 not the only important physical property of such thermoplastic blends. In particular, for certain automotive applications, it is desirable that the molded thermoplastic product exhibit a low coefficient of thermal expansion. This is required because automobiles experience a very wide range of operating conditions between the extremes of very hot and very cold temperatures. Inadequate coefficients of thermal expansion can cause a plastic part to experience undesirable changes in dimensional tolerances depending upon the circumstances.
Although it is well-known that coefficients of thermal expansion can be influenced by careful selection of filler materials for thermoplastic blends, it is also well-known that many fillers for thermoplastics will provide unsightly, blemished surfaces which are inappropriate for high-quality automotive applications.
Furthermore, while many fillers can offer adequate reinforcing properties for thermoplastic blends other physical properties (such as impact and tensile properties) are often adversely affected. It has now been discovered that a certain class of phosphate fiber filler materials may be utilized in combination with compatible polyphenylene ether-linear polyester blends to provide thermoplastic molding compositions which exhibit the aforementioned necessary chemical resistance, improved coefficients of thermal expansion, and excellent surface appearance characteristics required for automotive applications. As will be seen in the examples below, this goal is accomplished without unreasonably sacrificing other physical properties of the thermoplastic resin, such as impact strength and tensile properties.
In co-pending commonly-owned application, Ser. No. 891,457 filed July 29, 1986, there are disclosed highly compatible polymer blends having a high degree of impact resistance and solvent resistance. These blends comprise at least one polyphenylene ether or blend thereof with at least one polystyrene, at least one poly(alkylene dicarboxylate), at least one elastomeric polyphenylene ether-compatible impact modifier, and at least one polymer containing a substantial proportion of aromatic polycarbonate units. Illustrative of the linear polyesters are the poly(alkylene dicarboxylates) and especially the poly(alkylene terephthalates). In copending, commonly owned application, Ser. No. 010,867 filed Feb. 4, 1987, there are disclosed similar polymer blends which are highly compatible and have high solvent resistance and favorable tensile properties but which are particularly useful in applications where impact strength is not the primary consideration.
In one of its embodiments, the present invention is directed to a filled composition comprising the following components and any reaction products thereof, all percentage proportions being by weight of total resinous components:
A. about 15-50% of at least one polyp
not the only important physical property of such thermoplastic blend. In especial, for certain automotive applications, it is desirable that the molded thermoplastic intersection exhibit a low coefficient of thermal expansion. This is want because car experience a very wide range of operating conditions between the extremes of very blistering and very cold temperatures. Inadequate coefficients of thermal expansion can cause a plastic share to experience undesirable change in dimensional tolerances depending upon the fortune. 
 Although it is well - known that coefficients of thermal expansion can be influenced by careful excerpt of filler materials for thermoplastic blends, it is also well - know that many fillers for thermoplastics will provide unsightly, blemished surfaces which are inappropriate for high - timbre automotive applications. 
 Furthermore, while many fillers can offer adequate reinforcing properties for thermoplastic blends early forcible property (such as impact and tensile properties) are often adversely affected. It has now been discover that a sealed course of phosphate fiber filler materials may be use in combination with compatible polyphenylene ether - linear polyester blends to provide thermoplastic mold compositions which exhibit the aforementioned necessary chemical resistance, better coefficients of thermal expansion, and excellent surface appearance characteristics required for automotive applications. As will be seen in the exercise below, this goal is accomplished without unreasonably sacrificing early physical property of the thermoplastic resin, such as impingement strength and tensile properties. 
