Document ZJRNmae4zK4vO4ZOgZX5ORRKL

FILE NAME: Dow Chemical (DOW) DATE: 1980 Nov 18 DOC#: DOW004 DOCUMENT DESCRIPTION: US Patent - Asbestos Treatment [Fwd: FW: dow asbestos research program] Images (363 of 465 ) United States Patent Pezzoli 4,234,377 November 18,1980 Asbestos treatment Abstract Aconmseisthtiondg oesfsterenatitainllgyaosfbaetslteoassctoomneprmiseintagl dfeerproosciytainngidoen. at least a portion of the asbestos a material Inventors: Pezzoli; Paul A. (Midland, MI) Assignee: The Dow Chemical Company (Midland, MI) Appi. No.: 737888 Filed: November 2,1976 Current U.S. Class: lntern'1 Class: Field of Search: 162/3; 442244//664514;; 442247//624165;; 442247//634483;; 442248//635708;; 442248//645423; C03B 037/00 162/3,153,181 A42442/71/3211,51,4344,313422,81/4377,184,454,32 1907616 2096538 References Cited [Referenced Bvl U.S. Patent Documents May., 1933 Tucker Oct., 1937 Durrant 162/153. 427/343. Other References MScchNnaitbz,erGe.teatla.,l,,"ANsabteusrteos21H4e,m5o2l2y-s5i2s3",(E1n9v6i7r)o.n. Res. 3, 1-13 (1970). pp. 1-13. PAtrtiomrnaeryy,EAxgaemnitnoerr:FSirmmi:thK; uWszilalji;amJamF.es M. Claims 18 of 29 4/10/2003 10:33 PM [Fwd: FW: dow asbestos research program] What is claimed is: a1m. Aoumntetohfoadmoafttereriaatlincgonassibsetisntogsecssoemnptirailsliyngofdaetploesaistitnognoenmaettalelafsetrraopcoyratnioidneotoftrheedauscbeetshteosheamsuoflfyitciicent activity ofthe asbestos to at least about 9 percent hemolysis. 2. The method of claim 1wherein the asbestos is chrysotile. n3.icTkheel,mtinet(hIoI)d, aonfdcltaitiamni1umwh(eIVre)i.n the metal is selected from the group consisting of cadmium, iron (III),' 4. The method of claim 1wherein the metal is titanium (IV). 5. The method of claim 1wherein the metal is tin (II). 6. The method of claim 1wherein the depositing step comprises: p(ao)rtcioonntaocfttihneg itohneiazasbbelestsoasltwoinththaesaoslubteisotnoso;f an ionizable salt of at least a first metal to deposit at least a (fber)rcoocnytaancitdinegotfhaet alesabsetstthoes fwiristthmaestoalluotinonatsloelausttioanpoorftaiofnerorofcthyeansiudrefascaeltooffthaeseacsobnedstomse. tal to form a 7(I.IIT),hneimckeetlh,otdino(fIIc)l,aainmd6tiwtahneiuremin(ItVhe).first metal is selected from the group consisting of cadmium, iron p8o. tTahsseiumme.thod of claim 6 wherein the second metal is selected from the group consisting of sodium and 91.pTehrceemntebthyowdeoigfhcltatiomab6owuht earceoinnctheentsroatliuotniocnoorrfetshpeoinodniinzgabtoleasasalttuhraasteadssaoltluctoinocneonftrtahteiosnalot.f from about a1b0o. uTth5e pmeerctheondt boyf wcleaiigmht6towhaberoeuitn1th0epesorcluentitobnyowf tehieghiot noifztahbelesaslatl.t has a salt concentration of from g1r1o.uTphceomnseitshtoindgooffcalacimhlo6riwdeh,earesiunlfthatee,ioannidzaabnleitrsaatlet.includes at least one member selected from the 12. The method of claim 6 wherein the ionizable salt is a chloride. a1b3o. uTth1e pmeerctheondt boyf wcleaiigmht6towhaberoeuitntthheecsoonlucetinotnraotifotnhecofrerrerospcoynandiidneg stoalat hsaastuaractoendcseonlturatitoionnooffthferom ferrocyanide ofthe second metal. a1b4o. uTth1e pmeerctheondt boyf wcleaiigmht6towhaebroeuitn1th0epseorcluetnitobnyowf tehieghfterorof cthyeanfeidrreoscaylatnhiadseaocfothnecesnetcroantidonmoetfaflr.om 15. The method of claim 6 wherein the solution of the ionizable salt is an aqueous solution. 