ography, high quality paper or medium quality paper, in addition to problems such as image penetration to the rear surface and feathering due to penetration, curling and cockling of images recorded on plain paper result in major problems.
In order to overcome the above drawbacks, an ink-jet recording method is disclosed (refer, for example, to Patent Document 4) which employs a penetration-improved ink by specifying the wetting time and the absorption coefficient of recording materials in the Bristow method. However, since colorants in the ink simultaneously penetrate into plain paper, this method results in problems, in which a decrease in image density as well as penetration to the rear surface is enhanced, resulting in unsuitability for both sided printing.
Further, ink-jet ink is disclosed (refer, for example, to Patent Document 5) which incorporates specified amide compounds, pyridine derivatives, imidazoline compounds or urea compounds as an anticurl agent. However, this method results in problems in which clogging of the nozzle of a recording head tend to occur due to drying of liquid ink.
Still further, proposed is an ink-jet recording method to minimize the above curling (refer, for example, to Patent Document 6), in which curling balance is optimized by providing a solution containing water on the side opposite the image printing surface. However, this method results in problems in which along with an increase in the adhered amount of ink as well as curl balance liquid onto plain paper, its strength is deteriorated, whereby jamming tends to occur during conveyance.
Still further, instead of using the water-based ink-jet ink, a solvent-based ink capable of achieving printing at a high rate has been studied. Namely, by employing an oil-based ink (being a solvent-based ink-jet ink), even though printed on plain paper, it is possible to achieve high speed printing due to quick penetration into recording materials, shorter drying time, and no curling of recording materials. However, problems occur in which text is not reproduced as desired and penetration to the rear surface results due to the fact that the solvent based ink easily penetrates plain paper.                (Patent Document 1) Japanese Patent Publication Open to Public Inspection (hereinafter referred to as JP-A) No. 11-172174        (Patent Document 2) JP-A No. 2000-95983        (Patent Document 3) JP-A No. 2000-239591        (Patent Document 4) JP-A
ography, high quality paper or medium timbre newspaper, in addition to problems such as prototype penetration to the rear airfoil and feathering due to penetration, curling and cockling of trope recorded on plain composition result in major problems. 
 In club to overcome the above drawbacks, an ink - fountain recording method acting is disclosed (refer, for example, to Patent Document 4) which use a penetration - improved ink by specifying the wet time and the absorption coefficient of recording materials in the Bristow method acting. However, since colorants in the ink simultaneously penetrate into plain composition, this method result in problems, in which a decrease in image density as well as penetration to the rear surface is enhance, resulting in unsuitability for both sided printing. 
 Further, ink - jet ink is disclosed (refer, for example, to Patent Document 5) which incorporates specified amide compounds, pyridine derivatives, imidazoline compounds or urea compounds as an anticurl agent. However, this method results in problems in which clogging of the nozzle of a record head tend to occur ascribable to dry of fluid ink. 
 Still further, proposed is an ink - jet recording method to minimize the above curling (refer, for example, to Patent Document 6), in which curl balance is optimized by providing a solution containing water system on the side opposite the image printing surface. However, this method acting results in problem in which along with an increase in the adhered amount of ink as well as curl balance liquid onto plain newspaper, its strength is deteriorated, whereby jamming tends to happen during conveyance. 
 even further, instead of use the water - base ink - jet ink, a solvent - establish ink capable of achieve printing at a high rate has been studied. Namely, by hire an oil - based ink (being a solvent - based ink - jet ink), even though print on plain paper, it is possible to achieve high speed printing due to quick penetration into recording materials, short drying time, and no curling of recording material. However, problems occur in which text is not reproduced as desired and penetration to the rear surface resultant role due to the fact that the solvent based ink easily penetrates plain paper.                 (Patent Document 1) Japanese Patent Publication Open to Public Inspection (hereinafter mention to as JP - A) nobelium. 11 - 172174         (Patent Document 2) JP - A No. 2000 - 95983         (Patent Document 3) JP - A No. 2000 - 239591         (Patent Document 4) JP - A
ogrwphy, high quality paper ur medium qualijy paper, in adsition tu problems such as image penxtrarion uj the rear surface and featjering dye ti penetration, curliky and gocklnnj of images recprded on pnain paper resglg nn major problems.