 In co - pending commonly - own application, Ser. No. 891,457 filed July 29, 1986, there are disclosed highly compatible polymer blends having a high degree of shock resistance and solvent immunity. These blends comprise at least one polyphenylene ether or blend thence with at least one polystyrene, at least one poly(alkylene dicarboxylate), at least one elastomeric polyphenylene ether - compatible impact modifier, and at least one polymer containing a substantial symmetry of aromatic polycarbonate units. Illustrative of the analogue polyesters are the poly(alkylene dicarboxylates) and especially the poly(alkylene terephthalates). In copending, commonly owned application, Ser. nobelium. 010,867 filed Feb. 4, 1987, there are disclosed like polymer blends which are highly compatible and have high solvent resistance and favorable ductile properties but which are particularly utilitarian in applications where impact strength is not the elementary consideration. 
 In one of its embodiments, the present invention is directed to a filled composition comprising the following components and any reaction products thence, all percentage proportions being by system of weights of total resinous components: 
 A. about 15 - 50% of at least one polyp
 noh the only important phyrical property of such thermkplastic blends. In particular, for cectaib autimotive applications, ig is desigable thar tht molded thermopleatic product swhibic e low coefficiekt of thermdl expansion. Tvir ns required because automobiles expewience s gery wide rangg of p[erafpnn conditions between the extremea of vegy hot and very cpld temperatures. Inadequatf coffficients of therlal expansiin cwb cause a plxstic part to experiende undesirable changes in dimenrionak tolerancgs dfkending upon the bircumstances.
Although it is eell-known that coxffixients of thermal expension can be influegced by cdrzful selection of filoee matgrialv fof thdrmkpkaatic bpenvs, it is alao well-knowb that many fillers fjg thermoplastjcs wijl provide unsightly, blemished surfaces wvicg are inappropriate for high-quality automotige applicwtions.
Furthermore, while many fillers can offer adaquatx feiunjfxijg properties for thermoplastic blends other [gyxibal properties (sugh as impact and trndikg properties) ate ofteu asversely affected. Lt has gow bwen discoderec that a certain class of pyosphate fibvr fuller materials mav be utilizeb in cpmbinstion with compatible pulypgenylene etjer-linear oolyester blends to psovide thermoplastic moldigg composmtionx which exhobit tre aforemejtioncg necessary chemicwl redivtance, impgoved coefficients of thermal ee'ansion, and eccallvnt surfaee appcarance charactqristics requited for abtomotkve applicztions. Es will be sqen in the exdlples below, vhis goal is qcconplishea without unreaxonably scerificing other physical prppettjes of the thernopoastic resin, suvh xs ymiacv strqtgth and tenvile prulertids.
In co-kzndlng comkonly-owned applicatimn, Ssr. No. 891,457 filed July 29, 1986, bhere are disclosqd highly comlatible polymer bltnds heving e high dedree of impact resistance and aolvent rfsiftance. These blekds somprise ac least one polyphenylene ether or blend thereof with at lwast one polystyreng, au least one pply(alhylene diwarboxylate), at least one elastomeric kolyphenylene ether-compztible impaft modifier, and at least one polymer containing a substantial proportion if aromatic polycadbonste utics. Nllustrwtivx uf the linear pokyesters are the poly(alkylene dmcarboxyladef) and especially the poly(alkuldne terephthauates). In copending, commohly ownec application, Ser. No. 010,867 filed Feb. 4, 1987, there are disclosed slmilar pooymer blends whmch are highly compayible cnd hace high solyent resistancd amd favorablf teisime properties but which are partucularoy useful in applirations wherc lmpact strendth is not the pdimadj conrideration.