19 of 29 4/10/2003 10:34 PM [Fwd: FW: dow asbestos research program] 16. The method of claim 6 wherein the solution of the ferrocyanide salt is an aqueous solution. a1s7b. eTshtoesmweitthhoadt olefacsltaoimne1mwehtaelrefeinrrtohceyadneipdoesistuinspgesntdepedcoinmaprliiqseusidspmraeydiinugma.t least a portion of the 18. The method of claim 17 wherein the medium is water. 19. A method for treating asbestos comprising: f(iar)stslmurertyailnsgetlheceteadsbferostmosthweitghroauspufcfoicniseinsttianmg ooufnctadomf ainumaq, uireoonus(IsIIo)l,untiiockneol,ftainn i(oIIn)i,zaanbdletistaanltiuomf a(tIlVea),sttoa deposit at least a portion of the ionizable salt of the first metal on at least a portion of the asbestos; (sbe)lescltuerdryfirnogmththeeagsbroeustposcofnrosmistisntegpo(fas)owdiituhmananadqupeootausssisuomluttioonfoormf aafesrurfofcicyiaennitdaemoofuansteocfonad metal dfeerproocsiytaenditdoeroefdtuhceeftihrsethmemetaollyotnicaatclteiavsittyaopfotrhtieoansobfesthtoesatsobaetstloesaswt haberoeuitn9thpeericoenniztahbelme osalyltsiws.as 2sa0l.tTohfethmeeftihrsotdmoeftacllafiomr a1s9uifnfcicluiednitntgimageittaotianlglotwhethaesbioesntiozsabalnedstahlet taoqcuoenotuasctsoaltulteiaosnt oafptohretiioonniozfatbhlee asbestos. f2e1r.roAcyfiabnrioduesdaespboessittoesdmonataetrilaelacstoanspiostritniognesosfetnhteiaallsybeosftoassbfeibsteorss ifnibaerssuaffnidciaetnlteaamstoounnet mtoerteadluce the hemolytic activity of the asbestos fibers to at least about 9 percent hemolysis. 2(I2II.)T, nhiecmkealt,etriinal(IoI)f,calnadimtit2a1niwuhmer(eIVin).the metal is selected from the group consisting of cadmium, iron 23. The material of claim 21 wherein the metal is titanium (IV). 24. The material of claim 21 wherein the metal is tin (II). 2to5.abTohuetm5.a0tepreiarcleonftcblayimwe2i1ghwt,hbearseeind tohnetmheetwaleifgehrrtoocfytahneidaesbisesptroess.ent in an amount of from about 0.05 26. The material of claim 21 wherein the asbestos has a fiber length of at least about 0.5 microns. Description BACKGROUND OF THE INVENTION tTrehaistiningvaensbtieosntorse.lates to asbestos. More in particular, the present invention relates to a method of c"Aomsbmesetrocsia"lilsyaimgepnoerrtaanl ttebremcaaupspelioefdthtoeiar gfirboruopusocfhnaartaucrtaelrlyistoicccs.uFrroinugr pfirbinrocuipsaslitlyicpaetse omfiansebraelsstothsat are 20 of 29 4/10/2003 10:33 PM [Fwd: FW: dow asbestos research program] mOifntehreasles,gcehnryersaoltliyleeinsteprewrhoarplsdtchoemmmoesrtciem. pTohretasenta,raeccchoruynstointiglef,ocrroabcioduotli9t5e,paemrcoesnitteoafnthdeawntohrolpdh'syllite. asbestos production. Chemically, chrysotile asbestos is the fibrous form of the mineral serpentine, a hydrated magnesium silicate having the general formula Mg.sub.3 Si.sub.2 O.sub.3 (OH).sub.4. Structurally the chrysotile ansebtwesotroks oisfbsielliiceav(eSdiOto.scuobn.s2i)stteotrfarhoellderda.uTphsihseleatysefroirsminedterflroocmketwd othlraoyuegrhs.cTohmemfiorsntolaxyyegreins aatocmonstiwnuitohuas sceocmopnodsleadyeorfoafnmumagbneersioufmsuhcyhdirnodxiivdiedu(Malgs(hOeeHts.scuobn.2to))rtoecdtainhteodrsac.roTlhlsewwiathllsthoefmthaegansebseiustmoshfyibderorsxiadree layer on the outside. Consequently, one ofthe dominant chemical features of chrysotile asbestos is its alkaline surface characteristics. The surface modification of asbestine