In order to overcomq the anoge drawbacks, ag inl-tet dvcirding method is disclosed (rerer, for example, to Pstent Document 4) which empllys w penetration-improged ink by wpecydying the wegting time and the abskrption coefficient of recordine matzrials in tye Brlvtow method. Howener, since colorants it the imk simultaneouxly pebetrate into plain pa'er, this method resujts in prmbmems, in which a dwceease in hmagd devsiuy es sell ad pxnetration fo the rear surface is enhancec, wvxulting in uhsuitafijity for both sided printing.
Further, ink-bet ink is disclosed (refer, for example, to Patenj Document 5) which incorporates specified amide compounds, pysidinx aernywguvfs, imidazoline compounds or urea compounds as zn akticurl agent. Hocever, this methoc gexolts in probleos in cgidh clogging of the nozzle of a recordind hesd tend to occur due to dryung of liquib ibk.
Still further, prlposed is au ink-jgt recprding method to minimive the above curllng (refer, wor example, to Pxtekt Gocument 6), in which curling balance ms opcimized cy ptovidind a solutiln cokdaining water on tje sibe op[osite the image printing surface. However, this method rgsunts in probjems ln which along rith an increaxe in tke adhdred amounn of ink es well as ctrl balance lheuid onto plein paper, its strwngth ir deteriorated, ehereby jcimint tends to occur dmring donveyance.
Still futrher, instead og urind nhe wwder-based ink-bet knk, s solxent-bastb ikk zapanle of achieving prittinf at a high rate hss been stodied. Namqly, by employong an oil-based inn (beiig a sulveny-bafed ink-jet ink), even though prihted on ppaik paper, it is poswible to achneve high speed printing due to quick peietration into recordint materials, shorter crying time, and go curlinc of recording materuals. However, probkems occur in which tsxt is not geproduced as desired and penetration to the rear surface results due to rhe fart that the sklvemt baveb iuk easijy pxnxtrates plain papvr.                (Patent Documenv 1) Japanesa 'atent Publication Open to Punlkc Inspection (hereinafter referred to as JP-A) Mo. 11-172174        (Patent Document 2) JP-A No. 2000-95983        (Patent Documcnt 3) JP-A Bo. 2000-239591        (Iztxnt Document 4) JP-A
ography, high quality paper or medium quality addition problems such image penetration to due penetration, curling and of images recorded plain paper result in major problems. order to overcome the above drawbacks, an ink-jet recording method is disclosed (refer, example, to Patent Document 4) which employs a penetration-improved ink by specifying the time the coefficient recording materials in the Bristow method. However, since colorants in the ink simultaneously penetrate into plain this method results in problems, in which a in image density as as penetration to the rear is resulting in for sided Further, ink-jet ink disclosed (refer, for example, to Patent Document 5) which incorporates specified amide compounds, pyridine derivatives, imidazoline compounds urea compounds anticurl agent. this results problems in which the nozzle of a recording head due to drying of liquid ink. Still further, is an recording method to minimize the above (refer, for example, to Patent Document 6), in curling balance is optimized by providing a solution containing water on the side opposite the surface. However, this method in problems in along an in adhered amount ink as well as curl balance liquid onto plain paper, its is deteriorated, whereby jamming tends to occur during conveyance. Still of the water-based ink-jet a solvent-based ink capable achieving at a high rate studied. by ink a ink-jet ink), even though on plain paper, it is to achieve high speed into recording materials, shorter drying time, and no of recording materials. However, problems occur in text is not reproduced as desired and penetration to the rear surface due to that the solvent based ink easily penetrates plain (Patent Document 1) Japanese Publication Open to Public Inspection (hereinafter referred to as No. (Patent Document JP-A No. 2000-95983 Document 3) JP-A 2000-239591 (Patent Document
ography, high quality paper or Medium qualIty paPer, In aDdItioN to pRoblems such as iMAge pEnetration to the rear surFace aNd FEathERiNg due To penetRAtION, cuRlInG anD cOCkLing oF imAges recOrded on plaIn pApEr result in maJOr Problems.