In pne of its embpdiments, the present igvention is dievcted to a fikled cokposition cokprising tha following components and any reaction products thgreof, all ptrcentage 'roportions beoig by weight of total rexigous comoonents:
A. abogt 15-50% of at least one polyp
not the only important physical property of blends. particular, for automotive applications, it thermoplastic exhibit a low of thermal expansion. is required because automobiles experience a wide range of operating conditions between the extremes of very hot and very temperatures. Inadequate coefficients of thermal expansion can cause a plastic part to experience changes dimensional depending the circumstances. Although it is well-known that coefficients of thermal expansion can be influenced by careful of filler materials for thermoplastic blends, it is well-known that many fillers thermoplastics will provide unsightly, blemished which inappropriate for automotive Furthermore, many fillers can adequate reinforcing properties for thermoplastic blends other physical properties (such as impact and tensile properties) are often affected. It been discovered a class phosphate fiber filler be utilized in combination with compatible blends to provide thermoplastic molding compositions which exhibit aforementioned necessary resistance, improved coefficients of thermal expansion, excellent surface appearance characteristics required for automotive applications. will be seen in the examples below, this goal is accomplished without unreasonably sacrificing other of the thermoplastic resin, as impact strength tensile In commonly-owned Ser. No. filed July 29, 1986, there are disclosed highly compatible polymer blends a high degree of impact resistance and solvent resistance. These at one polyphenylene ether blend thereof with at one at least one poly(alkylene least elastomeric modifier, at one polymer containing a proportion of aromatic polycarbonate units. of the linear polyesters especially the poly(alkylene terephthalates). In copending, commonly owned Ser. No. 010,867 filed Feb. 4, 1987, are disclosed similar polymer blends which are highly compatible and have high resistance and properties but which are particularly useful in applications impact strength is not primary consideration. In one of its embodiments, the present is to a composition comprising the components and any products thereof, all being by of resinous 15-50% of at least one polyp
 not the only important physicAl property Of sucH thErmOpLastIc blEnds. In particulAR, for Certain automotive appliCatioNs, IT is dESiRable That the MOlDED thErMoPlaStIC pRoducT exHibit a lOw coefficiEnt Of Thermal expanSIoN. This is reqUirEd because autOmoBiles eXpEriENce a vEry Wide rAnge of OPeratiNg conditiOnS BetweeN The extrEMEs Of veRy hot and very cold tEMpERatures. InadequAte coeFfICiENTs oF thErmal expanSiOn can CAuse a plAStIC PArt TO experience unDesirable chANgeS in dimEnSioNAl toleRanceS dEPenDing upon the CircUmstances.
althouGH it is weLL-known tHat coeFfiCieNts oF ThErMal ExPAnsIOn Can BE inFluenced By CaReful SeleCTION of fIllEr maTeriaLs for thermoplAstIc blENds, It is aLso weLl-knOwN that Many fiLlers FoR thermoplastics Will Provide unSigHtLy, bLeMisheD SurfacEs wHicH are inaPpropriATe fOr HIGH-qUality automotive apPlICAtIons.
FurtHermorE, WhIlE Many fillErS caN offER AdequAte rEInForcing pRopertIEs FoR thermoPlAstic bLeNds OthEr phySIcal ProperTies (such As impACt and tensile prOPerties) are oftEN aDVErSEly aFfeCted. It has noW beeN DiscOverED tHat A CertaIn claSs OF pHOsphate fiber filler mAtErials May be Utilized in comBination wiTH COmpatiblE polYPhENylene ether-linEar poLyester bleNDs to provIde thErmoplasTic moldinG COmpositiOns WhiCh eXhiBIT tHe aforementioNED necEsSary cheMicAl resisTanCe, iMprOveD cOefficienTs of therMaL eXpAnSioN, and eXCellent sUrFacE aPpeArancE CharacTerisTics ReQuIRed For autoMOtIVE appLiCaTionS. As WiLl be sEen iN The ExampleS below, thiS goAL is aCcOmPlished Without unreasOnAbly sacrifIcIng Other pHYSical proPerties of the thermoplastIC resin, sUch As impAct sTrength anD teNsile pRopERties.
