| abstract |
A process for the manufacture of a polymer having at least one property P with a desired value D, the process being controlled by periodically sampling the polymer produced, or being produced by the process, determining the value of the property P by applying a correlation relationship with n results R i of n absorbance measurements obtained by analysing the sample with an infrared spectrometer at n wavelengths in the near infrared region and then using the difference between the determined value of the property P and the desired value D to control the process parameters using a process computer. |