abstract |
Copolyethylene terephthalate containing from 10 to 25 % by weight of the resin of units deriving from isophthalic acid, having intrinsic viscosity higher than 0.85 dl/g, melting point lower than 220 °C and crystallization properties such as to solidify from the melt to the amorphous form also by low cooling rate (1 °C/min). |