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Topic: Dimethyl terephthalate

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	Transesterification - Wikipedia, the free encyclopedia
		Transesterification is used in the synthesis of polyester, in which diesters undergo transesterification with diols to form macromolecules.
		For example, dimethyl terephthalate and ethylene glycol react to form polyethylene terephthalate and methanol, which is evaporated to drive the reaction forward.
		The reverse reaction (methanolysis) is also an example of transesterification, and has been used to recycle polyesters into individual monomers (see plastic recycling).
	en.wikipedia.org /wiki/Transesterification (274 words)

	NTP: Abstract for TR-121 - Dimethyl Terephthalate
		Dimethyl terephthalate is one of the basic monomers used in the synthesis of polyester fibers.
		Groups of 50 rats of each sex and 50 mice of each sex were administered dimethyl terephthalate at one of two doses, either 2,500 or 5,000 ppm, for 103 weeks, then observed for 2 additional weeks.
		Administration of dimethyl terephthalate had no appreciable effect on the mean body weights of the rats and mice of either sex.
	ntp-server.niehs.nih.gov /index.cfm?objectid=070493F7-C07D-0035-DB50B70E70C3FB9B (362 words)

	Aromatic polyols made from alkylene glycols and waste streams from the manufacture of dimethyl terephthalate containing ...
		In this patent, a polyol mixture is prepared by the transesterification of a residue from the manufacture of dimethyl terephthalate (DMT) with a glycol, which is then used to produce polyisocyanurate foams having a combination of a high degree of fire resistance with low smoke evolution, low foam friability and high compressive strength.
		The preparation of such a polyol mixture (from ethylene glycol and dimethyl terephthalate esterified oxidate residue) is described in U.S. Pat.
		Dimethyl terephthalate may be present in amounts ranging from 6 to 60% of the DMT waste stream.
	xrint.com /patents/us/4444920 (4262 words)

	Code of Federal Regulations: 21 CFR 177.1630 -- Polyethylene phthalate polymers
		Ethylene terephthalate-isophthalate copolymers: Prepared by the condensation of dimethyl terephthalate or terephthalic acid and dimethyl isophthalate or isophthalic acid with ethylene glycol.
		Ethylene terephthalate polymer: Prepared by the condensation of dimethyl terephthalate and ethylene glycol.
		The modifier is used in polyethylene terephthalate at a level not to exceed 30 percent by weight of the polyethylene terephthalate.
	vm.cfsan.fda.gov /~lrd/cf177163.html (1605 words)

	Showcase
		We prepared the iso- and terephthalate diesters with C1-C4 alkyl chain groups, as well as the mixed butyl esters, where C1-C3 alkyl chain groups are on one ester group and butyl on the other.
		All other iso- and terephthalate esters studied were synthesized from the reaction between iso- or terephthaloyl chloride and an excess amount of the corresponding alcohol(s).
		Therefore, our preliminary results indicate that when comparing the toxicity of positional isomers, that is, phthalates, isophthalates, and terephthalates, of a particular alkyl group, dialkyl terephthalates are most toxic and dialkyl phthalates are least toxic, while isophthalate toxicity resides somewhere in between.
	www.csulb.edu /divisions/aa/projects/showcase/fall98/iso (1482 words)

	The World Market for Dimethyl Terephthalate: A 2004 Global Trade Perspective
		I have developed a methodology, based on macroeconomic and trade models, to estimate the market for dimethyl terephthalate for those countries serving the world market via exports or supplying from various countries via imports.
		Combined, Chapters 3 and 4 present the complete picture for imports and exports of dimethyl terephthalate to and from all major countries in the world.
		"Dimethyl Terephthalate" as a category is defined in this report following the definition given by the United Nations Statistics Division Classification Registry using the Standard International Trade Classification, Revision 3 (SITC, Rev. 3).
	www.marketresearch.com /researchindex/917520.html (567 words)

	US FDA/CFSAN: Inventory of Effective Food Contact Substance Notifications Limitations/Specifications/Use
		The finished copolymers are prepared by the condensation of dimethyl terephthalate or terephthalic acid and dimethyl-2,6-naphthalenedicarboxylate or 2,6-naphthalenedicarboxylic acid with ethylene glycol and are used as the base sheet or base polymer for manufacturing articles and films intended to contact all food types under Conditions of Use A through H as described in Table 2.
		The FCS is manufactured from ethylene glycol, dimethyl terephthalate, and isophthalate acid and the finished polymer shall contain at least 88 weight percent of polymer units derived from ethylene terephthalate and must meet specifications in 21 CFR 177.1630 appropriate to its intended use.
		The finished copolymers are prepared by the condensation of dimethyl terephthalate or terephthalic acid, dimethyl isophthalate or isophthalic acid with ethylene glycol.
	www.cfsan.fda.gov /~dms/opa-fcn2.html (16227 words)

