Ethylene terephthalate/PTME

Ethylene Terephthalate/PTME Terephtalate Copolymer. The ethylene glycol- or 2G-based copolymer (Table II) closely resembles the 4G-based copolymer in having a high melting point, even higher than the 4G copolymer, and excellent tensile and tear strengths. The 2G-based copolymer suffers from having a rather slow rate of crystallization (8,12). Poly (ethylene terephthalate) homopolymer suffers from similar... 

Fifty percent 1,4-cyclohexanedimethylene isophthalate/PTME isophthalate copolymers prepared from practical-grade 1,4-cyclohexanedimeth-anol and from trans- 1,4-cyclohexanedimethanol also harden slowly over a period of hours. No attempts were made to speed the rate of crystallization of these copolymers by addition of nucleating agents although it has been demonstrated that the rate of crystallization of ethylene terephthalate/PTME terephthalate copolymers, which also crystallize slowly, can be increased by nucleation. 

Alkylene 2,6-Naphthalenedicarboxylate/PTME 2,6-Naphthalene-dicarboxylate Copolymers. Fifty percent alkylene 2,6-naphthalenedicar-boxylate/PTME 2,6-naphthalenedicarboxylate copolymers were prepared using each of the straight-chain, hydroxy-terminated diols from ethylene glycol (2G) to 1,10-decanediol (10G) (Table VIII). In contrast to many of the 50% alkylene terephthalate/PTME terephthalate copolymers of Table II, all of the 2,6-naphthalenedicarboxylate-based copolymers tested exhibit excellent tensile strength and tear strength regardless of the diol used or the melting point of the copolymer. As a consequence of their excellent properties, the 2,6-naphthalenedicarboxylate copolymers have been the subject of several patents (32,33,34). 

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