Patent ID: 7917308

Claim:
Process for determining a molecular weight distribution in a polymer, comprising measuring a complex shear modulus as a function of the frequency, fitting an analytical function to the measured complex shear modulus or to a mastercurve determined from the measured complex shear modulus, and calculating the molecular weight distribution therefrom, wherein a sum of at least three Cole-Cole functions according to F CCV * ⁡ ( f ) = ∑ v = 0 4 n ⁢ F 0 v ⁢ ι ⁢ f f 0 v 1 + ι ⁢ f f 0 v is selected as the analytical function, wherein the width parameter selected in the Cole-Cole functions is b=0.5, wherein the relaxation time spectrum is calculated proceeding therefrom, where the parameters F 0 ν and f 0 ν are selected so as to give rise to the sum of the Cole-Cole functions in log-log plot, wherein the real part has the slope of 2 in the limiting case of small frequencies and an imaginary part has the slope of 1 in the limiting case of small frequencies.