minerals, such as chrysotile, has attracted a good deal of attention pfrroomporseesdeaarncdh ewvoarlukaetresddfuorrintgherepcuernptoyseeaorsf.mAoldairfgyeinngucmebrtearinopf rseudrfeatecremtrienaetdmpernotpmerettihesodosf hthaeveasbbeeesntos ofirbcerosr.reTshpeosnedpinrogcaecdiudrteos iimncplurodvee: cthoeatfiinlgtrathtieonsucrhfaacraecotefraisstbicesotofsthfeibfeibrserwsi(tUh .aSp. hPoast.pNhaotse., 3p,o5l3y5p,h1o5s0p,hate, e3n,9h5a7n,c5e71th)e; ttreenastiilnegsatrsebnegstthosoffitbheersfiwbeitrhs m(Ua.gSn.ePsaiut.mNocas.rb1o,n9a8t2e,5o4r2a;n2o,4x5id1e,8o05f ;a2p,o4l6y0v,a7l3e4n)t;mcoeatatilntgo an a(Usb.Se.stPoast.faNbori.c2w,4i0th6,a7n79in);somluixbilneginaodrgeatenrigceonxt iodregatonircensudrefratchee-afcatbivriecafglaemntewreitshisftiabnrtoaunsdawsbaetsetrorsepellent pagoglylommereircatpeasrttoicldeisspoerrasewthateera-ssboelustbolse fmibaecrrso(mUo.Sle.cPualat.rNoorg. a2n,6ic26su,2b1s3ta)n; caendthdroisutgrihbouutitnagnsamsbalelsatomsopurnotdsuocft to reduce dust emitted by the asbestos during handling and use (U.S. Pat. Nos. 3,660,148; 3,967,043). Aprnobalreema sofalcloengceedrlny taosstohceiaptreodduwciethrsaasnbdesutsoesrsexopfoassubrees.tIint ehamsabteeerinalrehpaosrbteedenbythtehepoNteantitoianlahl eSaalftehty Canodunpcleilurthalatfipberrossoinss(awsbheositnohsiasl)ealnadrgseeavmeroaul ntytspeosfoafsbmeasltiogsndaunsctycoafnthdeevreelsoppirdatiosarybltirnagcto(r"fAatsablepstuolsm",onary NmaatyiocnaaulseSavfaertiyouCsofuonrcmilsNoefwcaslrectitneor,geRne&siDs, pSaercttiicounl,aJrluyncea1rc9i7n4o)m. Tahoefrethieslaulnsog,sppleecuurlaatainodnpthearittoansbeeusmtos (aRpp. aFr.eHntolylt,u"nAmsabtecshteodsibs"y, aNnaytuorteh,e2r5s3il,ic8a5te(,1t9h7e5re))h. aSsinbceeenthme puacthhoingteenreicsittyinodfeavsebloesptionsgmaimneertahlosdisof passivating asbestos to reduce any potential fibrogenic and carcinogenic effects on those exposed to it without adequate precaution. Existing methodology for studying the in vivo fibrogenic effects of asbestos involves direct inhalation or ianntirmataralschareealeaxdammiinniesdtr,autsiounalolyf masobnetshtosslaftiebre,rfsotropaanthimolaolgs.icSaulbasnedquheisnttolych, ethmeiceaxlpeevriimdeennctaelloyftfriebarotesdis. Since the incubation period for asbestos-induced diseases is reported to be unusually long, experiments of this type are complicated, expensive and time consuming. HAosswoecviaetri,ornecJeonutrnwaol,rk36d,o7n3e4b-7y4R0.(R19. 7H5e)f)tisehr,oJwr.sathnadtPa.rJe.laGtieohnrsinhgip(AexmisetsricbaentwIneednustthreiailnHvyivgoiene mfiberaosguerneiociftyinoduf caesdbebsltooosdancedllitrsuipntuvrietrowhheemn foilbyetrics aarcetivagitiyt.atHedemwoitlhytaicsaucstpivenitsyi,oonrohfebmlooolydseisr,yitshraocytes. Numerous other authors have also made similar in vitro evaluations of a number of particulates. 21 of 29 4/10/2003 10:36 PM irwa. r w idow asbestos research program] ifnibvreongtieonnictopotetsetnthtieaelfsfectiveness of certain ZbJ* alleviating some ofthe health problems reportedly model h^as beWehnicehmrpelloiaybeldyianstsheesspersetsheent ****** " hemolytic activity. th^.surface of asbestos fibers and reduce its PHhaorisnpghtaotne,s,Ndaitsuordeiu2m14v5e2rs2e-3nS0!9P6o7]T,, ^ nS yi , d^ and aluminum (G. Macaicdna(EbDanTdAJ)., Ssi.mple Environmental Research 3 1-14 OOToTln^ " t P,!?m6r8<R1 Schnitzerand F. L. Pundsack, asbestos coated with