Patent ID: 7566571

Claim:
In a solution polymerization process the improvement of detecting the increase in the content of gels having a particle size from 400 nanometers to 400 microns in the solution at one or more locations comprising the steps of: (i) at an initial time T 1 acquiring an infrared, near infrared or a Raman transmittance or diffuse reflectance spectrum within a wavelength range from 400 to 2,500 nanometers of the solution at said one or more locations; (ii) at one or more subsequent times T j wherein j is one or more times after T 1 acquiring one or more further infrared, near infrared or Raman transmittance or diffuse spectra within a wavelength range from 400 to 2,500 nanometers of the solution at said one or more locations; (iii) using a mathematical method selected from the group consisting of applying a high pass digital filter to the spectrum taken at T j or subtracting the Exponential Moving average (EMA) from the spectrum taken at T j and integrating the resulting spectrum to quantify the noise level; and (iv) following the general tendency of the noise level over time.