Short chain aliphatic diols

Thermoplastic copolyester elastomers are generally block copolymers produced from short-chain aliphatic diols, aromatic diacids, and polyalkylene ether-diols. They are often called polyesterether or polyester elastomers. The most significant commercial product is the copolymer from butane-1,4-diol, dimethyl terephthalate, and polytetramethylene ether glycol [25190-06-1/, which produces a segmented block copolyesterether with the following structure. 

Chem. Descrip. Sat., aliphatic, linear, hydroxyl-terminated polyester diol based on short chain glycols and polyester Uses Polyester for sol n. coatings and adhesives, thermoplastic elastomers, and castable prepolymers... 

TEEEs are typically produced by condensation polymerization of an aromatic dicarboxylic acid or ester with a low MW aliphatic diol and a polyalkylene ether glycol. Reaction of the first two components leads to the hard segment, and the soft segment is the product of the diacid or diester with a long-chain glycol. This can be described as a melt transesterification of an aromatic dicarboxylic acid, or preferably its dimethyl ester, with a low MW poly(alklylene glycol ether) plus a short-chain diol. ... 

Polyester urethanes are synthesized from aliphatic polyesters. In order to be biodegradable, aliphatic polyesters have to he formed by macrodiols of succinic acid, adipic acid, sebacic acid and ethylene glycol, diethylene glycol, butanediol and/or hexanediol [953]. It is difficult to cleave phthalic acid polyesters, dodecanoic acid with short-chain diols, and polyesters of short-chain acids with long-chain diols, such dodecanediol. Table 5.137 [953]. 

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