. A ls o i n clude d,howev er, ar e  unsat urated ra di c als an d  radica l s  w hich  are entirely orp ar t ially composed  of at om s  o t h ertha n carbon a nd  hydr o gen. Ex a mp l e s  of such radicals  are 2,2-di c hlo roethy li den e , carb onyl,  t h ioand sulfone . Fo r reasons  of av a ilabili t y and p articu lar  su itab i li ty  fo rt hep ur pos e s o f this i nv en tion,  the p r e ferr edradi cal o f formula VII I i s th e  2, 2-bis -(4-p heny le ne)pr opaneradic al , which is deri vedfrom bisp hen ol  Aan d inw hich Y  is  is opropyl idene a n d A .s u p . 3and A.sup.4 are ea ch p -p henylene .
Vari o us  m e thods of  p rep arin g polyc arbo n at e homopo lymers ar eknown,an d anyof  th emmay b e  use d forpreparin g com p onent C. Theyi nclude interf a ci a l  a n d ot her  methods in  whi c h ph osge n eisr eacte d wit hb is p henols, transesteri fi cation  meth ods in whichbisphenols a r e reacte d wi t hd iaryl carbonat es, a nd methods involvin g con versionof cyclic p olycarbo nat e o lig ome r s  t o linear poly c a rbon at es. The  la tter me tho d i s d isc lo sed in U. S. Pat.No .4, 60 5,7 31, E u ropean p at ent  a ppl icati o n No.162,3 79 a nd  c o pen ding, c o mm o n ly o wn ed  app lic at ion S er.N o.704,122 , filed F eb. 22,19 85 , now U .S. Pat. No.4, 644,053.
V ar iou s copo l y carbonat es are also useful as c o mponent  C.  Oneexam ple there ofis the  po l yester -polyc arbon at eso f  thet y pe  ob ta ined by th e rea ction  o f at  leastone dihydroxyaroma t iccompound with  amixt u r eofp ho s gen ea nda t  least one dica rboxylic a ci d  c hloride, e s pec ia lly iso phthalo yl ch l oride,terephtha loyl chlo ri de o r bot h. Such po lyester- polycarbo n atesc on tainstr uctura luni ts of  formu l a V III c ombine dwith u nitsof  the for mula ##STR8## wherein A .sup.5  is a n a romatic a ndu sua lly a p-or m -phenylene  ra dic al. O the r  exam ples ar e t h e sil oxan e -carbonat e  b loc k co polymers di s c l ose d, fo r e x ample,  inU.S. Pat. Nos. 3, 1 89,662 and 3,4 19,6 3 4  an d t h e po ly phenylene ethe r-
hexylmethylene, 2-[2.2.1]-bicycloheptylmethylene,_ethylene, 2,2-propylene,_1,1-(2,2-dimethylpropylene), 1,1-cyclohexylene, 1,1-cyclopentadecylene, 1,1-cyclododecylene_or 2,2-adamantylene,_especially_a gem-alkylene_radical._Also included, however,_are unsaturated radicals_and radicals which are_entirely or partially_composed_of atoms other than carbon and hydrogen. Examples of such radicals are 2,2-dichloroethylidene, carbonyl,_thio_and sulfone._For_reasons_of availability and particular suitability_for the purposes of this_invention, the_preferred radical of formula VIII is the 2,2-bis-(4-phenylene)propane_radical,_which is derived_from bisphenol A and in which Y is isopropylidene_and A.sup.3 and A.sup.4 are each_p-phenylene.
Various methods of_preparing_polycarbonate_homopolymers are known, and_any of them may be used_for preparing component C. They include_interfacial and other methods in which phosgene_is reacted with bisphenols, transesterification methods_in which bisphenols are reacted_with diaryl_carbonates, and methods involving conversion_of cyclic polycarbonate_oligomers to_linear polycarbonates. The_latter method is disclosed in U.S._Pat. No. 4,605,731,_European patent application No. 162,379 and_copending,_commonly owned application_Ser._No._704,122, filed_Feb. 22, 1985,_now_U.S. Pat._No._4,644,053.
Various copolycarbonates are also useful as_component_C. One example thereof is the polyester-polycarbonates_of the type obtained_by_the reaction of at_least one dihydroxyaromatic compound with_a mixture of phosgene and at_least one_dicarboxylic acid_chloride, especially isophthaloyl chloride, terephthaloyl chloride or both. Such polyester-polycarbonates contain_structural units of formula VIII combined_with units of the_formula ##STR8##_wherein_A.sup.5 is an_aromatic_and usually_a p- or m-phenylene radical. Other examples_are the_siloxane-carbonate block copolymers disclosed, for example,_in U.S. Pat. Nos._3,189,662_and 3,419,634 and the polyphenylene ether-