	External Electric Field Effects on Fluorescence in an Electron Donor and Acceptor System: Ethylcarbazole and Dimethyl ...
		Fluorescence of ethylcarbazole doped in PMMA polymer films is quenched by an external electric field in the presence of dimethyl terephthalate, indicating that the rate of the intermolecular electron transfer from a photoexcited molecule of ethyl carbazole to dimethyl terephthalate is enhanced by an applied electric field.
		The free energy change of the electron transfer reaction from photoexcited ethylcarbazole to dimethyl terephthalate is estimated to be about -0.7 eV in PMMA polymer films, based on the external electric field effect on fluorescence intensity of ethylcarbazole combined with the fluorescence lifetime.
		The molecular polarizability of fluorescent exciplex formed in a mixture of ethylcarbazole and dimethyl terephthalate is also estimated, based on the Stark shift of the exciplex fluorescence.
	pubs.acs.org /cgi-bin/abstract.cgi/jpchax/1996/100/i41/abs/jp961125m.html (236 words)

	FDA > CDRH > CFR Title 21 Database Search
		Ethylene terephthalate copolymers: Prepared by the condensation of dimethyl terephthalate or terephthalic acid with ethylene glycol, modified with one or more of the following: Azelaic acid, dimethyl azelate, dimethyl sebacate, sebacic acid.
		The level of pyromellitic dianhydride shall not exceed 0.5 percent by weight of the finished copolymer which may be used under conditions of use E through H as described in table 2 of 176.170(c) of this chapter.
		Ethylene azelate-terephthalate copolymer: The copolymer, dissolved in 1,1,2-trichloroethane and/or methylene chloride, may be used as a heat-activated sealant on polyethylene terephthalate film intended for sealing polyethylene terephthalate pouches that are used as containers of either nonalcoholic beverages or alcoholic beverages containing not more than 15 percent ethyl alcohol.
	www.accessdata.fda.gov /scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=177.1630 (1798 words)

	Polyethylene Terephthalate Migration and Toxicity
		Amilar; Daiya foil; Dowlex; Ethylene terephthalate polymer; Fiber V; Hostadur; Hostaphan; Lavsan; Lawsonite; Melinex; Mersilene; Nitron lavsan; Poly(oxy-1,2-ethanediyloxycarbonyl-1,4phenylenecarbonyl); Polyethylene glycol terephthalate; Terephtahlic acid-ethylene glycol polyester.
		A polyester of terephthalic acid and ethylene glycol can be obtained by the poly= condensation of dimethyl terephthalate (q.v.) with ethylene glycol, and also terephthalic acid with ethylene glycol or ethylene oxide.
		Diethylene glycol and dimethyl terephthalate were not found in extracts.
	www.mindfully.org /Plastic/Polyethylene/Polyethylene-Terephthalate-Sheftel.htm (1375 words)

	Asia capacity and output of acrylonitrile, monoethylene glycol, purified terephthalic acid, dimethyl terephthalate and ...
		Japan output, exports and imports of acrylonitrile, monoethylene glycol, purified terephthalic acid, dimethyl terephthalate and caprolactam, reported in metric tons for 1998 and 1999
		Asia output and capacity in metric tons per year for acrylonitrile, monoethylene glocol, purified terephthalic acid, dimethyl terephthalate and caprolactum in 1999 and 2000
		US purified terephthalic acid (PTA) and dimethyl terephthalate (DMT) capacity in pounds per year by company and plant location, reported as of October 22, 2001
	www.researchandmarkets.com /reportinfo.asp?report_id=265065 (412 words)

	Polyester
		The structure in the picture is called poly(ethylene terephthalate), or PET for short, because it is made up of ethylene groups and terephthalate groups (duh!).
		I realize that terephthalate is not the kind of word most English-speaking mouths are used to saying, but with practice you should be able to say it with only a slight feeling of awkwardness when it rolls off your tongue.
		Terephthalic acid and ethylene glycol can polymerize to make PET when you heat them with an acid catalyst.
	www.pslc.ws /macrog/pet.htm (832 words)

