USA Process for ambient temperature grinding of ...
Soft and tacky polymers can be ground at ambient temperature in the presence of a grinding aid in an atttrition mill having counterrotating grinding elements operated above a minimum tip speed (170 m/sec) and at a throughput of more than about 90 kg/hr, the amount of grinding aid, which can be either organic or inorganic such as calcium carbonate, being about 520% based on the weight of polymer.