Alkylene isophthalate

Alkylene Isophthalate/PTME Isophthalate Copolymers. Polyether-ester copolymers having the compositions 50% alkylene isophthalate/ PTME isophthalate were prepared using as diols ethylene glycol (2G),... 

Poly(alkylene phthalate)s and Poly(alkylene isophthalate)s... 

Further studies of equilibration reactions of aliphatic polyesters in solution catalyzed by titanium alkoxides were contributed by BiUmeyer et al. [16-18]. Semiyen et al. [19] used a dibutyltin salt for the preparation of cyclic oligomers by depolymerization of poly(tetraethyleneglycol succinate). Extraction and characterization of cyclic oligo(alkylene isophthalate)s and oligo(alkylene terephthalate)s [20-24] beg an in 1954 with the work of Ross et al. [20], who isolated the cyclic trimer from PET. A detailed study of 13 different polyesters was reported by Wick and Zeigler [25]. Semiyen et al. [26] were particularly interested in the depolymerisation of polyesters derived from tetra(ethyleneglycol) and phthalic, isophthalic and terephthalic acidacid, whereas Montaudo et al. [27] studied other polyesters of terephthalic acid. 

ISOPHTHALIC ACID (88-99-3) CgH O C4H4(COOH)j Combustible solid.Dust may form explosive mixture with air (flash point 334°F/168°C Fire Rating 1). Violent reaction with nitric acid forms explosive nitro materials in the presence of sulfuric acid. Dust and powder forms explosive mixture with air. Incompatible with strong acids, alkalis, aliphatic amines, alkanolamines, alkylene oxides, ammonia, epichlorohydrin, isocyanates, nitrates, nitromethane, sodium nitrite, strong oxidizers. On small fires, use dry chemical powder (such as Piuple-K-Powder), Halon , alcohol-resistant foam, water spray, or CO2 extinguishers. Coihbustion produces phthalic anhydride and carbon oxides. 

ISOPHTHALIC ACID (88-99-3) Combustible solid (flash point 334°F/168°C). Dust and powder forms explosive mixture with air. Incompatible with strong acids, alkalis, aliphatic amines, alkanolamines, alkylene oxides, ammonia, epichlorohydrin, isocyanates, nitrates, nitric acid, nitromethane, strong oxidizers, sodium nitrite. 

Polyester can be recovered from contaminated polyester waste which contains nonpolyester components.The waste may be polyester blended with cotton or other fibers, polyester magnetic tapes, or coated polyester films and engineering resins. The waste is dissolved in dimethyl terephthalate, methyl-p-toluate or dimethyl isophthalate. The contaminants are filtered from solution and polyester is recovered by crystallization or used as a feedstock in a methanolysis process which forms dimethyl terephthalate and alkylene glycol. 

In addition to PBT [1,2,4,5,18,19,66,67], poly(butylene terephthalate-C(> isophthalate) [68-70], PBT copolymers with unsaturated alkylene dicarbox-ylates or unsaturated glycols [20,71-74], poly(ethylene terephthalate) (PET)... 

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