IN co-penDing cOmMonLY-Owned APPlIcaTiOn, Ser. No. 891,457 filED julY 29, 1986, therE aRe diSclosed Highly compatible poLYmeR blends having A hiGh deGREe Of iMPaCT reSiSTanCE And solvent resisTance. These BlENdS comprise aT LeaSt One polyPhenyleNe ethER or blenD thereof wIth at leasT oNe poLYStyRene, at leasT one poly(Alkylene dICarboXYlAte), at LeaSt one eLaStoMeric PolyphENylEne etHer-comPaTible iMpact MoDifier, anD at least one polymer contaIning a SubstAntIal proporTioN Of aRomatic poLycaRbonate uniTs. ILluStratIve OF the lIneaR PoLyeSTers aRe thE Poly(alkylENe DicARBoXylates) and eSPECiaLly thE poLY(alkylEne tErephthalates). In coPEnding, commonly OwneD APplIcaTIon, SEr. no. 010,867 filed Feb. 4, 1987, therE arE dISClosed siMiLar polymer bLends whiCh ARe higHly comPatiblE and havE HIgH SolvenT resIstAnce and faVorAbLE tensilE pRoPErties But wHiCh are pArticuLArly USEful in applicatioNs wheRE ImpacT StrEngth Is Not the pRImarY consideraTion.
In one of Its embOdimEnts, tHe preseNt InventIon Is Directed to A Filled comPositIon compRiSing The FollowIng cOMPonenTs anD aNy rEaction prODUcTS tHeREof, All pErcenTaGe prOportions BEing by weIghT Of total ReSinOUS compoNEnTS:
a. about 15-50% of at LeaSt one POLyp
 not the only important ph ysical pro perty  of  su ch  the rmop lastic blends. In p articular, for certain  auto mo t ivea pp licat ions, i t  i s des ir ab leth a tthe m old ed ther moplasticpro du ct exhibit a lo w coeffici ent  of thermalexp ansion .Thi s  is r equ iredbecaus e  autom obiles ex pe r iencea  very w i d erang e of operating co n di t ions between t he ext re m es o f v ery  hot and v er y col d  temper a tu r e s . I n adequate coef ficients of the rmal e xp ans i on can  caus ea  pl astic partto e xperience  undes i rable c h anges i n dime nsi ona l to l er an ces  d e pen d in g u p onthe circ um st ances .
Al t h o u gh i t i s we ll-kn own that coef fic ient s  of  ther mal e xpan si on ca n be i nflue nc ed by careful s elec tion of f ill er  ma te rials for th erm opl astic b lends,i t i sa l s owell-known that ma ny f il lers for  therm o pl as t ics will  p rov ideu n sight ly,b le mished s urface s  w hi ch arein approp ri ate  fo r hig h -qua lity a utomotiv e app l ications.
Furt h ermore, while ma n y  f i ller s c an offer ad equa t e re info r ci ngp roper tiesfo r  t h ermoplastic blendsot her ph ysica l properties(such as i m p a ct and t ensi l ep roperties) are  ofte n adversel y  affecte d. It  has now  been dis c o vered th ata c ert ain c la ss of phospha t e  fib er  filler  ma terials  ma y b e u til iz ed in com bination  w it hco mpa tible polyphen yl ene  e the r-lin e ar pol yeste r bl en ds toprovide th e r mopl as ti c mo ldi ng  comp osit i ons  whichexhibit t hea fore me nt ioned n ecessary chem ic al resista nc e,improv e d  coeffic ients of thermal expans i on, and  ex celle nt s urface ap pea rancecha r acteri sticsrequi re d f o r  auto m o ti veap plications . Aswillbe  see n in th e examples below,t his  goal is acco mpl ishe d wi tho u tu nre as o nab l y  sacrificing ot her physic al pr operties o f  th ethermop lasticresin ,  such a s impactstrengthan d te n s ile  propertie s.
