Polyester Nature of polyester polyester Acid value Mean M. wt. N* ηint (dL g-1)
I Viscous material 12.5 7392 16 0.54
II Viscous material 25.0 4872 12 0.73
III Viscous material 21.0 7773 15 0.36
IV Viscous material 19.5 7552 9 0.47
N* = Degree of polymerization Table 1: Physical properties of saturated polyester.