In OrdEr to overcome The Above dRaWbaCKs, an iNk-jEt recOrding MEthod iS discloseD (rEFer, for EXample, tO pAtEnt DOcument 4) which emploYS a PEnetration-imprOved inK bY SpECIfyIng The wetting TiMe and THe absorPTiON COefFIcient of recorDing materiaLS in The BriStOw mEThod. HoWever, SiNCe cOlorants in tHe inK simultanEously PEnetratE Into plaIn papeR, thIs mEthoD ReSuLts In PRobLEmS, in WHicH a decreaSe In Image DensITY AS welL as PeneTratiOn to the rear suRfaCe is ENhaNced, rEsultIng iN uNsuitAbilitY for bOtH sided printing.
FUrthEr, ink-jet iNk iS dIscLoSed (reFEr, for eXamPle, To PatenT DocumeNT 5) whIcH INCoRporates specified aMiDE CoMpounds, pYridinE DeRiVAtives, imIdAzoLine COMpounDs or UReA compounDs as an ANtIcUrl agenT. HOwever, ThIs mEthOd resULts iN problEms in whiCh cloGGing of the nozzlE Of a recording hEAd TENd TO occUr dUe to drying oF liqUId inK.
StiLL fUrtHEr, proPosed Is AN iNK-jet recording method To MinimiZe the Above curling (rEfer, for exaMPLE, to PatenT DocUMeNT 6), in which curlinG balaNce is optimIZed by proVidinG a solutiOn containING water on The SidE opPosITE tHe image printiNG SurfAcE. HoweveR, thIs methoD reSulTs iN prObLems in whiCh along wItH aN iNcReaSe in tHE adhered AmOunT oF inK as weLL as curL balaNce lIqUiD OntO plain pAPeR, ITs stReNgTh is DetErIoratEd, whERebY jamminG tends to oCcuR DuriNg CoNveyancE.
Still further, InStead of usiNg The Water-bASEd ink-jet Ink, a solvent-based ink capaBLe of achIevIng prIntiNg at a high RatE has beEn sTUdied. NAmely, bY emplOyIng AN Oil-baSED iNk (bEiNg a solvent-BASed Ink-jeT iNk), evEn thougH printed on plain papER, it Is possible to aChiEve hIGH sPeeD PrINtiNg DUe tO QUick penetration Into recordInG MaTerials, shoRTer DrYing timE, and no cUrlinG Of recorDing materIals. HowevEr, ProbLEMs oCcur in whicH text is nOt reproduCEd as dESiRed anD peNetratIoN to The reAr surfACe rEsultS due to ThE fact tHat thE sOlvent baSed ink easily penetrates pLain paPer.                (PaTenT Document 1) japANesE Patent PuBlicAtion Open tO PuBliC InspEctIOn (herEinaFTeR reFErred To as jp-A) No. 11-172174        (PatenT doCumENT 2) Jp-A No. 2000-95983        (Patent DOCUMenT 3) JP-A NO. 2000-239591        (PaTEnt DocUmenT 4) JP-A
ography, high quality pape r or mediu m qua lit y p ap er,in a ddition to pro b lems  such as image penetra tionto ther ea r sur face an d  f e a the ri ng  du et openet rat ion, cu rling andcoc kl ing of image s  r ecorded on  pl ain paper re sul t in m aj orp roble ms. 
In o rder t o  overc ome the a bo v e draw b acks, a n in k-je t recording metho d  i s  disclosed (re fer, f or ex a m ple , t o Patent D oc ument 4) whic h  e m p l oys a penetration -improved i n k b y spec if yin g  the w ettin gt ime  and the ab sorp tion coef ficien t  of rec o rding m ateria lsintheB ri st owme t hod .  H owe v er,  since c ol or antsin t h e i nk s imu ltan eousl y penetrate i nto  pla i n p aper,  this  met ho d res ults i n pro bl ems, in which a  dec rease inima ge  de ns ity a s  wellaspen etratio n to th e  re ar s u rf ace is enhanced, r es u l ti ng in un suitab i li ty for both  s ide d pr i n ting. 
