Document xrZ99NpaZgMx5M78B6RpK2LQ

--- AL226--/80/ : ME 277 225 220p. +> 22c et 0. = a ce E o 1G L David G. Lynch C | I 0li 0I A0 E Ie Economics, Exposure and Technology Division Office of Pollution Prevention and Toxics 7U.4S0.6EMnvironmental Protection Agency W1a2s0h0iPnegntnosny,lvD.aCn.ia20A4ve6n0ue, N.W. ASAHI GLASS CO., LTD July 9. 2004 = S< 2x 5 38 E - R oo Re: 1. An opinion about some peaks detected on the GPC chromatogim of 2. ACshaahria'cstePruirziafiteidonPooflytmheerpolymeric product Dear Mr. Lynch: As a follow up to recent discussions concerning the oligomeric component cofonsteavienrianlgpienakosurdeptureicftieeddopnoltyhmeeGr,PCI wcohurlodmalitkoegtroaemxporfeosusropuurriofpiiendipoonloynmetrh.eIinssue addition, I submit CBI and non-CBI versionof characterization reports of our telomer based polymeric product that used to prepare the purified polymer. ApcocloyrmdeirnbgytoAstahheipaGglaes5s'ofwethhearveeposrutb"mPiutrtiefdicoatniMonaayn7d,chGarPaCctcerhirzoamtaiotnogorfpaumrsifoifed purified polymer and corresponding product (Fig. 3), have several peaks between 18 and 20 minute. Our opinion is that these peaks are not oligomers in the purified polymer but "system (ghost) peaks", which is always attended with the GPC chromatogram. Asa result of the exhaustive elimination of PFOA and C8 precursors through the S1opxhplmeta'sndexCtr8apcrteiocnurasnodrsualrtreatsoon3i0cpsoplmveonrtdeexrtirnacatlli.onS,iPmuFlOtAaniesoruesdluycweidthtotlheess than elimination of C8 precursors (Mw: ca. 500) through these processes, most pprreospeonrtt,ioanrseopfrtehseudmiemdertoobreterliimmeirna(tMewd:. ca. 1500) containing fluoroacrylates, if cIfoomlpiagroemdertsowCe8reprreceumrasionresd, tihnattheisptuhreifoireddeproolfysmuebr%1,00ittiismsetisllladirfgfeircuilnt atomooubtnatin their distinct peak by GPC. Tahsetrheefo"rsey,sttheemp(egahoksst)mpaeyaknso"t cbaeuassesdibgnyeGdPtoCoslyigsotmeemrast.icThseousrecpeesaukcshaarsetchoensidered difference in dissolved gas (nitrogen, oxygen, carbon dioxide, water) or the amount oafttaenntdioexdiwdiatnht tihneTcHhFrombaettowegernamsaomfpGlPe Cso,lut_,ion__ and mobile phase, which is always / bMeoltewceuelnar10w-e1i7ghmtinduitsetsriobunttiohne ocfhtrhoemaptuorgifriaemd.poTlhyemreerisisaessmtailmlatneedgattoibvee spheoakwnat w1e7i.g1h5tm.iTnhuutse,s,thwehidcishtrciobrurteisopnoinsdptroe2s,u6m2e4dDtao bbye PlaMrgMerAtehqauniv3a,l0e0n0tDma.olecular Furthermore, since this polymer typical emulsion polymerization is manufactured by random condition, molecular weight copolymerization distribution is in a expected to be monomodal. This are not assigned to oligomers. supports the estimation that 18-20 minute peaks bTyhoouthgehrimteitshvoerdys dtihfafincuGlPt Cto,coonnefiprrmoptohseitcioonnteisnttoofselpoawramtoelelcouwlamrolweeciuglhatrcwoemipgohntent `material corresponding chromatography. to elution time of 18-20 minute by preparative Meanwhile, in compliance with characterization of our telomer the request of information regarding based polymeric product that used to the prepare the purified polymer, I submit CBI and non-CBI version of the reports. Please direct any questions about this opinion to me at your convenience. Sincerely yours, To Lermnnd `Tsuguhide Isemura Senior Manager Analytical Technology Group Quality Assurance Office Chemicals Company, Asahi Glass Co., Ltd. 10, Goikaigan, Ichihara-shi, Chiba 290-8566 Japan Phone: +81-436-23-3183 Fax: +81-436-23-3126 E-mail tsuguhide-isemura@agc.cjop K