	Inventory of Effective Premarket Notifications for Food Contact Substances - FDA - US Food and Drug Administration, ...
		Dimethyl hydroxyethyl ammonium groups are added to the polymer to provide binding sites.
		As a cross linking agent in the manufacture of poly dimethyl hydrogen methylsiloxane complying with 21 CFR 175.300 and 175.320 and intended for use: 1) as a component of food packaging articles; 2) in molds used to manufacture food-contact material; and 3) as a component of release coatings (a dehesive) for use with pressure-sensitive labels.
		Polyethylene terephthalate copolyesters (diethylene glycol-isophthalate modified) prepared by the condensation of dimethyl terephthalate or terephthalic acid and ethylene glycol with one or more of the following: dimethyl isophthalate, isophthalic acid, and diethylene glycol.
	www.mindfully.org /Food/2005/Food-Contact-Substances-FDA15feb05.htm (4124 words)

	JAIC , Volume 39, Number 3, Article 5 (pp. to )
		Dimethyl terephthalate (DMT) and ethylene glycol are the primary chemicals used to produce commercial polyester film, for example, Mylar or Melinex (polyethylene terephthalate [PET]) (fig.
		DMT can be replaced by terephthalic acid (TPA), which changes the production cycle slightly.
		The surface characteristics of the polyester film that affect its durability as a support for reprographic purposes and contribute to image quality and longevity are decided fairly early in the production cycle.
	aic.stanford.edu /jaic/articles/jaic39-03-005_3.html (1001 words)

	Polyethylene Terephthalate (PET) - Market Size, Market Share and Demand Forecast;
		Polyethylene terephthalate (PET) may be produced from ethylene glycol and either dimethyl terephthalate (DMT) or terephthalic acid (TPA).
		The extent of polymerization (apparent from the molecular weight of the polymer) is a function of the polymerization conditions and significantly affects the properties of the resin that is produced.
		Polyethylene terephthalate can be polycondensed in melt-stirred autoclaves up to an IV of 0.6; in special heavy-duty reactors, IVs of up to 0.85 can be achieved without significant thermal damage.
	nexant.ecnext.com /coms2/summary_0255-144_ITM (1524 words)

	JCE 2003 (80) 79 [Jan] Chemical Recycling of Pop Bottles: The Synthesis of Dibenzyl Terephthalate from the Plastic ...
		A laboratory procedure involving the chemical recycling of the plastic polyethylene terephthalate (PET or PETE) from 2-L pop bottles is described.
		At atmospheric pressure in refluxing benzyl alcohol in the presence of a catalyst, PET is converted to dibenzyl terephthalate in moderate yields.
		This procedure models an industrial process that involves the transesterification reaction of PET with methanol at high temperature and pressure, conditions not normally accessible in an undergraduate laboratory, to yield dimethyl terephthalate and ethylene glycol.
	jchemed.chem.wisc.edu /journal/issues/2003/Jan/abs79.html (371 words)

	Dimethyl terephthalate (DMT) (CASRN 120-61-6), IRIS, Environmental Protection Agency
		In the NCI (1979) study mice and rats (50/sex/group) were fed dimethyl terephthalate (DMT) at levels of 0, 2500, and 5000 ppm (diet) for 103 weeks.
		A small but dose-related increase in the incidence of chronic kidney inflammation was shown for male mice and female rats; the incidence for male mice was 2/49, 4/49, and 11/49, and for female rats was 3/49, 5/49, and 8/49 for the control, low-dose and high-dose groups, respectively.
		IRIS users may request the references for those studies from the IRIS Hotline at hotline.iris@epa.gov or (202)566-1676.
	www.epa.gov /iris/subst/0046.htm (879 words)

	[No title]
		Synthesis of PET Poly (ethylene terephthalate) (PET) is a member of polyesters and is synthesized by polycondensation.
		At the first reaction, terephthalic acid (TA) and ethylene glycol (EG) mix together at the [EG]/[TA] ratio ranges from 1.3 to 1.5, and the reaction starts from 230-260°C plus vacuum between 0.3MPa and 0.5MPa without the use of catalyst because carboxylic groups of TA are reactive and catalytic.
		Conclusion PET is a linear polymer that synthesizes by either terephthalic acid (TA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) under polycondensation.
	filebox.vt.edu /users/yecheung/MSE4554final.doc (2085 words)