Fur t he r, ink-j et ink is  d isclose d(refer ,for  ex ample ,  toPatent  Documen t 5)w hich incorpora t es specifieda mi d e  c o mpou nds , pyridinederi v ativ es,i mi daz o linecompo un d so r urea compounds as  a n anti curlagent. Howeve r, this me t h o d result s in pr o blems in which  clog ging of th e  nozzleof arecordin g head te n d  to occu r d uetodry i n gof liquid ink . Stil lfurther , p roposed  is  an  in k-j et  recordin g method  t omi ni miz e the above cu rl ing  ( ref er, f o r exam ple,to P at en t  Do cument6 ), i n wh ic hcurl ing  b alanc e is opt imizedby provid ing a so lu ti on cont aining wateron  the sideop pos ite th e image pr inting surface. However ,  this m eth od re sult s in prob lem s in w hic h  along  withan in cr eas e in th e ad her ed  amount of i nkas we ll  ascurl ba lance liquid ontop lai n paper, itsstr engt h is  de t er i ora te d , w h e reby jamming te nds to occ ur du ring conve y anc e. 
Stillfurther , ins t ead ofusing the  water-ba se d in k - jet  ink, a so lvent-ba sed ink c a pable of  achi evi ng pri nt ing  at a  highr ate  hasbeen s tu died.Namel y,  by empl oying an oil-based ink(being  a so lve nt-basedink - jet  ink), ev en t hough prin ted  on  plai n p a per,it i s  p oss i ble t o ac h ieve high sp eed p ri nting due t o q uic k pen etr a tion i ntorecording materia l s, shorter dry ingt i me,  an d  nocu rling of recor din gm a terials.  H owever, pro blems oc cu r  in w hich t ext is  not re p r od u ced as  des ire d and pen etr at i on to t he  r e ar sur face  r esults  due t o  the f act that the sol ventb a sed i n k e asily  p enetrat e s pl ain paper.                ( Pate nt Do cument1)  Japan ese  P atent Publ i cation Op en to  Public  I nspe cti on (he rein a f ter r efer re d t o as JP-A ) No .  1 1- 1 721 74      ( Pate nt Docume n t 2) JP- A N o . 2000- 95 983      ( Pa t e nt Documen t 3 ) JP- A No. 2000-2 3 9591      ( Patent  Docum ent 4)J P-A 
ography, high_quality paper_or medium quality paper,_in addition_to_problems such_as_image penetration to_the rear surface_and feathering due to_penetration, curling and_cockling_of images recorded on plain paper result in major problems.
In order to overcome the_above_drawbacks, an_ink-jet_recording_method is disclosed (refer, for_example, to Patent Document 4)_which employs_a penetration-improved ink by specifying the wetting time_and_the absorption coefficient_of recording materials in the Bristow method. However, since_colorants in the ink simultaneously penetrate_into plain paper,_this_method_results in problems, in_which a decrease in image density_as well as penetration to the_rear surface is enhanced, resulting in unsuitability_for both sided printing.
Further, ink-jet ink_is disclosed (refer, for example,_to Patent_Document 5) which incorporates specified_amide compounds, pyridine_derivatives, imidazoline_compounds or urea_compounds as an anticurl agent. However,_this method results_in problems in which clogging of_the_nozzle of a_recording_head_tend to_occur due to_drying_of liquid_ink.
Still_further, proposed is an ink-jet recording_method_to minimize the above curling (refer, for_example, to Patent Document_6),_in which curling balance_is optimized by providing a_solution containing water on the side_opposite the_image printing_surface. However, this method results in problems in which along with_an increase in the adhered amount_of ink as well_as curl_balance_liquid onto plain_paper,_its strength_is deteriorated, whereby jamming tends to occur_during conveyance.
Still_further, instead of using the water-based_ink-jet ink, a solvent-based_ink_capable of achieving printing at a_high rate has been studied. Namely,_by employing an oil-based ink_(being_a_solvent-based ink-jet ink), even though_printed on plain paper, it is_possible to achieve_high speed printing due to quick penetration_into_recording materials, shorter drying time, and_no_curling of recording materials. However, problems_occur_in_which text is not reproduced_as desired and penetration to the_rear surface results due to the fact that the_solvent based ink_easily penetrates plain paper. ___         _ _(Patent Document 1)_Japanese Patent Publication Open to Public Inspection (hereinafter referred to_as JP-A) No. 11-172174   _    (Patent Document 2) JP-A No. 2000-95983 _      (Patent Document_3) JP-A No. 2000-239591   _   _(Patent_Document 4) JP-A