pnlyvinylp^^ne^Nro^^mini^zes^rrisk ofasbestos^ ^ c^sc*oses dtat adhere to r " afifect the useful commercial properties o f T a s Z Z SUMMARY OF THE INVENTION Z "*b0"dfy fluidS "" >tda0" *wh0ich**h'e long m3,ena`Sshould not adversely siestas a 0" * ,east aPrti of ** ffeerr^occyayni^deddeepSoseitnedf'thhereon have n v^iiT'Z hf "u.n(1`.th3a8t8a6s8b81e1s,t6oseff*ib*e*rsTMwi*thaot flethasetmoneteaml etal fibers 3Ve tedUCed hemol^ c actlvl,y in comparison with untreated asbestos refers. y R mannumeral mParentheses following the metal to which it description of the preferred embodiment at " i o ^ f t PX " n' aSbeSU,S iS tteatedt0 dep08it 3t 16381 n ^ f-cyanide on spontaneously into ions of opposite electrical " eX 3" 3i0ni3^ lesa8^3111isdfe3f1in16e3d8a1s"a6sa8lutiwlabhli6chfdeis`s"ocOitaatles cwaadtmeri,ummecthojboallt, mhoZnfelns EZ Tfi rl idZ Ta f i j fE*xamPlfe"s f suit^able"fi3rsstumtoebtallecPaotilo3nrs are barisuumch, as (III) titanium (IV), zinc md forming a femWanide sal, Z a tT b Z e d ** " " Cs3tll(Vn6rS' w,inW(cIhI)3l1*6*"<W* . * ^ ' of 0 deposit a, leas, a c tio n ^ " wift a solution of ft. f !Ut10" f 11,6loniz3bl6 83,1^ metal, to F29 4/10/2003 10:37 PM [Fwd: FW: dow asbestos research program] psorelufetirorendomftehtehoiodnoizfacbolnetascatlitnfgorthaesausffbiecsietonst twimithe tthoealiloonwiztahbelesusarfltaciseboyf tshluerarysibnegsttohsefaibsberessttoosbien the contacted and wetted by the solution. The ionizable salt employed in the present process is preferably a chloride, a sulfate, a nitrate, or a msailxttoufrethtehefirresotfmoefttahl.eHaboowveevfeirr,satnmyestaallst.thMatowreilplrieofnerizaebliyn, sthoeluitoionniztaoblperosdalutcies aa cwaatitoernsoofluobnleeocfhtlhoeridfierst metals can be used in the present process. Furthermore, the ionizable salt can contain more than one type of cation and one type of anion. For example, a mixture of chloride salts of two first metals, or a mixture ofthe chloride and sulfate salts of the same first metal is suitable. The concentration of the solution of the ionizable salt employed in the present process is from about 1 ppearrctiecnutlabryfwirsetigmhettoalftshaelt.sFalotrtoexaabmouptlet,hwe choenncneinctkrealticohnlocorirdreeshpeoxnadhiyndgrtaoteaissatthueraiotendizsaoblluetisoanlto, tfhtehe caobnocuetn1trtaotiaobnooutft7h2epsearlcteinnttbhye waqeuigeohut.sPsroelfuetriaobnlya,tt2h0e.dceognrceeen.tCra.tiaonndo1fathtme osospluhteiroenporfetshseurieonisizfarobmle salt is from about 5 to about 10 percent by weight. Asudfvfiacnietangtetiomuselyto, tahlelomwixthtuerseooluftaiosbnetsotocsonantadctthaet lseaaltstsoalpuotirotinonca,nanbdepargeiftearteadblaytsruobosmtatnetmialpleyraaltluroeffthoer a awseblel-sktonsowfibneirnstuhrefaacret.s.TThheeseaignictalutidoenmofecthheanmicixalt,uraeir,ishaycdcroamulpiclioshremdabgyneutsiec omfeaagnistaftoiorninmduecainnsg agitation. Fsoollildo-wliiqnugidagsietpaatiroanti,otnheteacshbneisqtuoes sfiubcehrsasinvasocluuutmionficltarnatbioens.eTphaeraitoendizfraobmletshaeltf-itlrteraatteedbaysabneystsousitfaibbelers are tEhxeanmcpolnetsacotfedsuwitiatbhlea sseocluotnidonm, eptraelfecraatbiolynsaanraeqsuoedoiuums s,oplouttaiosnsi,uomf aorfearrmocixytaunriedethseareltoof.fVa asreicoounsdsmuietatabll.e techniques for contacting the salt-treated asbestos fibers with the ferrocyanide solution can be used as