Dibutyl terephthalate

Terephthalate esters are not as compatible as phthalates with PVC and are more difficult to process. Today there is essentially only one important terephthalate plasticizer commercially available, DEHTP, as terephthalate esters of C9 and CIO alcohols have compatibility issues. The diisoheptyl terephthalate ester was shown [27] to have advantages in processabihty and plasticizing efficiency over DEHTP, but with hmited availability of isoheptanol, this product was never commercialized. The terephthalate ester based on C4 alcohols, dibutyl terephthalate (DBTP) is now commercially available for use in plasticizer blends to help improve processability [28] of DEHTP. Although DEHTP is very similar to the structure of DEHP, the structural difference yields important effects in the plasticizer toxicity profile. Extensive testing of DEHTP confirms that it is a safer product than DEHP [24]. 

In addition to these major market segments, plasticizers are used in a variety of smaller segments. Adhesives and sealants generally use lower molecular weight phthalate esters, benzoate esters and diesters, and dibutyl terephthalate because of improved solvency and lower fusion temperatures. One major use of plasticized PVC is automotive underbody coatings these products are highly filled plastisols that are mostly commonly based upon GP plasticizers often with a fast fusing plasticizer added to improve processability however, plasticizer volatility can be a major concern. 

Polyvinyl acetate (PVAc) emulsion polymers are used for adhesives, sealants, and paints. PVAc homopolymer is too brittle for most end uses, so much of fte PVAc used in the paint industry is internally plasticized through the incorporation of comonomers into the polymer backbone. However, there are some uses of externally plasticized PVAc in adhesives. The most common plasticizers used with adhesives are a variety of benzoate esters, although dibutyl terephthalate is now being promoted for this application. 

Dimethyl phthalate Diethyl phthalate Dipropyl phthalate Diisopropyl phthalate Dibutyl phthalate Diethyl isophthalate Dimethyl isophthalate Diethyl terephthalate Dimethyl terephthalate... 

Transesterification reactions between poly(ethylene terephthalate) PET, and acetoxybenzoic acid (ABA) were conducted using the melt polymerization technique to understand the transesterification kinetics of a phase segregated system. The transesterification kinetics of two compositions PET 20 / 80 (ABA) and PETIO / 90 (ABA) have been studied at 260, 275, 290 and 305°C using dibutyl tinoxide (0.1 mole percent) as a catalyst. Homopolymerization of acetoxy benzoic acid was also studied at similar temperatures and catalyst concentration. 

Vestinol AH Food, Vestinol AH MED, Vestinol AH. See s-Dioctyl phthalate Vestinol C. See Dibutyl phthalate Vestinol IB. See Diisobutyl phthalate Vestinol OA. See Dioctyl adipate Vestoduf Series. See Polybutylene terephthalate... 

Neopentyl glycol Pentaerythrityl triallyl ether Terephthalic acid Tripropylene glycol comonomer, unsaturated polyesters Dipropylene glycol comonomer, vinyl acetate Bis (2-ethylhexyl) maleate Diisooctyl maleate comonomer, vinyl emulsion polymers Bis (2-ethylhexyl) maleate comonomer, vinyl resins Dibutyl fumarate Dibutyl maleate comonomer, vinyl/acrylic resins Benzyl methacrylate... 

Barium sulfate Benzyl acetate Cellulose acetate propionate Dextrin Dibutyl phthalate Dimethyl terephthalate Elemi gum Ethylene/MA copolymer Fumaric acid Humic acid... 

Dibutyl maleate Dicyclohexyl phthalate Diisobutyl adipate Diisobutyl phthalate Dioctyl terephthalate chlorinated Ethyl toluenesulfonamide Isodecyl benzoate Methyl ricinoleate Paraffin, chlorinated PEG-4 di-2-ethylhexoate Sucrose acetate isobutyrate Sucrose benzoate p-Toluene ethylsulfonamide o-Toluenesulfonamide Trixylenyl phosphate plasticizer, PVAc adhesives Dipropylene glycol dibenzoate PEG-4 dibenzoate... 

Dibutoxyethyl azelate Dibutyl adipate Diisobutyl adipate Diisodecyl glutarate Diisooctyl dodecanedioate Dioctyl dodecanedioate Dioctyl terephthalate chlorinated Dipropylene glycol dibenzoate Methyl tallate Sucrose benzoate Trimethylolethane tricaprylate-caprate Trimethylolpropane triheptanoate plasticizer, vinyl... 

The PTT is aromatic polyester prepared by the melt polycondensation of 1,3-propanediol (1,3-PDO) with either TPA or dimethyl terephthalate (DMT). The PTT is synthesized by the transesterification of propanediol with dimethylene terephthalate or by the esterification of propane diol with TPA. The reaction is carried out in the presence of hot catalyst like titanimn butoxide (Ti(OBu) ) and dibutyl tin oxide (DBTO) at a temperature of 260°C. The important by-products of this reaction include acrolien and allyl alcohol (Chuah, 2001). Direct esterification of propane diol and TPA is considered as the least economic and industrial method. The reaction is carried out in the presence of a heel imder a pressure of 70-150 kPa at a temperature of 260°C. The heel is usually referred to the added PTT oligomers which act as a reaction mediiun and increase the solubility of TPA (Chuah, 2001). Recent studies by different groups show that the selection of the catalyst plays a major role on the reaction rate and PTT properties. Commonly used catalysts like titanium (Doerr et al., 1994), tin (Kurian and Liang, 2001 Fritz et al., 1969) and antimony (Karayannidis et al., 2003 Fitz et al., 2000) compounds have their own limitations. Titanimn-based catalysts are active but the PTT is discolored, antimony-based catalysts are toxic and only active in polycondensation while tin-based compounds have lower catalytic activity. Karayannidis and co-workers (2003) reported the use of stannous oetoate ([CHj(CH2)3CH(C2Hj)COO]jSn) as the catalyst for PTT synthesis but its catalytic activity is poor, resulting in a low molecular weight PTT which was confirmed... 

Poly(ethylene terephthalate) is most usually encountered in the crystalline form and, as such, it is soluble at normal temperatures only in proton donors which are capable of interaction with the ester group. Effective solvents of this kind are chlorinated and fluorinated acetic acids, phenols and anhydrous hydrofluoric acid. The polymer is soluble at elevated temperatures in various organic liquids, which include anisole, aromatic ketones, dibutyl phthalate and dimethyl sulphone. Chloroform has the peculiar property of dissolving amorphous poly(ethylene terephthalate) at temperatures below 0°C,but on warming such solutions the polymer separates in crystalline form. Chloroform is without effect on polymer which has already been crystallized. 

C16H21IO4 2-iodo-terephthalic acid dibutyl ester 5013-49-0... 

ColtelliMB BS, Aglietto M. Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesteiification with dibutyl maleate functionalized polyolefins. Polymer 2007 48 1276-1286. 

Coltelli MB, Aglietto M, Ciardelli E. Influence of the transesterification catalyst structure on the reactive compatibilization and properties of poly(ethylene terephthalate) (PET)/dibutyl succinate functionalized poly(ethylene) blends. Eur Polym J 2008 44 1512-1524. 

CPET Crystallizable poly(ethylene terephthalate) DBF Dibutyl fumarate... 

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