	US purified terephthalic acid ( PTA ) and dimethyl terephthalate ( DMT ) capacity in pounds per year by company and ...
		US purified terephthalic acid (PTA) and dimethyl terephthalate (DMT) capacity in pounds per year by company and plant location, reported as of October 22, 2001 - Research and Markets - Market Research Reports
		Database Table Name: US purified terephthalic acid (PTA) and dimethyl terephthalate (DMT) capacity in pounds per year by company and plant location, reported as of October 22, 2001
		Asia capacity and output of acrylonitrile, monoethylene glycol, purified terephthalic acid, dimethyl terephthalate and caprolactam, reported in metric tons for 1998 and 1999
	www.researchandmarkets.com /reportinfo.asp?report_id=279281 (393 words)

	MJ Barandiaran Papers
		M.J. ASUA "Kinetic Analysis of the Transesterification of Dimethyl Terephtalate with Ethylen Glycol in a Semibatch Reactor".
		M.J. ASUA "Study of the Significance of Oligomerization in the Reaction of Dimethyl Terephthalate with Ethylene Glycol by using Methanol Data" POLYMER 31, 1347 (1990).
		M.J. ASUA "Analysis of the Oligomerization in the Reaction of Dimethyl Terephthalate with Ethylene Glycol".
	www.sc.ehu.es /scrwwwqp2/Papers/Mariajepapers.htm (449 words)

	Dimethyl Terephthalate (US Gulf) Price Report - Chemical pricing information - ICIS Pricing
		Any distribution or forwarding of information which is not expressly permitted by your subscription agreement is a copyright violation.
		The dimethyl terephthalate (DMT) market has remained very quiet this week, as several players are yet to return from holiday.
		Downstream, polyethylene terephthalate (PET) producers hope to raise prices in January, but there are currently no clear indications as talks are yet to begin in most cases.
	www.icispricing.com /il_shared/Samples/Subpage106.asp (373 words)

	Significance of Report of Carcinogenic Activity of Dimethyl Terephthalate
		I have not obtained information on the possible industrial exposure from dimethyl terephthalate.
		This report indicates that the terephthalic acid was identified only by comparative RF values.
		Based on the fact that terephthalic acid has not been reported in our laboratory, it seems highly likely ~hat terephthalic acid is not a constituentof cigarette smoke.
	tobaccodocuments.org /tplp/500873262.html (389 words)

	New Page 2
		PCT is a polyester fiber made with unique chemistry.
		Combining dimethyl terephthalate (DMT or terephthalic acid (TA) with ethylene glycol (EG) produces conventional polyester (PET).
		By substituting 1,4-cyclohexane dimethanol (CHDM) for the EG, a fiber can be produced with properties better suited to fulfill the needs of many applications.
	www.fitfibers.com /PCT_fibers.htm (125 words)

	Polyester - Background, History, Raw Materials, The Manufacturing, Manufacturing Filament Yarn
		Today, there are two primary types of polyester, PET (polyethylene terephthalate) and PCDT (poly-1, 4-cyclohexylene-dimethylene terephthalate).
		1 To form polyester, dimethyl terephthalate is first reacted with ethylene glycol in the presence of a catalyst at a temperature of 302-410°F (150-210°C).
		2 The resulting chemical, a monomer (single, non-repeating molecule) alcohol, is combined with terephthalic acid and raised to a temperature of 472°F (280°C).
	www.madehow.com /Volume-2/Polyester.html (1324 words)

	Poly(Trimethylene Terephthalate): A "New" Type of Polyester Fiber by Houck, Huff, Lowe, and Menold (Forensic ...
		Poly(trimethylene terephthalate) (PTT) was first synthesized and patented in 1941 (Whinfield and Dickson 1941), but it was not produced commercially because of the expense of one of the precursors, 1, 3-propanediol (PDO; Chuah et al.1995A).
		PTT is synthesized by the polycondensation of trimethylene glycol with either a terephthalic acid or dimethyl terephthalate.
		PTT has an odd number (three) of methylene units between each of the terephthalates, whereas PBT and PET have even numbers of methylene units.
	www.fbi.gov /hq/lab/fsc/backissu/july2001/houck.htm (1186 words)

	CMAI Completes 2006 World Terephthalates & Polyester Analysis
		The major polyester products covered include terephthalic acid (TPA) and dimethyl terephthalate (DMT), polyester polycondensation, staple and filament, bottle resin, polyester film, polytrimethylene terephthalate, polybutylene terephthalate as well as other terephthalate derivatives.
		Demand in Asia is growing faster than in other regions, and will result in market share rising to 26 percent in 2005.
		CMAI's 2006 World Terephthalates & Polyester Analysis is available in book and CD-ROM format and also includes technology analysis, trade, price forecasts as well as other pertinent issues in relation to the polyester industry.
	www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/08-31-2005/0004097417&EDATE= (568 words)

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