ifnedrrioccayteadnipdreevsiooluustiloyn. .HTohweesvaelrt-,tirteaistepdreafsebrreesdtotsofsibluerrrsyatrheemsaalitn-ttareinaeteddinascboensttaocstfwibiethrsthweitfhertrhoecyanide ssoolluuttiioonn tfoorcaonstuafcftictiheentsatilmt-teretoateadlloawsbaetstloesasatnadproeratciot nw,iathndthpereiofenriazbalbylesusablsttathnetiraelolyn atollftohremfearrmoceytaalnide ferrocyanide compound wherein the cation of said compound is originally the cation of the first metal associated with the ionizable salt. Tcohnecfeenrtrroactyioannicdoerrseoslpuotinodninhgastoaacosnatcuernattreadtiosonluotfiofrnoomf tahbeoufetr1ropceyracneindteboyfwtheeigshetctoondabmouettatlh.eFor example, when sodium ferrocyanide is employed, the concentration ofthe salt in an aqueous solution at 2o0f .tdheegsreece.onCd.,m1eattaml. oPsrpehfeerraebplyre,stshueref,erirsofcryoamniadbeosuotlu1ttioonabhoaus ta3c2opnecrecnetnrattbioynwoefigfrhotmo fatbhoeufte1rrtoocyabanoiudte 10 percent by weight of the second metal ferrocyanide. The asfiestos-ferrocyanide solution slurry is preferably agitated at about room temperature for a sufficient time to insure contact between the asbestos fibers and the solution. Fsoollildo-wliiqnugidagsietpaatiroanti,otnheteacshbneisqtuoes,fsiubcehrsaisnvsaocluuutimonfailrterasteiopna.raPtreedfefrroabmlyththeefiflitlrtaetreedbyasabneystsousitfaibbleers are subsequently washed with a suitable solvent, such as deionized water, to remove any non-adherent 23 of 29 4/10/2003 10:38 PM [Fwd: FW: dow asbestos research program] dferryrioncgy,ahneiadteincgo,mvpacouuunmd. aTnhdetahsebleiksteo.s fibers can then be dried by any suitable techniques, such as air tfreerarotecdyaansibdeestoofsawt liethasat soonleutfiiorsntomfeataflerHrocnyLanidetusalt ,er ^ Sub,Sequently contacting the thus 6aSt 0ne second metal to form a coating of a For example, if ? n0t limited * - l- n c e . ik ' solution, of ferrocyanide of at least one second metal it is desirable to have another metal ferrncranld o' It C V'?tb a f0*L,t'on' preferably an aqueous exampe sodlum or potassium ferrocyanide. If siestas, tie first metal, to deposit onTM ^ 2 ! frL ^ 7 T S**lu, tSle0CnOnfd3m,1eimonliszaalbtsle salt o f at the least one mends are'droseL t'C e ^ S T S s I r " " f ' water. One suitable de^ifion n aS6eSt0Sty ^fa a HqUCid nmtaeCdtiiTMn* '11s1u6cshur3f5a wFiartsetrm, septaral yfeinrrgotchyeasnuidspesenwshioicnhocnatno tbhee surfacefofrthae * 1 fibeirs'^301T1rem0TMmeU8dt,hfcerwroactyera"biydedrinying, the suspending medium ^ 3pphed " thls mannertadude those thatare insoluble in I ^ k & g ' e s S t 13o f ^ r iT nrhme,h0dnSch3racterized 33 lh>8 a fibrous asbestos material dcaeppaobslieteodfofnoramt ilneagsat afeproortTMionMofettfe 1 ? T 2 * l l S"t,tahb/l6e?f*irstnme etols "todsuecdoen"d mXe">taeltaflercraoteioynanide (II), iren (I,,), le S m ^ Z " ' 2 * mr T T r j l ' f TM '" " " b3"' TM emmicprloony,eadn. d a diameter of at least aboUutt 0ft0011 mm'lcerron' Hrrow^eveer' otherafifbil*61*lelnenggthths aonfdatdlieaamstetaebrosucta0n.5be of the asbestos fiber The individual fibers are e " * cating on dre &a e COatmg ls ^ue to the Saline outer surface s - s^S5S" - r , on die interiorh y d r ^ l t f " Z ""P"8"3* "* mterirSCrollsf 1"*>A and deposit The metal ferrocyanide that is deposited on the asbestos is preferably present in an amount of from about of 29 4/10/2003 10:39 PM