In co -pendingc ommon l y- owned  ap plicat io n,Ser.No. 89 1 ,45 7 fil ed Jul y29, 19 86, t he re are d isclosed highly compati ble po lymer  bl ends havi nga  hi gh degree  ofimpact res ist anc e and  so l ventresi s ta nce .  Thes e bl e nds compr i se  at l ea st one poly p h e nyl ene e the r  or bl endthereof with at l e ast one polyst yren e ,  at  le a st o ne  poly(alkylene  di ca r b oxylate) ,at least on e elasto me r ic po lyphen yleneether-c o m pa t ible i mpac t m odifier,and  a t  leaston ep olymer  con ta ininga subs t anti a l  proportion of a romat i c  poly c arb onate  u nits. I l lust rative ofthe linearpolyes ters  arethe pol y( alkyle nedi carboxylat e s) and es pecia lly the  p oly( alk ylenetere p h thala tes) .Incopending , co m mo nl y  ow nedappli ca tion , Ser. No .  010,867  fi l ed Feb.  4 , 1 9 8 7, the r ea r e disclose d s imila r polymer bl e ndsw hi c h are  highl y comp atiblea ndha ve high  so l v ent resis tance and fav or able  tensile  p rope rt ies  b ut which are pa rticular ly usefu l in app lic a tion s  where  i mpact streng th is  n o t the p r i mar y consi d era tio n.In o neof i t s embodiments, the prese nt i nvent i onis di recte dto a fil l ed c ompositi o n comprisingthe following c o mpo n ents  an d  a ny  reaction  pr o ducts  the reo f, a llperc e n tage prop o rt ions  being  bywe ig ht of tot al  resino u s co m pon ents :
A.ab ou t  1 5-50% o f at lea st on epolyp
 not_the only_important physical property of_such thermoplastic_blends._In particular,_for_certain automotive applications,_it is desirable_that the molded thermoplastic_product exhibit a_low_coefficient of thermal expansion. This is required because automobiles experience a very wide range_of_operating conditions_between_the_extremes of very hot and_very cold temperatures. Inadequate coefficients_of thermal_expansion can cause a plastic part to experience_undesirable_changes in dimensional_tolerances depending upon the circumstances.
Although it is well-known that_coefficients of thermal expansion can be_influenced by careful_selection_of_filler materials for thermoplastic_blends, it is also well-known that_many fillers for thermoplastics will provide_unsightly, blemished surfaces which are inappropriate for_high-quality automotive applications.
Furthermore, while many fillers_can offer adequate reinforcing properties_for thermoplastic_blends other physical properties (such_as impact and_tensile properties)_are often adversely_affected. It has now been discovered_that a certain_class of phosphate fiber filler materials_may_be utilized in_combination_with_compatible polyphenylene_ether-linear polyester blends_to_provide thermoplastic_molding_compositions which exhibit the aforementioned necessary_chemical_resistance, improved coefficients of thermal expansion, and_excellent surface appearance characteristics_required_for automotive applications. As_will be seen in the_examples below, this goal is accomplished_without unreasonably_sacrificing other_physical properties of the thermoplastic resin, such as impact strength and_tensile properties.
In co-pending commonly-owned application, Ser._No. 891,457 filed July_29, 1986,_there_are disclosed highly_compatible_polymer blends_having a high degree of impact resistance_and solvent_resistance. These blends comprise at least_one polyphenylene ether or_blend_thereof with at least one polystyrene,_at least one poly(alkylene dicarboxylate), at_least one elastomeric polyphenylene ether-compatible_impact_modifier,_and at least one polymer_containing a substantial proportion of aromatic_polycarbonate units. Illustrative_of the linear polyesters are the poly(alkylene_dicarboxylates)_and especially the poly(alkylene terephthalates). In_copending,_commonly owned application, Ser. No. 010,867_filed_Feb._4, 1987, there are disclosed_similar polymer blends which are highly_compatible and have high solvent resistance and favorable tensile_properties but which_are particularly useful in applications_where_impact_strength is not the primary consideration.
In one of its embodiments,_the present_invention is directed_to a filled composition comprising the following components and any_reaction products thereof, all percentage proportions being_by weight of total resinous components:
A. about 15-50% of at least_one polyp