Polyester pellets

Polyester pellets made of a polyester which comprises dicarboxylic acid constituent units derived from dicarboxylic acids containing terephthalic acid and isophthalic acid and diol constituent units derived from diols containing ethylene glycol and 1,3-bis(2-hydroxyethoxy)benzene, and which has the following properties:

• constituent units derived from terephthalic acid are 50 to 99% by mol and constituent units derived from isophthalic acid are 1 to 50% by mol, both based on the total amount of dicarboxylic acid constituent units (i),
• constituent units derived from ethylene glycol are 25 to 99.5% by mol and constituent units derived from 1,3-bis(2-hydroxyethoxy)benzene 0.5 to 75% by mol, both based on the total amount of diol constituent units (ii),
• the intrinsic viscosity is in the range of 0.5 to 1.5 dl/g, and
• the melting point (Tm (° C.)), as measured by a differential scanning calorimeter, satisfies the following formula (I):
• [1/527−0.0017·ln(1−(mI+mB)/200)]−1−273<Tm≦265 (I)
• wherein mI is a proportion (% by mol) of the constituent units derived from isophthalic acid to all of the dicarboxylic acid constituent units, and mB is a proportion (% by mol) of the constituent units derived from 1,3-bis(2-hydroxyethoxy)benzene to all of the diol constituent units;
• said polyester pellets having a density of not less than 1,350 kg/m3.