This category consists of saturated and unsaturated polymers containing ester functionality in the main polymer chain. Natural oils are commonly used to make unsaturated polyesters. These materials, such as poly(ethylene terephthalate) (PET), find wide use as fibers, films, and engineering plastics. Some of the polyesters are readily biodegradable (see the Biodegradable Polymers section).

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181501 Poly(1,4-butylene adipate) average Mw ~12,000 by GPC
448028 Poly(1,4-butylene succinate), extended with 1,6-diisocyanatohexane
190942 Poly(1,4-butylene terephthalate) average Mv ~38,000, pellets
430560 Poly[butylene terephthalate-co-poly(alkylene glycol) terephthalate] melt index 12.5 g/10 min (240 °C/2.16kg)
181757 Poly(diallyl isophthalate) average Mw ~500,000, average Mn ~30,000, powder
458392 Poly[di(ethylene glycol) adipate] average Mn ~2,500
458406 Poly[di(ethylene glycol)/trimethylolpropane-alt-adipic acid], polyol average Mn ~2,300
191019   Poly(dimer acid-co-alkyl polyamine) softening point 95 °C (ring and ball)
191035   Poly(dimer acid-co-alkyl polyamine) softening point 130 °C (ring and ball)
191043   Poly(dimer acid-co-alkyl polyamine) softening point 140 °C (ring and ball)
181919 Poly(ethylene adipate) average Mw ~10,000 by GPC
456594 Poly(ethylene azelate) average Mw ~55,500, average Mn ~29,000
182036 Poly(ethylene succinate) average Mw 10,000
429252 Poly(ethylene terephthalate) granular
458422 Poly(1,6-hexanediol/neopentyl glycol-alt-adipic acid) average Mn ~900
456586 Poly(1,3-propylene adipate) average Mw ~5,700, average Mn ~4,800
456551 Poly(1,3-propylene succinate) average Mw ~9,500 by GPC
458147 Poly[trimethylolpropane/di(propylene glycol)-alt-adipic acid/phthalic anhydride], polyol average Mn ~500